Method and device for determining the oil and gas transport capacity of strike-slip faults in the reservoir formation period by segment

Abstract

The embodiment of the present application provides a method and device for determining the oil and gas transport capacity of a strike-slip fault during the accumulation period in sections, the method comprising: dividing the strike-slip fault into multiple sections according to characteristic information of the strike-slip fault in a seismic profile; determining the oil and gas transport capacity of each strike-slip fault during the accumulation period according to the angle between the principal stress direction and the fault strike of each strike-slip fault during the accumulation period, the average density of sedimentary rocks, the density of formation water, the fault dip, the burial depth of the fault point during the accumulation period, and the mud content of the fault rock; determining the strike-slip fault that can transport oil and gas during the accumulation period according to the oil and gas transport capacity of each strike-slip fault during the accumulation period and a preset oil and gas transport capacity screening rule; the present application can accurately calculate the oil and gas transport capacity of different fault positions during the accumulation period in areas where strike-slip faults are developed, thereby improving the success rate of drilling and saving exploration costs.

Description

Technical Field

[0001] The present application relates to the field of oil and gas exploration, and in particular to a method and device for determining the oil and gas transport capacity of a strike-slip fault during the reservoir formation period in sections. Background Art

[0002] With the deepening of oil and gas exploration, people pay more and more attention to the role of faults in oil and gas accumulation and distribution, and the research is becoming more and more in-depth. Faults can not only block oil and gas, but more importantly, they can serve as channels for oil and gas migration. Especially for distant oil and gas accumulation, the research on the transport capacity of faults is particularly important. Previous researchers have done a lot of research on the mechanism, form, type and control factors of fault transport of oil and gas. The evaluation of the ability of faults to transport oil and gas has also been studied and discussed to a certain extent, mainly from the development characteristics of the fault itself (such as length, inclination, density) and the degree of opening of the fault zone or the composition of the filling material to study the ability of faults to transport oil and gas. In 2017, Wang Xuefeng started from the mechanism of fault transport of oil and gas, considered various major influencing factors to study the ability of faults to transport oil and gas, established a set of comprehensive evaluation methods for the ability of faults to transport oil and gas, and applied this method to the evaluation of the ability of faults to transport oil and gas in the Nanpu I structural belt of the Nanpu Sag, and achieved good application results. However, this method does not take into account the segmentation of faults, especially for strike-slip faults with longer extensions. It cannot use a single value to reflect the fault's ability to transport oil and gas. Different segments of a strike-slip fault have different oil and gas transport capacities. On the other hand, this method does not take into account the fault's ability to transport oil and gas during the accumulation period. The current fault's ability to transport oil and gas cannot represent the fault's ability to transport oil and gas during the accumulation period. Summary of the invention

[0003] In response to the problems in the prior art, the present application provides a method and device for segmented determination of the oil and gas transport capacity of a strike-slip fault during the reservoir-forming period, which can accurately calculate the oil and gas transport capacity of different fault positions during the reservoir-forming period in areas where strike-slip faults are developed, thereby improving the success rate of drilling and saving exploration costs.

[0004] In order to solve at least one of the above problems, the present application provides the following technical solutions:

[0005] In a first aspect, the present application provides a method for determining the oil and gas transport capacity of a strike-slip fault in the reservoir formation period in sections, comprising:

[0006] According to characteristic information of the strike-slip fault in the seismic section, the strike-slip fault is divided into multiple sections;

[0007] Determine the oil and gas transport capacity of each strike-slip fault during the reservoir formation period according to the angle between the regional principal stress direction and the fault strike during the reservoir formation period, the average density of sedimentary rocks, the formation water density, the fault dip, the burial depth of the fault point during the reservoir formation period, and the shale content of the fault rock;

[0008] According to the oil and gas transporting capacity of each strike-slip fault during the reservoir-forming period and the preset oil and gas transporting capacity screening rules, the strike-slip faults that can transport oil and gas during the reservoir-forming period are determined.

[0009] Furthermore, before determining the oil and gas transport capacity of each strike-slip fault during the reservoir formation period according to the angle between the regional principal stress direction and the fault strike during the reservoir formation period, the average density of sedimentary rocks, the formation water density, the fault dip, the burial depth of the fault point during the reservoir formation period, and the shale content of the fault rock, the method includes:

[0010] The shale content of the fault rock is determined based on the thickness of the faulted strata, the shale content of the faulted strata, the fault distance and the number of faulted strata.

[0011] Furthermore, the determination of the strike-slip faults capable of transporting oil and gas during the reservoir formation period according to the oil and gas transport capacity of each strike-slip fault during the reservoir formation period and the preset oil and gas transport capacity screening rules includes:

[0012] It is determined whether the oil and gas transport capacity of each strike-slip fault during the accumulation period is greater than a preset oil and gas transport capacity threshold. If so, it is determined that the strike-slip fault has the ability to transport oil and gas during the accumulation period. Otherwise, it is determined that the strike-slip fault does not have the ability to transport oil and gas during the accumulation period.

[0013] Furthermore, the strike-slip fault is divided into multiple sections according to the characteristic information of the strike-slip fault in the seismic section, including:

[0014] According to the fault throw, flower-shaped structure and thickness change of the upper and lower plates of the strike-slip fault in the seismic section, the strike-slip fault is divided into multiple sections according to the set length.

[0015] In a second aspect, the present application provides a device for determining the oil and gas transport capacity of a strike-slip fault in the reservoir formation period in sections, comprising:

[0016] A strike-slip fault segmentation module, used to divide the strike-slip fault into multiple segments according to characteristic information of the strike-slip fault in the seismic profile;

[0017] A module for determining oil and gas transport capacity, for determining the oil and gas transport capacity of each strike-slip fault during the reservoir formation period according to the angle between the principal stress direction of the region during the reservoir formation period and the fault strike, the average density of sedimentary rocks, the formation water density, the fault dip, the burial depth of the fault point during the reservoir formation period, and the shale content of the fault rock;

[0018] The strike-slip fault screening module is used to determine the strike-slip faults that can transport oil and gas during the reservoir formation period according to the fault transport capacity of each strike-slip fault during the reservoir formation period and the preset oil and gas transport capacity screening rules.

[0019] Furthermore, it also includes:

[0020] The fault rock shale content determination unit is used to determine the fault rock shale content according to the thickness of the faulted strata, the shale content of the faulted strata, the fault distance and the number of faulted strata.

[0021] Furthermore, the strike-slip fault screening module includes:

[0022] The threshold judgment unit is used to judge whether the oil and gas transport capacity of each strike-slip fault during the accumulation period is greater than a preset oil and gas transport capacity threshold. If so, it is judged that the strike-slip fault has the ability to transport oil and gas during the accumulation period. Otherwise, it is judged that the strike-slip fault does not have the ability to transport oil and gas during the accumulation period.

[0023] Furthermore, the strike-slip fault segmentation module includes:

[0024] The seismic profile feature division unit is used to divide the strike-slip fault into multiple sections according to the set length according to the fault distance, flower-shaped structure and thickness change of the upper and lower plates of the strike-slip fault in the seismic profile.

[0025] In a third aspect, the present application provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the method for determining the oil and gas transport capacity of a strike-slip fault during the reservoir formation period are implemented.

[0026] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method for determining the oil and gas transport capacity of a strike-slip fault during the reservoir formation period in a segmented manner.

[0027] It can be seen from the above technical scheme that the present application provides a method and device for determining the oil and gas transporting capacity of a strike-slip fault during the reservoir formation period in sections, by dividing the strike-slip fault into multiple sections according to the characteristic information of the strike-slip fault in the seismic profile; determining the oil and gas transporting capacity of each strike-slip fault during the reservoir formation period according to the angle between the principal stress direction of the reservoir formation period area and the fault strike, the average density of the sedimentary rock, the formation water density, the fault dip, the buried depth of the fault point during the reservoir formation period, and the mud content of the fault rock; determining the strike-slip fault that can transport oil and gas during the reservoir formation period according to the oil and gas transporting capacity of each strike-slip fault during the reservoir formation period and the preset oil and gas transporting capacity screening rules. The present application can accurately calculate the oil and gas transporting capacity of different fault positions during the reservoir formation period in areas where strike-slip faults are developed, thereby improving the success rate of drilling and saving exploration costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is a flow chart of a method for determining the oil and gas transport capacity of a strike-slip fault in the reservoir-forming period in sections in an embodiment of the present application;

[0030] Figure 2 This is one of the structural diagrams of the device for determining the oil and gas transport capacity of a strike-slip fault in the reservoir formation period in the embodiment of the present application in sections;

[0031] Figure 3 This is the second structural diagram of the device for determining the oil and gas transport capacity of a strike-slip fault in the reservoir-forming period in the embodiment of the present application in sections;

[0032] Figure 4 The third structural diagram of the device for determining the oil and gas transport capacity of a strike-slip fault during the reservoir formation period in the embodiment of the present application;

[0033] Figure 5 It is a schematic diagram of the structure of an electronic device in an embodiment of the present application. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] Considering that the existing methods do not take into account the segmentation of faults, especially for strike-slip faults with longer extensions, one value cannot be used to reflect the fault's ability to transport oil and gas, and different segments of a strike-slip fault have different oil and gas transport capacities; on the other hand, the method does not take into account the fault's ability to transport oil and gas during the accumulation period, and the current fault's ability to transport oil and gas cannot represent the problem of the fault's ability to transport oil and gas during the accumulation period. The present application provides a method and device for determining the segmentation of the strike-slip fault's ability to transport oil and gas during the accumulation period, by dividing the strike-slip fault into multiple segments according to characteristic information of the strike-slip fault in a seismic profile; determining the fault's ability to transport oil and gas during the accumulation period according to the angle between the direction of the principal stress in the accumulation period region and the fault strike, the average density of sedimentary rocks, the formation water density, the fault dip, the burial depth of the fault point during the accumulation period, and the mud content of the fault rock; determining the strike-slip fault that can transport oil and gas during the accumulation period according to the fault's ability to transport oil and gas during the accumulation period and the preset oil and gas transport capacity screening rules. The present application can accurately calculate the oil and gas transport capacity of different fault positions during the reservoir formation period in areas where strike-slip faults are developed, thereby improving the success rate of drilling and saving exploration costs.

[0036] In order to accurately calculate the oil and gas transport capacity of different fault positions during the reservoir formation period in areas where strike-slip faults are developed, improve the success rate of drilling, and save exploration costs, the present application provides an embodiment of a method for determining the oil and gas transport capacity of strike-slip faults during the reservoir formation period in sections, see Figure 1 The method for determining the oil and gas transport capacity of the strike-slip fault in the reservoir formation period by segment specifically includes the following contents:

[0037] Step S101: Divide the strike-slip fault into multiple sections according to characteristic information of the strike-slip fault in the seismic profile.

[0038] Alternatively, strike-slip faults are developed in the basins of western China. Strike-slip faults generally have steep sections, flower-shaped structures, large variations in fault throw, common dolphin effects in space, and long fault extensions. Strike-slip faults have great differences in geometry, kinematics, and activity at different locations, which makes the faults obviously segmented in the plane, resulting in different effects of strike-slip faults on oil and gas migration and accumulation at different locations. For this reason, strike-slip faults are divided into different segments according to their characteristics in seismic sections, including fault throw, flower-shaped structures, and thickness changes of upper and lower wall strata.

[0039] For example, for research purposes, the strike-slip fault under study was divided into 20 sections, each 2.1 km long.

[0040] Step S102: Determine the oil and gas transport capacity of each strike-slip fault during the reservoir formation period according to the angle between the principal stress direction in the reservoir formation period area and the fault strike, the average density of sedimentary rocks, the formation water density, the fault dip, the burial depth of the fault point during the reservoir formation period, and the mud content of the fault rock.

[0041] Optionally, the strength of the fault's oil and gas transport capacity is mainly affected by the relative size of its oil and gas transport power and resistance. The size of the fault's oil and gas transport power is mainly affected by the difference in buoyancy caused by different cross-section inclinations. Therefore, the relative size of the sine value of the fault inclination can be used to express the relative size of its buoyancy. The larger the value, the stronger the fault's oil and gas transport power; vice versa. The size of the fault's transport resistance is affected by the mud content of the fault zone and the degree of fracture opening. The greater the mud content of the fault zone, the greater the transport resistance; vice versa. The higher the degree of fracture opening, the smaller the fault's oil and gas transport resistance; vice versa. Based on the above-mentioned influencing factors and their relationship with the fault's oil and gas transport capacity, a comprehensive evaluation index for the fault's oil and gas transport capacity was established:

[0042]

[0043] In formula (1), T 成藏期 ——Comprehensive evaluation index of fault transport capacity for oil and gas during the accumulation period;

[0044] β is the angle between the principal stress direction in the reservoir-forming period and the fault strike, (°);

[0045] ρ r ——Average density of sedimentary rocks, g / cm 3 ;

[0046] ρ w ——formation water density, g / cm 3 ;

[0047] θ——fault dip, (°);

[0048] Z 成藏期 ——Breakpoint burial depth during reservoir formation period, m;

[0049] SGR——Shali content of fault rock, %.

[0050] The β value can be used to project the regional principal stress direction of the study area during the period of oil and gas accumulation onto the structural map of the target layer, and is determined by measuring the angle between the direction of the studied fault and the regional principal compressive stress direction; ρ r , w The value of θ can be obtained by directly measuring or indirectly calculating from the structural map combined with the seismic profile through the drilling data in the study area. 成藏期 It can be determined by drilling data or seismic data, but it is necessary to restore the target layer fault point burial depth to the reservoir formation period. The SGR value can be calculated by the fault throw and the thickness and shale content of the faulted stratum using the following formula (2):

[0051]

[0052] In formula (2), Hi ——Thickness of the i-th stratum dislocated by the fault, m;

[0053] R i ——the mud content of the i-th layer of the fault, %;

[0054] L——fracture distance, m;

[0055] n——the number of strata interrupted by the fault.

[0056] By obtaining the above parameters in the study area, the comprehensive evaluation index of the oil and gas transport capacity of each segment of the fault can be calculated.

[0057] Step S103: Determine the strike-slip faults that can transport oil and gas during the reservoir-forming period according to the fault oil and gas transport capacity of each strike-slip fault during the reservoir-forming period and the preset oil and gas transport capacity screening rules.

[0058] Optionally, the above calculation formula (1) can be used to obtain a comprehensive evaluation index of the oil and gas transport capacity of each section of the strike-slip fault during the accumulation period. The larger the value, the stronger the oil and gas transport capacity of the fault, and vice versa.

[0059] It is understandable that due to different geological conditions and different parameters in different regions, the values ​​of the fault's ability to transport oil and gas obtained by the formula are also different. Therefore, T calculated by formula (1) is a relative value. How to measure whether different sections of a fault can transport oil and gas requires a threshold value based on the drilling conditions in the study area. When T ≥ the threshold value, the fault has the ability to transport oil and gas. When T < the threshold value, the fault cannot transport oil and gas. This method can be used to determine whether different sections of this strike-slip fault can transport oil and gas during the accumulation period.

[0060] From the above description, it can be seen that the segmented determination method of the oil and gas transport capacity of a strike-slip fault during the accumulation period provided by the embodiment of the present application can divide the strike-slip fault into multiple segments according to the characteristic information of the strike-slip fault in the seismic profile; determine the oil and gas transport capacity of each strike-slip fault during the accumulation period according to the angle between the principal stress direction of the area during the accumulation period and the fault strike, the average density of the sedimentary rock, the formation water density, the fault dip, the buried depth of the fault point during the accumulation period, and the mud content of the fault rock; determine the strike-slip fault that can transport oil and gas during the accumulation period according to the oil and gas transport capacity of each strike-slip fault during the accumulation period and the preset oil and gas transport capacity screening rules. The present application can accurately calculate the oil and gas transport capacity of different positions of the fault during the accumulation period in areas where strike-slip faults are developed, improve the success rate of drilling, and save exploration costs.

[0061] In order to use accurate fault rock shale content when calculating the oil and gas transport capacity of each strike-slip fault during the reservoir formation period, in one embodiment of the method for determining the oil and gas transport capacity of a strike-slip fault during the reservoir formation period of the present application, before the above S102, the following contents may be specifically included:

[0062] The shale content of the fault rock is determined based on the thickness of the faulted strata, the shale content of the faulted strata, the fault distance and the number of faulted strata.

[0063] The SGR value can be calculated from the fault throw and the thickness and shale content of the faulted strata using the following formula (2):

[0064]

[0065] In formula (2), H i ——Thickness of the i-th stratum dislocated by the fault, m;

[0066] R i ——the mud content of the i-th layer of the fault, %;

[0067] L——fracture distance, m;

[0068] n——the number of strata interrupted by the fault.

[0069] By obtaining the above parameters in the study area, the comprehensive evaluation index of the oil and gas transport capacity of each segment of the fault can be calculated.

[0070] In order to accurately select a certain section of strike-slip faults that have the ability to transport oil and gas during the accumulation period, in one embodiment of the method for determining the oil and gas transport capacity of strike-slip faults during the accumulation period of the present application, the above S103 may also specifically include the following contents:

[0071] It is determined whether the oil and gas transport capacity of each strike-slip fault during the accumulation period is greater than a preset oil and gas transport capacity threshold. If so, it is determined that the strike-slip fault has the ability to transport oil and gas during the accumulation period. Otherwise, it is determined that the strike-slip fault does not have the ability to transport oil and gas during the accumulation period.

[0072] It is understandable that due to different geological conditions and different parameters in different regions, the values ​​of the fault's ability to transport oil and gas obtained by the formula are also different. Therefore, T calculated by formula (1) is a relative value. How to measure whether different sections of a fault can transport oil and gas requires a threshold value based on the drilling conditions in the study area. When T ≥ the threshold value, the fault has the ability to transport oil and gas. When T < the threshold value, the fault cannot transport oil and gas. This method can be used to determine whether different sections of this strike-slip fault can transport oil and gas during the accumulation period.

[0073] In order to accurately segment the strike-slip fault, in one embodiment of the method for segmenting the oil and gas transport capacity of the strike-slip fault during the reservoir formation period of the present application, the above S101 may also specifically include the following contents:

[0074] According to the fault throw, flower-shaped structure and thickness change of the upper and lower plates of the strike-slip fault in the seismic section, the strike-slip fault is divided into multiple sections according to the set length.

[0075] Alternatively, strike-slip faults are developed in the basins of western China. Strike-slip faults generally have steep sections, flower-shaped structures, large variations in fault throw, common dolphin effects in space, and long fault extensions. Strike-slip faults have great differences in geometry, kinematics, and activity at different locations, which makes the faults obviously segmented in the plane, resulting in different effects of strike-slip faults on oil and gas migration and accumulation at different locations. For this reason, strike-slip faults are divided into different segments according to their characteristics in seismic sections, including fault throw, flower-shaped structures, and thickness changes of upper and lower wall strata.

[0076] In order to accurately calculate the oil and gas transport capacity of different fault positions during the reservoir formation period in areas where strike-slip faults are developed, improve the success rate of drilling, and save exploration costs, the present application provides an embodiment of a device for determining the oil and gas transport capacity of a strike-slip fault during the reservoir formation period in sections for realizing all or part of the content of the method for determining the oil and gas transport capacity of a strike-slip fault during the reservoir formation period, see Figure 2 The device for determining the oil and gas transport capacity of a strike-slip fault in the reservoir formation period in sections specifically includes the following contents:

[0077] The strike-slip fault segmentation module 10 is used to divide the strike-slip fault into multiple segments according to characteristic information of the strike-slip fault in the seismic section.

[0078] The oil and gas transport capacity determination module 20 is used to determine the oil and gas transport capacity of each strike-slip fault during the accumulation period according to the angle between the principal stress direction in the accumulation period area and the fault strike, the average density of sedimentary rocks, the formation water density, the fault dip, the burial depth of the fault point during the accumulation period, and the mud content of the fault rock.

[0079] The strike-slip fault screening module 30 is used to determine the strike-slip faults that can transport oil and gas during the reservoir formation period according to the fault transport capacity of oil and gas during the reservoir formation period of each strike-slip fault and the preset oil and gas transport capacity screening rules.

[0080] From the above description, it can be known that the segmented determination device of the oil and gas transporting capacity of a strike-slip fault during the accumulation period provided by the embodiment of the present application can divide the strike-slip fault into multiple segments according to the characteristic information of the strike-slip fault in the seismic profile; determine the oil and gas transporting capacity of each strike-slip fault during the accumulation period according to the angle between the principal stress direction of the area during the accumulation period and the fault strike, the average density of the sedimentary rock, the formation water density, the fault dip, the buried depth of the fault point during the accumulation period, and the mud content of the fault rock; determine the strike-slip fault that can transport oil and gas during the accumulation period according to the oil and gas transporting capacity of each strike-slip fault during the accumulation period and the preset oil and gas transporting capacity screening rules. The present application can accurately calculate the oil and gas transporting capacity of different positions of the fault during the accumulation period in areas where strike-slip faults are developed, improve the success rate of drilling, and save exploration costs.

[0081] In order to use accurate fault rock shale content when calculating the oil and gas transport capacity of each strike-slip fault during the reservoir formation period, in one embodiment of the device for determining the oil and gas transport capacity of strike-slip faults during the reservoir formation period of the present application, the following contents are specifically included:

[0082] The fault rock shale content determination unit is used to determine the fault rock shale content according to the thickness of the faulted strata, the shale content of the faulted strata, the fault distance and the number of faulted strata.

[0083] In order to accurately select a certain section of the strike-slip fault that has the ability to transport oil and gas during the accumulation period, in one embodiment of the device for determining the oil and gas transport capacity of the strike-slip fault during the accumulation period of the present application, see Figure 3 , the strike-slip fault screening module 30 comprises:

[0084] The threshold judgment unit 31 is used to judge whether the oil and gas transport capacity of each strike-slip fault during the reservoir formation period is greater than a preset oil and gas transport capacity threshold. If so, it is judged that the strike-slip fault has the ability to transport oil and gas during the reservoir formation period. Otherwise, it is judged that the strike-slip fault does not have the ability to transport oil and gas during the reservoir formation period.

[0085] In order to accurately segment the strike-slip fault, in one embodiment of the device for determining the oil and gas transport capacity of the strike-slip fault during the reservoir formation period of the present application, see Figure 4 , the strike-slip fault segmentation module 10 comprises:

[0086] The seismic profile feature division unit 11 is used to divide the strike-slip fault into multiple sections according to a set length according to the fault throw, flower-shaped structure and thickness change of the upper and lower plates of the strike-slip fault in the seismic profile.

[0087] In order to further illustrate the present solution, the present application also provides a specific application example of the method for determining the oil and gas transport capacity of a strike-slip fault in the reservoir formation period by segmentation using the above-mentioned device for determining the oil and gas transport capacity of a strike-slip fault in the reservoir formation period, which specifically includes the following contents:

[0088] (1) Segmentation of strike-slip faults. The specific approach is: according to the characteristics of strike-slip faults on seismic profiles, the strike-slip faults are divided into several segments. The specific number of segments should be analyzed according to the actual situation of the region. In the case of small changes in fault throw and simple tectonic activities, fewer segments can be divided. For large changes in faults and complex tectonic activities, several segments can be divided. The strike-slip fault No. 1 in the study area extends 42 km. According to the research needs, it is divided into 20 segments, each 2.1 km long. These 20 segments can reflect the segmentation characteristics of the strike-slip fault No. 1.

[0089] (2) Calculate the comprehensive evaluation index of the oil and gas transport capacity of different sections of the strike-slip fault during the accumulation period. The specific method is: first, according to the known strata encountered by the well and the seismic profiles across the fault, calculate Hi (the thickness of the i-th stratum interrupted by the fault), Ri (the mud content of the i-th stratum interrupted by the fault), L (fault distance), and n (the number of strata interrupted by the fault). Substituting the above four parameters into formula (2), the SGR value can be obtained.

[0090] Then, β (the angle between the regional principal stress direction and the fault strike during the hydrocarbon accumulation period), θ (fault dip), and Z accumulation period (burial depth of the fault point during the hydrocarbon accumulation period) are calculated. The β value can be determined by projecting the regional principal compressive stress direction of the study area during the hydrocarbon accumulation period onto the structural map of the target layer, and by measuring the angle between the fault strike under study and the regional principal compressive stress direction; the θ value can be directly measured or indirectly calculated from the structural map combined with the seismic profile; the Z accumulation period can be determined by drilling data or seismic data, but the calculation of the fault point burial depth of the target layer must be restored to the accumulation period.

[0091] Finally, the above-obtained parameters are substituted into formula (1) to calculate the comprehensive evaluation index of the oil and gas transport capacity of different fault segments.

[0092] (3) Based on known drilling information, the threshold is calculated to determine whether different sections of the strike-slip fault can transport oil and gas.

[0093] The comprehensive evaluation index of the fault's oil and gas transport capacity obtained by the above calculation formula is a relative value. How large this value is to transport oil and gas requires a threshold to be determined based on the wells drilled in the study area.

[0094] From the above content, it can be seen that the comprehensive evaluation index of the oil and gas transport capacity of different sections of the fault during the accumulation period is calculated by the above method. Combined with the threshold determined by drilling, it can be determined whether different sections of the fault can transport oil and gas during the accumulation period.

[0095] From the hardware level, in order to accurately calculate the oil and gas transport capacity of different fault positions during the reservoir formation period in areas where strike-slip faults are developed, improve the success rate of drilling, and save exploration costs, the present application provides an embodiment of an electronic device for implementing all or part of the content of the method for segmented determination of the oil and gas transport capacity of strike-slip faults during the reservoir formation period, and the electronic device specifically includes the following content:

[0096] Processor, memory, communication interface and bus; wherein the processor, memory and communication interface communicate with each other through the bus; the communication interface is used to realize information transmission between the device for determining the oil and gas transport capacity of a strike-slip fault in the reservoir formation period and related equipment such as the core business system, user terminal and related database; the logic controller can be a desktop computer, a tablet computer and a mobile terminal, etc., and the present embodiment is not limited thereto. In the present embodiment, the logic controller can be implemented with reference to the embodiment of the method for determining the oil and gas transport capacity of a strike-slip fault in the reservoir formation period and the embodiment of the device for determining the oil and gas transport capacity of a strike-slip fault in the reservoir formation period, and the contents thereof are incorporated herein, and the repeated parts are not repeated.

[0097] It is understandable that the user terminal may include a smart phone, a tablet electronic device, a network set-top box, a portable computer, a desktop computer, a personal digital assistant (PDA), a vehicle-mounted device, a smart wearable device, etc. Among them, the smart wearable device may include smart glasses, a smart watch, a smart bracelet, etc.

[0098] In practical applications, part of the method for determining the oil and gas transport capacity of a strike-slip fault during the reservoir formation period can be performed on the electronic device side as described above, or all operations can be completed in the client device. The selection can be made based on the processing capacity of the client device and the limitations of the user's usage scenario. This application does not limit this. If all operations are completed in the client device, the client device may also include a processor.

[0099] The client device may have a communication module (i.e., a communication unit) that can communicate with a remote server to achieve data transmission with the server. The server may include a server on the task scheduling center side, and other implementation scenarios may also include a server on an intermediate platform, such as a server on a third-party server platform that has a communication link with the task scheduling center server. The server may include a single computer device, or a server cluster consisting of multiple servers, or a server structure of a distributed device.

[0100] Figure 5FIG. 9 is a schematic block diagram of the system structure of the electronic device 9600 according to an embodiment of the present application. Figure 5 As shown, the electronic device 9600 may include a central processor 9100 and a memory 9140; the memory 9140 is coupled to the central processor 9100. It is worth noting that Figure 5 is exemplary; other types of structures may also be used to supplement or replace this structure to implement telecommunication functions or other functions.

[0101] In one embodiment, the function of the method for determining the oil and gas transport capacity of a strike-slip fault in the reservoir formation period in sections can be integrated into the central processor 9100. The central processor 9100 can be configured to perform the following control:

[0102] Step S101: Divide the strike-slip fault into multiple sections according to characteristic information of the strike-slip fault in the seismic profile.

[0103] Step S102: Determine the oil and gas transport capacity of each strike-slip fault during the reservoir formation period according to the angle between the principal stress direction in the reservoir formation period area and the fault strike, the average density of sedimentary rocks, the formation water density, the fault dip, the burial depth of the fault point during the reservoir formation period, and the mud content of the fault rock.

[0104] Step S103: Determine the strike-slip faults that can transport oil and gas during the reservoir-forming period according to the fault oil and gas transport capacity of each strike-slip fault during the reservoir-forming period and the preset oil and gas transport capacity screening rules.

[0105] As can be seen from the above description, the electronic device provided by the embodiment of the present application divides the strike-slip fault into multiple sections according to the characteristic information of the strike-slip fault in the seismic profile; determines the oil and gas transport capacity of each strike-slip fault during the accumulation period according to the angle between the main stress direction and the fault strike in the accumulation period of each strike-slip fault, the average density of sedimentary rocks, the density of formation water, the fault dip, the buried depth of the fault point during the accumulation period, and the shale content of the fault rock; determines the strike-slip fault that can transport oil and gas during the accumulation period according to the oil and gas transport capacity of each strike-slip fault during the accumulation period and the preset oil and gas transport capacity screening rules. ; The present application can accurately calculate the oil and gas transport capacity of different fault positions during the accumulation period in areas where strike-slip faults are developed, improve the success rate of drilling, and save exploration costs.

[0106] In another embodiment, the device for determining the segmented oil and gas transporting capacity of a strike-slip fault during the reservoir-forming period may be configured separately from the central processor 9100. For example, the device for determining the segmented oil and gas transporting capacity of a strike-slip fault during the reservoir-forming period may be configured as a chip connected to the central processor 9100, and the function of the method for determining the segmented oil and gas transporting capacity of a strike-slip fault during the reservoir-forming period may be implemented through the control of the central processor.

[0107] like Figure 5As shown, the electronic device 9600 may also include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is worth noting that the electronic device 9600 does not necessarily have to include Figure 5 In addition, the electronic device 9600 may also include Figure 5 For components not shown, reference may be made to the prior art.

[0108] like Figure 5 As shown, the central processing unit 9100 is sometimes also referred to as a controller or an operation control, and may include a microprocessor or other processor device and / or logic device. The central processing unit 9100 receives input and controls the operation of various components of the electronic device 9600.

[0109] The memory 9140 may be, for example, one or more of a cache, a flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory or other suitable devices. The above-mentioned information related to the failure may be stored, and a program for executing the relevant information may also be stored. The CPU 9100 may execute the program stored in the memory 9140 to implement information storage or processing, etc.

[0110] The input unit 9120 provides input to the central processing unit 9100. The input unit 9120 is, for example, a key or a touch input device. The power supply 9170 is used to provide power to the electronic device 9600. The display 9160 is used to display display objects such as images and texts. The display may be, for example, an LCD display, but is not limited thereto.

[0111] The memory 9140 may be a solid-state memory, such as a read-only memory (ROM), a random access memory (RAM), a SIM card, etc. It may also be a memory that saves information even when the power is off, can be selectively erased, and is provided with more data, examples of which are sometimes referred to as EPROMs, etc. The memory 9140 may also be some other type of device. The memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 may include an application / function storage unit 9142, which is used to store application programs and function programs or processes for executing the operation of the electronic device 9600 through the central processor 9100.

[0112] The memory 9140 may also include a data storage unit 9143 for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit 9144 of the memory 9140 may include various drivers for communication functions of the electronic device and / or for executing other functions of the electronic device (such as messaging applications, address book applications, etc.).

[0113] The communication module 9110 is a transmitter / receiver 9110 that sends and receives signals via an antenna 9111. The communication module (transmitter / receiver) 9110 is coupled to the central processor 9100 to provide input signals and receive output signals, which may be the same as the case of a conventional mobile communication terminal.

[0114] Based on different communication technologies, multiple communication modules 9110 may be provided in the same electronic device, such as a cellular network module, a Bluetooth module and / or a wireless LAN module, etc. The communication module (transmitter / receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide an audio output via the speaker 9131 and receive an audio input from the microphone 9132, thereby realizing a common telecommunication function. The audio processor 9130 may include any suitable buffer, decoder, amplifier, etc. In addition, the audio processor 9130 is also coupled to the central processor 9100, so that recording can be performed on the local machine through the microphone 9132, and the sound stored on the local machine can be played through the speaker 9131.

[0115] The embodiment of the present application also provides a computer-readable storage medium capable of implementing all the steps in the method for determining the oil and gas transport capacity of a strike-slip fault in the reservoir formation period in the above embodiment, where the execution subject is a server or a client. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, all the steps in the method for determining the oil and gas transport capacity of a strike-slip fault in the reservoir formation period in the above embodiment are implemented. For example, when the processor executes the computer program, the following steps are implemented:

[0116] Step S101: Divide the strike-slip fault into multiple sections according to characteristic information of the strike-slip fault in the seismic profile.

[0117] Step S102: Determine the oil and gas transport capacity of each strike-slip fault during the reservoir formation period according to the angle between the principal stress direction in the reservoir formation period area and the fault strike, the average density of sedimentary rocks, the formation water density, the fault dip, the burial depth of the fault point during the reservoir formation period, and the mud content of the fault rock.

[0118] Step S103: Determine the strike-slip faults that can transport oil and gas during the reservoir-forming period according to the fault oil and gas transport capacity of each strike-slip fault during the reservoir-forming period and the preset oil and gas transport capacity screening rules.

[0119] From the above description, it can be seen that the computer-readable storage medium provided in the embodiment of the present application divides the strike-slip fault into multiple sections according to the characteristic information of the strike-slip fault in the seismic profile; determines the oil and gas transport capacity of each strike-slip fault during the accumulation period according to the angle between the principal stress direction of the area during the accumulation period and the fault strike, the average density of the sedimentary rock, the formation water density, the fault dip, the burial depth of the fault point during the accumulation period, and the mud content of the fault rock; determines the strike-slip fault that can transport oil and gas during the accumulation period according to the oil and gas transport capacity of each strike-slip fault during the accumulation period and the preset oil and gas transport capacity screening rules. The present application can accurately calculate the oil and gas transport capacity of different fault positions during the accumulation period in areas where strike-slip faults are developed, improve the success rate of drilling, and save exploration costs.

[0120] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, devices, 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.

[0121] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (apparatus), 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 generate 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.

[0122] 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.

[0123] 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 in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0124] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for determining the oil and gas transport capacity of a strike-slip fault in the reservoir formation period by segmentation, characterized in that: The method comprises: According to characteristic information of the strike-slip fault in the seismic section, the strike-slip fault is divided into multiple sections; Determine the oil and gas transport capacity of each strike-slip fault during the reservoir formation period according to the angle between the regional principal stress direction and the fault strike during the reservoir formation period, the average density of sedimentary rocks, the formation water density, the fault dip, the burial depth of the fault point during the reservoir formation period, and the shale content of the fault rock; According to the oil and gas transport capacity of each strike-slip fault during the reservoir formation period and the preset oil and gas transport capacity screening rules, the strike-slip faults capable of transporting oil and gas during the reservoir formation period are determined; The oil and gas transport capacity of each strike-slip fault during the reservoir formation period is determined by the following formula: Where, T 成藏期 is the comprehensive evaluation index of the fault transport capacity of oil and gas during the accumulation period, β is the angle between the regional principal stress direction and the fault strike during the accumulation period, ρ r is the average density of sedimentary rock, ρ w is the formation water density, θ is the fault dip, Z 成藏期 is the burial depth of the fault point during the reservoir formation period, and SGR is the shale content of the fault rock.

2. The method for determining the oil and gas transport capacity of a strike-slip fault in the reservoir formation period by segment according to claim 1, characterized in that: Before determining the oil and gas transport capacity of each strike-slip fault during the reservoir formation period according to the angle between the regional principal stress direction and the fault strike during the reservoir formation period, the average density of sedimentary rocks, the formation water density, the fault dip, the buried depth of the fault point during the reservoir formation period, and the shale content of the fault rock, the method includes: The shale content of the fault rock is determined based on the thickness of the faulted strata, the shale content of the faulted strata, the fault distance and the number of faulted strata.

3. The method for determining the oil and gas transport capacity of a strike-slip fault in the reservoir formation period by segment according to claim 1, characterized in that: Determining the strike-slip faults capable of transporting oil and gas during the reservoir formation period according to the oil and gas transport capacity of each strike-slip fault during the reservoir formation period and the preset oil and gas transport capacity screening rules includes: It is determined whether the oil and gas transport capacity of each strike-slip fault during the accumulation period is greater than a preset oil and gas transport capacity threshold. If so, it is determined that the strike-slip fault has the ability to transport oil and gas during the accumulation period. Otherwise, it is determined that the strike-slip fault does not have the ability to transport oil and gas during the accumulation period.

4. The method for determining the oil and gas transport capacity of a strike-slip fault in the reservoir formation period by segment according to claim 1, characterized in that: The strike-slip fault is divided into multiple sections according to the characteristic information of the strike-slip fault in the seismic section, including: According to the fault throw, flower-shaped structure and thickness change of the upper and lower plates of the strike-slip fault in the seismic section, the strike-slip fault is divided into multiple sections according to the set length.

5. A device for determining the oil and gas transport capacity of a strike-slip fault in the reservoir formation period in sections, characterized in that: include: A strike-slip fault segmentation module, used to divide the strike-slip fault into multiple segments according to characteristic information of the strike-slip fault in the seismic profile; A module for determining oil and gas transport capacity, for determining the oil and gas transport capacity of each strike-slip fault during the reservoir formation period according to the angle between the principal stress direction of the region during the reservoir formation period and the fault strike, the average density of sedimentary rocks, the formation water density, the fault dip, the burial depth of the fault point during the reservoir formation period, and the shale content of the fault rock; A strike-slip fault screening module is used to determine the strike-slip faults that can transport oil and gas during the reservoir formation period according to the fault transport capacity of oil and gas during the reservoir formation period of each strike-slip fault and the preset oil and gas transport capacity screening rules; The oil and gas transport capacity determination module determines the oil and gas transport capacity of each strike-slip fault during the reservoir formation period by the following formula: Where, T 成藏期 is the comprehensive evaluation index of the fault transport capacity of oil and gas during the accumulation period, β is the angle between the regional principal stress direction and the fault strike during the accumulation period, ρ r is the average density of sedimentary rock, ρ w is the formation water density, θ is the fault dip, Z 成藏期 is the burial depth of the fault point during the reservoir formation period, and SGR is the shale content of the fault rock.

6. The device for determining the oil and gas transport capacity of a strike-slip fault in the reservoir formation period in sections according to claim 5 is characterized in that: Also includes: The fault rock shale content determination unit is used to determine the fault rock shale content according to the thickness of the faulted strata, the shale content of the faulted strata, the fault distance and the number of faulted strata.

7. The device for determining the oil and gas transport capacity of a strike-slip fault in the reservoir formation period in sections according to claim 5 is characterized in that: The strike-slip fault screening module comprises: The threshold judgment unit is used to judge whether the oil and gas transport capacity of each strike-slip fault during the accumulation period is greater than a preset oil and gas transport capacity threshold. If so, it is judged that the strike-slip fault has the ability to transport oil and gas during the accumulation period. Otherwise, it is judged that the strike-slip fault does not have the ability to transport oil and gas during the accumulation period.

8. The device for determining the oil and gas transport capacity of a strike-slip fault in the reservoir formation period in sections according to claim 5, characterized in that: The strike-slip fault segmentation module includes: The seismic profile feature division unit is used to divide the strike-slip fault into multiple sections according to the set length according to the fault distance, flower-shaped structure and thickness change of the upper and lower plates of the strike-slip fault in the seismic profile.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the method for determining the oil and gas transport capacity of a strike-slip fault during the reservoir formation period in sections as described in any one of claims 1 to 4 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for determining the oil and gas transport capacity of a strike-slip fault during the reservoir formation period in sections as described in any one of claims 1 to 4 are implemented.

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