CN108121009A - Development late stage complex fault block velocity-variant depth mapping method - Google Patents
Development late stage complex fault block velocity-variant depth mapping method Download PDFInfo
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- G—PHYSICS
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. for interpretation or for event detection
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Abstract
The present invention provides a kind of development late stage complex fault block velocity-variant depth mapping method, including：Step 1, the interval velocity of individual well is obtained by seismic interpretation layer position and geological layering；Step 2, extraction can reflect the edge layer seismic properties of variation of lithological, and attributed graph with T0 figures is waited to be superimposed；Step 3, the speed point in region is unevenly distributed based on the consistent principle encryption Wu Jing of the formation velocity at identical lithology and same time and well；Step 4, using seismic interpretation layer position be trend surface and fault boundary be interpolation border to individual well interval velocity into row interpolation, establish two-dimensional layer velocity field；Step 5, time and depth transfer is done with T0 grids is waited to be multiplied using the two-dimentional interval velocity grid of generation, obtains final structural map.This method provides accurate basic guide for Study on residual oil distribution and the well pattern restructuring of complex fault block meticulous pool description, has directive function to the later development of such oil reservoir, popularizing application prospect is wide, remarkable economic and social benefits.
Description
Technical field
The present invention relates to complex fault block meticulous pool description fields, especially relate to a kind of development late stage complex fault block and become
Fast tectonic ore-forming method.
Background technology
Complex fault block by lithology, terrain configuration and fracture system due to being influenced, formation velocity longitudinal direction, horizontal stroke in more regions
It is larger to velocity variations, and development late stage is higher to tectonic ore-forming precision, is fitted using individual well average speed or more wells public
The error that formula is carried out on the structural map and well of time and depth transfer is larger, it is impossible to meet required precision, it is necessary to using velocity-variant depth mapping.
It is relatively more to the research of variable speed mapping method at present, mainly have from well point speed interpolation velocity field and ask for three from stack velocity
Tie up average velocity field both.It is wherein diluter in the uneven or well spacing density of well point from the method for individual well speed interpolation velocity field
The velocity variations rule of underground cannot be showed in thin work area exactly；From stack velocity field computation three-dimensional average velocity in Wu Jing
In the case of more can truly show the changing rule of subsurface velocities field.However, this calculate three-dimensional velocity from stack velocity
The method of field is more troublesome, and structure interpretation personnel are that do not have stack velocity data under normal circumstances, and what can be done is exactly from well
Spot speed calculating speed field.Although the fault block oil reservoir well of development late stage is more, the method for well point speed interpolation velocity field is in well
Less, well be unevenly distributed, there are tomography local interpolation precision it is inadequate；Therefore, it is this in the place that craven fault and stratum change
The speed that method calculates cannot really show subsurface velocities variation characteristic, can cause structural configuration distortion after time and depth transfer.For
This solves more than technical problem we have invented a kind of new development late stage complex fault block velocity-variant depth mapping method.
The content of the invention
The object of the present invention is to provide it is a kind of using with the encryption of the well interval velocity of fixed well same time and lithology without well and
Well is unevenly distributed the speed point in region, and well point speed difference velocity field under seismic horizon and fault boundary constraint is opened
Send out later stage complex fault block velocity-variant depth mapping method.
The purpose of the present invention can be achieved by the following technical measures：Development late stage complex fault block velocity-variant depth mapping side
Method, the development late stage complex fault block velocity-variant depth mapping method include：Step 1, obtained by seismic interpretation layer position and geological layering
Obtain the interval velocity of individual well；Step 2, extraction can reflect the edge layer seismic properties of variation of lithological, and attributed graph with T0 figures is waited to be superimposed；
Step 3, region is unevenly distributed based on the consistent principle encryption Wu Jing of the formation velocity at identical lithology and same time and well
Speed point；Step 4, it is trend surface using seismic interpretation layer position and fault boundary is that individual well interval velocity is inserted on interpolation border
Value, establishes two-dimensional layer velocity field；Step 5, time and depth transfer is done with T0 grids is waited to be multiplied using the two-dimentional interval velocity grid of generation, obtained
To final structural map.
The purpose of the present invention can be also achieved by the following technical measures：
In step 1, on the basis of completing whole district's fine reservoir prediction, layer position and tomography and being closed explanation, reading layer position
The time value of the corresponding seismic interpretation layer position of geologic horizon for the individual well that calibration is accurate and hole deviation is errorless, and utilize the layering on well
Depth and the time value of reading calculate individual well interval velocity.
In step 2, research layer variation of lithological is analyzed, and extracts the edge layer earthquake category that can reflect variation of lithological
Property, while the T0 figures such as generation, attributed graph with waiting T0 figure overlappings.
In step 3, local enciphering rate point unevenly distributed to no well or well, which sought in the whole district
It looks for and needs lithology at encryption and interval velocity of the interval velocity of fixed well that the seismic horizon time is all identical as the point.
In step 4, it is trend surface to wait T0 figures, using fault line as interpolation border, two dimension is carried out to individual well point interval velocity
Gridding generates two-dimentional interval velocity；Using minimum trend gridding interpolation method during interpolation, using well point speed as seed
Point, using seismic interpretation layer position as trend between 2 points, interpolation terminates when running into fault line.
Development late stage complex fault block velocity-variant depth mapping method in the present invention, utilizes variation of lithological and seismic interpretation layer position
With the variable speed mapping method of the well point interpolation speed field under tomography co- controlling, depth relation and the completion whole district when implementing the whole district
On the basis of structure interpretation, lateral speed change, well for complex fault block be unevenly distributed, more than tomography and without stack velocity,
It is mainly the variation caused by lithology, structural configuration and tomography from analysis complex fault block subsurface velocities, utilizes identical rock
The speed of the fixed well of property and same time is unevenly distributed the speed point of block to encrypt Wu Jing and well, and with seismic interpretation layer
Position and fault boundary are constraints interpolation individual well interval velocity, so as to carry out variable speed mapping.It this method solve due to well quantity
It is limited, be unevenly distributed, tomography it is more, ask for the problem of velocity field is inaccurate using individual well interval velocity, do not folded by this method
It more can truly show the cross directional variations rule of underground horizon velocity in the case of acceleration, particularly in well distribution not
, the difference of speed can be highlighted in the case that tomography is more, formation variation is fast.The inventive method can effectively improve complex fault block speed change
Mapping precision, and it is simple and practical.The technological invention is the Study on residual oil distribution of complex fault block meticulous pool description and opens
It sends out well pattern reformation and accurate basic guide is provided, there is directive function, popularizing application prospect to the later development of such oil reservoir
It is wide, remarkable economic and social benefits.
Description of the drawings
Fig. 1 is the flow chart of a specific embodiment of the development late stage complex fault block velocity-variant depth mapping method of the present invention；
Deep friendship remittance analysis chart when Fig. 2 is the 84 mouthfuls of wells in work area in a specific embodiment of the invention；
Fig. 3 is the RMS amplitude attribute and interpretation horizon extracted in the specific embodiment of the present invention along 10MS above and below layer
Wait T0 overlapping figures；
Fig. 4 is enciphering rate point position and corresponding fixed well signal and overlapping (attribute in a specific embodiment of the invention
With waiting T0) figure；
Fig. 5 is two-dimentional interval velocity grid chart in a specific embodiment of the invention；
Fig. 6 is variable speed structure figure in a specific embodiment of the invention.
Specific embodiment
For enable the present invention above and other objects, features and advantages be clearer and more comprehensible, it is cited below particularly go out preferable implementation
Example, and coordinate shown in attached drawing, it is described in detail below.
As shown in Figure 1, Fig. 1 is the flow chart of the development late stage complex fault block velocity-variant depth mapping method of the present invention.
Step 101, on the basis of completing whole district's fine reservoir prediction, layer position and tomography and being closed explanation, reading layer position mark
The time value of the corresponding seismic interpretation layer position of geologic horizon of true and errorless hole deviation individual well is fixed, and it is deep using the layering on well
Degree and the time value read calculate individual well interval velocity, and step enters 102.
Step 102, research layer variation of lithological is analyzed, and extracts the edge layer seismic properties that can reflect variation of lithological,
The T0 such as generation figures simultaneously, attributed graph with T0 figures is waited to overlap, step enters 103.
Step 103, local enciphering rate point unevenly distributed to no well or well, the encryption method are found in the whole district
With needing the interval velocity of lithology at encryption and the interval velocity of seismic horizon time all identical fixed well as the point, step into
Enter 104.
Step 104, be trend surface to wait T0 figures, fault boundary is interpolation border to the interval velocity of individual well point into row interpolation,
Interval velocity grid is generated, step enters 105.
Step 105, interval velocity grid is done time and depth transfer with T0 grids is waited to be multiplied, flow terminates.
The technology of the present invention is on the basis of whole district's fine reservoir prediction and whole district's closed structure explanation is completed, after exploitation
Phase complex fault-block structure is into figure problems faced and needs and in view of the velocity field that conventional individual well interpolation obtains cannot really show
The variation of complex fault block underground horizon velocity, place unevenly distributed to Wu Jing and well is using known to identical lithology and time
Well point speed is encrypted as the spot speed, at the same using the variation tendency of seismic interpretation layer position as constraint, using fault boundary as
Interpolation border is to whole district's speed point into row interpolation；It so ensures that there is speed point control in the whole district, is establishing interval velocity field
When using well point speed as seed point, it is disconnected when running into the variation tendency of seismic interpretation layer position into row interpolation between two well points
Interpolation terminates when layer line.The present invention utilizes identical lithology and the formation velocity one of the same seismic reflection layer position of same time
Then the principle of cause, place unevenly distributed to Wu Jing and well recycle seismic interpretation with fixed well speed enciphering rate point
The time trend of layer position constrains individual well interval velocity interpolation so that well point interpolation grid more can truly show underground
The variation of interval velocity field, and it is simple and practical.
In the specific embodiment of the application present invention, example 1 is positioned at the northern Complex Fault Block Oil Reservoir of Gudong field, quilt
The fracture of two groups of Near East Xi Hejin north-souths is mutually cut, and forms multiple small fault blocks, research range 27Km2,84 mouthfuls of wells.Study layer
Section SHAHEJIE FORMATION overlap of beds is coated on Gu Dong buried hill, and formation thickness changes greatly, and Oil Reservoir Types are predominantly by tomography control
The fault block of system and disconnected nose oil reservoir.Presently, there are the problem of mainly have and verify oil domain and current construction mismatch, fault block is drawn
Point not fine, the nose that breaks, micro-structure development but fulfilling degree are low etc..
(1), it is deep when being done to all wells of whole district's horizon calibration on the basis of whole district's horizon calibration and fine structural interpretation
Cross figure (Fig. 2) and the analysis of browsed well profile, checks whether there is calibration inaccuracy and the well there are hole deviation.Then reading layer position is marked
Time value of the geological layering of true and errorless hole deviation individual well on seismic interpretation layer position is fixed, and utilizes the depth of seam division on well
And the time value read calculates individual well interval velocity.
(2), the lithologic character of earthquake interpretation horizon is analyzed, and extracts and can reflect that this layer of lithology sea level changes are special
The RMS amplitude attribute of sign, while the T0 isograms such as interpretation horizon generation are overlapped (Fig. 3) with attributed graph.
(3) to no well area and well region unevenly distributed, lithology identical at this and identical is found out from overlapping figure
Speed enciphering rate point (Fig. 4, table 1) of the interval velocity of the fixed well of time as the point.
Enciphering rate point and fixed well information table in 1 example 1 of table
(4) it is trend surface to wait T0 figures, using fault line as interpolation border, two-dimensional mesh is carried out to individual well point interval velocity and is formatted,
The two-dimentional interval velocity (Fig. 5) of generation.Using minimum trend gridding interpolation method during interpolation, using well point speed as seed
Point, using seismic interpretation layer position as trend between 2 points, interpolation terminates when running into fault line.
(5) time and depth transfer is done with T0 grids is waited to be multiplied using the two-dimentional interval velocity grid of generation, obtains final structural map
(Fig. 6).
The speed in region is unevenly distributed by using identical lithology and the fixed well spot speed of time encryption Wu Jing and well
Point, and the individual well speed field energy using seismic interpretation layer position and tomography as constraints interpolation more really shows the variation of speed
Rule, the method is coincide preferably with being achieved in variable speed mapping in example 1 preferably with effect with well point depth, convex
The difference in height of micro-structure and craven fault upper lower burrs is shown.By being compared to whole district's well depth of seam division and variable speed structure figure depth
It analyzes (table 2).
Whole district's well depth of seam division and variable speed mapping depth correlation analytical table in 2 example 1 of table
84 mouthfuls of wells of the whole district, error are up to 5.71 meters, minimal error 0；Wherein error is more than 5 meters of Jing5Kou, accounts for
5.9%, Jing46Kou of the error between 5-1 meters account for 54.8%, and error is less than 1 meter of Jing33Kou, accounts for 39.3%.Fitting formula
Tectonic ore-forming and the worst error of depth on well are 25 meters, and error is more more than 5 meters of well, is carried using the variable speed mapping method
High structural map precision.Development late stage complex fault-block structure is 5 meters into most interval is schemed, and error is less than in the invention method
5 meters of probability is 94.1%, and precision is higher, disclosure satisfy that the needs of current complex fault-block structure mapping precision, and correct amount is smaller,
And this drawing methods speed is fast, easy to operate.
Development late stage complex fault block velocity-variant depth mapping method in the present invention, is by seismic interpretation layer position and ground first
Matter layering obtains the interval velocity of individual well；Then the edge layer seismic properties of variation of lithological can be reflected to the extraction of explanation of seismic layer position, and
Attributed graph with T0 figures is waited to be superimposed；Again to the equally distributed area of no well, found and lithology and time at pass point from the whole district
Speed of the interval velocity of all identical fixed well as the point；It is finally trend surface using seismic interpretation layer position and fault boundary is
Two-dimensional layer velocity field, into row interpolation, is established, so as to reach complex fault-block structure variable speed mapping in interpolation border to individual well interval velocity
Purpose.
Claims (5)
1. development late stage complex fault block velocity-variant depth mapping method, which is characterized in that the development late stage complex fault block variable speed structure
Drawing methods include：
Step 1, the interval velocity of individual well is obtained by seismic interpretation layer position and geological layering；
Step 2, extraction can reflect the edge layer seismic properties of variation of lithological, and attributed graph with T0 figures is waited to be superimposed；
Step 3, it is unevenly distributed based on the consistent principle encryption Wu Jing of the formation velocity at identical lithology and same time and well
The speed point in region；
Step 4, using seismic interpretation layer position be trend surface and fault boundary be interpolation border to individual well interval velocity into row interpolation, build
Vertical two-dimensional layer velocity field；
Step 5, time and depth transfer is done with T0 grids is waited to be multiplied using the two-dimentional interval velocity grid of generation, obtains final structural map.
2. development late stage complex fault block velocity-variant depth mapping method according to claim 1, which is characterized in that in step 1
In, on the basis of completing whole district fine reservoir prediction, layer position and tomography and being closed and explain, read that horizon calibration is accurate and hole deviation without
The time value of the corresponding seismic interpretation layer position of geologic horizon of individual well by mistake, and utilize the depth of seam division on well and the time of reading
Value calculates individual well interval velocity.
3. development late stage complex fault block velocity-variant depth mapping method according to claim 1, which is characterized in that in step 2
In, research layer variation of lithological is analyzed, and the edge layer seismic properties that can reflect variation of lithological are extracted, while the T0 such as generation
Figure, attributed graph with T0 figures is waited to overlap.
4. development late stage complex fault block velocity-variant depth mapping method according to claim 1, which is characterized in that in step 3
In, place enciphering rate point unevenly distributed to no well or well, the encryption method is to find and needed at encryption in the whole district
Lithology and seismic horizon time all identical fixed well interval velocity of the interval velocity as the point.
5. development late stage complex fault block velocity-variant depth mapping method according to claim 1, which is characterized in that in step 4
In, it is trend surface to wait T0 figures, using fault line as interpolation border, two-dimensional mesh is carried out to individual well point interval velocity and is formatted, generation two dimension
Interval velocity；Using minimum trend gridding interpolation method during interpolation, using well point speed as seed point, with ground between 2 points
Shake interpretation horizon is trend, and interpolation terminates when running into fault line.
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| CN111308549A (en) * | 2020-03-09 | 2020-06-19 | 中国石油化工股份有限公司 | Variable-speed mapping method based on model inversion |
| CN112068199A (en) * | 2020-09-07 | 2020-12-11 | 北京中恒利华石油技术研究所 | Plane section rapid fault interpretation method |
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| CN112068199B (en) * | 2020-09-07 | 2021-04-09 | 北京中恒利华石油技术研究所 | Plane section rapid fault interpretation method |
| CN113325474A (en) * | 2021-06-03 | 2021-08-31 | 西南石油大学 | Method for discriminating biological reef |
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