Oil gas multi-stage reservoir forming process simulation method and related device

Abstract

The invention discloses an oil and gas multi-stage reservoir forming process simulation method and a related device. The method comprises the following steps: determining a minimum hydrocarbon expulsion threshold value required by each historical reservoir forming period; obtaining a stratum range related to oil-gas migration of reservoir forming in each period, and establishing a corresponding relation between the reservoir forming period and the stratum range; determining the reservoir forming period of each hydrocarbon expulsion process of the reservoir forming process to be simulated and the corresponding stratum range; and based on the reservoir forming period and the stratum range corresponding to each hydrocarbon expulsion process of the reservoir forming process to be simulated, simulating the oil and gas multi-period reservoir forming process. According to the method, multi-stage and quantitative simulation of the reservoir forming process can be realized in the same geologic model and attribute model, the modeling working intensity is reduced, the efficiency is improved, and the characteristic details of the oil-gas migration path diagram and the oil-gas saturation diagram in different reservoir forming stages are better displayed.

Description

Technical Field

[0001] The present invention relates to the field of geological exploration technology, and in particular to a method for simulating a multi-stage oil and gas reservoir formation process and a related device. Background Art

[0002] Ancient basins, especially complex superimposed basins, have multi-stage oil and gas generation due to their long sedimentary period and complex structural evolution, leading to multi-stage oil and gas accumulation. The multi-stage oil and gas accumulation process is an important part of the study of oil and gas systems, basin simulation and comprehensive oil and gas geology. Therefore, establishing an accurate and detailed simulation method for the multi-stage accumulation process is of great significance for studying the distribution of oil and gas reservoirs and optimizing the deployment of oil and gas exploration wells in complex areas.

[0003] At present, the multi-stage accumulation process of oil and gas reservoirs is mainly based on qualitative analysis and research, and the technical requirements for multi-stage and quantitative simulation of the accumulation process have not yet been met. If multiple geological models and attribute models are established to simulate the multi-stage accumulation process, there will be problems such as large modeling workload, long calculation time, and difficulty in replaying the simulation process. Summary of the invention

[0004] In view of the above problems, an object of the present invention is to provide a method and related device for simulating the multi-stage oil and gas accumulation process.

[0005] In a first aspect, an embodiment of the present invention provides a method for simulating a multi-stage oil and gas accumulation process, comprising the following steps:

[0006] According to the historical accumulation stages of oil and gas reservoirs and the hydrocarbon expulsion process of the accumulation process, the minimum hydrocarbon expulsion threshold required for each historical accumulation stage is determined;

[0007] By tracking the oil and gas migration path and analyzing the distribution range of oil and gas reservoirs, the stratigraphic range involved in each stage of oil and gas migration is obtained, the reservoir formation stage is linked to the stratigraphic range involved in each stage of oil and gas migration, and the corresponding relationship between the reservoir formation stage and the stratigraphic range is established;

[0008] By comparing each hydrocarbon expulsion process of the reservoir formation process to be simulated with the minimum hydrocarbon expulsion threshold required for the reservoir formation period, the reservoir formation period in which each hydrocarbon expulsion process of the reservoir formation process to be simulated is determined; and according to the corresponding relationship between the reservoir formation period and the formation range, the formation range corresponding to each hydrocarbon expulsion process of the reservoir formation process to be simulated is determined;

[0009] Based on the accumulation period and formation range corresponding to each hydrocarbon expulsion process of the accumulation process to be simulated, the multi-stage oil and gas accumulation process is simulated.

[0010] In one embodiment, the hydrocarbon expulsion process is: the percentage of the preset hydrocarbon expulsion amount in the hydrocarbon expulsion process to the total hydrocarbon expulsion amount.

[0011] In one embodiment, according to the historical accumulation stages of the oil and gas reservoir and the hydrocarbon expulsion process of the accumulation process, the minimum hydrocarbon expulsion threshold required for each historical accumulation stage is determined, including:

[0012] Based on the study of historical oil and gas reservoir events, the total historical hydrocarbon expulsion of the oil and gas reservoir and the hydrocarbon expulsion required during the historical reservoir formation period are obtained;

[0013] The minimum hydrocarbon expulsion threshold is calculated according to the following formula:

[0014]

[0015] Where: P i is the minimum hydrocarbon expulsion threshold required for each historical accumulation period; E i is the amount of hydrocarbon expulsion required for the formation of each historical accumulation period; E is the total historical hydrocarbon expulsion of the oil and gas reservoir, i is the historical accumulation period, i = 1, 2, 3...N.

[0016] In one embodiment, by comparing each hydrocarbon expulsion process of the reservoir formation process to be simulated with the minimum hydrocarbon expulsion threshold required for the reservoir formation period, determining the reservoir formation period in which each hydrocarbon expulsion process of the reservoir formation process to be simulated is located, including:

[0017] When P exp ≧P N , i = N, the reservoir formation period to be simulated is the Nth period, and N is an integer;

[0018] When P exp <P N , and P i ≤P exp <P i+1 , the reservoir formation period to be simulated is the i-th period;

[0019] Where: P i is the minimum hydrocarbon expulsion threshold required for each historical accumulation period, P exp is the hydrocarbon expulsion process of the reservoir formation process to be simulated, i is the historical reservoir formation period, i=1, 2, 3...N.

[0020] In one embodiment, determining the formation range corresponding to each hydrocarbon expulsion process of the reservoir formation process to be simulated includes:

[0021] According to the accumulation period in which each hydrocarbon expulsion process of the accumulation process to be simulated occurs, from the correspondence between the accumulation period and the stratigraphic range, the stratigraphic range involved in the oil and gas migration corresponding to the accumulation period of the accumulation process to be simulated is found as the stratigraphic range for oil and gas migration during simulation.

[0022] In one embodiment, based on the accumulation stage and formation range corresponding to each hydrocarbon expulsion process of the accumulation process to be simulated, the multi-stage oil and gas accumulation process is simulated, including:

[0023] As each hydrocarbon expulsion process of the simulated accumulation process develops continuously from small to large, the oil and gas migration range is limited by successively modifying the calculation control parameters of the formation range to be simulated, and the parameter values ​​of the non-simulated formation range remain unchanged. The multi-stage accumulation process of the hydrocarbon expulsion process within the preset range under the same geological model is simulated to obtain the corresponding oil and gas migration path map and oil saturation map.

[0024] In one embodiment, the historical reservoir formation phases are obtained in advance by:

[0025] The historical oil and gas accumulation events are studied and the historical accumulation periods are determined based on the accumulation chronology method.

[0026] In a second aspect, an embodiment of the present invention provides a device for simulating a multi-stage oil and gas accumulation process, comprising:

[0027] The minimum hydrocarbon expulsion threshold determination module is used to determine the minimum hydrocarbon expulsion threshold required for each historical accumulation period according to the historical accumulation period of the oil and gas reservoir and the hydrocarbon expulsion process of the accumulation process;

[0028] A corresponding relationship determination module is used to obtain the stratigraphic range involved in each phase of oil and gas migration by tracking the oil and gas migration path and analyzing the distribution range of oil and gas reservoirs, and to associate the reservoir formation period with the stratigraphic range involved in each phase of oil and gas migration to establish a corresponding relationship between the reservoir formation period and the stratigraphic range;

[0029] The simulation module is used to simulate the multi-stage oil and gas accumulation process based on the accumulation stage and formation range corresponding to each hydrocarbon expulsion process of the accumulation process to be simulated.

[0030] In a third aspect, an embodiment of the present invention provides a computing device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the aforementioned method for simulating the multi-stage oil and gas accumulation process when executing the program.

[0031] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the aforementioned method for simulating a multi-stage oil and gas accumulation process.

[0032] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0033] The above-mentioned oil and gas multi-stage accumulation process simulation method and related devices provided by the embodiment of the present invention first determine the minimum hydrocarbon expulsion threshold corresponding to each historical accumulation period, and the formation range involved in the oil and gas migration of each accumulation period; then compare each hydrocarbon expulsion process of the accumulation process to be simulated with the minimum hydrocarbon expulsion threshold process required for each accumulation period, and determine the formation range corresponding to each hydrocarbon expulsion process of the accumulation process to be simulated; finally, based on the accumulation period and formation range corresponding to each hydrocarbon expulsion process of the accumulation process to be simulated, the multi-stage oil and gas accumulation process is simulated. The simulation method of the present invention has a clear process flow, few parameters, and clear meanings. The simulation of the preset range of multi-stage accumulation is completed once, which is convenient for engineering application and research. Compared with the method in the prior art that mainly uses qualitative analysis, it can realize multi-stage and quantitative accurate simulation of the accumulation process, and can better characterize the characteristic details of oil and gas migration and accumulation in different periods in the multi-stage accumulation process.

[0034] Furthermore, when simulating the oil and gas reservoir formation process, it is only carried out under the same geological model. As each hydrocarbon expulsion process of the simulated reservoir formation process develops, the calculation control parameters of the stratigraphic range are modified one by one to limit the oil and gas migration range, and the parameter values ​​of the non-simulated stratigraphic range remain unchanged. Finally, the simulation of the oil and gas reservoir formation process of the hydrocarbon expulsion process within the preset range is completed, without the need to establish multiple geological models and multiple attribute models for multi-stage reservoir formation simulation, which makes the operation simpler, reduces the intensity of modeling work, and improves the simulation efficiency.

[0035] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0037] Figure 1 It is a flow chart of a method for simulating a multi-stage oil and gas accumulation process in an embodiment of the present invention;

[0038] Figure 2a This is the oil and gas saturation map at the end of the first period;

[0039] Figure 2b This is the oil and gas saturation map at the end of the second period;

[0040] Figure 2c This is the oil and gas saturation map at the end of the third period;

[0041] Figure 3 This is the migration path (streamline) diagram at the end of period 3;

[0042] Figure 4 This is the hydrocarbon saturation + migration path (streamline) diagram at the end of period 3;

[0043] Figure 5 This is the oil and gas saturation map for non-multi-stage accumulation simulation;

[0044] Figure 6 It is the migration path (streamline) diagram of non-multi-stage reservoir simulation;

[0045] Figure 7 It is the oil and gas saturation + migration path (streamline) diagram of non-multi-stage accumulation simulation;

[0046] Figure 8 It is a schematic diagram of a device for simulating the multi-stage oil and gas accumulation process in an embodiment of the present invention. DETAILED DESCRIPTION

[0047] This embodiment provides a method for simulating a multi-stage oil and gas accumulation process. Although the accompanying drawings show exemplary embodiments of the present disclosure, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. Specifically, the following steps are included:

[0048] The embodiment of the present invention provides a method for simulating the multi-stage oil and gas accumulation process. Figure 1 As shown, the method comprises the following steps:

[0049] S11. Determine the minimum hydrocarbon expulsion threshold required for each historical reservoir formation period according to the historical reservoir formation period and the hydrocarbon expulsion process of the reservoir formation process;

[0050] S12. By tracking the oil and gas migration path and analyzing the distribution range of oil and gas reservoirs, the stratigraphic range involved in each period of oil and gas migration is obtained, and the historical accumulation period is linked to the stratigraphic range involved in each period of oil and gas migration, so as to establish a corresponding relationship between the historical accumulation period and the stratigraphic range;

[0051] S13, by comparing the minimum hydrocarbon expulsion threshold required for each hydrocarbon expulsion process of the to-be-simulated reservoir formation process with the historical reservoir formation period, determining the historical reservoir formation period in which each hydrocarbon expulsion process of the to-be-simulated reservoir formation process is located, and according to the corresponding relationship between the historical reservoir formation period and the formation range, determining the formation range corresponding to each hydrocarbon expulsion process of the to-be-simulated reservoir formation process;

[0052] S14. Based on the historical accumulation periods and stratigraphic ranges corresponding to each hydrocarbon expulsion process of the accumulation process to be simulated, the multi-stage oil and gas accumulation process is simulated.

[0053] In step S11, the historical accumulation period of the oil and gas reservoir can be obtained in advance by the following method:

[0054] By studying the hydrocarbon reservoir events, the historical hydrocarbon accumulation stages are determined according to the methods of hydrocarbon accumulation chronology.

[0055] For example, the hydrocarbon accumulation stages can be determined by analyzing the characteristics of fluid inclusions or by isotopic chronology analysis of authigenic illite, but the embodiments of the present invention are not limited to the above methods.

[0056] Record the determined hydrocarbon accumulation stages in sequence. For example, if there are N hydrocarbon accumulations, the hydrocarbon accumulation stages are 1, 2,..., N respectively.

[0057] In step S11, the hydrocarbon expulsion process refers to the percentage of the preset hydrocarbon expulsion volume in the total hydrocarbon expulsion volume during the hydrocarbon expulsion process.

[0058] For example, for the total hydrocarbon expulsion volume, according to the principle of hydrocarbon generation kinetics, calculate the total hydrocarbon generation amount G of the source rock layer, obtain the hydrocarbon expulsion coefficient k (0 < k < 1) through statistical analysis and analogical analysis, and calculate the total hydrocarbon expulsion volume E = G × k;

[0059] For the preset hydrocarbon expulsion volume, divide the hydrocarbon expulsion process into n steps, and the average hydrocarbon expulsion volume per step is E / n. Then, for the jth step, that is, the preset hydrocarbon expulsion volume E y = j × E / n.

[0060] Then, the hydrocarbon expulsion process

[0061] However, the embodiments of the present invention are not limited to the above methods.

[0062] Furthermore, in step S11, the minimum hydrocarbon expulsion threshold required for each historical hydrocarbon accumulation stage is the ratio of the hydrocarbon expulsion volume required for the formation of each historical hydrocarbon accumulation stage to the historical total hydrocarbon expulsion volume of the hydrocarbon reservoir, and can be calculated according to the following formula:

[0063]

[0064] Where: P i is the minimum hydrocarbon expulsion threshold required for each historical hydrocarbon accumulation stage; E i is the hydrocarbon expulsion volume required for the formation of each historical hydrocarbon accumulation stage; E is the historical total hydrocarbon expulsion volume of the hydrocarbon reservoir, and i is each historical hydrocarbon accumulation stage, i = 1, 2, 3... N.

[0065] A quantitative relationship table between historical hydrocarbon accumulation stages and hydrocarbon expulsion processes can also be established to clearly show the minimum hydrocarbon expulsion thresholds required for each hydrocarbon accumulation stage.

[0066] In step S12, by studying the hydrocarbon reservoir events, on the basis of the hydrocarbon accumulation stages obtained in step S11, the formation range of the strata involved in the hydrocarbon migration of each hydrocarbon accumulation is obtained.

[0067] For example, the stratum range involved in oil and gas migration can be obtained through oil source comparison and oil and gas migration tracer analysis, and nitrogen-containing compounds are selected as oil and gas migration tracer indicators, but the embodiments of the present invention are not limited to the above methods.

[0068] A corresponding relationship table can also be established to more clearly express the stratigraphic range involved in oil and gas migration corresponding to different historical accumulation periods.

[0069] In step S13, the accumulation period of each hydrocarbon expulsion process in the accumulation process to be simulated is determined, which can be obtained, for example, by the following method:

[0070] When P exp ≧P N , i = N, the reservoir formation period to be simulated is the Nth period, and N is an integer;

[0071] When P exp <P N , and P i ≤P exp <P i+1 , the reservoir formation period to be simulated is the i-th period;

[0072] Where: P i is the minimum hydrocarbon expulsion threshold required for each historical accumulation period, P exp is the hydrocarbon expulsion process of the reservoir formation process to be simulated, i is the historical reservoir formation period, i=1, 2, 3...N.

[0073] In addition, the stratigraphic range corresponding to each hydrocarbon expulsion process in the reservoir formation process to be simulated can be determined by the following method:

[0074] According to the accumulation period of each hydrocarbon expulsion process in the accumulation process to be simulated, from the corresponding relationship between the accumulation period and the stratigraphic range, the stratigraphic range involved in the oil and gas migration corresponding to the accumulation period of the accumulation process to be simulated is found as the stratigraphic range of oil and gas migration during simulation.

[0075] In step S14, through the aforementioned step S13, the historical accumulation period of the hydrocarbon expulsion process of the accumulation process to be simulated and the upper and lower formation ranges involved in the oil and gas migration are found. Within the formation range involved, the calculation control parameters are modified to limit the oil and gas migration path within this range, and for the formation range not involved, the calculation control parameters are not changed.

[0076] Then, without changing the stratigraphic framework model and stratigraphic attribute values, the simulation and three-dimensional image display of the multi-stage accumulation process can be completed by only limiting the upper and lower stratigraphic ranges of oil and gas migration in different accumulation periods.

[0077] For example, invasion and percolation simulation technology or Darcy flow simulation technology based on seepage mechanics is used to simulate the multi-stage accumulation process of hydrocarbon expulsion within a preset range to obtain an oil and gas migration path map and an oil saturation map, but the embodiments of the present invention are not limited to the above methods.

[0078] It should be noted that the embodiment of the present invention does not limit the number of hydrocarbon source layers.

[0079] The present invention proposes a method for simulating the multi-stage oil and gas accumulation process. First, the accumulation events are studied to determine the historical accumulation stages and the stratum range involved in each stage of accumulation; then, the accumulation stages of each hydrocarbon expulsion process in the simulated accumulation process are determined to calculate the total hydrocarbon expulsion amount and the corresponding stratum range; finally, the upper and lower stratum ranges of oil and gas migration are controlled, and the uninvolved strata are set as the oil and gas migration boundary; the migration and accumulation process from hydrocarbon source to trap during multi-stage oil and gas accumulation is simulated. The technical requirements of multi-stage and quantitative simulation can be more accurately achieved without changing the stratigraphic framework model and the stratigraphic attribute values.

[0080] The above-mentioned method for simulating the multi-stage oil and gas accumulation process is illustrated by a specific example.

[0081] A large-scale composite superimposed basin presents a structural pattern of three uplifts and four depressions. The Phanerozoic strata are well developed. The Paleozoic oil and gas reservoirs in the platform-basin area in the middle of the basin have experienced multiple tectonic movements and have obvious multi-stage accumulation characteristics. The study examines the multi-stage accumulation of oil and gas within this preset range from no hydrocarbon expulsion (hydrocarbon expulsion process J = 0) to complete hydrocarbon expulsion (J = 100%).

[0082] The first step is to study the accumulation events and determine the accumulation periods.

[0083] In this example, the study found that the stratigraphic framework includes 8 strata, including 1 source layer. According to the analysis of fluid inclusion characteristics and authigenic illite isotope chronology, the historical accumulation period is obtained to be 3 periods, as shown in Table 1 below.

[0084] Table 1

[0085] Serial number Stratigraphic code type Accumulation period Remark 1 P Covering layer / Upper sealing layer 2 C Reservoir, caprock 3 Aggregation Layer 3 D Reservoir, caprock 2 Aggregation Layer 4 S Reservoir, caprock 2 Aggregation Layer 5 O Reservoir, caprock 1 Aggregation Layer 6 HkDJ Reservoir 1 Aggregation Layer 7 HkD Source layer 0 Oil and gas migration starting point 8 Z Covering layer / Lower sealing layer

[0086] The second step is to analyze the history of hydrocarbon generation and expulsion, determine the quantitative relationship between the hydrocarbon expulsion process and the accumulation period, and clarify the minimum hydrocarbon expulsion threshold corresponding to the formation of each accumulation period.

[0087] By analyzing the relationship between the hydrocarbon generation and expulsion process and each historical accumulation period, the minimum hydrocarbon expulsion thresholds of the three accumulation periods are determined, as shown in Table 2 below.

[0088] Table 2

[0089]

[0090]

[0091] The third step is to analyze and define the stratigraphic scope involved in each period of reservoir formation, and establish a table of the stratigraphic scope involved in each period of reservoir formation.

[0092] Based on the oil source comparison and oil and gas migration tracer analysis, the stratigraphic range involved in the three phases of oil and gas migration was determined, as shown in Table 3 below, where the migration tracer indicators are nitrogen-containing compounds.

[0093] Table 3

[0094] Step 4: According to the preset hydrocarbon discharge process P exp , compare the minimum hydrocarbon expulsion threshold of each historical accumulation period, and determine P exp The period of accumulation in which the mineral is located.

[0095] Refer to Table 2, when the preset hydrocarbon discharge process P exp When it is less than 30%, the current accumulation period is 1; when P exp When it is less than 65% and greater than or equal to 30%, the current reservoir formation period is 2; when P exp When it is greater than or equal to 65%, the current reservoir formation period is 3.

[0096] Step 5: According to P exp According to the historical accumulation period, compare the stratigraphic range involved in each accumulation period and modify the upper and lower stratigraphic ranges of oil and gas migration.

[0097] Refer to Table 3, when the accumulation period is 1: oil and gas are forced to migrate only in the strata of O, HWx, and HWy;

[0098] When the accumulation period is 2: oil and gas are restricted to migrate only in the strata of O, HWx, HWy, D, and S;

[0099] When the accumulation period is 3: oil and gas are forced to migrate only in the strata of O, HWx, HWy, D, S, and C.

[0100] The sixth step is to use invasion and percolation simulation technology to track and simulate the entire process of migration and accumulation, draw oil and gas migration path maps and oil saturation maps, and complete multi-stage accumulation process simulation and three-dimensional graphic display.

[0101] For example, the oil and gas saturation distribution map and oil and gas migration path map at the end of each accumulation period can be obtained. Figure 2a-2c , Figure 3-4 In all the diagrams, the three-dimensional coordinate axes represent the spatial position relationship. Among them:

[0102] Figure 2a , Figure 2b and Figure 2cThe oil and gas saturation diagrams at the end of the 1st, 2nd and 3rd periods of the simulated reservoir formation process are shown. The color depths in different formations represent the oil and gas saturation of the corresponding formations.

[0103] Figure 3 is the migration path (streamline) diagram at the end of the third period, Figure 4 This is the oil and gas saturation + migration path (streamline) diagram at the end of the third period. The simulated migration path of the final accumulation is represented by the continuous thick lines in the figure.

[0104] Combination Figure 2a-2c , Figure 3-4 It can be clearly seen that when simulating the multi-period accumulation of oil and gas reservoirs, with the increase of the accumulation period, oil and gas gradually migrate from the source layer to the accumulation layer, the range of the oil and gas accumulation layer expands, and the oil and gas saturation value in the accumulation layer gradually increases. The changes in oil and gas saturation in different periods and the formed oil and gas migration paths are clear.

[0105] In order to compare the difference between multi-period accumulation and non-multi-period accumulation simulation, the accumulation period of the example is set to 1. Then, the same data sample and the same invasion and percolation simulation technology are used to track and simulate the entire process of oil and gas migration and accumulation. The oil and gas saturation distribution map and oil and gas migration path map under non-multi-period accumulation simulation are obtained, as shown in Fig. Figure 5-7 As shown. Among them:

[0106] Figure 5-7 It is a one-stage reservoir simulation for the same oil and gas reservoir, and the oil and gas saturation map, oil and gas migration path (streamline) map, and oil and gas saturation + migration path (streamline) map are obtained respectively.

[0107] By comparing Figure 2a , 2b , 2c and Figure 5 , Figure 3 and Figure 6 , Figure 4 and Figure 7 It is easy to find that compared with non-multi-period accumulation simulation, multi-period accumulation simulation can accurately display the changes in oil and gas saturation in different periods and the formation process of oil and gas migration paths. The detailed description of the oil and gas migration and accumulation process is more profound and detailed. The results are more consistent with geological understanding and have a wider range of applications.

[0108] Based on the same inventive concept, an embodiment of the present invention also provides a device for simulating a multi-stage oil and gas accumulation process. Since the principle of the problem solved by the device is similar to that of the aforementioned method for simulating a multi-stage oil and gas accumulation process, the implementation of the device can refer to the implementation of the aforementioned method, and the repeated parts will not be repeated.

[0109] The embodiment of the present invention provides a device for simulating the multi-stage oil and gas accumulation process, referring to Figure 8 As shown, including:

[0110] The minimum hydrocarbon expulsion threshold determination module 81 is used to determine the minimum hydrocarbon expulsion threshold required for each historical accumulation period according to the historical accumulation period of the oil and gas reservoir and the historical hydrocarbon expulsion process of the accumulation process;

[0111] The corresponding relationship determination module 82 is used to obtain the stratigraphic range involved in each stage of oil and gas migration by tracking the oil and gas migration path and analyzing the distribution range of the oil and gas reservoirs, and to associate the reservoir formation period with the stratigraphic range involved in each stage of oil and gas migration, so as to establish a corresponding relationship between the reservoir formation period and the stratigraphic range;

[0112] The simulation module 83 is used to simulate the multi-stage oil and gas accumulation process based on the accumulation stage and formation range corresponding to each hydrocarbon expulsion process of the accumulation process to be simulated.

[0113] An embodiment of the present invention provides a computing device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the aforementioned method for simulating the multi-stage oil and gas accumulation process is implemented.

[0114] An embodiment of the present invention provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the method for simulating the multi-stage oil and gas accumulation process as described above is implemented.

[0115] Obviously, those skilled in the art can make various changes to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these changes.

Claims

1. A method for simulating the multi-stage oil and gas accumulation process, characterized in that: include: According to the historical accumulation stages of oil and gas reservoirs and the hydrocarbon expulsion process of the accumulation process, the minimum hydrocarbon expulsion threshold required for each historical accumulation stage is determined; By tracking the oil and gas migration path and analyzing the distribution range of oil and gas reservoirs, the stratigraphic range involved in each stage of oil and gas migration is obtained, the reservoir formation stage is linked to the stratigraphic range involved in each stage of oil and gas migration, and the corresponding relationship between the reservoir formation stage and the stratigraphic range is established; By comparing each hydrocarbon expulsion process of the reservoir formation process to be simulated with the minimum hydrocarbon expulsion threshold required for the reservoir formation period, the reservoir formation period in which each hydrocarbon expulsion process of the reservoir formation process to be simulated is determined; and according to the corresponding relationship between the reservoir formation period and the formation range, the formation range corresponding to each hydrocarbon expulsion process of the reservoir formation process to be simulated is determined; Based on the accumulation period and formation range corresponding to each hydrocarbon expulsion process of the accumulation process to be simulated, the multi-stage oil and gas accumulation process is simulated.

2. The method according to claim 1, characterized in that The hydrocarbon expulsion process is: the percentage of the preset hydrocarbon expulsion amount in the hydrocarbon expulsion process to the total hydrocarbon expulsion amount.

3. The method according to claim 1, wherein the minimum hydrocarbon expulsion threshold required for each historical reservoir formation period is determined based on the historical reservoir formation period and the hydrocarbon expulsion process of the reservoir formation process, and comprises: Based on the study of historical oil and gas reservoir events, the total historical hydrocarbon expulsion of the oil and gas reservoir and the hydrocarbon expulsion required during the historical reservoir formation period are obtained; The minimum hydrocarbon expulsion threshold is calculated according to the following formula: Where: P i is the minimum hydrocarbon expulsion threshold required for each historical accumulation period; E i is the amount of hydrocarbon expulsion required for the formation of each historical accumulation period; E is the total historical hydrocarbon expulsion of the oil and gas reservoir, i is the historical accumulation period, i = 1, 2, 3...N.

4. The method according to claim 1, characterized in that By comparing each hydrocarbon expulsion process of the reservoir formation process to be simulated with the minimum hydrocarbon expulsion threshold required for the reservoir formation period, the reservoir formation period in which each hydrocarbon expulsion process of the reservoir formation process to be simulated is determined, including: When P exp ≧P N , i = N, the reservoir formation period to be simulated is the Nth period, and N is an integer; When P exp <P N , and P i ≤P exp <P i+1 , the reservoir formation period to be simulated is the i-th period; Where: P i is the minimum hydrocarbon expulsion threshold required for each historical accumulation period, P exp is the hydrocarbon expulsion process of the reservoir formation process to be simulated, i is the historical reservoir formation period, i=1, 2, 3...N.

5. The method according to claim 1, characterized in that Determining the stratigraphic range corresponding to each hydrocarbon expulsion process of the reservoir formation process to be simulated includes: According to the accumulation period in which each hydrocarbon expulsion process of the accumulation process to be simulated occurs, from the correspondence between the accumulation period and the stratigraphic range, the stratigraphic range involved in the oil and gas migration corresponding to the accumulation period of the accumulation process to be simulated is found as the stratigraphic range for oil and gas migration during simulation.

6. The method according to claim 1, characterized in that Based on the accumulation period and formation range corresponding to each hydrocarbon expulsion process of the accumulation process to be simulated, the multi-stage oil and gas accumulation process is simulated, including: As each hydrocarbon expulsion process of the simulated accumulation process develops continuously from small to large, the oil and gas migration range is limited by successively modifying the calculation control parameters of the formation range to be simulated, and the parameter values ​​of the non-simulated formation range remain unchanged. The multi-stage accumulation process of the hydrocarbon expulsion process within the preset range under the same geological model is simulated to obtain the corresponding oil and gas migration path map and oil saturation map.

7. The method according to any one of claims 1 to 6, characterized in that: The historical reservoir formation periods are obtained in advance by the following method: The historical oil and gas accumulation events are studied and the historical accumulation periods are determined based on the accumulation chronology method.

8. A device for simulating the multi-stage oil and gas accumulation process, characterized in that: include: The minimum hydrocarbon expulsion threshold determination module is used to determine the minimum hydrocarbon expulsion threshold required for each historical accumulation period according to the historical accumulation period of the oil and gas reservoir and the hydrocarbon expulsion process of the accumulation process; A corresponding relationship determination module is used to obtain the stratigraphic range involved in each phase of oil and gas migration by tracking the oil and gas migration path and analyzing the distribution range of oil and gas reservoirs, and to associate the reservoir formation period with the stratigraphic range involved in each phase of oil and gas migration to establish a corresponding relationship between the reservoir formation period and the stratigraphic range; The simulation module is used to simulate the multi-stage oil and gas accumulation process based on the accumulation stage and formation range corresponding to each hydrocarbon expulsion process of the accumulation process to be simulated.

9. A computing device, characterized in that include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method for simulating the multi-stage oil and gas accumulation process as described in any one of claims 1 to 7 when executing the program.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for simulating the multi-stage oil and gas accumulation process according to any one of claims 1 to 7 is implemented.

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