Method, apparatus and electronic device for finely depicting the superposed pinch-out reservoir of thin interbeds
By combining forward simulation and inversion simulation, correcting the tip-kill line position and characterizing the reservoir thickness changes, the problem of fine description of thin interlayer super-covered tip-kill reservoirs is solved, and the prediction accuracy and recognition effect are improved.
Patent Information
- Application Number
- CN202011148491.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-10-23
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2040-10-23
AI Technical Summary
The prior art is difficult to accurately describe thin interlayer super-covered sharp-sharp reservoirs in lithologic oil and gas reservoir exploration, especially in actual data with fast lateral changes. There is an error between the sharp-sharp lines and the actual formation in earthquake description, making it difficult to accurately describe longitudinal thickness changes.
Combining forward simulation and inversion simulation, by establishing the relationship between the sharp-scatter angle and the seismic data identification error, correcting the sharp-scatter line position, and using well data intersection analysis and waveform indication simulation inversion, the thickness changes of the thin interlayer reservoir are carefully depicted, and finally the fine description of the thin interlayer super-covered sharp-scatter reservoir is realized in space.
The prediction accuracy of thin inter-type super-covered tip destruction reservoirs is improved, the exploration risks are reduced, and high-precision identification and description of thin inter-layer reservoirs are achieved.
Smart Images
Figure CN114488290B_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of reservoir prediction of seismic data, and particularly relates to a method, a device and an electronic device for identifying the space of a thin interbed overlapping and pinching-out reservoir. Background Art
[0002] In the exploration of lithologic oil and gas reservoirs, an important reservoir is the thin interbed reservoir. A thin interbed refers to a sedimentary rock mass in which reservoirs (sandstones) and non-reservoirs (mud) alternately appear vertically and have relatively small thicknesses, showing frequent sand-mud alternation vertically. The thickness of a single sand layer in such a reservoir is relatively thin, the lateral connectivity is poor, and the lateral pinch-out is fast, which brings great difficulties to the prediction of lithologic oil and gas reservoirs.
[0003] Overlap refers to the phenomenon that during a marine transgression, as the sedimentation range expands, the sedimentation range of the overlying rock layer is larger than that of the underlying rock layer. Pinch-out refers to the phenomenon that an object with a certain volume gradually shrinks until it disappears. The pinch-out of a stratum refers to the fact that the sedimentary layer gradually thins towards the edge of the sedimentary basin until there is no sedimentation.
[0004] The accurate description of thin interbed overlapping and pinching-out reservoirs has always been a difficult problem in the field of reservoir prediction. On the one hand, due to the fact that the reservoir thickness gradually thins near the pinch-out point, affected by the tuning effect, there are often large errors between the pinch-out line traced according to seismic reflection characteristics in seismic description and the actual pinch-out line of the stratum oil reservoir, and it is difficult to accurately implement the overburden line of the stratum oil reservoir.
[0005] Currently, the commonly used methods for predicting thin interbed overlapping and pinching-out reservoirs mainly focus on accurately depicting the pinch-out line on the plane: one is based on the tuning thickness theory; the other is to use methods such as instantaneous phase attributes and waveform clustering classification to identify the pinch-out line. Although it plays a certain role, in actual data with relatively fast lateral changes, the ideal accuracy and accuracy cannot be achieved. And the longitudinal thickness change of the reservoir is also very important for its accurate description, and a method combining plane and longitudinal results needs to be further developed. Summary of the Invention
[0006] Aiming at the problems that occur in current seismic exploration production, the present invention explores and establishes a set of fine identification processes for thin interbed overlapping and pinching-out reservoirs based on the combination of forward modeling and inversion methods.
[0007] Based on forward modeling, the present invention establishes pinch-out geological models at different angles, analyzes the relationship between different pinch-out angles and seismic data recognition errors, and then corrects and back-calculates the true position of the pinch-out line through this relationship. The present invention also makes full use of the advantages of waveform-indicated simulation inversion method, analyzes specific geological information represented by different well data parameters, and finally realizes the prediction of the distribution and thickness of thin interbedded reservoirs. Finally, by fully combining the forward and inversion results and structural interpretation results, the thin interbedded overlapping pinch-out reservoirs are jointly and finely characterized in the vertical and planar reservoir extents. This method has achieved good results in the application of actual data, improved the prediction accuracy of thin interbedded overlapping pinch-out reservoirs, and verified the practicability of the method.
[0008] According to one aspect of the present invention, there is provided a method for jointly and finely characterizing thin interbedded overlapping pinch-out reservoirs by combining forward and inversion, including:
[0009] Characterize the pinch-out line on the plane based on forward modeling;
[0010] Characterize the thickness variation of the thin interbedded reservoir in the vertical direction based on inversion simulation;
[0011] Describe the thin interbedded overlapping pinch-out reservoir in space based on the described pinch-out line and thickness variation.
[0012] Further, by performing forward modeling on pinch-outs at different angles, establish the relationship between different pinch-out angles and the recognition error of pinch-out points in seismic data, and accurately characterize the pinch-out line on the plane.
[0013] Further, the characterizing the pinch-out line on the plane based on forward modeling includes:
[0014] Establish forward models of overlapping pinch-outs at different angles, select seismic wavelets for forward modeling, and obtain forward records;
[0015] Compare the error between the pinch-out points read from the forward records and the true pinch-out points on the model, and perform trend fitting on the pinch-out angle and the recognition error;
[0016] According to the relationship between the pinch-out angle and the recognition error of pinch-out points fitted from different actual data, correct the pinch-out line to the accurate position.
[0017] Further, taking the correlation coefficient R 2 Closest to 1 as the selection criterion, the variation amplitude of the pinch-out angle and the recognition error is fitted using a power trend line, and the formula is as follows:
[0018] y = ax b
[0019] Wherein, x is the pinch-out angle, and y is the recognition error of the pinch-out point.
[0020] Furthermore, analyze and study the actual logging data, establish the relationship between sensitive logging parameters and thin interbed reservoirs and capping beds, and achieve fine characterization of the reservoirs and capping beds vertically through well curve simulation inversion.
[0021] Furthermore, the vertical characterization of the thickness change of the thin interbed reservoir based on inversion simulation includes:
[0022] For the existing logging data penetrating the thin interbed, conduct cross-plot analysis of well data;
[0023] Select sensitive parameters with a high degree of discrimination between thin interbed reservoirs and capping beds;
[0024] Conduct waveform indication simulation inversion analysis for the selected sensitive parameters;
[0025] Determine the value range of reservoir sensitive parameters to obtain the vertical thickness change of the reservoir;
[0026] Fine-characterize the thin interbed overlapping and pinch-out reservoir vertically.
[0027] According to another aspect of the present invention, there is provided an apparatus for fine-characterizing a thin interbed overlapping and pinch-out reservoir by combining forward and inverse modeling, including:
[0028] A lateral characterization unit for characterizing the pinch-out line on a plane based on forward modeling;
[0029] A vertical characterization unit for characterizing the thickness change of the thin interbed reservoir vertically based on inverse modeling;
[0030] A fine-characterization unit for describing the thin interbed overlapping and pinch-out reservoir in space based on the pinch-out line and thickness change.
[0031] Furthermore, the lateral characterization unit further includes:
[0032] Establish forward models of overlapping and pinch-out at different angles, select seismic wavelets for forward modeling to obtain forward records;
[0033] Compare the error between the pinch-out points read from the forward records and the true pinch-out points on the model, and conduct trend fitting for the pinch-out angle and recognition error;
[0034] According to the relationship between the pinch-out angle and the recognition error of the pinch-out point fitted from different actual data, correct the pinch-out line to the accurate position.
[0035] Furthermore, the vertical characterization unit further includes:
[0036] For the existing logging data penetrating the thin interbed, conduct cross-plot analysis of well data;
[0037] Select sensitive parameters with a high degree of discrimination between thin interbed reservoirs and capping beds;
[0038] Conduct waveform indication simulation inversion analysis for the selected sensitive parameters;
[0039] Determine the value range of reservoir sensitive parameters and obtain the vertical thickness change of the reservoir;
[0040] Vertically depict the thin interbed overlapping and pinch-out reservoir in detail.
[0041] According to another aspect of the present invention, there is provided an electronic device, which includes:
[0042] A memory storing executable instructions;
[0043] A processor that runs the executable instructions in the memory to implement the method for finely depicting the thin interbed overlapping and pinch-out reservoir by combining forward and inverse inversions.
[0044] The present invention has the following advantages compared with the existing technologies:
[0045] For actual data, a power trend line with the highest correlation coefficient is selected to establish the relationship between the pinch-out point recognition error and the pinch-out angle, laying a foundation for subsequent research.
[0046] Different from the traditional process that only focuses on depicting the planar range of the reservoir, this method is a technical method that combines forward and inverse inversions and predicts both horizontally and vertically, realizing the fine description of the thin interbed overlapping and pinch-out reservoir in space.
[0047] In the application in a certain exploration area in the east, the solution of the present invention has achieved good application effects, providing valuable research results for the fine exploration and development of this oilfield. BRIEF DESCRIPTION OF THE DRAWINGS
[0048] By describing the exemplary embodiments of the present disclosure in more detail in conjunction with the drawings, the above and other objects, features, and advantages of the present disclosure will become more apparent. Among them, in the exemplary embodiments of the present disclosure, the same reference numerals generally represent the same components.
[0049] Figure 1 It is a flowchart of the method for finely depicting the thin interbed overlapping and pinch-out reservoir by combining forward and inverse inversions of the present invention.
[0050] Figure 2 It is a flowchart of the method for finely depicting the thin interbed overlapping and pinch-out reservoir according to an embodiment of the present invention.
[0051] Figure 3 It is a forward model according to an embodiment of the present invention.
[0052] Figure 4 It is the forward result and error statistics according to an embodiment of the present invention.
[0053] Figure 5 It is a fitting trend graph of the pinch-out angle and the pinch-out point error according to the embodiments of the present invention.
[0054] Figure 6 It is the plane pinch-out line error correction and fine characterization according to the embodiments of the present invention.
[0055] Figure 7 It is the crossplot analysis of logging parameters according to the embodiments of the present invention.
[0056] Figure 8 It is to inversely identify thin interbedded reservoirs longitudinally according to the embodiments of the present invention.
[0057] Figure 9 It is to comprehensively characterize the spatial distribution of reservoirs according to the embodiments of the present invention. Specific embodiments
[0058] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure will be more thorough and complete, and can fully convey the scope of the present disclosure to those skilled in the art.
[0059] The present invention has established a comprehensive identification method and process for thin interbedded onlap pinch-out reservoirs, which predicts the planar boundary of reservoirs by forward statistical fitting error trend on the plane and predicts the thickness by well parameter inversion longitudinally. First, through forward simulation analysis, the important influence of different formation pinch-out angles on the accurate identification of the pinch-out point position is analyzed. Using the power trend line fitting, the relationship between the pinch-out angle and the identification error of the pinch-out point is established, and the accurate position of the pinch-out line is corrected on the plane. Then, crossplot analysis is performed on well data, sensitive logging parameters are selected, and high-resolution waveform indication simulation inversion is performed using the sensitive parameters to accurately distinguish reservoirs and caps longitudinally. Finally, by integrating the accurate characterization results in the horizontal and vertical directions, the identification results of thin interbedded onlap pinch-out reservoirs in space are formed, and the coincidence degree with the known logging data is higher than that of the traditional method, which verifies the practicability of the method.
[0060] The detailed flowchart is as shown in the attached Figure 1 As shown, the present invention provides a method for combining forward and inverse modeling to finely characterize thin interbedded onlap pinch-out reservoirs, including:
[0061] Characterize the pinch-out line on the plane based on forward simulation;
[0062] Characterize the thickness change of thin interbedded reservoirs longitudinally based on inverse simulation;
[0063] Describe the thin interbedded onlap pinch-out reservoirs in space based on the pinch-out line and the thickness change.
[0064] Specifically, through forward modeling, analyze the differences in identifying the positions of pinch-out points in seismic imaging data for different pinch-out angles; establish the relationship between the pinch-out angle and the identification error of the pinch-out point, and accurately depict the pinch-out line on the plane. Then, use multiple sets of logging data in the actual work area that penetrate thin interbedded reservoirs, conduct crossplot analysis, select sensitive parameters, establish the relationship between thin reservoirs and their capping layers in the actual data and the logging data. Finally, perform inversion through this relationship, longitudinally identify the thickness of the thin reservoir from the inversion results, and combine with the lateral characterization results to obtain a comprehensive and accurate understanding of the spatial distribution of the thin interbedded onlap pinch-out reservoir, and good results have been achieved in the application of actual data.
[0065] Preferably, by establishing onlap pinch-out forward models at different angles, select seismic wavelets for forward modeling according to the actual data situation to obtain forward records. Compare the errors between the pinch-out points read from the forward records and the true pinch-out points on the models. Fit the trends of the pinch-out angle and the identification error. Through research and comparison, with the correlation coefficient R 2 closest to 1 as the selection criterion, the variation range of the pinch-out angle and the identification error is suitable for fitting with a power trend line, and the formula is as follows:
[0066] y = ax b
[0067] where x is the pinch-out angle and y is the identification error of the pinch-out point.
[0068] The influence of different pinch-out angles on the accurate identification of the pinch-out point is clarified through curve fitting. According to the relationship between the pinch-out angle and the identification error of the pinch-out point fitted from different actual data, the pinch-out line can be corrected to the accurate position.
[0069] For the existing logging data that penetrate thin interbedded reservoirs, conduct well data crossplot analysis. Through statistical analysis of multiple typical wells, establish the relationship between thin interbedded onlap pinch-out reservoirs and their capping layers, laying a foundation for differentiating reservoirs and capping layers in subsequent inversion. On the basis of the above research, for the selected sensitive logging curves, conduct waveform-indicated simulated inversion. Based on the results of the previous sensitive parameter and lithology crossplot analysis, determine the range of logging parameter values for the reservoir, obtain the corresponding reservoir thickness in the inversion results, and then longitudinally depict the thickness variation of the thin interbedded reservoir.
[0070] Finally, combine and analyze the prediction results in the longitudinal and lateral aspects to describe the thin interbedded onlap pinch-out reservoir in space.
[0071] The innovation of the present invention lies in the first establishment of a technical process for the fine description of thin interbedded and onlapped pinch-out reservoirs by combining forward and inverse modeling, and the use of this method to carry out research on the fine target description of thin interbedded and onlapped pinch-out reservoirs in actual data. By forward modeling, the different effects of different pinch-out angles on the identification of pinch-out points in seismic data are analyzed, so as to accurately depict the true position of the pinch-out line on the plane; at the same time, the actual logging data is analyzed and studied, the relationship between sensitive logging parameters and thin interbedded reservoirs and caprocks is established, and the fine vertical characterization of reservoirs and caprocks is realized through well curve simulation inversion using this relationship. Combining the prediction results in the vertical and horizontal aspects improves the prediction accuracy of such reservoirs and reduces the exploration risk.
[0072] To facilitate the understanding of the solutions and effects of the embodiments of the present invention, the following gives specific application examples. Those skilled in the art should understand that this example is only for facilitating the understanding of the present invention, and any specific details are not intended to limit the present invention in any way.
[0073] Example 1
[0074] The following will refer to Figure 2 , and describe in detail the specific embodiments of the present invention. As shown in the figure, the steps of this embodiment are as follows:
[0075] First, a forward model is established according to the actual lithology data in the work area, forward modeling is carried out for pinch-outs at different angles, a trend line between different pinch-out angles and the identification error of pinch-out points in seismic data is established, and the true pinch-out line on the plane is determined. Specifically, the error between the pinch-out point read from the forward record and the true pinch-out point on the model is compared, and trend fitting is performed on the pinch-out angle and the identification error; according to the relationship between the pinch-out angle and the pinch-out point identification error fitted by different actual data, the pinch-out line is corrected to the accurate position.
[0076] At the same time, for the actual well data volume, cross-plot analysis is carried out, and sensitive parameters with a high degree of discrimination between thin interbedded reservoirs and caprocks are selected; high-precision waveform indication simulation inversion analysis is performed on the selected sensitive parameters to determine the value range of reservoir sensitive parameters and obtain the longitudinal thickness change of the reservoirs in the work area.
[0077] Specifically, for the existing logging data penetrating the thin interbeds, well data cross-plot analysis is carried out; sensitive parameters with a high degree of discrimination between thin interbedded reservoirs and caprocks are selected; waveform indication simulation inversion analysis is performed on the selected sensitive parameters; the value range of reservoir sensitive parameters is determined, and the longitudinal thickness change of the reservoirs is obtained; the thin interbedded and onlapped pinch-out reservoirs are finely characterized vertically.
[0078] Finally, based on the above-mentioned pinch-out line and thickness change, the thin interbedded and onlapped pinch-out reservoirs are described in space.
[0079] Example 2
[0080] This embodiment combines with Figures 3 - 9 to describe a specific application embodiment of the method of the present invention.
[0081] In a certain exploration area in the east, there is an onlap pinch-out reservoir with thin interbedded sandstone and mudstone that has development prospects. If the well position is deployed too high, the sand body has already pinched out; if it is too low, an aquifer will be drilled. Therefore, the fineness of its characterization will surely be the focus of research. This time, the shallowest first set of reservoirs in its reservoir section is taken as the research target.
[0082] Make a reservoir pinch-out model according to the actual lithology data of the work area. As shown in the appendix Figure 3 shown, through designing different pinch-out angles for wavefield forward modeling, a forward modeling section is finally obtained. See the appendix Figure 4 . On the forward modeling section, when the layer thickness becomes smaller and smaller as it approaches the pinch-out point, the top and bottom reflection signals of the reservoir will overlap each other. There is a certain error between the pinch-out point identified by traditional phase tracking and the actual pinch-out point of the model, and the size of the error changes with the change of the pinch-out angle.
[0083] It can be seen from the error statistics that the smaller the pinch-out angle, the greater the identification error of the pinch-out point. Use a power trend line for fitting to establish the relationship between the pinch-out angle and the identification error on seismic. As shown in the appendix Figure 5 shown. According to the geological overview of the experimental work area, at intervals of 1000 m on the pinch-out line identified by the original seismic, the pinch-out angles are respectively read. According to the fitting trend line, the error distance is deduced, so as to determine the position of the true and accurate pinch-out line and determine the distribution range of the reservoir in the plane. See the appendix Figure 6 . It lays a theoretical foundation for subsequent related research.
[0084] Use the logging data of ten typical wells in the test area to conduct cross-plot analysis on the lithology logging parameters for the reservoir sandstone and the caprock mudstone. See the appendix Figure 7 . In this work area, the logging parameter SP can better distinguish sandstone from mudstone. For this parameter, high-precision waveform indication simulation inversion is carried out based on the waveform of seismic data. As shown in the appendix Figure 8 shown. The inversion result can distinguish the reservoir and the caprock with a layer thickness of less than 20 m. Among them, the reservoir with a first layer thickness of 8 m is the reservoir corresponding to the appendix Figure 6 . The sandstone and mudstone are accurately identified vertically, which is consistent with the actual drilling situation, verifying the accuracy of the result. Further use the cross-plot analysis result of the sensitive parameters obtained from the appendix Figure 7 to determine the value range of the reservoir SP value: 0 - 60. Using the determined value range, with the pinch-out line obtained from the appendix Figure 5 as the condition, the planar distribution of the sand body reservoir thickness of the target layer section is obtained on the result of high-precision inversion (see the appendix Figure 9) The characterization results have a high degree of consistency with the logging data of the four existing wells (Well A, Well B, Well C, and Well D), and the target reservoir section is finely characterized in space.
[0085] In the later stage, the vertical and horizontal identification results of the forward and inverse methods can be combined with the conventional structural interpretation results and other seismic attributes to further study the reservoir characteristics and reduce the exploration risk.
[0086] Example 3
[0087] This embodiment provides a device for finely characterizing thin interbed overlapping pinch-out reservoirs by combining forward and inverse methods, including:
[0088] A horizontal characterization unit that characterizes the pinch-out line on a plane based on forward modeling;
[0089] A vertical characterization unit that characterizes the thickness variation of the thin interbed reservoir longitudinally based on inverse modeling;
[0090] A fine characterization unit that describes the thin interbed overlapping pinch-out reservoir in space based on the pinch-out line and the thickness variation.
[0091] The horizontal characterization unit and the vertical characterization unit are respectively communicatively connected to the fine characterization unit, and respectively send the horizontal characterization result and the vertical characterization result to the fine characterization unit. The fine characterization unit describes the thin interbed overlapping pinch-out reservoir in space based on the pinch-out line and the thickness variation.
[0092] Further, the horizontal characterization unit further includes:
[0093] Establish forward models of overlapping pinch-out at different angles, select seismic wavelets for forward modeling, and obtain forward records;
[0094] Compare the error between the pinch-out points read on the forward record and the true pinch-out points on the model, and perform trend fitting on the pinch-out angle and the recognition error;
[0095] According to the relationship between the pinch-out angle fitted with different actual data and the recognition error of the pinch-out points, correct the pinch-out line to the accurate position.
[0096] Further, the vertical characterization unit further includes:
[0097] Perform crossplot analysis of well data for the existing logging data that penetrates the thin interbed;
[0098] Select sensitive parameters with a high degree of discrimination between the thin interbed reservoir and the caprock;
[0099] Perform waveform indication simulation inversion analysis on the selected sensitive parameters;
[0100] Determine the value range of the reservoir sensitive parameters to obtain the longitudinal thickness variation of the reservoir.
[0101] Vertically finely depict the thin interbed overlapping and pinch-out reservoir.
[0102] Example 4
[0103] This embodiment provides an electronic device, which includes: a memory storing executable instructions; a processor that runs the executable instructions in the memory to implement the method of combining forward and inverse modeling to finely depict the thin interbed overlapping and pinch-out reservoir as described above.
[0104] The electronic device according to an embodiment of the present disclosure includes a memory and a processor.
[0105] The memory is used to store non-temporary computer-readable instructions. Specifically, the memory may include one or more computer program products, and the computer program products may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc.
[0106] The processor may be a central processing unit (CPU) or other forms of processing units with data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions. In an embodiment of the present disclosure, the processor is used to run the computer-readable instructions stored in the memory.
[0107] Those skilled in the art should understand that, in order to solve the technical problem of how to obtain good user experience effects, this embodiment may also include well-known structures such as communication buses, interfaces, etc., and these well-known structures should also be included in the protection scope of the present disclosure.
[0108] For the detailed description of this embodiment, reference may be made to the corresponding descriptions in the foregoing embodiments, and details will not be repeated here.
[0109] Example 5
[0110] The embodiment of the present disclosure provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, it implements the method of combining forward and inverse modeling to finely depict the thin interbed overlapping and pinch-out reservoir.
[0111] The computer-readable storage medium according to an embodiment of the present disclosure stores non-temporary computer-readable instructions thereon. When the non-temporary computer-readable instructions are run by a processor, all or part of the steps of the methods in the foregoing embodiments of the present disclosure are executed.
[0112] The above computer-readable storage media include, but are not limited to: optical storage media (e.g., CD-ROM and DVD), magneto-optical storage media (e.g., MO), magnetic storage media (e.g., magnetic tape or removable hard disk), media with built-in rewritable non-volatile memory (e.g., memory card), and media with built-in ROM (e.g., ROM cartridge).
[0113] Those skilled in the art should understand that the purpose of the above description of the embodiments of the present invention is only to exemplarily illustrate the beneficial effects of the embodiments of the present invention, and is not intended to limit the embodiments of the present invention to any of the examples given.
[0114] The embodiments of the present invention have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims
1. A method for finely characterizing the superposed pinch-out reservoir of thin interbeds by combining forward and inverse modeling, characterized in that, Including: Characterize the pinch-out line on a plane based on forward modeling; Characterize the thickness variation of thin interbedded reservoirs vertically based on inversion modeling; Describe the thin interbedded overlapping pinch-out reservoir in space based on the pinch-out line and thickness variation described above; Among them, the characterizing the pinch-out line on a plane based on forward modeling includes: Establish forward models of overlapping pinch-outs at different angles, select seismic wavelets for forward modeling, and obtain forward records; Compare the error between the pinch-out points read from the forward records and the true pinch-out points on the model, and perform trend fitting on the pinch-out angle and recognition error; According to the relationship between the pinch-out angle and the recognition error of the pinch-out point fitted from different actual data, correct the pinch-out line to the accurate position; Among them, taking the correlation coefficient R 2 closest to 1 as the selection criterion, the variation range of the pinch-out angle and the recognition error is fitted by a power trend line, and the formula is as follows: y = ax b Among them, x is the pinch-out angle and y is the recognition error of the pinch-out point.
2. The method for finely depicting the thin interbed overlapping and pinch-out reservoir by combining forward and inverse modeling according to claim 1, characterized in that By performing forward modeling on pinch-outs at different angles, establish the relationship between different pinch-out angles and the recognition error of the pinch-out points in seismic data, and accurately characterize the pinch-out line on a plane.
3. The method for finely depicting the thin interbed overlapping and pinch-out reservoir by combining forward and inverse modeling according to claim 1, characterized in that Analyze and study the actual logging data, establish the relationship between sensitive logging parameters and thin interbedded reservoirs and caprocks, and achieve fine vertical characterization of reservoirs and caprocks through well curve simulation inversion.
4. The method for finely depicting the thin interbed overlapping and pinch-out reservoir by combining forward and inverse modeling according to claim 1, characterized in that, The characterizing the thickness variation of thin interbedded reservoirs vertically based on inversion modeling includes: For the existing logging data penetrating the thin interbedded reservoirs, conduct cross-plot analysis of well data; Select sensitive parameters with a high degree of discrimination between thin interbedded reservoirs and caprocks; Perform waveform-indicated simulation inversion analysis on the selected sensitive parameters; Determine the value range of reservoir sensitive parameters to obtain the vertical thickness variation of the reservoir; Fine-characterize the thin interbedded overlapping pinch-out reservoir vertically.
5. An apparatus for finely characterizing the thin interbedded overlapping pinch-out reservoir by combining forward and inverse modeling, characterized in that, Including: Horizontal characterization unit, which characterizes the pinch-out line on a plane based on forward modeling; Vertical characterization unit, which characterizes the thickness variation of thin interbedded reservoirs vertically based on inversion modeling; Fine-characterization unit, which describes the thin interbedded overlapping pinch-out reservoir in space based on the pinch-out line and thickness variation described above; Among them, the horizontal characterization unit further includes: Establish forward models of overlapping pinch-outs at different angles, select seismic wavelets for forward modeling, and obtain forward records; Compare the error between the pinch-out points read from the forward records and the true pinch-out points on the model, and perform trend fitting on the pinch-out angle and recognition error; According to the relationship between the pinch-out angle and the recognition error of the pinch-out point fitted from different actual data, correct the pinch-out line to the accurate position; Among them, with the correlation coefficient R 2 Taking the one closest to 1 as the selection criterion, the variation range of the pinch-out angle and the recognition error is fitted with a power trend line, and the formula is as follows: y = ax b Among them, x is the pinch-out angle and y is the recognition error of the pinch-out point.
6. The device for finely depicting the thin interbed overlapping and pinch-out reservoir by combining forward and inverse modeling according to claim 5, characterized in that, The vertical characterization unit further includes: For the existing logging data penetrating the thin interbedded reservoirs, conduct cross-plot analysis of well data; Select sensitive parameters with a high degree of discrimination between thin interbedded reservoirs and caprocks; Perform waveform-indicated simulation inversion analysis on the selected sensitive parameters; Determine the value range of reservoir sensitive parameters to obtain the vertical thickness variation of the reservoir; Fine-characterize the thin interbedded overlapping pinch-out reservoir vertically.
7. An electronic device, characterized in that, The electronic device includes: A memory storing executable instructions; A processor that runs the executable instructions in the memory to implement the method for fine characterization of thin interbedded overlapping pinch-out reservoirs by combining forward and inversion modeling according to any one of claims 1-4.