CN106979006A - The determination method and apparatus of strata pressure - Google Patents
The determination method and apparatus of strata pressure Download PDFInfo
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- CN106979006A CN106979006A CN201710349195.4A CN201710349195A CN106979006A CN 106979006 A CN106979006 A CN 106979006A CN 201710349195 A CN201710349195 A CN 201710349195A CN 106979006 A CN106979006 A CN 106979006A
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- 239000004575 stone Substances 0.000 claims description 4
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- 238000005056 compaction Methods 0.000 description 10
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 8
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- 239000010430 carbonatite Substances 0.000 description 2
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/14—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention discloses a kind of determination method and apparatus of strata pressure.Wherein, this method includes：Obtain the well logging data in the first well depth；Well logging data based on the first well depth calculate the rock porosity and overburden pressure in the first well depth；The vertical effective stress in the first well depth is determined according to the rock porosity in the first well depth；The strata pressure in the first well depth is determined according to the vertical effective stress in the first well depth and overburden pressure.The determination method that the present invention solves the strata pressure in correlation technique can not be applied in the different regional technical problem of formation strength.
Description
Technical field
The present invention relates to data processing field, in particular to a kind of determination method and apparatus of strata pressure.
Background technology
At present, in the drilling well development field such as oil, shale gas, strata pressure is an important underlying parameter.According to point
Cloth can select favourable hydrocarbon potential exploration area, in information well selection of the new exploratory area with reference to strata pressure, to improving
The strata pressure success rate of prospect pit is significant；Reasonable selection drilling fluid density is changed according to strata pressure, is conducive to implementing
Near balance pressure drilling technology, reservoir protec-tion, it is ensured that drilling safety and raising drilling speed.
For drilled in well, strata pressure can be obtained by well testing.Formation pressure data that this method is obtained directly, can
Lean on, but generally data point is seldom, it is impossible to obtain continuous section.Since nineteen fifty, domestic and foreign scholars are to strata pressure evaluation
Explored and studied, it is proposed that prediction, monitoring and the method calculated of some strata pressures；Such as, surface seismic is used before brill
Data carries out prediction of formation pressure, and strata pressure is monitored in real time using drilling parameter in drilling process, and by surveying
Well data carry out strata pressure evaluation；In section plane of sand shale, using well logging or seismic data, obtained according to compacting theoretical calculation
To continuous pore pressure section.Theoretical according to compacting, the interval transit time of mud stone is with depth under normal barometric gradient
Increase and reduce.For the stratum of normal compaction, there is a normal compaction trend line.When interval transit time, to deviate this normal
Trendline after, generally would indicate that the exception of pressure.But existing strata pressure method is confined to sand shale lithology mostly, pre-
Precision is relatively low.But it is inapplicable for shale gas drilling well marine facies carbonate formation pressure, its reason is, carbonate formation be with
Based on chemical bond effect, reflect the rock-drillability index value and compressive strength of rock UCS of formation strength, not with carbonate formation
The increase of buried depth and increase, its " Trendline " actually be a vertical line, this explanation overlying rock pressure do not act on hole stream
On body, but undertaken by rock matrix.Therefore, the pressure for carbonate formation such as tradition research method based on strata pressure
Power monitoring is inapplicable.
Determination method for the strata pressure in correlation technique can not be applied in the different regional technology of formation strength
Problem, not yet proposes effective solution at present.
The content of the invention
The embodiments of the invention provide a kind of determination method and apparatus of strata pressure, at least to solve in correlation technique
The determination method of strata pressure can not be applied in the different regional technical problem of formation strength.
One side according to embodiments of the present invention includes there is provided a kind of determination method of strata pressure, this method：Obtain
Take the well logging data in the first well depth；Well logging data based on the first well depth calculate the blowhole in the first well depth
Degree and overburden pressure；The vertical effective stress in the first well depth is determined according to the rock porosity in the first well depth；According to
The strata pressure in the first well depth is determined in the vertical effective stress and overburden pressure of the first well depth.
Further, the well logging data include well depth and density of earth formations, are surveyed based on first well depth with brill
The calculating of well data includes in the overburden pressure of first well depth：In the well logging data for being extracted in first well depth
Including first well depth value and the density of earth formations in first well depth；Using default exponential formula and with described first
Well depth and first well depth density of earth formations determine first well depth overburden pressure.
Further, determined according to the vertical effective stress in first well depth and overburden pressure described first
The strata pressure of well depth includes：Determined and in institute using the relational expression of strata pressure and vertical effective stress and overburden pressure
The corresponding strata pressure in first well depth of vertical effective stress and overburden pressure of the first well depth is stated, wherein, institute
It is the pass pre-established based on effective stress theorem to state strata pressure and the relational expression of vertical effective stress and overburden pressure
It is formula.
Further, the well logging data include the interval transit time of the acoustic wave of rock time difference and rock matrix, based on institute
The well logging data for stating the first well depth calculate the rock porosity in first well depth using equation below calculating：Wherein, Φ is rock porosity, and Δ T is the acoustic wave of rock time difference and unit is μ s/m, Δ TmaTo be described
The interval transit time and unit of rock matrix are μ s/m, and f is sound wave formation capacity.
Further, determine there is effect in the vertical of first well depth according to the rock porosity in first well depth
Power is calculated using equation below：Wherein, σeFor vertical effective stress, Φ0For the blowhole of earth's surface
Degree, β is compacting factor.
Further, determined according to the vertical effective stress in first well depth and overburden pressure described first
The strata pressure of well depth is calculated using equation below：Pp=σz-σeWherein, PpFor strata pressure, σzFor overburden pressure.
Further, this method also includes：The well logging data of different well depths are obtained to determine different well depths respectively
Strata pressure；The curve that strata pressure changes with well depth is drawn according to the strata pressure of the different well depths.
Another aspect according to embodiments of the present invention, additionally provides a kind of determining device of strata pressure, and the device includes：
Acquiring unit, for obtaining the well logging data in the first well depth；Computing unit, for the well logging based on the first well depth
Data calculate the rock porosity and overburden pressure in the first well depth；First determining unit, for according in the first well depth
Rock porosity determine the first well depth vertical effective stress；Second determining unit, for according to hanging down in the first well depth
Straight effective stress and overburden pressure determine the strata pressure in the first well depth.
Another aspect according to embodiments of the present invention, additionally provides a kind of storage medium, and the storage medium includes storage
Program, wherein, where the storage medium is controlled when described program is run equipment perform the present invention strata pressure really
Determine method.
Another aspect according to embodiments of the present invention, additionally provides a kind of processor, and the processor is used for operation program,
Wherein, the determination method of the present invention is performed when described program is run.
In embodiments of the present invention, by obtaining the well logging data in the first well depth；Based on the first well depth with brill
Log data calculates the rock porosity and overburden pressure in the first well depth；It is true according to the rock porosity in the first well depth
It is scheduled on the vertical effective stress of the first well depth；Determined according to the vertical effective stress in the first well depth and overburden pressure the
The strata pressure of one well depth, solving the determination method of the strata pressure in correlation technique can not apply different in formation strength
The technical problem in area, and then realize the technique effect for the strata pressure that can determine the different stratum of intensity.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is a kind of flow chart of the determination method of optionally stressor layer according to embodiments of the present invention；
Fig. 2 is a kind of schematic diagram of the determining device of optionally stressor layer according to embodiments of the present invention.
Embodiment
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, should all belong to the model that the present invention is protected
Enclose.
It should be noted that term " first " in description and claims of this specification and above-mentioned accompanying drawing, "
Two " etc. be for distinguishing similar object, without for describing specific order or precedence.It should be appreciated that so using
Data can exchange in the appropriate case, so as to embodiments of the invention described herein can with except illustrating herein or
Order beyond those of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover
Lid is non-exclusive to be included, for example, the process, method, system, product or the equipment that contain series of steps or unit are not necessarily limited to
Those steps or unit clearly listed, but may include not list clearly or for these processes, method, product
Or the intrinsic other steps of equipment or unit.
This application provides the embodiment of a kind of determination method of strata pressure.
Fig. 1 is a kind of flow chart of the determination method of optionally stressor layer according to embodiments of the present invention, such as Fig. 1 institutes
Show, this method comprises the following steps：
Step S101, obtains the well logging data in the first well depth.
Well logging data are to wait to log well or be acquired obtained well logging data with the adjacent well of waiting to log well, or
Person or the data determined according to the well logging data for waiting to log well and/or the well adjacent with treating well logging is collected.
Step S102, the well logging data based on the first well depth calculate the rock porosity and upper overlying strata in the first well depth
Stressor layer.
Step S103, the vertical effective stress in the first well depth is determined according to the rock porosity in the first well depth.
Step S104, is determined on the ground of the first well depth according to the vertical effective stress in the first well depth and overburden pressure
Stressor layer.
The embodiment is by obtaining the well logging data in the first well depth；Well logging data meter based on the first well depth
Calculate the rock porosity and overburden pressure in the first well depth；Determined according to the rock porosity in the first well depth in the first well
Deep vertical effective stress；Determined according to the vertical effective stress in the first well depth and overburden pressure on the ground of the first well depth
Stressor layer, solving the determination method of the strata pressure in correlation technique can not apply in the different regional technology of formation strength
Problem, and then realize the technique effect for the strata pressure that can determine the different stratum of intensity.
In the case where well logging data include well depth and density of earth formations, a kind of optional implementation of above-described embodiment is used as
Mode, the well logging data calculating based on the first well depth can include in the overburden pressure of the first well depth：It is extracted in
The value and the density of earth formations in the first well depth for the first well depth that the well logging data of one well depth include；It is public using default index
Formula and with the first well depth and the first well depth density of earth formations determine the first well depth overburden pressure.
As a kind of optional embodiment of above-described embodiment, according to the vertical effective stress in the first well depth and upper overlying strata
Stressor layer determines to include in the strata pressure of the first well depth：Utilize strata pressure and vertical effective stress and overlying rock pressure
The relational expression of power determine with the corresponding stratum in the first well depth of vertical effective stress and overburden pressure of the first well depth
Pressure, wherein, the relational expression of strata pressure and vertical effective stress and overburden pressure is advance based on effective stress theorem
The relational expression of foundation.
In the case of the interval transit time that well logging data include the acoustic wave of rock time difference and rock matrix, above-mentioned reality is used as
A kind of optional embodiment of example is applied, the well logging data calculating based on the first well depth can in the rock porosity of the first well depth
To be calculated using equation below：Wherein, Φ is rock porosity, and Δ T is the acoustic wave of rock time difference and unit is
μ s/m, Δ TmaIt is μ s/m for the interval transit time and unit of rock matrix, f is sound wave formation capacity.
Determine that the vertical effective stress in the first well depth can be used according to the rock porosity in the first well depth following public
Formula is calculated：Wherein, σeFor vertical effective stress, Φ0For the rock porosity of earth's surface, β is for compacting
Number.
Can in the strata pressure of the first well depth according to the vertical effective stress in the first well depth and overburden pressure determination
To be calculated using equation below：Pp=σz-σeWherein, PpFor strata pressure, σzFor overburden pressure.
Above-described embodiment provide strata pressure determination method can also obtain the well logging data of different well depths with
The strata pressure of different well depths is determined respectively, and the song that strata pressure changes with well depth is drawn according to the strata pressure of different well depths
Line.
The step of with reference to an embodiment to above-described embodiment, illustrates：
In the case where the method for application embodiment offer determines shale gas drilling well marine facies carbonate formation pressure, perform
Following steps：
Step a, collection offset well log data or collection in worksite this well LWD well logging data, utilize empirical equation rock
Porosity；
Step b, utilization index curve extrapolation calculate overburden pressure；
Step c, utilize empirical equation calculate vertical effective stress；
Step d, set up strata pressure and vertical effective stress relational expression；
Step e, calculating strata pressure；
The curve that step f, drafting strata pressure change with well depth.
In step a, collection in worksite well logging (Logging While Drilling, abbreviation LWD) real-time parameter, meter
Calculation obtains porosity, and the present invention is using the sharp formula in the bosom corrected：
Wherein, Φ is rock porosity, and Δ T is the acoustic wave of rock time difference and unit is μ s/m, Δ TmaFor the sound of rock matrix
The ripple time difference and unit are μ s/m, and f is sound wave formation capacity.
It can be seen that by formula 1, change little carbonatite geologic section, Δ T to depositional environmentmaThere is relative determination with f values
Value, according to the research to certain work area marine bed pressure, it is proposed that certain μ s/m, f sound of work area carbonatite skeleton interval transit time value 59
Rolling land layer factor value 2.9, other work areas refer to this value and are adjusted, by the interval transit time value of rock matrix and stratum water
Substitution formula 1, can be exported：
In step a, collection in worksite LWD well loggings real-time parameter includes well depth, interval transit time, the sound wave of rock matrix
The time difference, the interval transit time of stratum water.
In b step, according to offset well density log data or coring data, obtained by returning calculating：
σz=0.465pbH formulas 3
In formula 3, pbFor actual rock density, unit is g/cm3, H is true vertical depth, and unit is km.
In stepb, collection in worksite LWD well loggings real-time parameter includes well depth, density of earth formations.
In step c, vertical effective stress is calculated using the relational expression of porosity and effective stress is returned.
Generally, its theoretical foundation of the prediction of formation pore pressure is that " deposit disequilibrium compaction causes stratum undercompaction simultaneously
Produce undercompaction and produce abnormal pressure " this most common abnormal pressure Forming Mechanism.For the deposit of stratum homogeneous, hole
Porosity and vertical effective stress σeThere is following relation (being commonly referred to as compacted function)：
In formula 4, Φ0The porosity of surface rock is represented, 30%, i.e. Φ can be generally taken0=30, σeFor it is vertical effectively
Stress, unit is g/cm3, β is compacting factor.In the case of normal compaction, the vertical effective stress of deposit is with buried depth
Increase and incrementally increase, porosity reduces.For undercompacted formation, porosity is bigger than normal than normal compaction situation, that is, deviate from just
Normal compaction trend line, causes formation compaction according to disequilibrium compaction and produces abnormal pressure, then it is assumed that there is abnormal pressure at this.
By further derivation, formula 4 can be deformed into：
Its compacting function of marine carbonate stratum can equally be obtained by actual measurement porosity data or well-log information, if marine facies
The Φ of carbonate strata0=30,Formula 5 can be further simplified as：
σe=0.38 (ln 30-ln Φ)=1.292-0.38ln Φ formulas 6
In step d, it is applied to many saturations and the effective stress theorem of porous media according to what Terzaghi was proposed, sets up
Strata pressure and vertical effective stress relational expression：
Pp=σz-σeFormula 7
In formula 7, PpFor strata pressure, unit is g/cm3。
In step e, strata pressure is calculated by porosity calculation, it is assumed that be overlying rock pressure gradient σz=2.31g/
cm3, formula 7 is substituted into, formula 7 can be further simplified as：
Pp=2.31- (1.292-0.38ln Φ)=1.018+0.38ln Φ formulas 8
In step f, using offset well and the contrast of positive drilling well, with reference to stratum, lithology and stratum equal yield density, stratum is evaluated
Pressure, and draw the result map that strata pressure changes with well depth.The process evaluated strata pressure is as follows：
1) model of the formula 2 of porosity is explained using Sonic Logging Data, porosity is tried to achieve；
2) calculating of extrapolation formula 4 set up is returned using offset well or coring data and obtains rock burden pressure；
3) effective stress is calculated using formula 4 by porosity；
4) overburden pressure determines strata pressure with vertical effective stress.
The determination method for the strata pressure that the embodiment is provided can improve the precision of prediction of formation pressure, pass through offset well sound
Ripple log parameter more accurately predicts strata pressure before brill, for well structure design and balanced pressure drilling provide according to
According to；And the real-time monitoring of strata pressure, the acoustic logging parameter gathered in real time using underground LWD and MWD, by fax system can be realized
System is sent to ground, and can in time note abnormalities strata pressure in drilling process, it is ensured that downhole safety；It may also adapt to various
The geological environment of change, conventional method is normally only applied to mud shale stratum, and the determination method that the embodiment is provided has to mud stone
The evaluating ability of other lithologic character stratum pressure, can calculate marine facies carbonate formation pressure in addition；And with directly calculating ground
The ability of stressor layer, conventional method needs to set up normal compaction trend line, can be not required to set up normal compaction using the present invention and
Gesture line, it is possible to directly calculate strata pressure.
The formation pressure sections of the 8 mouthfuls of wells provided using above-mentioned embodiment certain work area are analyzed, process
It is as follows：
Work area drilling well well-log information and MWD, LWD Measurement While Drilling Data of positive drilling well are collected, interior use includes well depth, sound wave
Well logging, density log parameter.
(1) overburden pressure is calculated
Overburden pressure to work area drilling well is obtained by being integrated calculating to density of earth formations.Typical stratum is close
Degree is obtained by wireline logging, can also utilize the density of rock core.Positive drilling well is in the layer without density log or logging quality difference
The empirical regression formula of Duan Liyong formula 3 is extrapolated, and is obtained：
σz=1.95+0.125H formulas 9
(2) strata pressure is calculated
The purpose of strata pressure evaluation is to determine pressure that the fluid in the formation pore of different depth is born.
The first step calculates porosity using formula 2；Second step calculates strata pressure using formula 8.
It is computed 8 mouthfuls of work area well interval transit time and porosity has no obvious skew, is estimated using acoustic logging data on work area
The strata pressure of portion's well section is normal pressure coefficient (1.03-1.05g/cm3), somewhere shale formation pressure coefficient 1.09~
1.10g/cm3Left and right, formation pore pressure coefficient 0.96g/ is surveyed when reservoir somewhere shale gas pressure break is tested in one of 8 mouthfuls of wells
cm3。
Pressure value and observed pressure value are contrasted after testing, and formation pressure calculation precision of the present invention is up to more than 90%.This method
It is the basis according to well logging data, establishes the relation of strata pressure and well log interpretation porosity, while using there is effect
Power model directly calculates strata pressure, it is possible to set up the new method that corresponding strata pressure evaluates achievement section.Pass through scene
Checking, the need for its accuracy of detection can meet drilling engineering, this method is a kind of breakthrough asked for strata pressure.
It should be noted that accompanying drawing flow chart though it is shown that logical order, but in some cases, can be with
Shown or described step is performed different from order herein.
Present invention also provides a kind of storage medium, the storage medium includes the program of storage, wherein, when program is run
Equipment performs the determination method of the strata pressure of the present invention where controlling storage medium.
Present invention also provides a kind of processor, the processor is used for operation program, wherein, program performs this hair when running
Bright determination method.
Present invention also provides a kind of embodiment of the determining device of strata pressure.
Fig. 2 is a kind of schematic diagram of the determining device of optionally stressor layer according to embodiments of the present invention, such as Fig. 2 institutes
Show, the device includes acquiring unit 10, computing unit 20, the first determining unit 30 and the second determining unit 40.
Acquiring unit, for obtaining the well logging data in the first well depth；Computing unit, for based on the first well depth
Well logging data calculate the rock porosity and overburden pressure in the first well depth；First determining unit, exists for basis
The rock porosity of first well depth determines the vertical effective stress in the first well depth；Second determining unit, for according to first
The vertical effective stress and overburden pressure of well depth determine the strata pressure in the first well depth.Wherein, well logging data are
Wait to log well or be acquired obtained well logging data with the adjacent well of waiting to log well, or or according to treat well logging and/
Or the data that the well logging data collected with the adjacent well of waiting to log well are determined.
The embodiment obtains the well logging data in the first well depth by acquiring unit, and computing unit is based on the first well depth
Well logging data calculate the first well depth rock porosity and overburden pressure；First determining unit is according to first
The rock porosity of well depth determines the vertical effective stress in the first well depth；Second determining unit is according in the vertical of the first well depth
Effective stress and overburden pressure determine the strata pressure in the first well depth, solve strata pressure in correlation technique really
The method of determining can not be applied in the different regional technical problem of formation strength, and then realizes the stratum that can determine that intensity is different
Strata pressure technique effect.
Alternatively, in the case where well logging data include well depth and density of earth formations, computing unit can be used for：Extract
The value and the density of earth formations in the first well depth of the first well depth included in the well logging data of the first well depth；Referred to using default
Number formula and with the first well depth and the first well depth density of earth formations determine the first well depth overburden pressure.
Alternatively, the second determining unit can be used for：Utilize strata pressure and vertical effective stress and overburden pressure
Relational expression determine the ground lamination in the first well depth corresponding with the vertical effective stress and overburden pressure in the first well depth
Power, wherein, the relational expression of strata pressure and vertical effective stress and overburden pressure is built in advance based on effective stress theorem
Vertical relational expression.
Alternatively, in the case of the interval transit time that well logging data include the acoustic wave of rock time difference and rock matrix, the
One determining unit can be used for：Calculated using equation below：Wherein, Φ is rock porosity, and Δ T is rock
Stone interval transit time and unit are μ s/m, Δ TmaIt is μ s/m for the interval transit time and unit of rock matrix, f is sound wave formation capacity.
Alternatively, the first determining unit can be calculated using equation below：Wherein, σeIt is vertical
Straight effective stress, Φ0For the rock porosity of earth's surface, β is compacting factor.
Alternatively, the second determining unit can be calculated using equation below：Pp=σz-σeWherein, PpFor strata pressure, σzFor
Overburden pressure.
Alternatively, the device can also include：Logic unit, for obtaining the well logging data of different well depths with respectively
Determine the strata pressure of different well depths, drawing unit, for drawing strata pressure with well depth according to the strata pressure of different well depths
The curve of change.
Above-mentioned device can include processor and memory, and said units can be stored in storage as program unit
In device, corresponding function is realized by the said procedure unit of computing device storage in memory.
Memory potentially includes the volatile memory in computer-readable medium, random access memory (RAM) and/
Or the form, such as read-only storage (ROM) or flash memory (flash RAM) such as Nonvolatile memory, memory is deposited including at least one
Store up chip.
The order of above-mentioned the embodiment of the present application does not represent the quality of embodiment.
In above-described embodiment of the application, the description to each embodiment all emphasizes particularly on different fields, and does not have in some embodiment
The part of detailed description, may refer to the associated description of other embodiment.In several embodiments provided herein, it should be appreciated that
Arrive, disclosed technology contents can be realized by another way.
Wherein, device embodiment described above is only schematical, such as division of described unit, can be one
Kind of division of logic function, can there is other dividing mode when actually realizing, such as multiple units or component can combine or
Another system is desirably integrated into, or some features can be ignored, or do not perform.It is another, it is shown or discussed it is mutual it
Between coupling or direct-coupling or communication connection can be the INDIRECT COUPLING or communication link of unit or module by some interfaces
Connect, can be electrical or other forms.
In addition, each functional unit in the application each embodiment can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units it is integrated in a unit.Above-mentioned integrated list
Member can both be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.
If the integrated unit is realized using in the form of SFU software functional unit and as independent production marketing or used
When, it can be stored in a computer read/write memory medium.Understood based on such, the technical scheme of the application is substantially
The part contributed in other words to prior art or all or part of the technical scheme can be in the form of software products
Embody, the computer software product is stored in a storage medium, including some instructions are to cause a computer
Equipment (can for personal computer, server or network equipment etc.) perform the application each embodiment methods described whole or
Part steps.And foregoing storage medium includes：USB flash disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), mobile hard disk, magnetic disc or CD etc. are various can be with store program codes
Medium.
Described above is only the preferred embodiment of the application, it is noted that for the ordinary skill people of the art
For member, on the premise of the application principle is not departed from, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as the protection domain of the application.
Claims (10)
1. a kind of determination method of strata pressure, it is characterised in that including：
Obtain the well logging data in the first well depth；
Well logging data based on first well depth calculate the rock porosity and overlying rock pressure in first well depth
Power；
The vertical effective stress in first well depth is determined according to the rock porosity in first well depth；
Determine to be laminated on the ground of first well depth according to the vertical effective stress in first well depth and overburden pressure
Power.
2. according to the method described in claim 1, it is characterised in that the well logging data include well depth and density of earth formations,
Well logging data calculating based on first well depth includes in the overburden pressure of first well depth：
It is extracted in the value for first well depth that the well logging data of first well depth include and in first well depth
Density of earth formations；
Determined using default exponential formula and with first well depth and in the density of earth formations of first well depth described first
The overburden pressure of well depth.
3. according to the method described in claim 1, it is characterised in that according to the vertical effective stress in first well depth and upper
Overlying strata stressor layer determines to include in the strata pressure of first well depth：
Determined and hanging down in first well depth using the relational expression of strata pressure and vertical effective stress and overburden pressure
Straight effective stress and the corresponding strata pressure in first well depth of overburden pressure, wherein, the strata pressure is with hanging down
The relational expression of straight effective stress and overburden pressure is the relational expression pre-established based on effective stress theorem.
4. according to the method described in claim 1, it is characterised in that the well logging data include the acoustic wave of rock time difference and rock
The interval transit time of stone skeleton, the well logging data based on first well depth calculate the rock porosity in first well depth
Calculated using equation below：
Wherein, Φ is rock porosity, and Δ T is the acoustic wave of rock time difference and unit is μ s/m, Δ TmaFor the rock matrix
Interval transit time and unit is μ s/m, f is sound wave formation capacity.
5. method according to claim 4, it is characterised in that determined according to the rock porosity in first well depth
The vertical effective stress of first well depth is calculated using equation below：
Wherein, σeFor vertical effective stress, Φ0For the rock porosity of earth's surface, β is compacting factor.
6. method according to claim 5, it is characterised in that according to the vertical effective stress in first well depth and upper
Overlying strata stressor layer determines to calculate using equation below in the strata pressure of first well depth：
Pp=σz-σe
Wherein, PpFor strata pressure, σzFor overburden pressure.
7. according to the method described in claim 1, it is characterised in that methods described also includes：
The well logging data of different well depths are obtained to determine the strata pressure of different well depths respectively；
The curve that strata pressure changes with well depth is drawn according to the strata pressure of the different well depths.
8. a kind of determining device of strata pressure, it is characterised in that including：
Acquiring unit, for obtaining the well logging data in the first well depth；
Computing unit, the rock porosity in first well depth is calculated for the well logging data based on first well depth
And overburden pressure；
First determining unit, for determining have in the vertical of first well depth according to the rock porosity in first well depth
Efficacy；
Second determining unit, for being determined according to the vertical effective stress and overburden pressure in first well depth described
The strata pressure of first well depth.
9. a kind of storage medium, it is characterised in that the storage medium includes the program of storage, wherein, in described program operation
When control the storage medium where strata pressure in equipment perform claim requirement 1 to 7 described in any one determination method.
10. a kind of processor, it is characterised in that the processor is used for operation program, wherein, right of execution when described program is run
Profit requires the determination method of the strata pressure described in any one in 1 to 7.
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| CN108150160A (en) * | 2017-12-21 | 2018-06-12 | 西安石油大学 | The acquiring method of low compaction superpressure in a kind of stratum |
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| CN111927445A (en) * | 2020-09-06 | 2020-11-13 | 中国石油天然气集团有限公司 | Method for obtaining formation pressure while drilling based on fitting logging parameters of while-drilling rock and ore data |
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