CN117148438A - Fracture-inclination-angle-based fault plugging oil-gas capability evaluation method - Google Patents
Fracture-inclination-angle-based fault plugging oil-gas capability evaluation method Download PDFInfo
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- CN117148438A CN117148438A CN202210566699.2A CN202210566699A CN117148438A CN 117148438 A CN117148438 A CN 117148438A CN 202210566699 A CN202210566699 A CN 202210566699A CN 117148438 A CN117148438 A CN 117148438A
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- 238000011156 evaluation Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 34
- 230000000903 blocking effect Effects 0.000 claims abstract description 12
- 239000004215 Carbon black (E152) Substances 0.000 claims description 12
- 229930195733 hydrocarbon Natural products 0.000 claims description 12
- 230000015572 biosynthetic process Effects 0.000 claims description 11
- 238000011160 research Methods 0.000 claims description 8
- 238000005553 drilling Methods 0.000 claims description 7
- 238000009933 burial Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 6
- 150000002430 hydrocarbons Chemical class 0.000 claims description 5
- 238000007789 sealing Methods 0.000 description 8
- 125000001183 hydrocarbyl group Chemical group 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 6
- 239000011435 rock Substances 0.000 description 6
- 238000011161 development Methods 0.000 description 4
- 238000012512 characterization method Methods 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000011158 quantitative evaluation Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01V1/30—Analysis
- G01V1/301—Analysis for determining seismic cross-sections or geostructures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V2210/00—Details of seismic processing or analysis
- G01V2210/60—Analysis
- G01V2210/64—Geostructures, e.g. in 3D data cubes
- G01V2210/642—Faults
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/40—Controlling or monitoring, e.g. of flood or hurricane; Forecasting, e.g. risk assessment or mapping
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- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention provides a fault plugging oil-gas capability evaluation method based on a section inclination angle in an extension basin, which comprises the following steps: step 1, determining the height h of the oil-gas of the forward fault of the oil reservoir; step 2, calculating true dip angles a of all forward faults; step 3, calculating stratum inclination angle b of the fault descent disc; step 4, determining a quantitative relation of the influence of the fault dip angle a and the stratum dip angle b on the oil-gas-containing height h; step 5, constructing a forward fault plugging evaluation parameter R; and 6, determining the range of the value range of R during forward fault blocking. The fault plugging oil and gas capability evaluation method based on the section inclination angle is based on three-dimensional seismic data, and is simple and convenient to apply, and fault and stratum morphology are fully achieved. The method can effectively evaluate the blocking characteristics of faults in the coverage area of the three-dimensional seismic data, and provides a new method for evaluating fault oil reservoirs.
Description
Technical Field
The invention relates to the technical field of oilfield exploration and development, in particular to a fault plugging oil gas capability evaluation method based on a section inclination angle.
Background
The structure and the structural lithologic trap which are widely developed in the eastern hydrocarbon-bearing basin of China and controlled by the forward fault are found by exploration practice, the fault block trap with reverse fault control has higher storage probability, and the fault block trap with forward fault control has relatively lower storage probability, so that the blocking property of the reverse fault is obviously superior to that of the forward fault. The plugging properties of forward faults therefore require further investigation. At present, the fault plugging property evaluation method mainly comprises a lithology butt joint method, a mudstone smearing method, an on-off coefficient method and the like, wherein the lithology butt joint method is difficult to quantify, has lower precision and has strong operability. The mudstone smearing method has multiple dissolubility, is not suitable for plugging evaluation of long-term movable faults, and has the problems of difficult parameter acquisition and poor operability in quantitative characterization methods such as fault start-stop coefficients and the like. Meanwhile, the methods mainly depend on drilling data, and in the zone pre-detection stage, the drilling data are less, so that the fault plugging property of the non-well zone or the less well zone is difficult to evaluate effectively.
Three-dimensional seismic data are widely used at present, and fault imaging is more and more accurate.
In application number: in the Chinese patent application of CN201911338406.X, a method for evaluating fault lateral blocking main control factors is related, and belongs to the technical field of oil and gas exploration. The method improves the existing lithology opposite calculation method, combines lithology smearing results, comprehensively evaluates main control factors of lateral blocking of faults in a research area, can provide reference for next drilling control, and effectively reduces exploration risks. The technical scheme comprises the steps of calculating the occupied ratio V1% of the opposite blocking of the fault lithology, the occupied ratio V2% of the plastic smearing blocking of the fault and the occupied ratio V3% of other factors, and judging the main control factors of the lateral blocking of the fault
In application number: in CN201610084904.6, a quantitative evaluation method for lateral sealing of faults is related. The fracture-storage displacement pressure difference method for quantitatively evaluating the fault sealing performance is improved under the condition of considering the fault bearing time based on the fault sealing mechanism and the influence factor research thereof, and a geological and mathematical model for quantitatively evaluating the fault sealing performance with consideration of time factors is established. And determining the burial depth of surrounding rock stratum rock with the same shale content and diagenetic degree as those of the target fault rock by adopting a given step length and successive approximation algorithm, quantitatively calculating the displacement pressure of the target fault stratum rock according to the relation between the product of the shale content and the burial depth and the displacement pressure established in a research area, comparing the displacement pressure of the target fault stratum rock with the displacement pressure of a target disc reservoir layer, and quantitatively evaluating whether the fault is closed or not and the closing capacity. The method is proved to be feasible by the verification of actual data and compared with a fault seal method by a shale content (SGR) method of fractured rock and a fracture-reservoir displacement pressure difference evaluation fault seal method without considering bearing time.
In application number: in the Chinese patent application of CN201910488625.X, a fault sealing evaluation method for logging and extracting static quality coefficients is related, in particular to the field of oil and gas resource geological exploration and development evaluation. The evaluation method comprises the following steps: firstly, analyzing the spectrum attribute, the wavelet attribute and the integral attribute of the conventional logging data passing through the fracture zone, and optimizing the sensitive attribute parameters; step two, combining the selected fracture zone structure logging attribute parameters with parameters capable of representing the development degree of cracks to construct fracture zone structure dividing parameters; thirdly, representing fault plugging property related coefficients and fracture zone structure dividing parameters by using the well logging data of the research block to obtain a static quality coefficient S extracted by logging; and fourthly, obtaining the S coefficient extracted by the research block based on the logging attribute to judge the fault sealing standard. The method considers the influence of the internal structure of the fault on the fault sealing performance, solves the influence of the fault sealing performance to a certain extent, and has practical significance for logging evaluation of reservoirs and oil field development of complex fault block oil and gas fields.
The prior art is greatly different from the invention, the technical problem which is needed to be solved by the invention is not solved, and the invention provides a novel fault plugging oil gas capability evaluation method based on the section inclination angle.
Disclosure of Invention
The invention aims to provide a fault plugging seismic characterization method which is simple and convenient to apply and is used for evaluating fault dip angles and stratum dip angles on the basis of three-dimensional seismic data.
The aim of the invention can be achieved by the following technical measures: the method for evaluating the fault plugging oil and gas capacity based on the section inclination angle comprises the following steps of:
step 1, determining the height h of the oil-gas of the forward fault of the oil reservoir;
step 2, calculating true dip angles a of all forward faults;
step 3, calculating stratum inclination angle b of the fault descent disc;
step 4, determining a quantitative relation of the influence of the fault dip angle a and the stratum dip angle b on the oil-gas-containing height h;
step 5, constructing a forward fault plugging evaluation parameter R;
and 6, determining the range of the value range of R during forward fault blocking.
The aim of the invention can be achieved by the following technical measures:
in step 1, a hydrocarbon height h of a forward fault of the found reservoir is determined based on a comprehensive evaluation map of the found reservoir in the work area.
In step 1, three-dimensional seismic data and drilling data of a research area are comprehensively analyzed, a hydrocarbon-bearing height h of a forward fault of the found oil deposit is determined according to a comprehensive evaluation chart of the found oil deposit in a working area, a structural chart of a fault plane is obtained, wherein the hydrocarbon-bearing height h of the oil deposit is determined, an oil-bearing bottom boundary h1 and an oil-bearing top surface burial depth h2 are determined through the structural chart of the oil deposit top surface, and the hydrocarbon-bearing height h=h2-h 1.
In step 2, determining the trend of the forward faults in the work area based on the seismic data and the geological data, establishing a two-dimensional section perpendicular to the trend of all the forward faults in the work area, and calculating the true dip angle a of all the forward faults.
In step 3, the formation dip b of the fault dip is calculated based on the two-dimensional profile perpendicular to the forward fault strike.
In step 4, the true dip angle a of the forward fault with definite control and storage function in the work area and the correlation between the stratum dip angle b corresponding to the true dip angle a and the trapped oil-gas height h are statistically analyzed, and the quantitative relation of the influence of the fault dip angle a and the stratum dip angle b on the oil-gas height h is determined.
In step 5, based on the quantitative relation between the oil-gas-containing height and the stratum inclination angle b and the fault inclination angle a, constructing a forward fault plugging evaluation parameter R.
In step 5, the calculation formula of the forward fault blocking property evaluation parameter R is: r=cos (a) cos (b).
In step 6, the range of the value range of R in forward fault plugging is determined by utilizing the found oil reservoir and combining the quantized relation of the fault dip angle, the stratum dip angle and the height of the oil-gas in the step 4.
In step 6, the fault is laterally blocked when the forward fault blocking property evaluation parameter R is more than 0.4.
The evaluation method of the fault plugging oil gas capacity based on the section dip angle in the invention comprises the step of providing a forward fault plugging evaluation method based on the fault dip angle and the stratum dip angle based on the seismic data, so that the plugging characteristics of faults can be effectively evaluated in a three-dimensional seismic data coverage area, and a new method is provided for evaluating fault oil reservoirs. The method can effectively carry out fault plugging evaluation on the non-well region based on the section inclination angle and the stratum inclination angle, and has the characteristics of rapidness and high efficiency compared with other methods.
Drawings
FIG. 1 is a flow chart of an embodiment of a method for evaluating fault plugging hydrocarbon capacity based on section inclination;
FIG. 2 is a seismic section view perpendicular to the fault strike in an embodiment of the invention;
FIG. 3 is a schematic diagram illustrating the calculation of the break-away surface inclination angle and the formation inclination angle according to an embodiment of the present invention;
FIG. 4 is a top view of an oil layer according to an embodiment of the present invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular forms also are intended to include the plural forms unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, and/or combinations thereof.
The following are several embodiments of the invention
Example 1
In a specific embodiment 1 to which the present invention is applied, the method for evaluating the fault plugging oil and gas capability based on the section inclination angle of the present invention comprises the following steps:
step 1, determining the height h of the oil and gas of the forward fault of the found oil deposit based on a comprehensive evaluation chart of the found oil deposit in the work area;
step 2, determining the trend of forward faults in the work area based on the seismic data and the geological data, establishing a two-dimensional section perpendicular to the trend of all forward faults in the work area, and calculating true dip angles a of all forward faults;
step 3, calculating the stratum inclination angle b of the fault descent disc based on a two-dimensional section perpendicular to the forward fault trend;
and 4, statistically analyzing the true dip angle a of the forward fault with the well-defined storage control function in the work area, the correlation between the stratum dip angle b and the trapped oil-gas-containing height h, and determining the quantitative relation of the influence of the fault dip angle a and the stratum dip angle b on the oil-gas-containing height h.
And 5, constructing a forward fault plugging evaluation parameter R based on the quantitative relation between the oil-gas-containing height and the stratum inclination angle b and the fault inclination angle a.
And 6, determining the range of the value range of R during forward fault plugging by utilizing the found oil reservoir and combining the quantized relation of the fault dip angle, the stratum dip angle and the height of the oil-gas in the step 4.
Example 2
In a specific embodiment 2 to which the present invention is applied, as shown in fig. 1, fig. 1 is a flowchart of a method for evaluating a fault plugging oil and gas capability based on a section inclination angle according to the present invention. The fault plugging oil gas capability evaluation method based on the section inclination angle comprises the following steps:
in step 101, three-dimensional seismic data and drilling data of a research area are comprehensively analyzed, a hydrocarbon-bearing height h of a forward fault of the found oil deposit is determined according to a comprehensive evaluation chart of the found oil deposit in a working area, a structural chart of a fault plane is obtained, wherein the hydrocarbon-bearing height h of the oil deposit is determined, an oil-bearing bottom boundary h1 and an oil-bearing top surface burial depth h2 are determined through the structural chart of the oil deposit top surface, and the hydrocarbon-bearing height h=h2-h 1. The flow proceeds to step 102.
In step 102, the trend of the forward faults in the work area is determined based on the seismic data and the geological data, a two-dimensional section perpendicular to the trend of all the forward faults in the work area is established, the true dip angle a of all the forward faults is calculated, and the flow proceeds to step 103.
In step 103, the formation dip b of the fault dip is calculated based on the two-dimensional section perpendicular to the forward fault direction, and the flow proceeds to step 104.
In step 104, the correlation between the true dip angle a of the forward fault with the well-defined reservoir effect and the corresponding stratum dip angle b and the trapped oil-gas height h in the work area is statistically analyzed, the quantitative relationship of the influence of the fault dip angle a and the stratum dip angle b on the oil-gas height h is determined, and the flow proceeds to step 105.
In step 105, based on the quantitative relationship between the oil and gas containing height and the formation dip b, the fault dip a, a forward fault plugging evaluation parameter R is constructed, where r=cos (a) cos (b), and the flow proceeds to step 106.
In step 106, the range of value of R at forward fault plugging is determined using the found reservoir in combination with the quantitative relationship of the fault inclination, formation inclination and hydrocarbon height analyzed in step 4, wherein R >0.4 is the fault lateral plugging.
Example 3
In an embodiment 3 to which the present invention is applied, fig. 2 is a seismic cross-section view perpendicular to the fault strike in an embodiment of the present invention, which uses three-dimensional seismic data to perform fine structural interpretation for a target fault, and calculates a section inclination angle and a stratum inclination angle;
FIG. 3 is a schematic illustration of the calculation of the break-away surface dip and formation dip in an embodiment of the invention, where α is the profile dip and β is the formation dip, based on a fine interpretation of the seismic profile, and performing a deep conversion to a geologic profile, and performing the calculation of the profile dip and formation dip.
FIG. 4 is a top view of an oil layer according to an embodiment of the present invention. The oil and gas height h is calculated by reading the trap top surface burial depth h1 on the formation map of the top surface of the reservoir and the oil-water interface h2 revealed by drilling, wherein h=h2-h 1.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but although the present invention has been described in detail with reference to the foregoing embodiment, it will be apparent to those skilled in the art that modifications may be made to the technical solution described in the foregoing embodiment, or equivalents may be substituted for some of the technical features thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Other than the technical features described in the specification, all are known to those skilled in the art.
Claims (10)
1. The method for evaluating the fault plugging oil and gas capacity based on the section inclination angle is characterized by comprising the following steps of:
step 1, determining the height h of the oil-gas of the forward fault of the oil reservoir;
step 2, calculating true dip angles a of all forward faults;
step 3, calculating stratum inclination angle b of the fault descent disc;
step 4, determining a quantitative relation of the influence of the fault dip angle a and the stratum dip angle b on the oil-gas-containing height h;
step 5, constructing a forward fault plugging evaluation parameter R;
and 6, determining the range of the value range of R during forward fault blocking.
2. The method for evaluating the fault plugging capability based on the inclination angle of a fracture according to claim 1, wherein in step 1, the height h of the hydrocarbon containing gas of the forward fault of the found oil reservoir is determined based on the comprehensive evaluation chart of the found oil reservoir in the work area.
3. The method for evaluating the fault plugging oil and gas capacity based on the inclination angle of the fracture according to claim 2, wherein in the step 1, three-dimensional seismic data and drilling data of a research area are comprehensively analyzed, the oil and gas containing height h of a forward fault of an oil deposit is determined according to a comprehensive evaluation chart of the oil deposit found in a work area, a structural chart of a fault plane is obtained, the oil and gas containing height h of the oil deposit is determined, an oil and gas containing bottom boundary h1 and an oil and gas containing top surface burial depth h2 are determined through the structural chart of the oil deposit top surface, and the oil and gas containing height h=h2-h 1.
4. The method for evaluating the fault plugging oil and gas capacity based on the inclination angle of the section according to claim 1, wherein in the step 2, the trend of the forward faults in the work area is determined based on seismic data and geological data, a two-dimensional section perpendicular to the trend of all the forward faults in the work area is established, and the true inclination angle a of all the forward faults is calculated.
5. The method for evaluating a fault plugging hydrocarbon capacity based on a section inclination angle according to claim 1, wherein in step 3, the formation inclination angle b of the fault dip is calculated based on a two-dimensional section perpendicular to the forward fault strike.
6. The method for evaluating the fault plugging oil and gas capacity based on the section inclination angle according to claim 1, wherein in step 4, the correlation between the true inclination angle a of the forward fault with the well-defined reservoir control function and the corresponding stratum inclination angle b and the trapped oil and gas height h in the work area is statistically analyzed, and the quantitative relation of the influence of the fault inclination angle a and the stratum inclination angle b on the oil and gas height h is determined.
7. The method for evaluating the fault plugging oil and gas capacity based on the section inclination angle according to claim 1, wherein in the step 5, a forward fault plugging evaluation parameter R is constructed based on the quantitative relation between the oil and gas containing height and the stratum inclination angle b, the fault inclination angle a.
8. The method for evaluating the plugging ability of a fault with a dip angle according to claim 7, wherein in step 5, the calculation formula of the plugging ability evaluation parameter R is: r=cos (a) cos (b).
9. The method for evaluating the fault plugging oil and gas capacity based on the section inclination angle according to claim 1, wherein in the step 6, the range of value of R in forward fault plugging is determined by utilizing the found oil reservoir and combining the quantized relation between the formation inclination angle and the oil and gas containing height of the fault inclination angle analyzed in the step 4.
10. The method for evaluating the oil and gas plugging capability of a fault based on the inclination angle of a fracture according to claim 9, wherein in the step 6, the fault is laterally plugged when the forward fault plugging property evaluation parameter R is greater than 0.4.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210566699.2A CN117148438A (en) | 2022-05-23 | 2022-05-23 | Fracture-inclination-angle-based fault plugging oil-gas capability evaluation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210566699.2A CN117148438A (en) | 2022-05-23 | 2022-05-23 | Fracture-inclination-angle-based fault plugging oil-gas capability evaluation method |
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