Secondary tight gas reservoir identification method, device, equipment and medium

Abstract

The invention belongs to the technical field of natural gas exploration and development, and particularly discloses a secondary tight gas reservoir identification method, device and equipment and a medium. According to the method, basin simulation is carried out by using gas reservoir simulation software, a burial hydrocarbon generation history diagram is obtained, reservoir forming time and main reservoir forming time are determined, and whether the reservoir forming time is later than the main reservoir forming time or not is judged; statistical analysis is carried out on different periods of reservoir forming groups, and the groups meeting the requirements are screened out; carrying out pressure verification on the screened groups and the groups forming the reservoir in the same period, and determining an identification result; on the basis of comprehensively analyzing research results of previous scholars, the identification method for systematically researching the secondary gas reservoir is innovated by means of software numerical simulation, a chemical analysis method and the like, a new thought is developed for searching for high-benefit exploration and development of the secondary gas reservoir, and the method is high in practicability, reliability and operability and suitable for popularization and application. The blindness and risk of natural gas exploration and development are reduced, and a geological basis is provided for low-cost and high-benefit exploration and development.

Description

Technical Field

[0001] The present invention belongs to the technical field of natural gas exploration and development, and in particular relates to a secondary tight gas reservoir identification method, device, equipment and medium. Background Art

[0002] In recent years, according to the tracking of oil and gas exploration, development and production and the development trend at home and abroad, it is an important strategic choice for oil and gas resources to find efficient and high-quality reserves and implement low-cost and high-efficiency oil and gas exploration and development. With the continuous advancement of oil and gas reservoir exploration and development, it is found that secondary oil and gas reservoirs are shallowly buried, have good physical properties, high production capacity, fast production construction, and high degree of utilization. They are typical high-efficiency and high-quality resources and are an important area of ​​low-cost and high-efficiency exploration and development in the near future. Domestic and foreign scholars have described the definition of secondary oil and gas reservoirs. Secondary gas reservoirs are proposed to distinguish primary oil and gas reservoirs. Primary oil and gas reservoirs are regarded as oil and gas matrix. New oil and gas reservoirs formed by the migration and accumulation of primary oil and gas reservoirs are called secondary gas reservoirs.

[0003] Secondary oil and gas reservoirs exist in the four major prototype basins of China's onshore fault, depression, foreland and craton, including the major large basins such as Songliao, Bohai, Ordos, Tarim and Qaidam, as well as small and medium-sized basins such as Jiuquan, Jianghan and Nanfang. The geological characteristics, accumulation conditions, resource potential, distribution patterns and exploration prospects of secondary oil and gas reservoirs have been studied and analyzed in detail. Some scholars have also used fluid history analysis technology (FHA) to determine the source and filling history of secondary oil and gas reservoirs, but there is a lack of systematic research on the methods of judging the formation of secondary gas reservoirs. Summary of the invention

[0004] The purpose of the present invention is to provide a method, device, equipment and medium for identifying secondary tight gas reservoirs, so as to solve the problem of lack of systematic research on methods for judging the formation of secondary gas reservoirs.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a method for identifying a secondary tight gas reservoir, comprising:

[0007] Divide the detection area into groups, use simulation software to simulate the basins of each group in the detection area, obtain the burial hydrocarbon generation history map, and determine the accumulation time of each group of the gas reservoir;

[0008] Determine the main reservoir-forming time and judge whether each group is formed in the same period as the main reservoir-forming time;

[0009] Conduct statistical analysis on groups of different reservoir formation periods and select groups that meet the requirements;

[0010] The screened groups and the groups formed in the same period are subjected to pressure verification to determine the identification results.

[0011] Furthermore, the determination of the main reservoir-forming time is specifically as follows:

[0012] When a certain accumulation time coincides with the peak period of hydrocarbon accumulation, this time is determined as the main accumulation time.

[0013] Furthermore, the determination of whether each group is formed in the same period as the main accumulation time is specifically as follows:

[0014] When the accumulation time of a group coincides with the main accumulation time, the group is classified as synchronous accumulation;

[0015] When the accumulation time of a certain group is inconsistent with the main accumulation time, the group is divided into accumulations in different periods.

[0016] Further, the statistical analysis specifically includes gas component comparison hydrocarbon component analysis and inclusion analysis;

[0017] In the analysis of gas component comparison and hydrocarbon component, the gas component analysis data is counted, and the upper layer and the lower layer are compared to divide the group into an upper layer without heavy hydrocarbon components and an upper layer with heavy hydrocarbon components;

[0018] In the inclusion analysis, the inclusion analysis data are statistically analyzed, and each group is divided into early inclusions and late inclusions to determine whether the inclusions contain hydrocarbon gas, and the early inclusion group without hydrocarbon gas is screened out.

[0019] Furthermore, the groups that meet the requirements are specifically selected as follows:

[0020] The groups that satisfy both the absence of heavy hydrocarbon components in the upper part and the absence of hydrocarbon gas in the early inclusions are screened out, and the remaining groups are eliminated.

[0021] Furthermore, the pressure verification of the selected groups and the groups formed in the same period specifically includes:

[0022] The upper research layer pressure P1 and the main gas reservoir pressure P2 of a group in the current pressure data are counted, and the upper research layer pressure P1' is calculated and simulated. The calculation formula for the simulated upper research layer pressure P1' is:

[0023] P1'=P2-Ht

[0024] Among them, P1' is the pressure of the upper research layer, P2 is the pressure of the lower main gas reservoir, H is the depth difference between the upper research layer and the lower layer, and t is the hydrostatic pressure gradient under ideal conditions, 0.01Mpa / m;

[0025] The paleopressure P3 of the upper research layer during the accumulation period and the paleopressure P4 of the main gas reservoir in the lower layer during the accumulation period in the current pressure data are counted, and the paleopressure P3' of the upper research layer during the accumulation period is calculated and simulated. The calculation formula for simulating the paleopressure P3' of the upper research layer during the accumulation period is:

[0026] P3'=P4-Ht

[0027] Among them, P3' is the simulated paleopressure during the accumulation period of the upper study layer, and P4 is the paleopressure during the accumulation period of the lower main gas reservoir.

[0028] Furthermore, the determination of the identification result specifically includes:

[0029] When the pressure P1 of the upper study layer is less than the simulated pressure P1' of the upper study layer, and the paleo-pressure P3 of the upper study layer during the reservoir formation period is less than the simulated paleo-pressure P3' of the upper study layer during the reservoir formation period, the group is a secondary gas reservoir;

[0030] When the upper study stratum pressure P1 is consistent with the simulated upper study stratum pressure P1', or the upper study stratum paleopressure P3 during the reservoir formation period is consistent with the simulated upper study stratum paleopressure P3' during the reservoir formation period, the group is a non-secondary gas reservoir.

[0031] In a second aspect, the present invention provides a secondary tight gas reservoir identification device, comprising:

[0032] The reservoir formation time determination module is used to divide the detection area into groups, perform basin simulation on each group in the detection area through simulation software, obtain the burial hydrocarbon generation history map, and determine the reservoir formation time of each group in the gas reservoir;

[0033] The synchronous accumulation judgment module is used to determine the main accumulation time and judge whether each group is synchronous with the main accumulation time;

[0034] The screening module is used to conduct statistical analysis on groups of different reservoir formation periods and screen out groups that meet the requirements;

[0035] The pressure verification module is a module for determining the identification results, and is used to perform pressure verification on the selected groups and the groups formed in the same period to determine the identification results.

[0036] In a third aspect, the present invention provides an electronic device comprising a processor and a memory, wherein the processor is used to execute a computer program stored in the memory to implement a secondary tight gas reservoir identification method as described in any one of the above.

[0037] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores at least one instruction, and when the at least one instruction is executed by a processor, a secondary tight gas reservoir identification method as described in any one of the above is implemented.

[0038] The present invention has at least the following beneficial effects:

[0039] 1. The present invention uses gas reservoir simulation software to simulate the basin, obtains the buried hydrocarbon generation history map, determines the accumulation time and the main accumulation time, and judges whether the accumulation time is later than the main accumulation time; statistical analysis is performed on groups of accumulation in different periods to screen out groups that meet the requirements; pressure verification is performed on the screened groups and groups of accumulation in the same period to determine the identification results; the present invention uses software numerical simulation, chemical analysis methods and other means to innovate a systematic research on the identification method of secondary gas reservoirs on the basis of comprehensive analysis of the research results of previous scholars, and opens up new ideas for finding high-efficiency exploration and development of secondary gas reservoirs. It has strong practicality, reliability and operability, reduces the blindness and risk of natural gas exploration and development, and provides a geological basis for achieving low-cost and high-efficiency exploration and development.

[0040] 2. The present invention establishes a more targeted and feasible method for determining the formation of secondary gas reservoirs to guide the efficient exploration and development of secondary gas reservoirs. At the same time, it further deepens the understanding of the formation of secondary gas reservoirs and provides theoretical support for the exploration of secondary gas reservoirs. After verification by exploration practice, it has achieved a reserve scale of hundreds of billions of cubic meters, which is of great significance for increasing reserves and production. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0042] In the attached picture:

[0043] Figure 1 A schematic diagram of a secondary tight gas reservoir identification method;

[0044] Figure 2 This is a diagram showing the relationship between the formation time and burial thermal evolution history of the Qian5 gas reservoir of the Shiqianfeng Formation in a certain area of ​​the basin;

[0045] Figure 3 This is the frequency distribution diagram of the homogenized temperature of the inclusions in Box 8 of a well in a certain area of ​​the basin;

[0046] Figure 4 This is the homogenization temperature frequency distribution diagram of the Qian5 inclusion of the Shiqianfeng Formation in a well in a certain area of ​​the basin;

[0047] Figure 5 This is a bar chart comparing the paleo-pressure of the Qian5 and He8 gas reservoirs of the Shiqianfeng Formation in a certain area of ​​the basin;

[0048] Figure 6 It is a structural block diagram of a secondary tight gas reservoir identification device of the present invention;

[0049] Figure 7 The present invention is a structural block diagram of an electronic device. DETAILED DESCRIPTION

[0050] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0051] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0052] Example 1

[0053] like Figure 1 As shown, a method for identifying secondary tight gas reservoirs comprises:

[0054] S1: Divide the detection area into groups, perform basin simulation on each group in the detection area through simulation software, obtain the burial hydrocarbon generation history map, and determine the accumulation time of each group of the gas reservoir;

[0055] Specifically, the basin simulation is performed using the petroleum system simulation software PetroMod or similar reservoir simulation software to obtain the burial hydrocarbon generation history map, and the formation time of the gas reservoir is determined in combination with the homogenization temperature of the inclusions;

[0056] S2: Determine the main accumulation time, judge whether each group is accumulated in the same period as the main accumulation time, and divide each group into accumulation in the same period and accumulation in different periods;

[0057] Specifically, when a certain reservoir-forming time coincides with the hydrocarbon-rising peak period, this time is determined to be the main reservoir-forming time;

[0058] When the accumulation time of a group coincides with the main accumulation time, the group is classified as synchronous accumulation and preliminarily considered as non-secondary accumulation;

[0059] When the accumulation time of a certain group is inconsistent with the main accumulation time, the group is divided into accumulations in different periods.

[0060] S3: Conduct statistical analysis on the groups of different reservoir formation periods and select the groups that meet the requirements;

[0061] Statistical analysis specifically includes gas component versus hydrocarbon component analysis, inclusion analysis;

[0062] In the analysis of gas component comparison and hydrocarbon component, the gas component analysis data is statistically analyzed, and the upper and lower layers are compared. The continuous gas reservoir is affected by the buoyancy differentiation effect. The heavy hydrocarbon components of the gas in the upper layer gas reservoir are significantly lower than those in the lower layer gas reservoir. Based on this, the group can be divided into the upper group without heavy hydrocarbon components and the upper group with heavy hydrocarbon components.

[0063] In the inclusion analysis, the inclusion analysis data were statistically analyzed, and each group was divided into early inclusions and late inclusions to determine whether the inclusions contained hydrocarbon gas, and the early inclusions without hydrocarbon gas were screened out;

[0064] The groups that satisfy both the absence of heavy hydrocarbon components in the upper part and the absence of hydrocarbon gas in the early inclusions are screened out, and the remaining groups are eliminated.

[0065] S4: Conduct pressure verification on the selected groups and the groups formed in the same period to determine the identification results;

[0066] Specifically, the pressure P1 of the upper research layer and the pressure P2 of the main gas reservoir in the lower layer of a group in the current pressure data are counted, and the pressure P1' of the upper research layer is calculated and simulated. The calculation formula for simulating the pressure P1' of the upper research layer is:

[0067] P1'=P2-Ht

[0068] Among them, P1' is the pressure of the upper research layer, P2 is the pressure of the lower main gas reservoir, H is the depth difference between the upper research layer and the lower layer, and t is the hydrostatic pressure gradient under ideal conditions, 0.01Mpa / m;

[0069] The paleopressure P3 of the upper research layer during the accumulation period and the paleopressure P4 of the main gas reservoir in the lower layer during the accumulation period in the current pressure data are counted, and the paleopressure P3' of the upper research layer during the accumulation period is calculated and simulated. The calculation formula for simulating the paleopressure P3' of the upper research layer during the accumulation period is:

[0070] P3'=P4-Ht

[0071] Among them, P3' is the paleo-pressure of the simulated upper research layer during the accumulation period, and P4 is the paleo-pressure of the lower main gas reservoir during the accumulation period;

[0072] When the pressure P1 of the upper study layer is less than the simulated pressure P1' of the upper study layer, and the paleo-pressure P3 of the upper study layer during the reservoir formation period is less than the simulated paleo-pressure P3' of the upper study layer during the reservoir formation period, the group is a secondary gas reservoir;

[0073] When the upper study stratum pressure P1 is consistent with the simulated upper study stratum pressure P1', or the upper study stratum paleopressure P3 during the reservoir formation period is consistent with the simulated upper study stratum paleopressure P3' during the reservoir formation period, the group is a non-secondary gas reservoir.

[0074] S5: output the discrimination result;

[0075] When there is no heavy hydrocarbon component in the upper part, and there is no hydrocarbon gas in the early inclusions, the pressure P1 of the upper study layer is less than the simulated pressure P1' of the upper study layer, and the paleopressure P3 of the upper study layer during the accumulation period is less than the simulated paleopressure P3' of the upper study layer during the accumulation period, the group is output as a secondary gas reservoir; the other groups are output as non-secondary gas reservoirs.

[0076] Example 2

[0077] This is further explained through a specific example of the Qian5 gas reservoir of the Shiqianfeng Formation in a certain area of ​​a basin.

[0078] The Qian5 section of this area is covered by Qian1-Qian4 mudstone, which is a relatively independent lithological trap without fracture communication. Mudstone is its main sealing function, and it is a gas reservoir that migrates upward from the same gas source. The gas reservoir characteristics meet the research conditions of the present invention. The theoretical method of the present invention is now used to determine its reservoir formation, including the following specific steps:

[0079] Step 1: Use the petroleum system simulation technology PetroMod to simulate the basin and obtain the burial hydrocarbon generation history map, such as Figure 2 As shown in Figure 2, the accumulation time is obtained: 80℃ is equivalent to 200Ma (late Triassic), while 160℃ is equivalent to 70-100Ma (late Cretaceous). Combined with the homogenization temperature of the inclusions, the Shihezi Formation experienced multiple stages of oil and gas filling from the late Triassic to the late Cretaceous, as shown in Figure 2. Figure 3 As shown in Figure 1, the Qian5 gas reservoir experienced a phase of filling, and the oil and gas filling time was mainly concentrated in the late Cretaceous. Figure 4 As shown;

[0080] Step 2: Shanxi Formation and Shihezi Formation experienced multiple phases of oil and gas filling from the end of Triassic to the end of Cretaceous, and the accumulation time of Shiqianfeng Formation was later than that of Shanxi Formation and Shihezi Formation;

[0081] Step 3, the natural gas composition analysis data of some exploration wells in a certain area of ​​a basin is shown in Table 1:

[0082] Table 1 Analysis of natural gas components in a certain area of ​​a basin

[0083]

[0084]

[0085] The natural gas components of the Upper Shihezi Formation and Shiqianfeng Formation have a high content of light hydrocarbons and a low content of heavy hydrocarbons. The CH4 content of the Qian5 gas reservoir is above 97%. From the Shiqianfeng Formation to the Lower Shihezi Formation and Shanxi Formation, the light hydrocarbon content in the natural gas components gradually decreases, while the heavy hydrocarbon content increases relatively; the methane content in the Qian5 gas reservoir components is generally high and there is no heavy hydrocarbon component;

[0086] Step 4: Based on the inclusion analysis data, the linearly distributed inclusions are divided into early and late stages. Both the early and late inclusion types of the Shihezi Formation contain hydrocarbon gas, while the early inclusion type of the 1,000-5th Formation contains no hydrocarbon gas, and only the late inclusion type contains hydrocarbon gas;

[0087] Step 5, by counting the pressure P1 of the upper research layer and the pressure P2 of the main gas reservoir in the lower layer of a group in the current pressure data, the main gas reservoir pressure P2 in the lower layer box 8 is 24.7MPa, and the ancient pressure P1 in the main gas reservoir period of the upper research layer is 8.2MPa. Using calculation formula 1, the simulated upper research layer pressure P1' is obtained to be 21.7MPa, and P1' is greater than P1;

[0088] P1'=P2-Ht

[0089] Among them, the depth difference between the two layers of H is 300 meters, and t is the hydrostatic pressure gradient of 0.01Mpa / m under ideal conditions.

[0090] Step 6: If the research results of the Qian5 gas reservoir of the Shiqianfeng Formation in a certain area of ​​the basin meet the requirements of steps 2, 3, 4 and 5 at the same time, then it can be determined that the gas reservoir in the studied layer is a secondary gas reservoir.

[0091] Example 3

[0092] like Figure 6 As shown, based on the same inventive concept as the above embodiment, the present invention also provides a secondary tight gas reservoir identification device, comprising:

[0093] The reservoir formation time determination module is used to divide the detection area into groups, perform basin simulation on each group in the detection area through simulation software, obtain the burial hydrocarbon generation history map, and determine the reservoir formation time of each group in the gas reservoir;

[0094] The synchronous accumulation judgment module is used to determine the main accumulation time and judge whether each group is synchronous with the main accumulation time;

[0095] The screening module is used to conduct statistical analysis on groups of different reservoir formation periods and screen out groups that meet the requirements;

[0096] The pressure verification module is a module for determining the identification results, and is used to perform pressure verification on the selected groups and the groups formed in the same period to determine the identification results.

[0097] Example 4

[0098] like Figure 7 As shown, the present invention also provides an electronic device 100 for implementing a method for identifying a secondary tight gas reservoir;

[0099] The electronic device 100 includes a memory 101 , at least one processor 102 , a computer program 103 stored in the memory 101 and executable on the at least one processor 102 , and at least one communication bus 104 .

[0100] The memory 101 can be used to store a computer program 103. The processor 102 implements the steps of a secondary tight gas reservoir identification method in Example 1 by running or executing the computer program stored in the memory 101 and calling the data stored in the memory 101.

[0101] The memory 101 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data (such as audio data) created according to the use of the electronic device 100, etc. In addition, the memory 101 may include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0102] At least one processor 102 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor 102 may be a microprocessor or any conventional processor, etc. The processor 102 is the control center of the electronic device 100, and uses various interfaces and lines to connect various parts of the entire electronic device 100.

[0103] The memory 101 in the electronic device 100 stores a plurality of instructions to implement a secondary tight gas reservoir identification method, and the processor 102 can execute the plurality of instructions to implement:

[0104] Divide the detection area into groups, use simulation software to simulate the basins of each group in the detection area, obtain the burial hydrocarbon generation history map, and determine the accumulation time of each group of the gas reservoir;

[0105] Determine the main reservoir-forming time and judge whether each group is formed in the same period as the main reservoir-forming time;

[0106] Conduct statistical analysis on groups of different reservoir formation periods and select groups that meet the requirements;

[0107] The screened groups and the groups formed in the same period are subjected to pressure verification to determine the identification results.

[0108] Example 5

[0109] If the module / unit integrated in the electronic device 100 is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. Computer-readable media may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory and read-only memory (ROM, Read-Only Memory).

[0110] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

[0111] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0112] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0113] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0114] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for identifying secondary tight gas reservoirs, characterized in that: include: Divide the detection area into groups, use simulation software to simulate the basins of each group in the detection area, obtain the burial hydrocarbon generation history map, and determine the accumulation time of each group of the gas reservoir; Determine the main reservoir-forming time and judge whether each group is formed in the same period as the main reservoir-forming time; Conduct statistical analysis on groups of different reservoir formation periods and select groups that meet the requirements; The screened groups and the groups formed in the same period are subjected to pressure verification to determine the identification results.

2. A method for identifying secondary tight gas reservoirs according to claim 1, characterized in that: The main reservoir formation time is specifically determined as follows: When a certain accumulation time coincides with the peak period of hydrocarbon accumulation, this time is determined as the main accumulation time.

3. A method for identifying secondary tight gas reservoirs according to claim 1, characterized in that: The specific method for judging whether each group is formed in the same period as the main reservoir is as follows: When the accumulation time of a group coincides with the main accumulation time, the group is classified as synchronous accumulation; When the accumulation time of a certain group is inconsistent with the main accumulation time, the group is divided into accumulations in different periods.

4. A method for identifying secondary tight gas reservoirs according to claim 1, characterized in that: The statistical analysis specifically includes gas component comparison hydrocarbon component analysis and inclusion analysis; In the analysis of gas component comparison and hydrocarbon component, the gas component analysis data is counted, and the upper layer and the lower layer are compared to divide the group into an upper layer without heavy hydrocarbon components and an upper layer with heavy hydrocarbon components; In the inclusion analysis, the inclusion analysis data are statistically analyzed, and each group is divided into early inclusions and late inclusions to determine whether the inclusions contain hydrocarbon gas, and the early inclusion group without hydrocarbon gas is screened out.

5. A method for identifying secondary tight gas reservoirs according to claim 4, characterized in that: The groups that meet the requirements are specifically: The groups that satisfy both the absence of heavy hydrocarbon components in the upper part and the absence of hydrocarbon gas in the early inclusions are screened out, and the remaining groups are eliminated.

6. A method for identifying secondary tight gas reservoirs according to claim 1, characterized in that: The pressure verification of the selected groups and the groups formed in the same period specifically includes: The upper research layer pressure P1 and the main gas reservoir pressure P2 of a group in the current pressure data are counted, and the upper research layer pressure P1' is calculated and simulated. The calculation formula for the simulated upper research layer pressure P1' is: P1'=P2-Ht Among them, P1' is the pressure of the upper research layer, P2 is the pressure of the lower main gas reservoir, H is the depth difference between the upper research layer and the lower layer, and t is the hydrostatic pressure gradient under ideal conditions, 0.01Mpa / m; The paleopressure P3 of the upper research layer during the accumulation period and the paleopressure P4 of the main gas reservoir in the lower layer during the accumulation period in the current pressure data are counted, and the paleopressure P3' of the upper research layer during the accumulation period is calculated and simulated. The calculation formula for simulating the paleopressure P3' of the upper research layer during the accumulation period is: P3'=P4-Ht Among them, P3' is the simulated paleopressure during the accumulation period of the upper study layer, and P4 is the paleopressure during the accumulation period of the lower main gas reservoir.

7. A method for identifying secondary tight gas reservoirs according to claim 6, characterized in that: The determination of the identification result specifically includes: When the pressure P1 of the upper study layer is less than the simulated pressure P1' of the upper study layer, and the paleo-pressure P3 of the upper study layer during the reservoir formation period is less than the simulated paleo-pressure P3' of the upper study layer during the reservoir formation period, the group is a secondary gas reservoir; When the upper study stratum pressure P1 is consistent with the simulated upper study stratum pressure P1', or the upper study stratum paleopressure P3 during the reservoir formation period is consistent with the simulated upper study stratum paleopressure P3' during the reservoir formation period, the group is a non-secondary gas reservoir.

8. A secondary tight gas reservoir identification device, characterized in that: include: The reservoir formation time determination module is used to divide the detection area into groups, perform basin simulation on each group in the detection area through simulation software, obtain the burial hydrocarbon generation history map, and determine the reservoir formation time of each group in the gas reservoir; The synchronous accumulation judgment module is used to determine the main accumulation time and judge whether each group is synchronous with the main accumulation time; The screening module is used to conduct statistical analysis on groups of different reservoir formation periods and screen out groups that meet the requirements; The pressure verification module is a module for determining the identification results, and is used to perform pressure verification on the selected groups and the groups formed in the same period to determine the identification results.

9. An electronic device, characterized in that: It comprises a processor and a memory, wherein the processor is used to execute a computer program stored in the memory to implement a secondary tight gas reservoir identification method as claimed in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores at least one instruction, and when the at least one instruction is executed by the processor, a secondary tight gas reservoir identification method as described in any one of claims 1 to 7 is implemented.

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