CN109870734A - Three-component gravity gradient field, three-component magnetic gradient field acquisition device and method - Google Patents
Three-component gravity gradient field, three-component magnetic gradient field acquisition device and method Download PDFInfo
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Abstract
The invention discloses a kind of three-component gravity gradient field, three-component magnetic gradient field acquisition device and methods, it is related to technical field of geophysical exploration, device includes: the first acquisition unit and the second acquisition unit for being spaced pre-determined distance, it respectively include: three-component gravity acquisition device, three-component magnetic field acquisition device, three-component Posture acquisition device；Three-component magnetic field data etc. of three-component gravity gradient field and three-component magnetic gradient field computation unit, three-component gravimetric data, the acquisition of three-component magnetic field acquisition device based on the acquisition of three-component gravity acquisition device obtains two horizontal gradient components of two horizontal gradient components of downhole gravity vertical gradient component and/or downhole gravity horizontal gradient field, underground magnetic force vertical gradient component and/or underground magnetic force level gradient fields.The application can carry out the measurement of three-component gravity and three-component magnetic field on well water level land or vertically, and then further calculate gravity gradient field and magnetic gradient field horizontally or vertically.
Description
Technical field
The present invention relates to technical field of geophysical exploration, in particular to a kind of three-component gravity gradient field, three-component magnetic
Force gradient field acquisition device and method.
Background technique
Borehole gravimetry refers to carries out gravity measurement in drilling well, vertical shaft, and the weight carried out in the tunnel in mining area
Power measurement.Gravity measurement in drilling well and vertical shaft mainly studies gravity vertical component with the variation of depth, which is by ground
Caused by the variation of lower density heterogeneous body.Gravity measurement principle in tunnel is similar with ground gravity survey, it is possible to provide
The information of tunnel lateral density variation nearby.When carrying out Subsurface Gravity measurement in larger-size vertical shaft or tunnel, it can adopt
With conventional ground gravity instrument；And the Subsurface Gravity measurement in drilling well must then use borehole gravimeter.It is limited to the diameter of wellhole
And environmental condition, it is desirable that drilling well gravimeter have diameter it is small, the variation of higher temperature and pressure can be born, and adapt to
Plumb line measures under conditions of having certain deviate.
There are mainly of two types for borehole gravimeter: a kind of design principle is identical as land gravimeter, fills after reducing repacking
On gimbal, instrument outer diameter is from 100mm~150mm etc., and 100 DEG C~200 DEG C of thermostat temperature, instrumental sensitivity 0.03~
0.05 gravitational unit, 0.1 gravitational unit of measurement accuracy when hole deviation is no more than 14 °, can still keep horizontal.Another kind is vibratory string well
Middle gravimeter, this kind of nearly 0.1 gravitational unit of Instrument measuring precision.Such as ESS0 type vibrating string gravimeter, in actual operation, each survey
Point 4 numbers of reading, about 20 minutes required total times, outer diameter 102mm, thermostat temperature are maintained at 125 DEG C.Borehole gravimeter Xiang Quan
Automatic reading direction is developed, and leveling, orientation, opening and closing and reading of the sensitive system in well are all controlled by microcomputer.Borehole gravimeter
The apparent density precision of measured rock stratum reaches 0.01g/cm3, porosity precision up to 0.5%, have been widely used metallic ore with
In the exploration and development of oil gas field.Borehloe gravimetry system generally comprises ground instrument and well Instrumental two parts.Ground instrument
Device is mainly control system and the capstan winch that can accurately control depth of falling well, is limited by use environment smaller.And well Instrumental
Working environment it is extremely complex, the performance of borehole gravimeter will meet the harsh demand of the factors such as well temperature, well pressure, hole diameter, hole deviation,
In addition time of measuring is because directly affect the important indicator that efficiency is also borehole gravimeter.The development of borehole gravimeter will lag behind
Ground gravity instrument.
Three-component magnetometer is the geology for three, borehole measurement earth's magnetic field orthogonal vector along borehole axis change in depth in well
Instrument can obtain the information that ground instrument can not detect due to being deep into underground survey magnetic field, solve more hidden geology
Problem.Three-component magnetometer is primarily used to the magnetic ore body that verifying ground magnetic field is abnormal, by discovery drilling hole with bottom hole at present.
So-called three-component refers to two geomagnetic field components X, Y and a vertical component Z in different depth point upper horizontal plane.Generally adopt
This measurement space coordinates is determined with gravity direction and the inclined direction of drilling.But current existing three-component magnetometer is
Magneto sensor is mounted on movable frame, after inserting tube inclination, under the effect of gravity, measurement system is kept by mechanical system
The coordinate system of system causes measurement inaccuracy.And structure is complicated, reliability is low for three-component magnetometer, and it is fixed can only to carry out underground
Site is surveyed.
Summary of the invention
In order to overcome the drawbacks described above of the prior art, the technical problem to be solved is that provide one kind for the embodiment of the present invention
Three-component gravity gradient field, three-component magnetic gradient field acquisition device and method are able to solve currently in use in the world at present
The deficiency of magnetometer in a few money borehole gravimeters and well, can be in drilling well, vertical shaft, inclined shaft, the tunnel in mining area or horizontal well water
Level land or the measurement for vertically carrying out three-component borehole gravity and magnetic field, and then further obtain gravity horizontally or vertically
Gradient fields value and magnetic gradient field value.
The specific technical solution of the embodiment of the present invention is:
A kind of three-component gravity gradient field, three-component magnetic gradient field acquisition device, three-component gravity gradient field, three
Component magnetic gradient field acquisition device includes:
It is spaced the first acquisition unit and the second acquisition unit of pre-determined distance, first acquisition unit and described second is adopted
Collect unit includes: three-component gravity acquisition device, three-component magnetic field acquisition device, three-component Posture acquisition device respectively；
With in first acquisition unit and second acquisition unit the three-component gravity acquisition device, described three
The three-component gravity gradient field and three-component that component magnetic field acquisition device and the three-component Posture acquisition device are mutually electrically connected
Magnetic gradient field computation unit, three-component gravity gradient field and three-component magnetic gradient field computation unit are based on described first
The three-component gravimetric data, described of three-component gravity acquisition device acquisition in acquisition unit and second acquisition unit
The three-component magnetic field data of three-component magnetic field acquisition device acquisition and the three-component appearance of three-component Posture acquisition device acquisition
State and displacement data obtain two horizontal gradients point of downhole gravity vertical gradient component and/or downhole gravity horizontal gradient field
Two horizontal gradient components of amount, underground magnetic force vertical gradient component and/or underground magnetic force level gradient fields.
Preferably, the three-component gravity acquisition device includes the X for measuring the acceleration of gravity of gravity along the x axis
Axis gravity sensitive unit, the Y-axis gravity sensitive unit for measuring the acceleration of gravity of gravity along the y axis and for measure weight
Z axis gravity sensitive unit of the power along the acceleration of gravity of Z-direction；
The X-axis gravity sensitive unit, the Y-axis gravity sensitive unit, the Z axis gravity sensitive unit be along three axis just
Hand over the MEMS type laid or cold atom type gravity sensitive unit；
Three-component magnetic field acquisition device includes for measuring the X-axis magnetic field sensing cell of magnetic field value along the x axis, using
In the measurement Y-axis magnetic field sensing cell of magnetic field value and for measuring the Z axis magnetic field sensing along Z-direction magnetic field value along the y axis
Unit；
The X-axis magnetic force sensing unit, the Y-axis magnetic force sensing unit, the Z axis magnetic force sensing unit be along three axis just
Hand over the flux gate type laid or cold atom type magnetic field sensing cell；
The three-component Posture acquisition device includes that the X-axis posture sensing of the posture and displacement for measuring X-direction is single
Member, the posture for measuring Y direction and the Y-axis posture sensing unit of displacement and posture and displacement for measuring Z-direction
Z axis posture sensing unit；
Three-component gravity gradient field, three-component magnetic gradient field acquisition device further include: be connected to described first and adopt
Collect amplifier, analog-to-digital conversion and the data storage cell between unit and second acquisition unit, the amplifier, modulus turn
It changes and is connected with data storage cell with three-component gravity gradient field and three-component magnetic gradient field computation unit, it is described to put
Big device, analog-to-digital conversion and data storage cell are used for the simulation exported to first acquisition unit and second acquisition unit
Signal amplifies, analog-to-digital conversion and data store, and the amplifier, analog-to-digital conversion and data storage cell can be to no less than 18
The signal in channel amplifies and 32 analog-to-digital conversions.
Preferably, the three-component gravity acquisition device further includes the first pedestal, is fixedly mounted in first pedestal
First fixing body in portion, the first shell being set in outside first fixing body, first shell and first pedestal it
Between be threadedly coupled, first fixing body at least has there are three side, the X-axis gravity sensitive unit, the Y-axis gravity sensitive
Unit and the Z axis gravity sensitive unit are separately mounted on three sides of first fixing body, the X-axis gravity sensitive
It is mutually orthogonal two-by-two between unit, the Y-axis gravity sensitive unit and the Z axis gravity sensitive unit.
Preferably, three-component magnetic field acquisition device further includes the second pedestal, is fixedly mounted in the middle part of the second pedestal
Second fixing body, the second housing being set in outside second fixing body, spiral shell between the second housing and second pedestal
Line connection, second fixing body at least have there are three side, the X-axis magnetic field sensing cell, the Y-axis magnetic field sensing cell
It is separately mounted on three sides of second fixing body with the Z axis magnetic field sensing cell, the X-axis magnetic field sensing list
It is mutually orthogonal two-by-two between first, the described Y-axis magnetic field sensing cell and the Z axis magnetic field sensing cell.
Preferably, the three-component Posture acquisition device further includes third pedestal, is fixedly mounted in the middle part of third pedestal
Third fixing body, the third shell being set in outside the third fixing body, spiral shell between the third shell and the third pedestal
Line connection, the third fixing body at least have there are three side, the X-axis posture sensing unit, the Y-axis posture sensing unit
It is separately mounted on three sides of the third fixing body with the Z axis posture sensing unit, the X-axis posture sensing is single
It is mutually orthogonal two-by-two between first, the described Y-axis posture sensing unit and the Z axis posture sensing unit.
Preferably, the three-component gravity acquisition device, three-component magnetic field acquisition device and the three-component posture
Acquisition device is connected along a straight line, three-component gravity gradient field, three-component magnetic gradient field acquisition device upper end connect
It is connected to armored cable, the armored cable instructs with transfer operation and transmit data for being connected with surface laboratory.
Preferably, three-component gravity gradient field and three-component magnetic gradient field computation unit include: correction unit, institute
State underground three-component gravimetric data, the three-component magnetic field that correction unit is used to acquire the three-component gravity acquisition device
The underground three-component magnetic field data of acquisition device acquisition carries out rotation correction in conjunction with the three-component posture and displacement data, to turn
Change the three-component gravimetric data and three-component magnetic field data of the same orientation at different depth position into；
Gravity gradient field acquisition device, gravity gradient field acquisition device are used for the phase at the different depth position
Three-component gravimetric data with orientation is counted according to the horizontal or vertical component difference of gravity between two o'clock divided by the distance between two o'clock
The horizontal or vertical gradient value of downhole gravity is calculated, and then obtains underground according to all horizontal or vertical gradient values of downhole gravity
Vertical gradient of gravity field and/or downhole gravity horizontal gradient field；
Magnetic gradient field acquisition device, magnetic gradient field acquisition device are used for the phase at the different depth position
With orientation three-component magnetic field data according to the horizontal or vertical component difference in magnetic field between two o'clock divided by vertical between two o'clock or
Horizontal distance calculates the horizontal or vertical gradient value in underground magnetic field, and then according to all horizontal or vertical gradients in underground magnetic field
Value obtains two horizontal gradient components of underground magnetic force vertical gradient component and/or underground magnetic force level gradient fields.
It is a kind of using any of the above-described three-component gravity gradient field, three points of three-component magnetic gradient field acquisition device
Gravity gradient field, three-component magnetic gradient field acquisition methods are measured, three-component gravity gradient field, three-component magnetic gradient field are obtained
Take method the following steps are included:
By three-component gravity gradient field, three-component magnetic gradient field acquisition device in well section to be measured according to preset point away from rule
Then three-component gravimetric data, three-component magnetic field data and three-component posture and displacement data in point-by-point production wells；
The three-component gravimetric data of three-component gravity acquisition device acquisition, three-component magnetic field acquisition device are adopted
The three-component magnetic field data of collection carries out rotation correction in conjunction with the three-component posture and displacement data, to be converted into different depth
The three-component gravimetric data and three-component magnetic field data of same orientation at position；
The three-component gravimetric data of same orientation at the different depth position is vertical according to the gravity between two o'clock
Or horizontal component difference calculates the horizontal or vertical gradient value of downhole gravity, Jin Ergen divided by the horizontal or vertical distance between two o'clock
Downhole gravity vertical gradient component and/or downhole gravity water is calculated according to all horizontal or vertical gradient values of downhole gravity
Two horizontal gradient components of flat gradient fields；
The three-component magnetic field data of same orientation at the different depth position is vertical according to the magnetic field between two o'clock
Or horizontal component difference calculates the horizontal or vertical gradient value in underground magnetic field, Jin Ergen divided by the horizontal or vertical distance between two o'clock
Underground magnetic field vertical gradient component and/or underground magnetic field water is calculated according to all horizontal or vertical gradient values in underground magnetic field
Two horizontal gradient components of flat gradient fields.
Preferably, the three-component gravimetric data that acquires the three-component gravity acquisition device in step, the three-component
The three-component magnetic field data of magnetic field acquisition device acquisition carries out rotation correction in conjunction with the three-component posture and displacement data, with
It is converted into the three-component gravimetric data and three-component magnetic field data of the same orientation at different depth position, specifically: according to
Inclination angle, azimuth and tendency calculate the vertical component parameter and/or level of gravity and magnetic force in three-component posture and displacement data
Component parameters；The three-component gravity value and magnetic force value that the position that fathoms herein is measured are sensed according to this position three-component posture
Inclination angle, azimuth and the tendency that device provides carry out rotation processing, wherein the three-component gravity value of measurement and magnetic force value are revolved first
The position that inclination angle is zero degree is gone to, the vertical component of gravity and magnetic force will become perpendicular to ground level at this time, two measured
A mutually orthogonal horizontal gravity component and magnetic force component become being parallel to ground level；Then according to the azimuth of this measuring point will before
It states postrotational three-component gravity value and magnetic force value rotates to the position that azimuth is zero degree, at this time two water of gravity and magnetic force
It is north-south that the amount of dividing equally, which will become a horizontal component, another horizontal component is transmeridional, and vertical component is still protected
It holds perpendicular to level ground.
Preferably, three-component gravity gradient field, three-component magnetic gradient field acquisition methods are further comprising the steps of:
It is extracted and ground according to the three-component gravimetric data at different vertical depth location by forward modeling and Inversion Calculation processing
The related rock of layer gravity property or density of earth formations parameter；
It is extracted and ground according to the three-component magnetic field data at different vertical depth location by forward modeling and Inversion Calculation processing
The related rock of layer magnetic properties or stratum magnetic parameter；
Based on the rock related with stratum gravity property or density of earth formations parameter, the downhole gravity vertical gradient point
Two horizontal gradient components of amount and/or downhole gravity horizontal gradient field carry out the rock in inversion imaging acquisition well week radial extension
Stone or density of earth formations Distribution value rule, wherein rock or density of earth formations value are calculated by following equation:
ρAve=(F- △ g/ △ z)/4 π G
Wherein, △ g indicates the gravity difference in well between any two measuring point, unit mGal；△ z is indicated any two in well
Distance between a measuring point, unit m；ρAveFor the pitch density between any two measuring point in well, unit is gcm-3；F is freely
Air effect coefficient；
Based on the rock related with stratum magnetic properties or stratum magnetic parameter, the underground magnetic force vertical gradient point
Two horizontal gradient components of amount and/or underground magnetic force level gradient fields carry out the rock in inversion imaging acquisition well week radial extension
Stone or the stratum magnetism regularity of distribution, the inverting of magnetic field data is that each point is surveyed in well using three-component magnetic field acquisition device in well
Magnetic field value the average magnetic on stratum or rock stratum near the measuring point is sought out by refutation process after eliminating various influence factors
Property parameter or magnetic susceptibility.
Preferably, three-component gravity gradient field, three-component magnetic gradient field acquisition methods are further comprising the steps of:
According in the well week radial extension rock or density of earth formations Distribution value rule, the well week radial extension in
Rock or the stratum magnetism regularity of distribution to around well rock or stratum oily or high density mineral or high magnetic mineral feature
It explains or evaluates, and be inferred to the geometry of oil-bearing reservoir or high density mineral or high magnetic mineral around well and be distributed model
It encloses and volume, and then the oil gas gross reserves of oil-bearing reservoir and high density mineral or high magnetic mineral total weight at calculating
Preferably, in step according to the rock or density of earth formations Distribution value rule, the well in the well week radial extension
Rock or the stratum magnetism regularity of distribution in all radial extensions to around well rock or stratum oily or high density mineral or
High magnetic mineral feature is explained or is evaluated, and is inferred to oil-bearing reservoir or high density mineral or high magnetic mine around well
The geometry distribution and volume of object, and then the oil gas gross reserves of oil-bearing reservoir and high density mineral or high magnetic mine at calculating
In object total weight, the distribution characteristics and high density or low for going out the density of well surrounding formation or rock stratum by Inversion Calculation are specifically included
The geometry distribution and volume on density stratum or rock stratum, calculate the saturation degree of petroleum resources in stratum or rock stratum, then root
According to the porosity on stratum or rock stratum, oil-containing or air content total in stratum or rock stratum are calculated, or calculates high density mineral
Total weight；Go out the magnetic parameter or magnetic susceptibility distribution characteristics and high MAGNETIC STRATIGRAPHY of well surrounding formation or rock stratum by Inversion Calculation
Or the geometry distribution and volume of rock stratum, and then calculate the total weight of high magnetic mineral in stratum or rock stratum.
Technical solution of the present invention have it is following significant the utility model has the advantages that
Three-component gravity gradient field, three-component magnetic gradient field acquisition device in the application can be different deep in straight well
The gravity measurement under the synchronous progress three-component of same position, the magnetic-field measurement under three-component under degree, and then obtain vertical gravity
The gradient component of gradient component and vertical magnetic field；Gravity measurement under the three-component that can also be horizontally carried out in horizontal well,
Magnetic-field measurement under three-component, and then obtain the two horizontal gradient components and horizontal magnetic force gradient fields of horizontal gravity gradient field
Two horizontal gradient components.Gravity and mgnetic observations under the three-component that different location carries out in well can study same position
The gravity of synchronization and the vertical component of magnetic force and horizontal component different depth location (along device in well moving rail
Mark) on variation.
Referring to following description and accompanying drawings, only certain exemplary embodiments of this invention is disclosed in detail, specifies original of the invention
Reason can be in a manner of adopted.It should be understood that embodiments of the present invention are not so limited in range.In appended power
In the range of the spirit and terms that benefit requires, embodiments of the present invention include many changes, modifications and are equal.For a kind of reality
The feature that the mode of applying is described and/or shown can be made in one or more other embodiments in a manner of same or similar
With, be combined with the feature in other embodiment, or substitution other embodiment in feature.
Detailed description of the invention
Attached drawing described here is only used for task of explanation, and is not intended to limit model disclosed by the invention in any way
It encloses.In addition, shape and proportional sizes of each component in figure etc. are only schematical, it is used to help the understanding of the present invention, and
It is not the specific shape and proportional sizes for limiting each component of the present invention.Those skilled in the art under the teachings of the present invention, can
Implement the present invention to select various possible shapes and proportional sizes as the case may be.
Fig. 1 be the embodiment of the present invention in three-component gravity gradient field, three-component magnetic gradient field acquisition device structure show
It is intended to；
Fig. 2 is three-component gravity acquisition device housing perspectives figure in the embodiment of the present invention；
Fig. 3 is the explosive view of three-component gravity acquisition device in the embodiment of the present invention；
Fig. 4 is not coaxial gravity sensitive modular construction signal in three-component gravity acquisition device in the embodiment of the present invention
Figure；
When Fig. 5 is three-component gravity gradient field, the acquisition device operation of three-component magnetic gradient field in the embodiment of the present invention
Schematic diagram；
Fig. 6 is the flow chart of three-component gravity gradient field in the embodiment of the present invention, three-component magnetic gradient field acquisition methods.
The appended drawing reference of the figures above:
1, three-component gravity gradient field, three-component magnetic gradient field acquisition device；2, three-component Posture acquisition device；3, three
Component magnetic field acquisition device；4, three-component gravity acquisition device；41, X-axis gravity sensitive unit；42, Y-axis gravity sensitive unit；
43, Z axis gravity sensitive unit；44, the first pedestal；45, the first fixing body；46, the first shell；5, conversion and data storage are single
Member；6, multicore signal bus；7, armored cable；8, surface laboratory；10, the first acquisition unit；20, the second acquisition unit.
Specific embodiment
With reference to the drawings and the description of the specific embodiments of the present invention, details of the invention can clearly be understood.But
It is the specific embodiment of invention described herein, purpose for explaining only the invention, and cannot understand in any way
At being limitation of the present invention.Under the teachings of the present invention, technical staff is contemplated that based on any possible change of the invention
Shape, these are regarded as belonging to the scope of the present invention.It should be noted that when element is referred to as " being set to " another yuan
Part, it can directly on the other element or there may also be elements placed in the middle.When an element is considered as " connection "
Another element, it can be directly to another element or may be simultaneously present centering elements.Term " installation ",
" connected ", " connection " shall be understood in a broad sense, for example, it may be mechanical connection or electrical connection, are also possible to inside two elements
Connection, can be directly connected, can also indirectly connected through an intermediary, for the ordinary skill in the art,
The concrete meaning of above-mentioned term can be understood as the case may be.Term as used herein " vertical ", " horizontal ",
"upper", "lower", "left", "right" and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application
The normally understood meaning of technical staff is identical.The term used in the description of the present application is intended merely to description tool herein
The purpose of the embodiment of body, it is not intended that in limitation the application.Term as used herein "and/or" includes one or more
Any and all combinations of relevant listed item.
It, can be in order to solve the deficiency of magnetometer in current a few money borehole gravimeters and well currently in use in the world
Drilling well, vertical shaft, the tunnel in mining area or well water level land or the measurement for vertically carrying out three-component borehole gravity and magnetic field, in turn
Gravity gradient field and magnetic gradient field horizontally or vertically is further obtained, one kind three is proposed in embodiments herein
Component gravity gradient field, three-component magnetic gradient field acquisition device, Fig. 1 be the embodiment of the present invention in three-component gravity gradient field,
The structural schematic diagram of three-component magnetic gradient field acquisition device, as shown in Figure 1, three-component gravity gradient field in the present embodiment,
Three-component magnetic gradient field acquisition device 1 may include: 10 He of the first acquisition unit for being spaced pre-determined distance in the vertical direction
Second acquisition unit 20, first acquisition unit 10 and second acquisition unit 20 include: that three-component gravity is adopted respectively
Acquisition means 4, three-component magnetic field acquisition device 3, three-component Posture acquisition device 2；With first acquisition unit 10 and described
The three-component gravity acquisition device 4, three-component magnetic field acquisition device 3 and the three-component appearance in two acquisition units 20
The three-component gravity gradient field and three-component magnetic gradient field computation unit that 2 phase of state acquisition device is electrically connected, the three-component
Gravity gradient field and three-component magnetic gradient field computation unit are based on first acquisition unit 10 and second acquisition unit
The three-component gravimetric data of the three-component gravity acquisition device 4 acquisition in 20, three-component magnetic field acquisition device 3 acquire
Three-component magnetic field data and the three-component Posture acquisition device 2 acquisition three-component posture and displacement data obtain underground weight
Power vertical gradient component and/or two horizontal gradient components of downhole gravity horizontal gradient field, underground magnetic force vertical gradient component
And/or two horizontal gradient components of underground magnetic force level gradient fields.
Wherein, the three-component gravity acquisition device 4 includes the X for measuring the acceleration of gravity of gravity along the x axis
Axis gravity sensitive unit 41, the Y-axis gravity sensitive unit 42 for measuring the acceleration of gravity of gravity along the y axis and for surveying
Gravity is measured along the Z axis gravity sensitive unit 43 of the acceleration of gravity of Z-direction；The X-axis gravity sensitive unit 41, the Y-axis
Gravity sensitive unit 42, the Z axis gravity sensitive unit 43 be along the orthogonal laying of three axis MEMS type or cold atom type
Gravity sensitive unit；
Three-component magnetic field acquisition device 3 include for measure the X-axis magnetic field sensing cell of magnetic field value along the x axis,
For measuring the Y-axis magnetic field sensing cell of magnetic field value along the y axis and for measuring along the Z axis magnetic field of Z-direction magnetic field value biography
Feel unit.The X-axis magnetic force sensing unit, the Y-axis magnetic force sensing unit, the Z axis magnetic force sensing unit be along three axis just
Hand over the flux gate type laid or cold atom type magnetic field sensing cell.Especially when X-axis magnetic force sensing unit, the Y-axis
When magnetic force sensing unit, the magnetic field sensing cell that the Z axis magnetic force sensing unit is cold atom type, with high sensitive
Degree, stability and potential high-precision, measurement accuracy can reach μ Gal magnitude.
The three-component Posture acquisition device 2 includes that the X-axis posture sensing of the posture and displacement for measuring X-direction is single
Member, the posture for measuring Y direction and the Y-axis posture sensing unit of displacement and posture and displacement for measuring Z-direction
Z axis posture sensing unit；Three-component gravity gradient field, three-component magnetic gradient field acquisition device 1 further include: by more
Core signal bus 6 is connected to amplifier, modulus between first acquisition unit 10 and second acquisition unit 20 in turn
Conversion and data storage cell 5, the amplifier, analog-to-digital conversion and data storage cell 5 and three-component gravity gradient field
And three-component magnetic gradient field computation unit is connected, the amplifier, analog-to-digital conversion and data storage cell 5 are used for described
First acquisition unit 10 and the analog signal of second acquisition unit 20 output amplify, analog-to-digital conversion and data store,
The amplifier, analog-to-digital conversion and data storage cell 5 can be amplified to the analog signal in no less than 18 channels and 32 moulds
Number conversion.
Three-component gravity gradient field, three-component magnetic gradient field acquisition device 1 in the application is single by each acquisition
X-axis gravity sensitive unit 41, Y-axis gravity sensitive unit 42 and Z axis gravity sensitive list in member in three-component gravity acquisition device 4
Member 43 acquires three-component gravimetric data, passes through X-axis magnetic field sensing cell, the Y-axis magnetic field sensing in three-component magnetic field acquisition device 3
Unit and Z axis magnetic field sensing cell acquire three-component magnetic field data, are passed by the X-axis posture in three-component Posture acquisition device 2
Feel unit, Y-axis posture sensing unit and Z axis posture sensing unit acquisition posture and displacement data, then passes through three-component gravity
Gradient fields and three-component magnetic gradient field computation unit are to above-mentioned three-component gravimetric data, three-component magnetic field data and three-component
Posture and displacement data are analyzed and processed, to obtain downhole gravity vertical gradient component and/or downhole gravity horizontal gradient
Two horizontal gradient components, underground magnetic force vertical gradient component and/or underground magnetic force level gradient fields two horizontal ladders
Spend component.
Up and down two are provided in the underground three-component gravity gradient field of the application, three-component magnetic gradient field acquisition device 1
Set separates independent first acquisition unit 10 and the second acquisition unit 20 and a shared amplifier, analog-to-digital conversion sum number
According to storage unit 5.Above structure can only use a three-component gravity gradient field, three-component magnetic gradient field acquisition device
In the case where 1, in addition to directly acquiring three-component gravity, three-component magnetic field, three-component posture number at two sets of acquisition unit positions
According to outer, three-component gravity gradient field and three-component magnetic gradient field between two sets of acquisition units can also be calculated.It is same
Housings, which install two sets of acquisition units and a set of amplifier, analog-to-digital conversion and data storage cell 5, can greatly save instrument
The cost of device reduces the power consumption of system, optimizes the processing and manufacturing of instrument, simplifies the difficulty of underground work.One (grade) three-component
Gravity gradient field, three-component magnetic gradient field acquisition device 1, can be first directly in measuring devices inside vertical well when operation
Three-component gravity, three-component magnetic field data and the three-component attitude data of 20 position of acquisition unit 10 and the second acquisition unit, meter
Calculate gravity gradient vertical component and magnetic field gradient vertical component；The operation inside inclined shaft or horizontal well then can directly measure dress
Three-component gravity, three-component magnetic field data and the three-component posture of 20 position of first acquisition unit 10 and the second acquisition unit in setting
Data calculate gravity gradient vertical component and two horizontal components, two horizontal components of magnetic field gradient vertical component.When in underground
When being put into more (grades) the first acquisition unit 10 and the second acquisition unit 20 to be linked together with armored cable 7, complete unit
It can be with the three-component gravity and three-component of 20 position of the first acquisition unit 10 and the second acquisition unit inside simultaneous measuring apparatus
Magnetic field data calculates gravity gradient vertical component and two levels point between the first acquisition unit 10 and the second acquisition unit 20
Amount, magnetic field gradient vertical component and two horizontal components, greatly improve in well three-component gravimetric data and its gradient data and
The collecting efficiency of three-component magnetic field data and its gradient data, is greatly lowered production operation cost.
Three-component gravity gradient field, three-component magnetic gradient field acquisition device 1 in the application can be different in straight well
The synchronous progress three-component gravity measurement, three-component magnetic-field measurement of same position under depth, and then obtain vertical gravity gradient fields
With the gradient fields of vertical magnetic force；Three-component gravity measurement, the three-component magnetic-field measurement that can also be horizontally carried out in horizontal well,
And then obtain horizontal gravity gradient field and horizontal magnetic force gradient fields.The three-component gravity and three-component that different location carries out in well
Mgnetic observations can study the gravity of same position synchronization and the vertical component of magnetic force and horizontal component in different depth
Variation on position (motion track in well along device).
In order to be better understood by the application three-component gravity gradient field, three-component magnetic gradient field acquisition device
1, it will be further explained and will be illustrated below.As shown in Figure 1, three in the first acquisition unit 10 and the second acquisition unit 20
Heavy force acquisition device 4, three-component magnetic field acquisition device 3 are connected along a straight line with three-component Posture acquisition device 2, and first
Three-component gravity acquisition device 4, three-component magnetic field acquisition device 3 and three-component in acquisition unit 10 and the second acquisition unit 20
Posture acquisition device 2 puts in order can be opposite.Three-component gravity gradient field, three-component magnetic gradient field acquisition device 1 are whole
Substantially cylindrical, the guide part of the upper end and lower end with part elliptical body shape so can be in order in device lower going-into-well.
Fig. 2 is three-component gravity acquisition device housing perspectives figure in the embodiment of the present invention, and Fig. 3 is three in the embodiment of the present invention
The explosive view of heavy force acquisition device, Fig. 4 are that not coaxial gravity passes in three-component gravity acquisition device in the embodiment of the present invention
Feel modular construction schematic diagram, three-component gravity acquisition device 4 includes for measuring the acceleration of gravity of gravity along the x axis
X-axis gravity sensitive unit 41, the Y-axis gravity sensitive unit 42 for measuring the acceleration of gravity of gravity along the y axis and use
In measurement gravity along the Z axis gravity sensitive unit 43 of the acceleration of gravity of Z-direction.Three-component gravity acquisition device 4 can be with
Including the first pedestal 44, the first fixing body 45 being fixedly mounted in the middle part of the first pedestal 44, it is set in outside the first fixing body 45
First shell 46 is threadedly coupled between first shell 46 and the first pedestal 44, and the first fixing body 45 at least has there are three side, X
Axis gravity sensitive unit 41, Y-axis gravity sensitive unit 42 and Z axis gravity sensitive unit 43 are separately mounted to the first fixing body 45
On three sides, between X-axis gravity sensitive unit 41, Y-axis gravity sensitive unit 42 and Z axis gravity sensitive unit 43 two-by-two mutually
It is orthogonal.In the present embodiment, the first pedestal 44 can be cylindrical, and the pedestal of the first pedestal 44 can offer multiple screw threads
Hole, the threaded hole are used to fix the first fixing body 45 by bolt screw etc..There is external screw thread on the side wall of first pedestal 44, the
The inner sidewall of one shell, 46 lower end has internal screw thread, is connected between the two by screw thread.The cross section of first fixing body 45 is in
Square, tool are in 90 degree angles between adjacent side there are four side, with threaded hole, each side on each side
Face gravity sensitive unit is installed by threaded hole.X-axis gravity sensitive unit 41 and Y-axis gravity sensitive unit 42 are mounted on adjacent
On side.Since the first shell 46 and the first pedestal 44 make gravity sensitive unit be sealed in inside, this can be made
Under device into production wells in the well of high temperature and pressure three-component gravity and three-component magnetic field data.
Three-component gravity acquisition device 4 is a kind of based on deep silicon etching technology, high-accuracy capacitor displacement sensing technology and micro-
The gravity sensitive chip of Weak Signal Detection is three axis borehole gravity sensing units of core and weight in the three-component well that forms
Power instrument.
Each gravity sensitive unit is the gravity sensitive unit of MEMS type or cold atom type, specifically, often
One gravity sensitive unit includes micro electronmechanical (MEMS) gravity sensitive chip, the dedicated collection of Testing of Feeble Signals being fixed on pcb board
It is formed at circuit (ASIC) chip and other components.The top of first shell 46 has through-hole, for power supply and signal
It outputs and inputs.Micro electronmechanical (MEMS) gravity sensitive chip is silicon substrate integral spring-mass system, passes through micro-nano technology work
Skill carries out whole high collimation deep etching to Silicon Wafer and is formed.The size pair for the mass block that gravity is examined in gravity sensitive chip
The height of instrument mechanical thermal noise plays a decisive role, and deep silicon process technology can process thicker silicon quality bulk (500
μm), bigger mass block can be obtained in same area by comparing conventional surface technique (10 μm -100 μm).In addition, the gravity
Mechanical performance that the design and processing of sensing chip make full use of silicon materials more outstanding than metal, stability and can high-volume,
The advantage of high-accuracy processing can also accomplish more under the premise of reaching performance suitable with metal spring relative gravity sensor
Small volume, shorter process-cycle and lower cost.The displacement that gravity sensitive chip is generated by Gravity changer is by chip
Integrated high-precision variable area formula array differential capacitance displacement sensor perception, and voltage letter is converted into through Infirmness signal detecting circuit
Number.
Three-component magnetic field acquisition device 3 includes for measuring the X-axis magnetic field sensing cell of magnetic field value along the x axis, being used for
Measure the Y-axis magnetic field sensing cell of magnetic field value along the y axis and for measuring the Z axis magnetic field sensing list along Z-direction magnetic field value
Member.Magnetic field acquisition device can also include the second pedestal, the second fixing body being fixedly mounted in the middle part of the second pedestal, be set in the
Second housing outside two fixing bodies is threadedly coupled between second housing and the second pedestal, and the second fixing body at least has there are three side
Face, X-axis magnetic field sensing cell, Y-axis magnetic field sensing cell and Z axis magnetic field sensing cell are separately mounted to three of the second fixing body
It is mutually orthogonal two-by-two between X-axis magnetic field sensing cell, Y-axis magnetic field sensing cell and Z axis magnetic field sensing cell on side.Second
The structure of pedestal, the second fixing body and second housing can be with the knot of the first pedestal 44, the first fixing body 45 and the first shell 46
Structure is similar, and details are not described herein.Three-component magnetic field sensing cell is fluxgate type high-precision high temperature resistant magnetic field sensor or cold
The magnetic field sensor of atomic type, by three independent high-precision high temperature resistant fluxgate type magnetic field sensors or cold atom type
Magnetic field sensing cell is constituted, and the placement of these three open gate formula magnetic field sensors, which is fixed on a three-axis structure, collectively constitutes a phase
Mutually orthogonal three-component magnetic field sensor unit.
Three-component Posture acquisition device 2 include the posture and displacement for measuring X-direction X-axis posture sensing unit,
For measure Y direction posture and displacement Y-axis posture sensing unit and posture and displacement for measuring Z-direction Z
Axis posture sensing unit.Three-component Posture acquisition device 2 is for measuring three-component gravity acquisition device 4 and the acquisition of three-component magnetic field
Device 3 three-component gravity gradient field, three points of three-component magnetic gradient field acquisition device 1 when different location is acquired data
Posture and displacement data are measured, due to the appearance of underground three-component gravity acquisition device 4 and three-component magnetic field acquisition device 3 in measurement
State may be it is random, need the three-component gravity value and three-component magnetic field value of all measuring points to be transformed into a unified coordinate
System is gone down, it is therefore desirable to know underground three-component gravity acquisition device 4 and three-component magnetic field acquisition device 3 on each measuring point
Practical posture when measuring three-component gravity value and measuring three-component magnetic field value, could actual measurement three-component gravity to the measuring point
Value and three-component magnetic field value are converted, and are placed between three-component gravity acquisition device 4 and three-component magnetic field acquisition device 3
Three-component Posture acquisition device 2 provides for three-component gravity acquisition device 4 and three-component magnetic field acquisition dress on any point
Set 3 real three component attitude data.Three-component Posture acquisition device 2 can also include third pedestal, be fixedly mounted on third
Third fixing body in the middle part of pedestal, the third shell being set in outside third fixing body, screw thread between third shell and third pedestal
Connection, third fixing body at least have there are three side, and X-axis posture sensing unit, Y-axis posture sensing unit and Z axis posture sense
Unit is separately mounted on three sides of third fixing body, X-axis posture sensing unit, Y-axis posture sensing unit and Z axis posture
It is mutually orthogonal two-by-two between sensing unit.The structure of third pedestal, third fixing body and third shell can with the first pedestal 44,
The structure of first fixing body 45 and the first shell 46 is similar, and details are not described herein.
Three-component in three-component gravity gradient field and three-component magnetic gradient field computation unit and each acquisition unit
Gravity acquisition device 4, three-component magnetic field acquisition device 3 and three-component Posture acquisition device 2 are mutually electrically connected, three-component gravity,
Three-component magnetic gradient field computation unit can be with three-component gravity acquisition device 4, three-component magnetic field acquisition device 3 and three-component
Posture acquisition device 2 is installed together, and also may be mounted in the surface laboratory 8 outside well.Three-component gravity, three-component magnetic force
Three-component gravimetric data that gradient fields computing unit is acquired based on three-component gravity acquisition device 4, three-component magnetic field acquisition device 3
It is vertical that the three-component posture and displacement data of three-component magnetic field data and Posture acquisition the device acquisition of acquisition obtain downhole gravity
Gradient component and/or two horizontal gradient components of downhole gravity horizontal gradient field, underground magnetic force vertical gradient component and/or well
Two horizontal gradient components of lower magnetic force level gradient fields.Three-component gravity, three-component magnetic gradient field computation unit can wrap
Include: correction unit corrects three-component gravimetric data, three-component magnetic field that unit is used to acquire three-component gravity acquisition device 4
The three-component magnetic field data combination posture and displacement data that acquisition device 3 acquires carry out rotation correction, to be converted into different depth
Three-component gravimetric data and three-component magnetic field data at position；Gravity gradient field acquisition device, gravity gradient field acquisition device
For by the three-component gravimetric data at different depth position according to the horizontal or vertical component difference of gravity between two o'clock divided by two
Horizontal or vertical distance between point calculates the horizontal or vertical gradient value of downhole gravity, and then vertical according to all downhole gravities
Or horizontal gradient value calculates two horizontal gradients point of downhole gravity vertical gradient component and/or downhole gravity horizontal gradient field
Amount；Magnetic gradient field acquisition device, magnetic gradient field acquisition device are used for the three-component magnetic field at different vertical depth location
Data calculate underground divided by the horizontal or vertical distance between two o'clock according to the horizontal or vertical component difference in magnetic field between two o'clock
The horizontal or vertical gradient value of magnetic force, and then magnetic force vertical gradient in underground is calculated according to the horizontal or vertical gradient value of all underground magnetic force
Component and/or two horizontal gradient components of downhole gravity horizontal gradient field.
In a preferred embodiment, three-component gravity gradient field and three-component magnetic gradient field computation unit may be used also
To include: density parameter computing unit, density parameter computing unit is for according to the three-component weight at different vertical depth location
Force data extracts rock related with stratum gravity property or density of earth formations parameter by forward modeling and Inversion Calculation processing；Magnetism ginseng
Number computing unit, magnetic parameter computing unit are used to pass through forward modeling according to the three-component magnetic field data at different vertical depth location
Rock related with stratum magnetic properties or stratum magnetic parameter are extracted with Inversion Calculation processing；The density value regularity of distribution obtains single
Member, density value regularity of distribution acquiring unit are used to be based on rock related with stratum gravity property or density of earth formations parameter, underground
Vertical gradient of gravity component and/or two horizontal gradient components of downhole gravity horizontal gradient field carry out inversion imaging and obtain well week
Rock or density of earth formations Distribution value rule in radial extension；Magnetic regularity of distribution acquiring unit, the magnetic regularity of distribution obtain single
Member is for being based on rock related with stratum magnetic properties or stratum magnetic parameter, underground magnetic force vertical gradient component and/or well
Two horizontal gradient components of lower magnetic force level gradient fields carry out rock or stratum in inversion imaging acquisition well week radial extension
The magnetic regularity of distribution.
In a kind of more preferably embodiment, three-component gravity gradient field and three-component magnetic gradient field computation unit
Can also include: analytical unit, analytical unit be used for according in well week radial extension rock or density of earth formations Distribution value rule,
Rock or the stratum magnetism regularity of distribution in well week radial extension is to the rock or stratum oily or high density mineral around well
Or high magnetic mineral feature is explained or is evaluated.
It also proposed a kind of three-component gravity gradient field, three-component magnetic gradient field acquisition side in embodiments herein
Method, Fig. 6 are the flow chart of three-component gravity gradient field in the embodiment of the present invention, three-component magnetic gradient field acquisition methods, this three
Component gravity gradient field, three-component magnetic gradient field acquisition methods may comprise steps of:
When Fig. 5 is three-component gravity gradient field, the acquisition device operation of three-component magnetic gradient field in the embodiment of the present invention
Schematic diagram, as shown in figure 5, passing through hoister system for three-component gravity gradient field, 1 tripping in of three-component magnetic gradient field acquisition device
Into well, which may include straight well, horizontal well or the inclined shaft with certain gradient, and the well section to be measured in well is according to default
Point away from three-component gravimetric data, three-component magnetic field data and three-component posture and displacement data in regular point-by-point production wells.Three
Component gravity gradient field, three-component magnetic gradient field acquisition device 1 upper end be connected with armored cable 7, armored cable 7 be used for
Surface laboratory 8 is connected to transmit signal and data, while armored cable 7 is connected between adjacent acquisition unit, so that
It obtains and keeps signal data communication and pre-determined distance between adjacent acquisition unit.
Preset point can be interval fixed range away from rule, be also possible to be spaced different distances.If three-component gravity
Gradient fields and three-component magnetic gradient field computation unit are mounted in the surface laboratory 8 outside well, then data are passed through armouring electricity
In three-component gravity gradient field and three-component magnetic gradient field computation unit in cable 7 real-time Transmission to surface laboratory 8 or use
Computer records the data.
Three that three-component gravimetric data that three-component gravity acquisition device 4 acquires, three-component magnetic field acquisition device 3 are acquired
Component magnetic field data combination three-component posture and displacement data carry out rotation correction, to be converted at different vertical depth location
The three-component gravimetric data and three-component magnetic field data of same orientation.It is specifically as follows: according to three-component posture and displacement data
In inclination angle, azimuth and tendency calculate gravity and magnetic force three-component parameter.For example, being counted according to inclination angle, azimuth and tendency
Calculate the vertical component parameter and/or horizontal component parameter of gravity and magnetic force；Will be fathomed the three-component that position measures herein
Inclination angle, azimuth and the tendency that gravity value and magnetic force value are provided according to this position three-component attitude transducer carry out rotation processing.
Wherein, the three-component gravity value of measurement and magnetic force value are rotated to the position that inclination angle is zero degree first, at this time gravity and magnetic force
Vertical component will become perpendicular to ground level, and the mutually orthogonal horizontal gravity component of two measured and magnetic force component become
It is parallel to ground level；Then according to the azimuth of this measuring point by aforementioned postrotational three-component gravity value and the magnetic force value side of rotating to
Parallactic angle is the position of zero degree, and it is north-south that two horizontal components of gravity and magnetic force, which will become a horizontal component, at this time, separately
One horizontal component is transmeridional, and vertical component is still maintained perpendicular to level ground.Pass through rotation school in this step
Just to eliminate measuring point top stratum to the gravity value of point position and the influence of magnetic field value.
The three-component gravimetric data of same orientation at different vertical depth location is vertical according to the gravity between two o'clock
Or horizontal component difference calculates the horizontal or vertical gradient value of downhole gravity, Jin Ergen divided by the horizontal or vertical distance between two o'clock
Downhole gravity vertical gradient component and/or downhole gravity horizontal gradient are calculated according to the horizontal or vertical gradient value of all downhole gravities
Two horizontal gradient components.When installation is there are two acquisition unit on the armored cable 7 in lower going-into-well, by different vertical depth position
The three-component gravimetric data at place is set according to the horizontal or vertical component difference of gravity between two o'clock divided by between two acquisition units
Horizontal or vertical distance calculates downhole gravity vertical gradient value or horizontal gradient value, and then vertically terraced according to all downhole gravities
Angle value or horizontal gradient value calculate two levels point of downhole gravity vertical gradient component and/or downhole gravity horizontal gradient field
Amount.
By the three-component magnetic field data of the same orientation at different depth position according to the magnetic field between two o'clock is vertical or water
The amount of dividing equally difference calculates the horizontal or vertical gradient value in underground magnetic field divided by the horizontal or vertical distance between two o'clock, and then according to institute
There are two of the horizontal or vertical gradient value calculating underground magnetic force vertical gradient component in underground magnetic field and/or underground magnetic force level gradient
Horizontal component.
It is extracted and stratum weight according to the three-component gravimetric data at different depth position by forward modeling and Inversion Calculation processing
The related rock of power property or density of earth formations parameter.
It is extracted and stratum magnetic according to the three-component magnetic field data at different depth position by forward modeling and Inversion Calculation processing
The property related rock of property or stratum magnetic parameter.
Based on rock related with stratum gravity property or density of earth formations parameter, downhole gravity vertical gradient component and/or
Two horizontal gradient components of downhole gravity horizontal gradient field carry out the rock or ground in inversion imaging acquisition well week radial extension
The layer density value regularity of distribution.Borehloe gravimetry be by a series of wells measuring point park borehole gravimeter to detecting gravity
With a kind of borehole geophysics method of change in depth (i.e. vertical gradient of gravity), its object is to study earth quality and the earth
Averag density.Relative to earth's surface gravity measurement, borehole gravimeter can be deep into inside terrestrial gravitation field source, therefore be able to detect
To Gravity changer small caused by field source.In recent years, with the continuous improvement of gravity measurement precision and resolution ratio, borehole gravity
Measurement has been widely used for oil-gas exploration, reservoir evaluation, reservoir performance monitor and flow net model etc..Gravity is to close
The response characteristic for spending anomalous body is one of underlying issue of borehloe gravimetry, and gravity anomaly will be inverted into geologic data, such as
Variation of lithological, the distribution of hole band etc., these be unable to do without gravity to the abundant of the various possible responses for causing density of earth formations to change
Understanding, therefore the development that too busy to get away forward modeling works in the work of borehole gravity Data Inversion.
When three-component gravity acquisition device is deep into earth's surface hereinafter, as the increase of depth is by infinite approach earth gravitational field
Source is until enter inside field source, and basic Gravity calculation formula fails (suddenly due to being " 0 " there are measuring point and field source point distance at this time
Slightly borehole effect).The principle of borehloe gravimetry is similar to ground high-acruracy survey, is all measurement acceleration of gravity vertical component
Variation.However, carrying out the vertical direction for being limited to below ground when borehloe gravimetry.Borehloe gravimetry is different from
Method for continuous measuring used by other well loggings, it is to be measured, read by parking instrument on measuring points a series of in well,
Obtain the gravity value on different depth.The Gravity changer that instrument measures in well is influenced by following factors:
(1) free air effect FZ, it makes gravity value increase with depth-logger and increase.
(2) intermediate effect layer b, i.e. gravitation caused by the equally distributed HORIZONTAL LAYERED MEDIUM WITH HIGH ACCURACY of lateral density influence.
(3) gravitational effect of Density Anomalies distribution, it shows the other quality for not constituting horizontal homogeneous density layer in the earth's crust
Caused gravity influences, referred to as bouguer gravity anomaly △ ga。
(4) the gravitational effect △ g of earth's surface or sea-floor relieft。
(5) it is related with wellbore such as hole diameter, casing, mud caused by gravitational effect △ gb。
In conclusion the gravity value g at any point is equal to following formula in well, i.e.,
G=g0+FZ+b+△ga+△gt+△gb
In formula: g0Indicate borehole gravity value；Gravitational field vertical gradient F=0.3086Gal/m；Z indicates downhole gravity measuring point
Depth (is counted) with well head datum level；△ g/ △ z=F-4 π G ρAveB=-4 π g ρAveZ indicates effect layer among well；ρAve=G
∑pizi/ ∑ △ z indicates weighted average density；G is gravitational constant.
When differentiating to above formula, and finite quantity form being taken to indicate gravity gradient, following form can be written, i.e.,
△ g/ △ z=F-4 π G ρAve+△ga/△z+△gt/△z+△gb/△z
Three of right end are the value of very little in above formula, it is possible to be ignored, above-mentioned formula can simplify are as follows: △
G/ △ z=F-4 π G ρAve
It can thus be concluded that: ρAve=(F- △ g/ △ z)/4 π G
Above formula is the formula that density of earth formations between measuring point is calculated using borehloe gravimetry result.When between measuring point be horizontal homogeneous
When stratum, what above formula provided is the actual density value on the stratum.When actually calculating, frequently with Practical Formula, i.e.,
ρAve=3.68-11.926 △ g/ △ z；
In formula, △ g indicates the gravity difference in well between any two measuring point, unit mGal；△ z is indicated any two in well
Distance between a measuring point, unit m；ρAveFor the pitch density between any two measuring point in well, unit is gcm-3。
Borehole gravity data inversion is exactly the gravity value that each point is surveyed in well using three-component gravity acquisition device, is being disappeared
After various influence factors, being averaged for the stratum certain thickness (△ z) near the measuring point or rock stratum is sought out by refutation process
Density value ρAve。
Wherein, based on rock related with stratum gravity property or density of earth formations parameter, related with stratum magnetic properties
Two levels of rock forming mineral or stratum magnetic parameter, downhole gravity vertical gradient component and/or downhole gravity horizontal gradient field
Two horizontal gradient components of gradient component, underground magnetic force vertical gradient component and/or underground magnetic force level gradient fields carry out about
The density parameter and magnetic parameter of beam inverting or rock forming mineral or stratum in joint inversion imaging acquisition well week radial extension
The regularity of distribution.The three-component gravimetric data and three-component magnetic field data arrive to underground survey carries out mutually constraint inverting or joint is anti-
It drills, fluid density and drilling well week in rock forming mineral density or blowhole can be obtained around more structurally sound well in a certain range
The magnetic distribution and variation for enclosing rock forming mineral, can be greatly reduced single Geophysical Data Processing explanation results multi-solution or
Non- is only a property.The measurement of single geophysical parameters (such as gravity value or magnetic field strength) as a result, handle explain when all
There are multi-solution or nonuniquenesses.I.e. different buried depth, different size, different physical parameter (such as density or magnetic susceptibility) ground
Lower geologic body can generate duplicate gravity anomaly or magnetic anomalies on the ground, be gone with two different physical parameters
The geologic body of inverting underground can greatly reduce the multi-solution or nonuniqueness of geologic body explanation results.Constraint inverting refers to
During Geophysics Inversion, the constraint of variation range is provided to the parameter model of solution, the bound changed such as physical property；Or
Known conditions is assigned to the partial parameters in parameter model, such as physical parameter, known point depth parameter or known geology body thickness
Parameter etc., this constrained inverting are known as constraining inverting.Joint inversion (joint inversion) refer to and meanwhile to two kinds or
Two or more geophysical fields carries out inverting, seeks the system for meeting all geophysical observatory values for participating in inverting all
One geological model, this method are known as joint inversion.The different types of observation for participating in joint inversion will have compatible answer
Use premise.Joint inversion has Joint inversion of gravity withgeomagnetism, gravity earthquake joint inversion.With passing through, high density determined by gravity anomaly is different
The geometric dimension of normal body and buried depth carry out the constraint inverting of magnetic anomaly body, the i.e. geometric dimension in fixed high magnetic permeability anomalous body
Under conditions of buried depth is as gravity anomaly body, carry out the magnetic conductivity of the high magnetic anomaly body of only inverting.Joint inversion is specifically
GRAVITY ANOMALIES and magnetic anomalies value are put into the same objective function, the gravity and magnetic observation of a participation inverting are sought
The unified geologic anomaly body Model that value all meets.
Based on rock related with stratum magnetic properties or stratum magnetic parameter, underground magnetic force vertical gradient component and/or
Two horizontal gradient components of underground magnetic force level gradient fields carry out the rock or ground in inversion imaging acquisition well week radial extension
The magnetic regularity of distribution of layer.It is identical as above-mentioned steps, the magnetic field strength of horizontal layer MAGNETIC STRATIGRAPHY or the rock stratum any position in well
Value can accurately be calculated according to analytic formula, and the field strength values of the measuring point are measuring point nearby stratum or rock stratum in well
The function of magnetic parameter or magnetic susceptibility and stratum or rock stratum buried depth and thickness.Magnetic field data inverting is exactly to utilize magnetic field in well in well
The sensor magnetic field value that each point is surveyed in well seeks out the measuring point by refutation process after eliminating various influence factors
The average magnetic parameter or magnetic susceptibility on the neighbouring stratum certain thickness (△ z) or rock stratum.Wherein, based on related with stratum gravity property
Rock forming mineral or density of earth formations parameter, rock forming mineral related with stratum magnetic properties or stratum magnetic parameter, downhole gravity
Vertical gradient component and/or the horizontal gradient component of downhole gravity horizontal gradient field two, underground magnetic force vertical gradient component and/or
Magnetic force level gradient fields two horizontal gradient components in underground carry out constraint inverting or joint inversion imaging obtains well week radial extension
The density parameter of interior rock forming mineral or stratum and the regularity of distribution of magnetic parameter.
According to the rock in well week radial extension or the rock forming mineral in density of earth formations Distribution value rule, well week radial extension
The stratum magnetism regularity of distribution to around well rock forming mineral or stratum oily or high density mineral or high magnetic mineral feature
It explains or evaluates, and the geometry of oil-bearing reservoir or high density mineral or high magnetic mineral is distributed model around well at deduction
It encloses and volume, and then the oil gas gross reserves of oil-bearing reservoir and high density mineral or high magnetic mineral total weight at calculating.Wherein,
By Inversion Calculation go out the density of well surrounding formation or rock stratum distribution characteristics and high density or low-density stratum or rock stratum it is several
When what distribution and volume, the saturation degree of petroleum resources in stratum or rock stratum can be calculated, then according to stratum or rock stratum
Porosity, calculate oil-containing or air content total in stratum or rock stratum, or calculate the total weight of high density mineral.When logical
Cross Inversion Calculation go out well surrounding formation or rock stratum magnetic parameter or magnetic susceptibility distribution characteristics and high MAGNETIC STRATIGRAPHY or rock stratum it is several
When what distribution and volume, the total weight of high magnetic mineral in stratum or rock stratum can be calculated.
Conventional gravimetric prospecting observes, study is natural earth gravitational field, since adjacent ground surface is up to earth depth
All there is the uneven of material density distribution at place, so comparatively gravimetric prospecting has relatively inexpensive and depth of exploration big by two
A advantage.And borehloe gravimetry is to be trapped using dedicated borehole gravimeter along borehole survey gravity with the variation of depth
It can be carried out in pipe or not cased drilling, measurement result can obtain the change of rock density in drilling surrounding a certain range
Change.Texture makes ﹐ division metallogenic prospect with can solve following business ﹕ 1, Research on Crustal depth cage structure ﹔ survey region for gravimetric prospecting
Area；2, the geology Tian Tu ﹐ of covered area includes delineation Duan Lie ﹑ Duan block Gou Zao ﹑ intrusive body etc.；3, it is widely used in generaI investigation and exploration is flammable
Property mineral deposit (Shi You ﹑ Tians Ran Qi ﹑ coal), 4, find out regional structure, determine the local structures such as substrate Qi Fu ﹐ discovery Yan Qiu ﹑ anticline；5,
GeneraI investigation and exploration metalliferous deposit (the more metals of iron ﹑ chromium ﹑ copper ﹑ and other), be mainly used for finding out at the related construction of mine and rock mass,
It carries out looking for mine indirectly；6, it is also commonly used for finding the high density ore body of great ﹑ near surface, and calculates the reserves of ore body；Engineering geology
Investigation, such as Detection of Karst, recourse fractured zones etc..
The three-component gravity and three-component mgnetic observations that carry out in well can study the gravity of same position synchronization
With the variation of the vertical component and horizontal component of magnetic force on different vertical depth positions (motion track in well along device),
The variation is by the vertical and lateral of ground lower density and underground magnetism heterogeneous body (fluid in rock forming mineral or blowhole)
Caused by the variation of position.Three-component gravity can be used to calculate the three-component gravity around drilling well with the variation of depth in well
Variation, by the variation calculating of three-component gravitational field in well be inferred to around drilling well in a certain range rock forming mineral density or
The variation of fluid density in blowhole, for survey region geological structure, exploration Solid Mineral and petroleum resources and
The long-term dynamics monitoring of underground fluid changes in distribution is carried out to the oil gas field for entering the productive life.Magnetic survey is ground magnetic survey to ground in well
Under extension, three-component magnetic field can be used to calculate the magnetic variation of drilling well surrounding rock with the variation of depth in well, mainly
For dividing magnetic rock stratum, blind ore etc. is found, data plays confirmation and supplementary function to ground magnetic survey.Furthermore it is also possible to understand
Subsurface rock magnetism inhomogeneities, and then infer that crustal structure and construction, ocean floor generates and history of evolution, and reconnoitre continent side
The distribution of mineral deposits in edge area.
Three-component gravity gradient field, three-component magnetic gradient field acquisition device and its acquisition methods can be in well of the invention
The density and the magnetic regularity of distribution for detecting the rock forming mineral layer or stratum around well section well to be measured in larger scope, can also improve
To the resolution capability of target geological body, the various human-made noises in ground are greatly reduced to underground three-component gravity and three-component magnetic force
The interference of measurement data, improves the signal-to-noise ratio of underground three-component gravity and three-component mgnetic observations data, and can provide stratum
The information of occurrence and wellbore offset, and realize the integrated interpretation to reservoir parameter and evaluation.In addition, the three-component weight in the application
Force gradient field, three-component magnetic gradient field acquisition device can the following three-component gravity into production wells in hp-ht well and three points
Magnetic field data is measured, current downhole gravity data acquisition instrument and underground magnetic field data currently in use in the world is overcome at one stroke and adopts
Collect instrument cannot in high temperature well simultaneously operation difficulty.The three-component gravimetric data and three-component magnetic field number arrived to underground survey
According to carry out mutually constraint inverting or joint inversion can obtain around more structurally sound well in a certain range rock forming mineral density or
The magnetic distribution and variation of fluid density and drilling well surrounding rock, can be greatly reduced single geophysical data in blowhole
Handle explanation results multi-solution or it is non-only be a property.
All articles and reference disclosed, including patent application and publication, for various purposes by quoting knot
Together in this.Describing combined term " substantially by ... constitute " should include identified element, ingredient, component or step and reality
Other elements, ingredient, component or the step of the basic novel feature of the combination are not influenced in matter.Using term "comprising" or
" comprising " describes the combination of element here, ingredient, component or step it is also contemplated that substantially by these elements, ingredient, component
Or the embodiment that step is constituted.Here by using term " can with ", it is intended to illustrate that " can with " includes described any
Attribute is all optional.Multiple element, ingredient, component or step can be mentioned by single integrated component, ingredient, component or step
For.Alternatively, single integrated component, ingredient, component or step can be divided into multiple element, ingredient, component or the step of separation
Suddenly.For describe the open "a" or "an" of element, ingredient, component or step do not say in order to exclude other elements, at
Point, component or step.
All the embodiments in this specification are described in a progressive manner, the highlights of each of the examples are with
The difference of other embodiments, the same or similar parts between the embodiments can be referred to each other.Above-described embodiment is only
Illustrate technical concepts and features of the invention, its object is to those skilled in the art can understand the contents of the present invention
And implement accordingly, it is not intended to limit the scope of the present invention.Equivalence changes made by all Spirit Essences according to the present invention
Or modification, it should be covered by the protection scope of the present invention.
Claims (12)
1. a kind of three-component gravity gradient field, three-component magnetic gradient field acquisition device, which is characterized in that the three-component gravity
Gradient fields, three-component magnetic gradient field acquisition device include:
It is spaced the first acquisition unit and the second acquisition unit of pre-determined distance, first acquisition unit and second acquisition are single
Member includes: three-component gravity acquisition device, three-component magnetic field acquisition device, three-component Posture acquisition device respectively；
With the three-component gravity acquisition device, the three-component in first acquisition unit and second acquisition unit
The three-component gravity gradient field and three-component magnetic force that magnetic field acquisition device and the three-component Posture acquisition device are mutually electrically connected
Gradient fields computing unit, three-component gravity gradient field and three-component magnetic gradient field computation unit are based on first acquisition
The three-component gravimetric data, three points described of three-component gravity acquisition device acquisition in unit and second acquisition unit
Measure magnetic field acquisition device acquisition three-component magnetic field data and the three-component Posture acquisition device acquisition three-component posture and
Displacement data obtains two horizontal gradient components, wells of downhole gravity vertical gradient component and/or downhole gravity horizontal gradient field
Two horizontal gradient components of lower magnetic force vertical gradient component and/or underground magnetic force level gradient fields.
2. three-component gravity gradient according to claim 1 field, three-component magnetic gradient field acquisition device, feature exist
In the three-component gravity acquisition device includes the X-axis gravity sensitive list for measuring the acceleration of gravity of gravity along the x axis
Member, the Y-axis gravity sensitive unit for measuring the acceleration of gravity of gravity along the y axis and for measuring gravity along Z-direction
Acceleration of gravity Z axis gravity sensitive unit；
The X-axis gravity sensitive unit, the Y-axis gravity sensitive unit, the Z axis gravity sensitive unit are along the orthogonal cloth of three axis
If MEMS type or cold atom type gravity sensitive unit；
Three-component magnetic field acquisition device includes for measuring the X-axis magnetic field sensing cell of magnetic field value along the x axis, for surveying
Measure the Y-axis magnetic field sensing cell of magnetic field value along the y axis and for measuring the Z axis magnetic field sensing cell along Z-direction magnetic field value；
The X-axis magnetic force sensing unit, the Y-axis magnetic force sensing unit, the Z axis magnetic force sensing unit are along the orthogonal cloth of three axis
If flux gate type or cold atom type magnetic field sensing cell；
The three-component Posture acquisition device includes the X-axis posture sensing unit of the posture and displacement for measuring X-direction, uses
In the Z axis of the posture of measurement Y direction and the Y-axis posture sensing unit of displacement and posture and displacement for measuring Z-direction
Posture sensing unit；
Three-component gravity gradient field, three-component magnetic gradient field acquisition device further include: it is single to be connected to first acquisition
Amplifier, analog-to-digital conversion and data storage cell between first and described second acquisition unit, the amplifier, analog-to-digital conversion and
Data storage cell is connected with three-component gravity gradient field and three-component magnetic gradient field computation unit, the amplification
Device, analog-to-digital conversion and data storage cell are used to believe the simulation that first acquisition unit and second acquisition unit export
It number amplifies, the storage of analog-to-digital conversion and data, the amplifier, analog-to-digital conversion and data storage cell can be logical to no less than 18
The signal in road amplifies and 32 analog-to-digital conversions.
3. three-component gravity gradient according to claim 2 field, three-component magnetic gradient field acquisition device, feature exist
In the three-component gravity acquisition device further includes the first pedestal, first be fixedly mounted in the middle part of first pedestal installation
Body, the first shell being set in outside first fixing body, are threadedly coupled, institute between first shell and first pedestal
It states the first fixing body at least to have there are three side, the X-axis gravity sensitive unit, the Y-axis gravity sensitive unit and the Z axis
Gravity sensitive unit is separately mounted on three sides of first fixing body, the X-axis gravity sensitive unit, the Y-axis
It is mutually orthogonal two-by-two between gravity sensitive unit and the Z axis gravity sensitive unit.
4. three-component gravity gradient according to claim 2 field, three-component magnetic gradient field acquisition device, feature exist
In three-component magnetic field acquisition device further includes the second pedestal, the second fixing body being fixedly mounted in the middle part of the second pedestal, set
The second housing being located at outside second fixing body is threadedly coupled between the second housing and second pedestal, and described
Two fixing bodies at least have there are three side, the X-axis magnetic field sensing cell, the Y-axis magnetic field sensing cell and the Z axis magnetic field
Sensing unit is separately mounted on three sides of second fixing body, the X-axis magnetic field sensing cell, the Y-axis magnetic field
It is mutually orthogonal two-by-two between sensing unit and the Z axis magnetic field sensing cell.
5. three-component gravity gradient according to claim 2 field, three-component magnetic gradient field acquisition device, feature exist
In the three-component Posture acquisition device further includes third pedestal, the third fixing body being fixedly mounted in the middle part of third pedestal, set
The third shell being located at outside the third fixing body is threadedly coupled between the third shell and the third pedestal, and described
Three fixing bodies at least have there are three side, the X-axis posture sensing unit, the Y-axis posture sensing unit and the Z axis posture
Sensing unit is separately mounted on three sides of the third fixing body, the X-axis posture sensing unit, the Y-axis posture
It is mutually orthogonal two-by-two between sensing unit and the Z axis posture sensing unit.
6. three-component gravity gradient according to claim 2 field, three-component magnetic gradient field acquisition device, feature exist
In the three-component gravity acquisition device, three-component magnetic field acquisition device and the three-component Posture acquisition device are along one
Straight line is connected, three-component gravity gradient field, three-component magnetic gradient field acquisition device upper end be connected with armored cable,
The armored cable instructs with transfer operation and transmits data for being connected with surface laboratory.
7. three-component gravity gradient according to claim 1 field, three-component magnetic gradient field acquisition device, feature exist
In three-component gravity gradient field and three-component magnetic gradient field computation unit include: correction unit, and the correction unit is used
In the three-component gravity acquisition device is acquired underground three-component gravimetric data, the three-component magnetic field acquisition device acquisition
Underground three-component magnetic field data carry out rotation correction in conjunction with the three-component posture and displacement data, to be converted into different depth
The three-component gravimetric data and three-component magnetic field data of same orientation at position；
Gravity gradient field acquisition device, gravity gradient field acquisition device are used for the phase Tongfang at the different depth position
The three-component gravimetric data of position is calculated according to the horizontal or vertical component difference of gravity between two o'clock divided by the distance between two o'clock
The horizontal or vertical gradient value of downhole gravity, and then downhole gravity is obtained according to all horizontal or vertical gradient values of downhole gravity
Vertical gradient field and/or downhole gravity horizontal gradient field；
Magnetic gradient field acquisition device, magnetic gradient field acquisition device are used for the phase Tongfang at the different depth position
The three-component magnetic field data of position is according to the horizontal or vertical component difference in magnetic field between two o'clock divided by horizontal or vertical between two o'clock
Distance calculates the horizontal or vertical gradient value in underground magnetic field, and then is obtained according to all horizontal or vertical gradient values in underground magnetic field
To underground magnetic force vertical gradient component and/or two horizontal gradient components of underground magnetic force level gradient fields.
8. a kind of obtain dress using the three-component gravity gradient field any in claim 1 to 7, three-component magnetic gradient field
The three-component gravity gradient field set, three-component magnetic gradient field acquisition methods, which is characterized in that the three-component gravity gradient
, three-component magnetic gradient field acquisition methods the following steps are included:
By three-component gravity gradient field, three-component magnetic gradient field acquisition device well section to be measured according to preset point away from rule by
Three-component gravimetric data, three-component magnetic field data and three-component posture and displacement data in point production wells；
The three-component gravimetric data of three-component gravity acquisition device acquisition, three-component magnetic field acquisition device are acquired
Three-component magnetic field data carries out rotation correction in conjunction with the three-component posture and displacement data, to be converted into different depth position
The three-component gravimetric data and three-component magnetic field data of the same orientation at place；
By the three-component gravimetric data of the same orientation at the different depth position according to the gravity between two o'clock is vertical or water
The amount of dividing equally difference calculates the horizontal or vertical gradient value of downhole gravity divided by the horizontal or vertical distance between two o'clock, and then according to institute
There is the horizontal or vertical gradient value of the downhole gravity that downhole gravity vertical gradient component and/or downhole gravity horizontal ladder is calculated
Spend two horizontal gradient components of field；
By the three-component magnetic field data of the same orientation at the different depth position according to the magnetic field between two o'clock is vertical or water
The amount of dividing equally difference calculates the horizontal or vertical gradient value in underground magnetic field divided by the horizontal or vertical distance between two o'clock, and then according to institute
There is the horizontal or vertical gradient value in underground magnetic field that underground magnetic field vertical gradient component and/or underground magnetic field levels ladder is calculated
Spend two horizontal gradient components of field.
9. three-component gravity gradient according to claim 8 field, three-component magnetic gradient field acquisition methods, feature exist
In the three-component gravimetric data that acquires the three-component gravity acquisition device in step, three-component magnetic field acquisition device
The three-component magnetic field data of acquisition carries out rotation correction in conjunction with the three-component posture and displacement data, to be converted into different depths
Spend in the three-component gravimetric data and three-component magnetic field data of the same orientation at position, specifically: according to three-component posture and
Inclination angle, azimuth and tendency calculate the vertical component parameter and/or horizontal component parameter of gravity and magnetic force in displacement data；It will be
Inclination angle that the three-component gravity value and magnetic force value that this position that fathoms measures are provided according to this position three-component attitude transducer,
Azimuth and tendency carry out rotation processing, wherein it is zero that the three-component gravity value of measurement and magnetic force value, which are rotated to inclination angle, first
The position of degree, the vertical component of gravity and magnetic force will become perpendicular to ground level at this time, and two measured are mutually orthogonal
Horizontal gravity component and magnetic force component become being parallel to ground level；Then according to the azimuth of this measuring point by aforementioned postrotational three
Component gravity value and magnetic force value rotate to the position that azimuth is zero degree, and two horizontal components of gravity and magnetic force will become at this time
One horizontal component is north-south, another horizontal component is transmeridional, and vertical component is still maintained perpendicular to level
Ground.
10. three-component gravity gradient according to claim 8 field, three-component magnetic gradient field acquisition methods, feature exist
In three-component gravity gradient field, three-component magnetic gradient field acquisition methods are further comprising the steps of:
It is extracted and stratum weight according to the three-component gravimetric data at different vertical depth location by forward modeling and Inversion Calculation processing
The related rock of power property or density of earth formations parameter；
It is extracted and stratum magnetic according to the three-component magnetic field data at different vertical depth location by forward modeling and Inversion Calculation processing
The property related rock of property or stratum magnetic parameter；
Based on the rock related with stratum gravity property or density of earth formations parameter, the downhole gravity vertical gradient component
And/or two horizontal gradient components of downhole gravity horizontal gradient field carry out the rock in inversion imaging acquisition well week radial extension
Or density of earth formations Distribution value rule, wherein rock or density of earth formations value are calculated by following equation:
ρAve=(F- △ g/ △ z)/4 π G
Wherein, △ g indicates the gravity difference in well between any two measuring point, unit mGal；△ z indicates that any two are surveyed in well
Distance between point, unit m；ρAveFor the pitch density between any two measuring point in well, unit is gcm-3；F is free air
Effect coefficient；
Based on the rock related with stratum magnetic properties or stratum magnetic parameter, the underground magnetic force vertical gradient component
And/or two horizontal gradient components of underground magnetic force level gradient fields carry out the rock in inversion imaging acquisition well week radial extension
Or the stratum magnetism regularity of distribution, the inverting of magnetic field data is that each point is surveyed in well using three-component magnetic field acquisition device in well
Magnetic field value seeks out the average magnetic on stratum or rock stratum near the measuring point by refutation process after eliminating various influence factors
Parameter or magnetic susceptibility.
11. three-component gravity gradient according to claim 10 field, three-component magnetic gradient field acquisition methods, feature exist
In three-component gravity gradient field, three-component magnetic gradient field acquisition methods are further comprising the steps of:
According to the rock in the well week radial extension or the rock in density of earth formations Distribution value rule, the well week radial extension
The stratum magnetism regularity of distribution to around well rock or stratum oily or high density mineral or high magnetic mineral feature carry out
Explain or evaluation, and be inferred to around well the geometry distribution of oil-bearing reservoir or high density mineral or high magnetic mineral and
Volume, and then the oil gas gross reserves of oil-bearing reservoir and high density mineral or high magnetic mineral total weight at calculating.
12. three-component gravity gradient according to claim 11 field, three-component magnetic gradient field acquisition methods, feature exist
In, step according in the well week radial extension rock or density of earth formations Distribution value rule, the well week radial extension in
Rock or the stratum magnetism regularity of distribution to around well rock or stratum oily or high density mineral or high magnetic mineral it is special
Sign is explained or is evaluated, and is inferred to the geometry of oil-bearing reservoir or high density mineral or high magnetic mineral around well and is distributed
Range and volume, and then at calculating in the oil gas gross reserves of oil-bearing reservoir and high density mineral or high magnetic mineral total weight,
Specifically include by Inversion Calculation go out well surrounding formation or rock stratum density distribution characteristics and high density or low-density stratum or
The geometry distribution and volume of rock stratum, calculate the saturation degree of petroleum resources in stratum or rock stratum, then according to stratum or rock
The porosity of layer, calculates oil-containing or air content total in stratum or rock stratum, or calculate the total weight of high density mineral；It is logical
Cross Inversion Calculation go out well surrounding formation or rock stratum magnetic parameter or magnetic susceptibility distribution characteristics and high MAGNETIC STRATIGRAPHY or rock stratum it is several
What distribution and volume, and then calculate the total weight of high magnetic mineral in stratum or rock stratum.
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