CN107269269A - The quick look method of unconformable strata layer position - Google Patents
The quick look method of unconformable strata layer position Download PDFInfo
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- 238000012706 support-vector machine Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 4
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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 present invention provides a kind of quick look method of unconformable strata layer position, and the quick look method of unconformable strata layer position includes：Step 1, the fine sand division of individual well is carried out to drilling well；Step 2, fine composite seismogram calibration is carried out；Step 3, the time gradient of index bed control is obtained；Step 4, calculate window algorithm fitting when becoming and become the time difference；Step 5, the automatic explanation of unconformable strata is carried out.Window digital simulation automatic tracing unconformable strata during the change that the quick look method of unconformable strata layer position is controlled using reference lamina, pass through the unconformable strata of party's method interpretation, as a result it is more objective, accurate, and operating efficiency is effectively raised, reduce the error of explanation.
Description
Technical field
The present invention relates to oil field development technical field, a kind of unconformable strata layer position is especially related to
Quick look method.
Background technology
With going deep into for Subtle reservoir exploration, degree of prospecting more and more higher is explored also more and more finer
Change, stratigraphic oil pool status shared in exploration is more and more important.Stratigraphic unconformity trap is due to forming
The disguise that condition and its configuration relation are diversified, in irregular shape, bury and be distributed, or reservoir
Extremely complicated property the features such as, its find difficulty it is more much bigger than structural deposit, stratigraphic trap
Typical the characteristics of be to plane of unconformity direction reservoir it is gradually convergent, using conventional ground it is normal when window point
Analysis can cause bottom when wearing or leakage, therefore restriction stratigraphic oil pool description key be exactly that can reflect ground
The layer position of layer reservoir actual thickness change, explains that unconformable strata position is a huge engineering.To not whole
The layer position for closing stratum explains generally there are three kinds of methods, and (1) is explained by hand：Because convergence stratum is relatively thin,
Earthquake axle poor continuity, follows the trail of and explains that difficulty is big, efficiency is low, does not catch up with rhythm of production；(2) stratum
Microtomy：Because the relative ratios of each well unconformable strata thickness change greatly, there is larger error；
(3) interpolation：The layering demarcated according to well carries out interpolation, due to lacking the control of reference lamina, causes
The few area of well, near Faults and work area edge error are big.In this regard, proposing a kind of unconformable strata position certainly
Dynamic computational methods, the time gradient between the drilling well controlled using reference lamina is not whole to calculate gains in depth of comprehension automatically
Close layer position.
The difficult point of stratigraphic oil pool description be super wire stripping it is accurate portray and sandstone reservoir earth thing
Reason description, and the key issue for restricting the geophysics description of sandstone reservoir is exactly the fast of unconformable strata position
It is fast accurately to explain, the drawbacks of having larger due to conventional layer position interpretation technique, therefore, in reality
All it is to carry out geophysics description from solid timing window control in work, and actual unconformable strata
Really convergence change, analyzed using solid timing window will necessarily cause that layer description is when wearing or leakage
Problem, so as to cause the inaccurate of description.For this, we have invented a kind of new unconformable strata layer
The quick look method of position, solves above technical problem.
The content of the invention
It is an object of the invention to provide a kind of under fine composite seismogram calibration, pass through the control of index bed
System, obtains time residual values, and unconformable strata is calculated with window computational methods when becoming it is not whole
Close the quick look method of stratigraphic horizon.
The purpose of the present invention can be achieved by the following technical measures：The quick solution of unconformable strata layer position
Method is released, the quick look method of unconformable strata layer position includes：Step 1, drilling well is carried out
The fine sand division of individual well；Step 2, fine composite seismogram calibration；Step 3, standard is obtained
The time gradient of layer control；Step 4, window algorithm fitting becomes the time difference during change；Step 5, unconformable strata
Automatic Fitting explain.
The purpose of the present invention can be also achieved by the following technical measures：
In step 1, binding work area real data, by fine correlation of horizons, considers simultaneously
Stratum sand body genesis analysis, cross connection situation, are divided to the unconformable strata in research work area,
Each well in research work area is finely divided according to unconformable strata.
In step 2, the seismic reflection lineups of unconformable strata are identified from seismic profile,
To distinguish other axis of reflection, the reflection line-ups of time-domain in the reservoir of Depth Domain and earthquake have been contacted
Come, by demarcation, set up different lithology, the corresponding relation of electrical stratum and Seismic reflection character,
Obtain the time value of the unconformable strata of each well.
In step 3, it is standard key-course to choose a significant layer position, from known unconformity
Super stripping point set out, under index bed control, subtract each other with each individual well time value and obtain the time difference, it is and each
Drawing lines difference between well is divided by the time gradient for obtaining line direction and road direction.
In step 4, according to actual geological condition, differentiate and degrade unconformity and overlap unconformity stratum
Developmental state, according to window algorithm when becoming, calculates the change time difference under time gradient control, obtains not
The change time difference layer position of conformable strata.
In steps of 5, under index bed control, the change time difference layer of index bed and unconformable strata is utilized
Position is combined, and the layer position of unconformable strata is obtained using algorithm of support vector machine automatic Fitting.
The quick look method of unconformable strata layer position in the present invention, in fine composite seismogram calibration
Under, by the control of index bed, time residual values are obtained, and with window computational methods when becoming to unconformity
Layer position carries out digital simulation automatic tracing unconformable strata, by the unconformable strata of party's method interpretation,
As a result it is more objective, accurate, and operating efficiency is effectively raised, the error of explanation is reduced,
Solid foundation is established for the layer description research of stratigraphic oil pool, also by for subtle pool target
Prediction and exploration are offered reference and referred to, and a set of simple and effective convergence ground is provided for geological research personnel
The means of interpretation of layer.
Brief description of the drawings
Fig. 1 is the stream of a specific embodiment of the quick look method of the unconformable strata layer position of the present invention
Cheng Tu；
Fig. 2 degrades stratigraphic horizon in the specific embodiment for the present invention explains principle schematic；
Fig. 3 explains principle schematic for onlap stratigraphic horizon in the specific embodiment of the present invention；
Fig. 4 shows for unconformable strata layer position quick look result plane in the specific embodiment of the present invention
It is intended to.
Embodiment
It is cited below particularly to enable the above and other objects, features and advantages of the present invention to become apparent
Go out preferred embodiment, and coordinate shown in accompanying drawing, be described in detail below.
As shown in figure 1, flows of the Fig. 1 for the quick look method of the unconformable strata layer position of the present invention
Figure.
In step 101, the fine sand division of individual well.
Consider in research range deposition event or the developmental state on stratum in same unconformable strata, with reference to
Work area real data is studied, by fine correlation of horizons, while considering stratum sand body genesis analysis, horizontal stroke
To connection situation, the unconformable strata in research work area is divided, each well in research work area is pressed
It is finely divided according to unconformable strata.
In step 102, fine composite seismogram calibration.
The seismic reflection lineups of unconformable strata are that country rock has difference of impedance above and below plane of unconformity
Formed by.Fine calibration is exactly that the seismic reflection lineups of unconformable strata are known from seismic profile
Do not come out, to distinguish other axis of reflection, it can by the reservoir of Depth Domain and earthquake time-domain it is anti-
Lineups are penetrated to connect.By demarcation, different lithology, electrical stratum and earthquake can be set up anti-
Penetrate the corresponding relation of feature.Finally give the time value of the unconformable strata of each well.
In step 103, the time gradient of index bed control.
It is standard key-course to choose a significant layer position, is pointed out from known unconformable super stripping
Hair, under index bed control, subtracts each other with each individual well time value and obtains the time difference, with the drawing lines between each well
Number difference, which is divided by, obtains the time gradient Line_G and Cdp_G in line direction and road direction.
In step 104, change, window algorithm fitting becomes the time difference.
Window algorithm during by becoming, calculates the change time difference under time gradient control, with obtaining unconformity
The change time difference layer position of layer.
1) unconformity is degraded
For degrading unconformity, as shown in Fig. 2 by key-course position h and by real drilling time gradient
Residual error layer position Δ h' is obtained, and unconformity is degraded by combining acquisition with plane of unconformity unconformity
Layer position hx.By it is known it is unconformable degrade a little as a reference point, (Line at the x of arbitrfary point is derived firstx,
Cdpx) relative to reference point (Line0,Cdp0) time residual error：
Δ h'={ [(Linex-Line0)*Line_G]2+(Cdpx-Cdp0)*Cdp_G]2}1/2 (1)
Then it is i.e. available by key-course position h and the unconformable strata position of time residual error layer position control:
Wherein:Line0,Cdp0Reference point drawing lines number；Linex,CdpxArbitrfary point drawing lines number；Line_G lines
Direction time gradient；Cdp_G roads direction time gradient, Δ h is key-course position and plane of unconformity at reference point
Between layer potential difference value.hxWhat window calculating was obtained when exactly by becoming degrades unconformable strata position.
2) overlap unconformity
Similarly, for overlap unconformity, as shown in figure 3, overlap unconformity layer position is with degrading unconformity
Computing Principle is identical, and simply layer position in unconformable strata is calculated downwards by key-course position.Known unconformity
Onlap point it is as a reference point, derive (Line at the x of arbitrfary pointx,Cdpx) relative to reference point (Line0,
Cdp0) time residual error：
Δ h'={ [(Linex-Line0)*Line_G]2+(Cdpx-Cdp0)*Cdp_G]2}1/2
Then it is i.e. available by key-course position h and the unconformable strata position of time residual error layer position control
In step 105, the automatic explanation of unconformable strata.
Under index bed control, combined using the change time difference layer position of index bed and unconformable strata, finally
Using SVMs (Support Vector Machine, SVM), automatic Fitting is with obtaining unconformity
The layer position of layer, as shown in figure 4, interpretation horizon edge is degraded line and extended to lower location of the structure, structural relief
And Distribution Characteristics meet actual geological knowledge.
Basic thought for the SVMs of nonlinear regression is fixed by using interior Product function
The input space is transformed to a higher dimensional space by the nonlinear transformation of justice, then in this higher dimensional space
Find a kind of linear relationship between input variable and output variable.Algorithm of support vector machine is one convex
Double optimization problem, it is ensured that the solution found is globally optimal solution and can preferably solve small sample, non-thread
Property, the practical problem such as high dimension, particularly its small-sample learning ability will be far superior to traditional nerve
Network.Flow terminates.
The quick look method of unconformable strata layer position in the present invention, based on drilling well and index bed control
System, digital simulation automatic tracing unconformity is carried out using window computational methods when becoming to unconformable strata position
Layer, on the one hand improves the efficiency that layer position is explained, on the other hand overcomes conventional layer position tracing algorithm and exists
The problem of unconformable strata is worn layer when following the trail of.By the unconformable strata of party's method interpretation, as a result more
It is objective, accurate, and operating efficiency is effectively raised, the error of explanation is reduced, is formation oil
Solid foundation has been established in the layer description research of Tibetan, for the prediction of subtle pool target and will also be surveyed
Spy is offered reference and referred to, and the explanation on a set of simple and effective convergence stratum is provided for geological research personnel
Method.
Claims (6)
1. the quick look method of unconformable strata layer position, it is characterised in that the quick look method of unconformable strata layer position includes：
Step 1, the fine sand division of individual well is carried out to drilling well；
Step 2, fine composite seismogram calibration is carried out；
Step 3, the time gradient of index bed control is obtained；
Step 4, calculate window algorithm fitting when becoming and become the time difference；
Step 5, the automatic explanation of unconformable strata is carried out.
2. the quick look method of layer position in unconformable strata according to claim 1, it is characterized in that, in step 1, binding work area real data, pass through fine correlation of horizons, stratum sand body genesis analysis, cross connection situation are considered simultaneously, the unconformable strata in research work area is divided, and each well in research work area is finely divided according to unconformable strata.
3. the quick look method of layer position in unconformable strata according to claim 1, it is characterized in that, in step 2, the seismic reflection lineups of unconformable strata are identified from seismic profile, to distinguish other axis of reflection, the reflection line-ups of time-domain in the reservoir of Depth Domain and earthquake are connected, pass through demarcation, set up different lithology, the corresponding relation of electrical stratum and Seismic reflection character, obtain the time value of the unconformable strata of each well.
4. the quick look method of layer position in unconformable strata according to claim 1, it is characterized in that, in step 3, it is standard key-course to choose a significant layer position, from known unconformable super stripping point, under index bed control, subtract each other with each individual well time value and obtain the time difference, the drawing lines difference between each well is divided by the time gradient for obtaining line direction and road direction.
5. the quick look method of layer position in unconformable strata according to claim 1, it is characterized in that, in step 4, according to actual geological condition, differentiate and degrade unconformity and overlap unconformity stratum developmental state, according to window algorithm when becoming, the change time difference under time gradient control is calculated, the change time difference layer position of unconformable strata is obtained.
6. the quick look method of layer position in unconformable strata according to claim 1, characterized in that, in steps of 5, under index bed control, combined using the change time difference layer position of index bed and unconformable strata, the layer position of unconformable strata is obtained using algorithm of support vector machine automatic Fitting.
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| CN110618451A (en) * | 2019-09-17 | 2019-12-27 | 太原理工大学 | Method for detecting seismic exploration weak signal based on NARX neural network |
| CN110984979A (en) * | 2020-01-06 | 2020-04-10 | 中国石油化工股份有限公司 | Grid design method for angle-unconformity oil reservoir modeling digital-analog |
| CN111075440A (en) * | 2019-11-26 | 2020-04-28 | 中国石油天然气股份有限公司 | Unconformity oil and gas reservoir scale prediction method and device |
| CN113419277A (en) * | 2021-06-21 | 2021-09-21 | 大庆油田有限责任公司 | Quality control method of seismic interpretation horizon based on fall gradient attribute |
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