Oil and gas block geological evaluation method and device, electronic equipment and storage medium

Abstract

The embodiment of the invention provides an oil and gas block geology evaluation method and device, electronic equipment and a storage medium. The method comprises the steps that an oil and gas geology unit evaluation system is established; corresponding evaluation standards are formulated according to basins and fields, and typical evaluation comparison areas are established; dividing the target block into one or more geological evaluation units; assigning each evaluation index corresponding to each geological evaluation unit by adopting a mode of combining quantitative model estimation, typical evaluation comparison area analogy and expert assignment; determining an oil and gas condition probability index and a resource strategic value index of each geological evaluation unit; determining the classification level of the target block according to the oil and gas condition probability index and the resource strategic value index of each geological evaluation unit in the target block; and according to the oil and gas condition probability index and the resource strategic value index of each geological evaluation unit in the target block, determining a comprehensive ranking index of the target block and ranking of the target block in the plurality of blocks.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas exploration, and specifically to a method, device, electronic equipment and storage medium for geological evaluation of oil and gas blocks. Background Art

[0002] Oil and gas mining rights blocks (hereinafter referred to as oil and gas blocks) are the foundation of exploration and development. In recent years, the stock of blocks of various oil companies has been decreasing year by year, and the situation is grim. The main goal of strategic selection of major oil companies is to evaluate the blank areas of mining rights, select favorable blocks, and obtain more new blocks.

[0003] At present, the evaluation methods commonly used in oil and gas block evaluation research mainly include PDSys method, eleven parameter method, four factor method, two factor method and other types [Exploration target evaluation method [J]. World Petroleum Industry, 1998, (08): 10-14. Song Jianguo, Zhang Guangya]. In terms of patent literature, Tang Ying used gray theory, hierarchical analysis method, fuzzy mathematics and other algorithms to carry out block evaluation [A method for selecting potential commercial areas in oil and gas exploration: Beijing, CN105787642A[P]. 2016-07-20], and Wang Baohua used the geological two-factor model to carry out block-geological unit two-level evaluation [Quantitative evaluation method and system for oil and gas mining rights blocks: Beijing, CN113743696A[P]. 2021-12-03]. These methods all use geological analysis to sort out and summarize the main geological factors that affect the geological potential of the block, and on this basis form an evaluation index and parameter system, and realize the unified queuing or classification of blocks by constructing an evaluation model. The above methods introduce relatively more on the selection area evaluation methods, but there are relatively few studies on the assignment of evaluation parameters. Regarding the assignment of evaluation indicators, only Lu Jianlin established an indicator evaluation assignment method based on a neural network algorithm [Petroleum Geology Evaluation Indicator Assignment Method: Beijing, CN112132369A[P].2020-12-25]. The literature introduces that in the selection area evaluation process, there is a large degree of subjectivity in the evaluation and assignment of geological parameters. Therefore, AI artificial intelligence algorithm is used to carry out evaluation assignment, which improves the objectivity of the evaluation to a certain extent in practical applications.

[0004] However, in the current application of conventional block evaluation, the existing methods have the following problems: (1) The assignment of values ​​to various geological evaluation indicators in geological evaluation is mainly based on the expert assignment method, which lacks a quantitative calculation method. The use of AI algorithm evaluation requires a large number of sample areas (nearly 10,000 samples are required), while the number of successful blocks in oil and gas exploration is relatively small, which cannot meet the needs of establishing an algorithm training sample library; (2) The evaluation of blocks with low exploration degree is mainly carried out by analogy, and the existing block management method is difficult to meet the overall comparative study of the same structural domain.

[0005] It should be pointed out that the information disclosed in the background technology section of this application is only intended to deepen the understanding of the general background technology of this application, and should not be regarded as an admission or suggestion in any form that the information constitutes prior art already known to those skilled in the art. Summary of the invention

[0006] In view of this, the present application provides an oil and gas block geological evaluation method, device, electronic equipment and storage medium to help solve the problems existing in the prior art.

[0007] In a first aspect, an embodiment of the present application provides a method for geological evaluation of an oil and gas block, comprising:

[0008] Establish an evaluation system for oil and gas geological units;

[0009] According to the oil and gas geological unit evaluation system, corresponding evaluation standards are formulated for each basin and field, and typical evaluation comparison areas are established;

[0010] Divide the target area into one or more geological evaluation units;

[0011] The evaluation indicators corresponding to each geological evaluation unit are assigned values ​​by combining quantitative model estimation, typical evaluation comparison area analogy and expert assignment;

[0012] Determine the oil and gas condition probability index and resource strategic value index of each geological evaluation unit according to the assignment results of various evaluation indicators corresponding to each geological evaluation unit;

[0013] Determining the classification level of the target block according to the oil and gas condition probability index and resource strategic value index of each geological evaluation unit in the target block;

[0014] According to the oil and gas condition probability index and resource strategic value index of each geological evaluation unit in the target block, the comprehensive ranking index of the target block is determined, and the ranking of the target block among multiple blocks is determined according to the comprehensive ranking index.

[0015] In a possible implementation, the oil and gas geological unit evaluation system includes evaluation indicators corresponding to oil and gas conditional probability, resource strategic value and reliability, and evaluation parameters corresponding to each of the evaluation indicators.

[0016] In a possible implementation, corresponding evaluation standards are formulated for each basin and field, and typical evaluation comparison areas are established, including:

[0017] According to the geotectonic unit-basin division, the target area is divided into a primary structural area and a secondary structural area, wherein each of the primary structural areas includes a plurality of the secondary structural areas, and the same secondary structural areas have similar geological evolution characteristics;

[0018] Establish evaluation standards for marine carbonate rocks, continental conventional clastic rocks, and continental tight oil and gas fields according to the secondary structural zones;

[0019] Select areas with a high degree of geological understanding, and establish typical evaluation and comparison areas in secondary structural zones and fields.

[0020] In a possible implementation, dividing the target block into one or more geological evaluation units includes:

[0021] Based on basins, the reservoir assemblages are divided according to the characteristics of oil and gas accumulation;

[0022] According to the reservoir combination, the target block is divided into one or more geological evaluation units.

[0023] In a possible implementation, the method of combining quantitative model estimation, typical evaluation comparison area analogy and expert assignment is used to assign values ​​to the evaluation indicators corresponding to each geological evaluation unit, including:

[0024] According to the evaluation parameters of each geological evaluation unit and the quantitative model, the probability of existence of source conditions, reservoir conditions, preservation conditions, trap conditions and matching conditions of each geological evaluation unit is estimated;

[0025] Assigning values ​​to the resource potential and engineering adaptability of each geological evaluation unit using a petroleum geological evaluation index assignment method;

[0026] By using the evaluation criteria corresponding to the target block and combining with typical evaluation comparison areas, the probability of existence of source conditions, reservoir conditions, preservation conditions, trap conditions, matching conditions, resource potential and engineering adaptability of each geological evaluation unit are adjusted through expert assignment.

[0027] In a possible implementation, the estimating the probability of existence of source conditions, reservoir conditions, preservation conditions, trap conditions and matching conditions of each geological evaluation unit according to the evaluation parameters of each geological evaluation unit and the quantitative model includes:

[0028] According to the hydrocarbon source quality, hydrocarbon source scale and hydrocarbon source evolution degree of each geological evaluation unit, the probability of existence of hydrocarbon source conditions in each geological evaluation unit is estimated;

[0029] According to the reservoir properties and reservoir scale of each geological evaluation unit, the probability of existence of the reservoir condition of each geological evaluation unit is estimated;

[0030] According to the regional cap rock lithology, regional cap rock thickness and the degree of later damage of each geological evaluation unit, the probability of existence of the preservation condition of each geological evaluation unit is estimated;

[0031] According to the trap development degree and trap implementation degree of each geological evaluation unit, the probability of existence of the trap condition of each geological evaluation unit is estimated;

[0032] According to the spatial matching, temporal matching and transport system of each geological evaluation unit, the existence probability of the matching condition of each geological evaluation unit is estimated.

[0033] In a possible implementation, the calculation formula of the oil and gas condition probability index is:

[0034] PI 油气 =(P 烃源 ·P 储层 ·P 圈闭 ·P 保存 ·P 匹配 ) 2 / 5

[0035] Among them, PI 油气 is the oil and gas conditional probability index, P 烃源 is the probability of existence of hydrocarbon source conditions, P 储层 is the probability of reservoir condition existence, P 保存 is the probability of existence of the preservation condition, P 圈闭 is the probability of existence of the trap condition, P 匹配 is the probability of matching condition.

[0036] In a possible implementation, determining the classification level of the target block according to the oil and gas condition probability index and resource strategic value index of each geological evaluation unit in the target block includes:

[0037] Determine the classification level of each geological evaluation unit according to the oil and gas condition probability index and resource strategic value index of each geological evaluation unit, and the oil and gas condition probability index and resource strategic value index evaluation template;

[0038] The classification level of the target block is determined according to the classification level of each of the geological evaluation units in the target block.

[0039] In a possible implementation, determining the classification level of the target block according to the classification level of each of the geological evaluation units in the target block includes:

[0040] The classification level corresponding to the geological evaluation unit with the highest classification level in the target block is used as the classification level of the target block.

[0041] In a possible implementation, the calculation formula of the comprehensive ranking index is:

[0042]

[0043] Among them, Q is the comprehensive ranking index, S is the target block area, S i is the overlapping area between the i-th geological evaluation unit and the target block, PI i is the oil and gas condition probability index of the i-th geological evaluation unit, QI i is the resource strategic value index of the ith geological evaluation unit, and n is the number of geological evaluation units.

[0044] In a possible implementation, the method further includes:

[0045] The reliability of each geological evaluation unit in the target block is estimated according to the data reliability and knowledge level of each geological evaluation unit in the target block.

[0046] In a second aspect, an embodiment of the present application provides a geological evaluation device for an oil and gas block, comprising:

[0047] The oil and gas geological unit evaluation system establishment module is used to establish the oil and gas geological unit evaluation system;

[0048] The typical evaluation comparison area module is used to formulate corresponding evaluation standards by basin and field according to the oil and gas geological unit evaluation system, and establish typical evaluation comparison areas;

[0049] A geological evaluation unit division module is used to divide the target block into one or more geological evaluation units;

[0050] An evaluation index assignment module is used to assign values ​​to various evaluation indicators corresponding to each geological evaluation unit by combining quantitative model estimation, typical evaluation comparison area analogy and expert assignment;

[0051] An oil and gas condition probability index and resource strategic value index determination module, used to determine the oil and gas condition probability index and resource strategic value index of each geological evaluation unit according to the assignment results of various evaluation indicators corresponding to each geological evaluation unit;

[0052] A classification level determination module, used to determine the classification level of the target block according to the oil and gas condition probability index and resource strategic value index of each geological evaluation unit in the target block;

[0053] A ranking determination module is used to determine the comprehensive ranking index of the target block according to the oil and gas condition probability index and the resource strategic value index of each geological evaluation unit in the target block, and determine the ranking of the target block among multiple blocks according to the comprehensive ranking index.

[0054] In a third aspect, an embodiment of the present application provides an electronic device, including:

[0055] processor;

[0056] Memory;

[0057] And a computer program, wherein the computer program is stored in the memory, and the computer program includes instructions, and when the instructions are executed by the processor, the electronic device executes any one of the methods described in the first aspect.

[0058] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored program, wherein when the program is running, the device where the computer-readable storage medium is located is controlled to execute any one of the methods described in the first aspect.

[0059] The technical solution provided by the embodiment of the present application has at least the following advantages:

[0060] (1) Taking the geological evaluation unit as the basic evaluation object, a two-level evaluation of geological evaluation unit and block was carried out, which effectively solved the classification and ranking problems of oil and gas blocks under the superposition of multiple geological evaluation units;

[0061] (2) By combining quantitative model estimation, typical evaluation comparison area analogy and expert assignment, each geological evaluation unit is assigned a value for each evaluation index, which effectively improves the scientificity and objectivity of geological area selection;

[0062] (3) The results calculated by this method can not only provide classification and ranking of blocks, but also classify and rank the advantages and disadvantages of each geological evaluation unit within the block, which can provide a reference for the setting of mining rights in blank areas and the optimization of existing blocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0064] Figure 1 A schematic diagram of a flow chart of a method for geological evaluation of oil and gas blocks provided in an embodiment of the present application;

[0065] Figure 2 This application also provides a structural block diagram of an oil and gas block geological evaluation device;

[0066] Figure 3 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0067] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0068] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0069] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0070] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0071] In view of the problem in the prior art that "in geological evaluation, the assignment of values ​​to various geological evaluation indicators is mainly based on expert assignment method, lacking quantitative calculation method, and the use of AI algorithm evaluation requires a large number of sample areas (requiring nearly 10,000 samples), and relatively few blocks are successfully obtained in oil and gas exploration, which cannot meet the needs of establishing an algorithm training sample library; the evaluation of blocks with low exploration degree is mainly carried out by analogy, and the existing block management method is difficult to meet the overall comparative study of the same structural domain", the embodiment of the present application provides a geological evaluation method for oil and gas blocks. According to the characteristics of conventional oil and gas selection areas, based on geological research and analysis, evaluation indicators and evaluation parameters are determined according to the probability of oil and gas conditions, resource value, and reliability. Corresponding evaluation standards are formulated according to different basins and different fields, and a two-level evaluation of geological evaluation units and blocks is carried out. During the evaluation, a combination of quantitative model estimation, typical evaluation comparison area analogy and expert assignment is used to assign values ​​to the evaluation indicators corresponding to each of the geological evaluation units, and finally the target block and the ranking of the geological evaluation units in the target block are determined by evaluation. Further combined with the planar position of each geological evaluation unit, suggestions for block advance and retreat (including reduction) can be put forward, which is an effective support for block evaluation and optimization work.

[0072] See also Figure 1 , is a flow chart of a method for geological evaluation of oil and gas blocks provided in an embodiment of the present application. Figure 1 As shown, it mainly includes the following steps.

[0073] Step S101: Establish an oil and gas geological unit evaluation system.

[0074] In the specific implementation, we can refer to the characteristics of the selected areas in the marine and continental conventional oil and gas fields, and select and determine the evaluation indicators and evaluation parameters in terms of oil and gas conditional probability, resource strategic value and reliability, as shown in Table 1.

[0075] Table 1:

[0076]

[0077]

[0078] It should be pointed out that the specific method for establishing the oil and gas geological unit evaluation system can be found in the description in patent CN112132369A, which will not be repeated here for the sake of brevity.

[0079] Step S102: According to the oil and gas geological unit evaluation system, corresponding evaluation standards are formulated by basin and field, and typical evaluation comparison areas are established.

[0080] For example, first, according to the tectonic unit-basin zoning of China, the national mining rights are divided into 7 primary tectonic zones and 27 secondary tectonic zones to carry out zoning management of the national oil and gas basins, among which the same secondary tectonic zones have similar geological evolution characteristics. Then, according to the secondary tectonic zones, the evaluation standards for marine carbonate rocks, continental conventional clastic rocks, and continental tight oil and gas are gradually established based on the evaluation system of oil and gas geological units; finally, areas with relatively high geological understanding are selected to establish typical evaluation comparison areas in secondary tectonic zones and fields.

[0081] Step S103: Divide the target block into one or more geological evaluation units.

[0082] Specifically, based on the basin, the reservoir combinations are divided according to the characteristics of oil and gas accumulation. One reservoir combination may contain one or more strata. Taking into account the original deposition and later tectonic transformation characteristics, the target block is divided into one or more geological evaluation units according to the reservoir combination.

[0083] Step S104: using a combination of quantitative model estimation, typical evaluation comparison area analogy and expert assignment to assign values ​​to various evaluation indicators corresponding to each geological evaluation unit.

[0084] First, based on the evaluation parameters of each quality evaluation unit and the quantitative model, the probability of existence of source conditions, reservoir conditions, preservation conditions, closure conditions and matching conditions of each geological evaluation unit is estimated. The estimation method of each evaluation index is explained below.

[0085] 1) Probability of existence of hydrocarbon source conditions.

[0086] The probability evaluation of hydrocarbon source conditions includes three processes: hydrocarbon source quality evaluation, hydrocarbon source scale evaluation, and hydrocarbon source evolution degree evaluation. The three processes follow the "barrel principle".

[0087] Among them, the quality of hydrocarbon source is evaluated from three aspects: source rock lithology, organic matter type, and TOC. The evaluation focuses on the weight of experimental measurement data. Specifically, the evaluation of hydrocarbon source quality is shown in Formula 1.

[0088] Formula 1:

[0089]

[0090] Among them, P 品质 ,P 规模 ,P 演化 , to evaluate P 烃源 The evaluation parameter factor ranges from 0 to 1. k is the attention weight for the measured TOC value when evaluating the quality of source rocks, which is generally between 1 and 5. The larger the weight, the higher the attention.

[0091] Let P min =min{P 品质 , P 规模 , P 演化}, where P 规模 =P 厚度 , P 演化 =P Ro , using the model shown in Formula 2 to calculate P 品质 , P 规模 , P 演化 Perform normalization.

[0092] Formula 2:

[0093] SP 品质 =P min ×(1+(P 品质 -P min )cos((P 品质 -P min )π / 2)))

[0094] SP 规模 =P min ×(1+(P 规模 -P min )cos((P 规模 -P min )π / 2)))

[0095] SP 演化 =P min ×(1+(P 演化 -P min )cos((P 演化 -P min )π / 2)))

[0096] Furthermore, Formula 3 is used to calculate the probability of existence of hydrocarbon source conditions.

[0097] Formula 3:

[0098]

[0099] 2) Probability of existence of reservoir conditions.

[0100] The evaluation of reservoir existence probability includes two processes: reservoir physical properties and reservoir scale.

[0101] Among them, reservoir physical properties are evaluated from four aspects: favorable phase zone, reservoir lithology, reservoir space, and porosity, and reservoir scale is evaluated according to reservoir thickness. Specifically, the evaluation of reservoir physical properties is shown in Formula 4.

[0102] Formula 4:

[0103]

[0104] Among them, P 相带 ,P 岩性 ,P 空间 ,P 孔隙度 ,P 规模 , to evaluate P 储层 The evaluation parameter factor ranges from 0 to 1. k is the attention weight for the measured TOC value when evaluating reservoir properties, which is generally between 1 and 5. The larger the weight, the higher the attention.

[0105] Let P min =min{P property, P scale}, where P 规模 =P 厚度 , using the following formula five pairs of P 物性 , P 规模 Perform normalization.

[0106] Formula 5:

[0107] SP 物性 =P min ×(1+(P 物性 -P min )cos((P 物性 -P min )π / 2)))

[0108] SP 规模 =P min ×(1+(P 规模 -P min )cos((P 规模 -P min )π / 2)))

[0109] Furthermore, Formula 6 is used to calculate the probability of reservoir condition existence.

[0110] Formula 6:

[0111]

[0112] 3) Probability of existence of preservation conditions.

[0113] The probability of existence of preservation conditions is evaluated from three aspects: regional cover rock lithology, regional cover rock thickness, and the degree of later damage. Specifically, the evaluation of the probability of existence of preservation conditions is shown in Formula 7.

[0114] Formula 7:

[0115]

[0116] Among them, P 岩性 , P 厚度 , P 破坏 To evaluate P 储层The evaluation parameter factor ranges from 0 to 1.

[0117] 4) Probability of existence of closure conditions.

[0118] The probability of existence of the trap condition is evaluated from two aspects: the degree of trap development and the degree of trap implementation. Specifically, the evaluation of the probability of existence of the trap condition is shown in Formula 8.

[0119] Formula 8:

[0120]

[0121] Among them, P 发育 ,P 落实 To evaluate P 圈闭 The evaluation parameter factor ranges from 0 to 1.

[0122] 5) Probability of existence of matching conditions.

[0123] The probability of existence of matching conditions is evaluated from three aspects: spatial matching, temporal matching, and transmission system. Let P min =min{P 空间 , P 时间 , P 输导}, using the following formula nine pairs of P 空间 , P 时间 , P 输导 Perform normalization.

[0124] Formula 9:

[0125] SP 空间 =P min ×(1+(P 空间 -P min )cos((P 空间 -P min )π / 2)))

[0126] SP 时间 =P min ×(1+(P 时间 -P min )cos((P 时间 -P min )π / 2)))

[0127] SP 输导 =P min ×(1+(P 输导 -P min )cos((P 输导 -P min )π / 2)))

[0128] Furthermore, Formula 10 is used to calculate the probability of the existence of the matching condition.

[0129] Formula 10:

[0130]

[0131] Where P 空间 , P 时间 , P 输导 To evaluate P 匹配 The evaluation parameter factor ranges from 0 to 1.

[0132] Secondly, the resource potential and engineering adaptability of each geological evaluation unit are assigned using the petroleum geological evaluation index assignment method. The specific assignment method can be referred to the description in patent CN112132369A, which will not be repeated here for the sake of brevity.

[0133] Finally, by using the evaluation criteria corresponding to the target block and the typical evaluation comparison area, the probability of existence of source conditions, reservoir conditions, preservation conditions, trap conditions, matching conditions, resource potential and engineering adaptability of each geological evaluation unit are adjusted through expert assignment. It should be pointed out that the typical evaluation comparison area is preferably selected in the same secondary structural area and the same field.

[0134] Step S105: Determine the oil and gas condition probability index and resource strategic value index of each geological evaluation unit according to the assignment results of various evaluation indicators corresponding to each geological evaluation unit.

[0135] Specifically, the calculation formula of the oil and gas condition probability index is shown in Formula 11.

[0136] Formula 11:

[0137] PI 油气 =(P 烃源 ·P 储层 ·P 圈闭 ·P 保存 ·P 匹配 ) 2 / 5

[0138] Among them, PI 油气 is the oil and gas conditional probability index, P 烃源 is the probability of existence of hydrocarbon source conditions, P 储层 is the probability of reservoir condition existence, P 保存 is the probability of existence of the preservation condition, P 圈闭 is the probability of existence of the trap condition, P 匹配 is the probability of matching condition.

[0139] The calculation method of the resource strategic value index can refer to the description in patent CN112132369A. For the sake of brevity, it will not be repeated here.

[0140] In a possible implementation, the reliability of the geological evaluation unit can also be evaluated from two aspects: data reliability and knowledge level. The specific evaluation formula is shown in Formula 12.

[0141] Formula 12:

[0142] U 可靠 =1-(P 资料 ×P 认识 ) 1 / 2

[0143] Among them, P 资料 , P 认识 To evaluate P 可靠 The evaluation parameter factor ranges from 0 to 1.

[0144] Step S106: Determine the classification level of the target block according to the oil and gas condition probability index and resource strategic value index of each geological evaluation unit in the target block.

[0145] Specifically, the classification level of each geological evaluation unit can be determined based on the oil and gas condition probability index and resource strategic value index of each geological evaluation unit, as well as the oil and gas condition probability index and resource strategic value index evaluation template; the classification level of the target block can be determined based on the classification level of each geological evaluation unit in the target block.

[0146] In a specific implementation, when the target block contains multiple geological units, the classification level of the target block is determined by the "highest" principle. That is, the classification level corresponding to the geological evaluation unit with the highest classification level in the target block is used as the classification level of the target block. For example, the classification level is I>II1>II2>III.

[0147] Among them, the contents of the oil and gas condition probability index and resource strategic value index evaluation template can be found in the description in patent CN113743696A. For the sake of brevity, they will not be repeated here.

[0148] Step S107: Determine the comprehensive ranking index of the target block according to the oil and gas condition probability index and resource strategic value index of each geological evaluation unit in the target block, and determine the ranking of the target block among multiple blocks according to the comprehensive ranking index.

[0149] Specifically, the calculation formula for the comprehensive ranking index is shown in Formula 13.

[0150] Formula 13:

[0151]

[0152] Among them, Q is the comprehensive ranking index, S is the target block area, Si is the overlapping area between the i-th geological evaluation unit and the target block, PI i is the oil and gas condition probability index of the i-th geological evaluation unit, QI i is the resource strategic value index of the ith geological evaluation unit, and n is the number of geological evaluation units.

[0153] It can be understood that when there are multiple target blocks, the ranking of the target block among the multiple blocks is determined according to the comprehensive ranking index of each target block.

[0154] The technical solution provided by the embodiment of the present application has at least the following advantages:

[0155] (1) Taking the geological evaluation unit as the basic evaluation object, a two-level evaluation of geological evaluation unit and block was carried out, which effectively solved the classification and ranking problems of oil and gas blocks under the superposition of multiple geological evaluation units;

[0156] (2) By combining quantitative model estimation, typical evaluation comparison area analogy and expert assignment, each geological evaluation unit is assigned a value for each evaluation index, which effectively improves the scientificity and objectivity of geological area selection;

[0157] (3) The results calculated by this method can not only provide classification and ranking of blocks, but also classify and rank the advantages and disadvantages of each geological evaluation unit within the block, which can provide a reference for the setting of mining rights in blank areas and the optimization of existing blocks.

[0158] For ease of understanding, the oil and gas block geological evaluation method provided in the embodiment of the present application is exemplarily described below in conjunction with a specific implementation method.

[0159] Specifically, a geological evaluation was conducted on three conventional oil and gas blocks in a certain exploration area, with an area of ​​600 km 2 、900Km 2 , 1000Km 2 According to the above method, the area is divided into 5 geological evaluation units, the evaluation indicators of each geological evaluation unit are assigned, and the PI and QI values ​​of each geological evaluation unit are calculated respectively, so as to determine the classification level of each geological evaluation unit and the ranking of each conventional oil and gas block. The specific data are shown in Table 2.

[0160] Table 2:

[0161]

[0162]

[0163] It should be noted that the reliability U of the geological evaluation unit can be used as an evaluation reference. For example, among the blocks with good evaluation, the blocks with high uncertainty are discarded first; among the blocks with poor evaluation, the blocks with small uncertainty are invested first.

[0164] Corresponding to the above-mentioned embodiments, the present application also provides a geological evaluation device for oil and gas blocks.

[0165] See also Figure 2 , which is a structural block diagram of an oil and gas block geological evaluation device provided in this application. Figure 2 As shown, it mainly includes the following modules.

[0166] The oil and gas geological unit evaluation system establishment module 301 is used to establish the oil and gas geological unit evaluation system;

[0167] Typical evaluation comparison area module 302 is used to formulate corresponding evaluation standards by basin and field according to the oil and gas geological unit evaluation system, and establish typical evaluation comparison areas;

[0168] A geological evaluation unit division module 303 is used to divide the target block into one or more geological evaluation units;

[0169] An evaluation index assignment module 304 is used to assign values ​​to various evaluation indexes corresponding to each geological evaluation unit by combining quantitative model estimation, typical evaluation comparison area analogy and expert assignment;

[0170] The oil and gas condition probability index and resource strategic value index determination module 305 is used to determine the oil and gas condition probability index and resource strategic value index of each geological evaluation unit according to the assignment results of the evaluation indicators corresponding to each geological evaluation unit;

[0171] A classification level determination module 306 is used to determine the classification level of the target block according to the oil and gas condition probability index and resource strategic value index of each geological evaluation unit in the target block;

[0172] The ranking determination module 307 is used to determine the comprehensive ranking index of the target block according to the oil and gas condition probability index and resource strategic value index of each geological evaluation unit in the target block, and determine the ranking of the target block among multiple blocks according to the comprehensive ranking index.

[0173] It should be pointed out that the specific contents involved in the embodiments of the present application can be found in the description of the above method embodiments, and for the sake of brevity, they will not be repeated here.

[0174] Corresponding to the above embodiment, an embodiment of the present application further provides an electronic device.

[0175] See also Figure 3 , is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 3 As shown, the electronic device 400 may include: a processor 401, a memory 402 and a communication unit 403. These components communicate via one or more buses. Those skilled in the art will appreciate that the electronic device structure shown in the figure does not limit the embodiments of the present application, and it may be a bus structure or a star structure, and may include more or fewer components than shown in the figure, or combine certain components, or arrange components differently.

[0176] The communication unit 403 is used to establish a communication channel so that the electronic device can communicate with other devices.

[0177] The processor 401 is the control center of the electronic device. It uses various interfaces and lines to connect various parts of the entire electronic device. It runs or executes software programs and / or modules stored in the memory 402, and calls data stored in the memory to perform various functions of the electronic device and / or process data. The processor can be composed of an integrated circuit (IC), for example, it can be composed of a single packaged IC, or it can be composed of multiple packaged ICs with the same or different functions. For example, the processor 401 can include only a central processing unit (CPU). In the embodiment of the present application, the CPU can be a single computing core or multiple computing cores.

[0178] Memory 402 is used to store execution instructions of processor 401. Memory 402 can be implemented by any type of volatile or non-volatile storage device or a combination of them, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0179] When the execution instructions in the memory 402 are executed by the processor 401 , the electronic device 400 is enabled to execute part or all of the steps in the above method embodiment.

[0180] Corresponding to the above embodiment, the embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium may store a program, wherein when the program is running, the device where the computer-readable storage medium is located may be controlled to perform some or all of the steps in the above method embodiment. In a specific implementation, the computer-readable storage medium may be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM).

[0181] Corresponding to the above-mentioned embodiment, the embodiment of the present application further provides a computer program product, which includes executable instructions. When the executable instructions are executed on a computer, the computer executes some or all of the steps in the above-mentioned method embodiment.

[0182] In the embodiments of the present application, "at least one" refers to one or more, and "plurality" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0183] Those of ordinary skill in the art will appreciate that the various units and algorithm steps described in the embodiments disclosed herein can be implemented in a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0184] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0185] In several embodiments provided in the present application, any function can be stored in a computer-readable storage medium if it is implemented in the form of a software functional unit and sold or used as an independent product. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., and other media that can store program codes.

[0186] The above is only a specific implementation of the present application. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for geological evaluation of oil and gas blocks, characterized in that: include: Establish an evaluation system for oil and gas geological units; According to the oil and gas geological unit evaluation system, corresponding evaluation standards are formulated for each basin and field, and typical evaluation comparison areas are established; Divide the target area into one or more geological evaluation units; The evaluation indicators corresponding to each geological evaluation unit are assigned values ​​by combining quantitative model estimation, typical evaluation comparison area analogy and expert assignment; Determine the oil and gas condition probability index and resource strategic value index of each geological evaluation unit according to the assignment results of various evaluation indicators corresponding to each geological evaluation unit; Determining the classification level of the target block according to the oil and gas condition probability index and resource strategic value index of each geological evaluation unit in the target block; According to the oil and gas condition probability index and resource strategic value index of each geological evaluation unit in the target block, the comprehensive ranking index of the target block is determined, and the ranking of the target block among multiple blocks is determined according to the comprehensive ranking index.

2. The method according to claim 1, characterized in that The oil and gas geological unit evaluation system includes evaluation indicators corresponding to oil and gas conditional probability, resource strategic value and reliability, and evaluation parameters corresponding to each of the evaluation indicators.

3. The method according to claim 1, characterized in that Corresponding evaluation standards are formulated for each basin and field, and typical evaluation comparison areas are established, including: According to the geotectonic unit-basin division, the target area is divided into a primary structural area and a secondary structural area, wherein each of the primary structural areas includes a plurality of the secondary structural areas, and the same secondary structural areas have similar geological evolution characteristics; Establish evaluation standards for marine carbonate rocks, continental conventional clastic rocks, and continental tight oil and gas fields according to the secondary structural zones; Select areas with a high degree of geological understanding, and establish typical evaluation and comparison areas in secondary structural zones and fields.

4. The method according to claim 1, characterized in that The step of dividing the target area into one or more geological evaluation units includes: Based on basins, the reservoir assemblages are divided according to the characteristics of oil and gas accumulation; According to the reservoir combination, the target block is divided into one or more geological evaluation units.

5. The method according to claim 1, characterized in that The method of combining quantitative model estimation, typical evaluation comparison area analogy and expert assignment is used to assign values ​​to the evaluation indicators corresponding to each geological evaluation unit, including: According to the evaluation parameters of each geological evaluation unit and the quantitative model, the probability of existence of source conditions, reservoir conditions, preservation conditions, trap conditions and matching conditions of each geological evaluation unit is estimated; Assigning values ​​to the resource potential and engineering adaptability of each geological evaluation unit using a petroleum geological evaluation index assignment method; By using the evaluation criteria corresponding to the target block and combining with typical evaluation comparison areas, the probability of existence of source conditions, reservoir conditions, preservation conditions, trap conditions, matching conditions, resource potential and engineering adaptability of each geological evaluation unit are adjusted through expert assignment.

6. The method according to claim 5, characterized in that The method of estimating the existence probability of source conditions, reservoir conditions, preservation conditions, trap conditions and matching conditions of each geological evaluation unit according to the evaluation parameters of each geological evaluation unit and the quantitative model includes: According to the hydrocarbon source quality, hydrocarbon source scale and hydrocarbon source evolution degree of each geological evaluation unit, the probability of existence of hydrocarbon source conditions in each geological evaluation unit is estimated; According to the reservoir properties and reservoir scale of each geological evaluation unit, the probability of existence of the reservoir condition of each geological evaluation unit is estimated; According to the regional cap rock lithology, regional cap rock thickness and the degree of later damage of each geological evaluation unit, the probability of existence of the preservation condition of each geological evaluation unit is estimated; According to the trap development degree and trap implementation degree of each geological evaluation unit, the probability of existence of the trap condition of each geological evaluation unit is estimated; According to the spatial matching, temporal matching and transport system of each geological evaluation unit, the existence probability of the matching condition of each geological evaluation unit is estimated.

7. The method according to claim 1, characterized in that The calculation formula of the oil and gas condition probability index is: PI 油气 =(P 烃源 ·P 储层 ·P 圈闭 ·P 保存 ·P 匹配 ) 2 / 5 Among them, PI 油气 is the oil and gas conditional probability index, P 烃源 is the probability of existence of hydrocarbon source conditions, P 储层 is the probability of reservoir condition existence, P 保存 is the probability of existence of the preservation condition, P 圈闭 is the probability of existence of the trap condition, P 匹配 is the probability of matching condition.

8. The method according to claim 1, characterized in that: Determining the classification level of the target block according to the oil and gas condition probability index and resource strategic value index of each geological evaluation unit in the target block includes: Determine the classification level of each geological evaluation unit according to the oil and gas condition probability index and resource strategic value index of each geological evaluation unit, and the oil and gas condition probability index and resource strategic value index evaluation template; The classification level of the target block is determined according to the classification level of each of the geological evaluation units in the target block.

9. The method according to claim 8, characterized in that Determining the classification level of the target block according to the classification level of each of the geological evaluation units in the target block includes: The classification level corresponding to the geological evaluation unit with the highest classification level in the target block is used as the classification level of the target block.

10. The method according to claim 1, characterized in that The calculation formula of the comprehensive ranking index is: Among them, Q is the comprehensive ranking index, S is the target block area, S i is the overlapping area between the i-th geological evaluation unit and the target block, PI i is the oil and gas condition probability index of the i-th geological evaluation unit, QI i is the resource strategic value index of the ith geological evaluation unit, and n is the number of geological evaluation units.

11. The method according to claim 1, characterized in that: The method further comprises: The reliability of each geological evaluation unit in the target block is estimated according to the data reliability and knowledge level of each geological evaluation unit in the target block.

12. A geological evaluation device for oil and gas blocks, characterized in that: include: The oil and gas geological unit evaluation system establishment module is used to establish the oil and gas geological unit evaluation system; The typical evaluation comparison area module is used to formulate corresponding evaluation standards by basin and field according to the oil and gas geological unit evaluation system, and establish typical evaluation comparison areas; A geological evaluation unit division module is used to divide the target block into one or more geological evaluation units; An evaluation index assignment module is used to assign values ​​to various evaluation indicators corresponding to each geological evaluation unit by combining quantitative model estimation, typical evaluation comparison area analogy and expert assignment; An oil and gas condition probability index and resource strategic value index determination module, used to determine the oil and gas condition probability index and resource strategic value index of each geological evaluation unit according to the assignment results of various evaluation indicators corresponding to each geological evaluation unit; A classification level determination module, used to determine the classification level of the target block according to the oil and gas condition probability index and resource strategic value index of each geological evaluation unit in the target block; A ranking determination module is used to determine the comprehensive ranking index of the target block according to the oil and gas condition probability index and the resource strategic value index of each geological evaluation unit in the target block, and determine the ranking of the target block among multiple blocks according to the comprehensive ranking index.

13. An electronic device, characterized in that: include: processor; Memory; And a computer program, wherein the computer program is stored in the memory, and the computer program includes instructions, and when the instructions are executed by the processor, the electronic device executes the method according to any one of claims 1 to 11.

14. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the method according to any one of claims 1 to 11.

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