Method and device for determining growth stage of strike-slip structure and storage medium

Abstract

The application discloses a method, device and storage medium for determining a growth stage of strike-slip structure, and the method comprises the following steps: obtaining a planar image of a fracture structure pattern of a region, and determining a straight line corresponding to each fracture line in the planar image; determining an included angle between adjacent straight lines, and determining a standard deviation of the included angles according to the included angles, wherein the included angle is an acute angle; and determining a growth stage of the strike-slip structure of the region according to the standard deviation of the included angles. The application discloses a method for determining a growth stage of strike-slip structure in a unified and objective manner.

Description

Technical Field

[0001] This invention relates to the field of geological exploration technology, and in particular to a method, apparatus and storage medium for determining the growth stage of strike-slip structures. Background Technology

[0002] Strike-slip deformation zones can be considered an important area for finding oil and gas breakthroughs. In recent years, they have received increasing attention from major oil and gas companies.

[0003] Several fault zones closely related to the evolution of surrounding basins, such as the Tanlu Fault Zone in the east, the Altun Fault Zone in the west, the Honghe Fault Zone in the south, and the Xilamulun River Tectonic Belt in the north, also exhibit strike-slip characteristics. A reasonable and objective evaluation of the oil and gas exploration potential within strike-slip deformation zones is of great guiding significance for the next stage of oil and gas exploration strategy deployment. Furthermore, classifying the evolutionary stages of strike-slip tectonic zones is an important aspect of understanding the characteristics of strike-slip tectonic activity and its oil and gas resource effects.

[0004] In existing technologies, the methods for dividing the growth stages of strike-slip structures are mainly at the qualitative descriptive level. For example, the conversion between left-hand and right-hand movement is used as the basis for dividing the growth stages, or the landmark events in the fault growth process are used as the basis for division. However, these methods are highly subjective, requiring the subjective experience of exploration personnel, and it is difficult to form a unified and objective method for determining the growth stages of strike-slip structures. In other words, the universality of the methods for determining the growth stages of strike-slip structures is low. Summary of the Invention

[0005] The main objective of this invention is to provide a method, apparatus, and storage medium for determining the growth stage of strike-slip structures in a region, aiming to solve the problem of low universality of methods for determining the growth stage of strike-slip structures.

[0006] To achieve the above objectives, the present invention provides a method for determining the growth stage of a strike-slip structure, the method comprising the following steps:

[0007] Obtain a planar image of the fracture structure pattern of the region, and determine the straight line corresponding to each fracture line in the planar image;

[0008] Determine the included angle between adjacent straight lines, and determine the standard deviation of the included angle based on each included angle, wherein the included angle is an acute angle;

[0009] The growth stage of the strike-slip structure in the region is determined based on the standard deviation of the included angle.

[0010] In one embodiment, the step of determining the straight line corresponding to each break line in the planar image includes:

[0011] Determine the curvature corresponding to each of the aforementioned fracture lines;

[0012] When the curvature is less than a preset threshold, connect the endpoints of the fracture line to obtain the straight line corresponding to the fracture line;

[0013] If the curvature is greater than or equal to a preset threshold, the bending point corresponding to the fracture line is determined, and the bending point is connected to the two endpoints of the fracture line respectively to obtain the straight line corresponding to the fracture line.

[0014] In one embodiment, the step of determining the included angle between adjacent lines includes:

[0015] Determine the included angle between the first intersecting lines, and determine the second non-intersecting lines;

[0016] Determine the third line that is closest to each of the second lines, and determine the angle between each of the second lines and the third line corresponding to the second line, wherein the intersecting first lines are adjacent lines, and the second line and the third line corresponding to the second line are adjacent lines.

[0017] In one embodiment, the step of determining the third line closest to each of the second lines includes:

[0018] Determine the line closest to each endpoint of the second line as the third line closest to the second line.

[0019] In one embodiment, the step of determining the standard deviation of the included angles based on each of the included angles includes:

[0020] Determine the average angle corresponding to each of the aforementioned included angles;

[0021] The standard deviation of the included angle is determined based on the average angle, each included angle, and the number of included angles.

[0022] In one embodiment, the step of determining the growth stage of the strike-slip structure in the region based on the standard deviation of the included angle includes:

[0023] Determine the numerical range in which the standard deviation of the included angle lies;

[0024] The growth stage of the strike-slip structure in the region is determined based on the numerical range.

[0025] In one embodiment, the step of determining the growth stage of the strike-slip structure in a region based on the numerical range includes:

[0026] When the numerical range is the first range, the strike-slip structure in the region is in the early growth stage;

[0027] When the numerical range is the second range, the strike-slip structure in the region is in the middle growth stage, and the lower limit of the second range is greater than or equal to the upper limit of the first range.

[0028] When the numerical range is the third range, the strike-slip structure in the region is in the mid-growth stage and the shear en echelon fracture stage, and the lower limit of the third range is greater than or equal to the upper limit of the second range.

[0029] When the numerical range is the fourth range, the strike-slip structure in the region is in the mature evolutionary stage and the shear en echelon fracture stage, and the lower limit of the fourth range is greater than or equal to the upper limit of the third range.

[0030] In one embodiment, when the numerical range is the fourth range and the planar image does not show folded deformation structures or positive flower-like structures, the strike-slip structure in the region is in the growth stage of the evolutionary maturity stage and the shear en echelon fracture stage.

[0031] When the numerical range is the fourth range, and the planar image shows anticline fold deformation structures and / or orthogonal flower-like structures, the strike-slip structure in the region is in the late evolutionary stage and the shear reversal stage.

[0032] To achieve the above objectives, the present invention also provides an apparatus for determining the growth stage of a slip structure. The apparatus includes a memory, a processor, and a determination program stored in the memory and executable on the processor. When the determination program is executed by the processor, it implements the various steps of the method for determining the growth stage of a slip structure as described above.

[0033] To achieve the above objectives, the present invention also provides a storage medium storing a determining program, which, when executed by a processor, implements the various steps of the method for determining the growth stage of the slip-slip structure as described above.

[0034] This invention provides a method, apparatus, and storage medium for determining the growth stage of strike-slip structures. The apparatus acquires a planar image of the fracture structure pattern in a region, determines the straight line corresponding to the fracture line representing the strike-slip structure in the planar image, determines the angle between adjacent straight lines, and determines the standard deviation of each angle. Based on the standard deviation of the angles, the growth stage of the strike-slip structure in the region is determined. This invention determines the standard deviation of the angles based on the straight lines corresponding to the fracture lines representing the strike-slip structure in the region, thereby determining the growth stage of the strike-slip structure in the region. This eliminates the need to rely on the subjective experience of exploration personnel to determine the growth stage of the strike-slip structure; that is, this invention provides a unified and objective method for determining the growth stage of strike-slip structures. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the hardware structure of the device for determining the growth stage of a strike-slip structure according to an embodiment of the present invention.

[0036] Figure 2 This is a flowchart illustrating the first embodiment of the method for determining the growth stage of strike-slip structures according to the present invention.

[0037] Figure 3 This is a simplified schematic diagram of the fracture structure pattern of the strike-slip structure obtained by simulation experiment using the method for determining the growth stage of the strike-slip structure according to the present invention.

[0038] Figure 4 A statistical graph showing the relationship between the degree of change in the fracture angle of the strike-slip zone and the displacement distance in a simulation experiment using the method for determining the growth stage of strike-slip structures.

[0039] Figure 5 This is a detailed flowchart of step S20 in the second embodiment of the method for determining the growth stage of the slip structure of the present invention.

[0040] Figure 6 This is a detailed flowchart of step S30 in the third embodiment of the method for determining the growth stage of the slip structure of the present invention.

[0041] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0043] Numerous studies have shown that strike-slip structures at different stages of growth and evolution have distinct effects on controlling oil and gas. Therefore, there is an urgent need for a universal method that can quantitatively describe and classify the various stages of the growth and evolution of strike-slip structures, providing a basis for summarizing the laws governing strike-slip structure control of oil and gas.

[0044] This invention addresses the lack of a unified and objective method for classifying the growth stages of strike-slip structures in existing technologies. It proposes a new mathematical and statistical method for classifying the growth stages of strike-slip structures, thereby enabling research on unfamiliar regions to determine their specific stages of strike-slip structure growth and providing geological theoretical support for summarizing the oil and gas control patterns of regional strike-slip structures.

[0045] The main solution of this invention is: to obtain a planar image of the fracture structure pattern of the region and to determine the straight line corresponding to each fracture line in the planar image; to determine the included angle between adjacent straight lines and to determine the standard deviation of the included angle based on each included angle, wherein the included angle is an acute angle; and to determine the growth stage of the strike-slip structure in the region based on the standard deviation of the included angle.

[0046] This invention determines the standard deviation of the included angle based on the straight line corresponding to the fault line characterizing the strike-slip structure in the region. Thus, the growth stage of the strike-slip structure in the region is determined according to the standard deviation of the included angle. This eliminates the need to rely on the subjective experience of exploration personnel to determine the growth stage of the strike-slip structure. In other words, this invention provides a unified and objective method for determining the growth stage of strike-slip structures.

[0047] like Figure 1 As shown, Figure 1 This is a schematic diagram of the hardware structure of the device for determining the growth stage of the slip structure involved in the embodiment of the present invention.

[0048] like Figure 1 As shown, the embodiment of the present invention relates to a device for determining the growth stage of a slip-slip structure. The device for determining the growth stage of a slip-slip structure is an electronic device, which can be a local computer or a cloud server, or a portable terminal such as a mobile phone. The device for determining the growth stage of a slip-slip structure may include: a processor 101, such as a CPU, a communication bus 102, and a memory 103. The communication bus 102 is used to realize communication between these components. Those skilled in the art will understand that... Figure 1 The structure shown does not constitute a limitation on the device for determining the growth stage of a strike-slip structure, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0049] like Figure 1 As shown, a memory, which is a computer storage medium, may include a program.

[0050] exist Figure 1 In the illustrated device, the processor 101 can be used to call a determination program stored in the memory 103 and perform the following operations:

[0051] Obtain a planar image of the fracture structure pattern of the region, and determine the straight line corresponding to each fracture line in the planar image;

[0052] Determine the included angle between adjacent straight lines, and determine the standard deviation of the included angle based on each included angle, wherein the included angle is an acute angle;

[0053] The growth stage of the strike-slip structure in the region is determined based on the standard deviation of the included angle.

[0054] In one embodiment, the processor 101 may invoke a determination program stored in the memory 103 and further perform the following operations:

[0055] Determine the curvature corresponding to each of the aforementioned fracture lines;

[0056] When the curvature is less than a preset threshold, connect the endpoints of the fracture line to obtain the straight line corresponding to the fracture line;

[0057] If the curvature is greater than or equal to a preset threshold, the bending point corresponding to the fracture line is determined, and the bending point is connected to the two endpoints of the fracture line respectively to obtain the straight line corresponding to the fracture line.

[0058] In one embodiment, the processor 101 may invoke a determination program stored in the memory 103 and further perform the following operations:

[0059] Determine the included angle between the first intersecting lines, and determine the second non-intersecting lines;

[0060] Determine the third line that is closest to each of the second lines, and determine the angle between each of the second lines and the third line corresponding to the second line, wherein the intersecting first lines are adjacent lines, and the second line and the third line corresponding to the second line are adjacent lines.

[0061] In one embodiment, the processor 101 may invoke a determination program stored in the memory 103 and further perform the following operations:

[0062] Determine the line closest to each endpoint of the second line as the third line closest to the second line.

[0063] In one embodiment, the processor 101 may invoke a determination program stored in the memory 103 and further perform the following operations:

[0064] Determine the average angle corresponding to each of the aforementioned included angles;

[0065] The standard deviation of the included angle is determined based on the average angle, each included angle, and the number of included angles.

[0066] In one embodiment, the processor 101 may invoke a determination program stored in the memory 103 and further perform the following operations:

[0067] Determine the numerical range in which the standard deviation of the included angle lies;

[0068] The growth stage of the strike-slip structure in the region is determined based on the numerical range.

[0069] In one embodiment, the processor 101 may invoke a determination program stored in the memory 103 and further perform the following operations:

[0070] When the numerical range is the first range, the strike-slip structure in the region is in the early growth stage;

[0071] When the numerical range is the second range, the strike-slip structure in the region is in the middle growth stage, and the lower limit of the second range is greater than or equal to the upper limit of the first range.

[0072] When the numerical range is the third range, the strike-slip structure in the region is in the mid-growth stage and the shear en echelon fracture stage, and the lower limit of the third range is greater than or equal to the upper limit of the second range.

[0073] When the numerical range is the fourth range, the strike-slip structure in the region is in the mature evolutionary stage and the shear en echelon fracture stage, and the lower limit of the fourth range is greater than or equal to the upper limit of the third range.

[0074] In one embodiment, the processor 101 may invoke a determination program stored in the memory 103 and further perform the following operations:

[0075] When the numerical range is the fourth range and the planar image does not show folded deformation structures or positive flower-like structures, the strike-slip structure in the region is in the growth stage of the evolutionary maturity stage and the shear en echelon fracture stage.

[0076] When the numerical range is the fourth range, and the planar image shows anticline fold deformation structures and / or orthogonal flower-like structures, the strike-slip structure in the region is in the late evolutionary stage and the shear reversal stage.

[0077] In this embodiment, according to the above scheme, the strike-slip structure growth stage determination device acquires a planar image of the fracture structure pattern of the region, determines the straight line corresponding to the fracture line representing the strike-slip structure in the planar image, determines the included angle between adjacent straight lines, and determines the standard deviation of the included angle based on each included angle. Therefore, the growth stage of the strike-slip structure in the region is determined based on the standard deviation of the included angle. This invention determines the standard deviation of the included angle based on the straight line corresponding to the fracture line representing the strike-slip structure in the region, thereby determining the growth stage of the strike-slip structure in the region based on the standard deviation of the included angle. This eliminates the need to rely on the subjective experience of exploration personnel to determine the growth stage of the strike-slip structure; that is, this invention provides a unified and objective method for determining the growth stage of strike-slip structures.

[0078] Based on the hardware architecture of the above-mentioned device for determining the growth stage of strike-slip structures, an embodiment of the method for determining the growth stage of strike-slip structures according to the present invention is proposed.

[0079] Reference Figure 2 , Figure 2 This is a first embodiment of the method for determining the growth stage of a strike-slip structure according to the present invention. The method for determining the growth stage of a strike-slip structure includes the following steps:

[0080] Step S10: Obtain a planar image of the fracture structure pattern of the region;

[0081] In this embodiment, the executing entity is a device for determining the growth stage of strike-slip structures. For ease of description, the term "device" will be used hereinafter to refer to this device. The device first acquires parameters characterizing the planar fault structure style of the area under test, such as planar seismic data, coherence slices, and photographs, as well as parameters characterizing the sectional structure of the area, such as seismic profiles. Among these, the relevant data on the planar fault structure style are the primary parameters. Using these parameters, the device can obtain a planar image of the fault structure style of the area; this planar image is a planar planar image.

[0082] Specifically, the instrument urgently needs to determine the fault strike direction of strike-slip structures based on the aforementioned parameters, i.e., it needs to perform fault strike direction analysis, primarily targeting R-fractures in the stratigraphic caprock. During the statistical process, it is necessary to identify typical "flower-like" or "floral" structures of strike-slip faults, and mainly select shallow data located in the "petals" of these structures for seismic profile slicing. In the deep structural patterns of strike-slip structures, faults are mostly steep and continuous fracture surfaces, while the faults in the "stem" portion of the structure are not statistically analyzed, i.e., not used for seismic profile slicing. Through this method, the instrument can obtain a planar image of the fault structure patterns in the region. The planar image contains multiple lines representing the fault strike direction, which are defined here as fault lines.

[0083] Step S20: Determine the straight line corresponding to each break line in the planar image;

[0084] The planar image contains multiple fracture lines, most of which are curved. Some fracture lines have a high degree of curvature, while others have a low degree of curvature. The device can perform linear fitting on these fracture lines to obtain straight lines representing the fracture direction of the strike-slip structure, with each straight line corresponding to a fracture line. It should be noted that a fracture line can correspond to multiple straight lines; that is, when the fracture line has a high degree of curvature, it can be represented by dividing the fracture line into multiple straight lines.

[0085] Step S30: Determine the included angle between adjacent straight lines, wherein the included angle is an acute angle;

[0086] After obtaining multiple straight lines, the device can determine the included angle between connected lines. Connected lines can be intersecting lines, or lines connected to each other with a distance closest to their endpoints. Once all connected lines are determined, the device can calculate the included angle between them, thus obtaining multiple angles. It should be noted that when two lines intersect, the acute angle is taken as the included angle between the two lines.

[0087] Step S40: Determine the standard deviation of the included angles based on each of the included angles;

[0088] After obtaining multiple included angles, the device can calculate the standard deviation of these included angles. Specifically, the device first determines the number of included angles, then sums the included angles to obtain a sum. Dividing this sum by the number of included angles yields the average angle for each included angle. The device then determines the standard deviation of the included angles based on the average angle, the individual included angles, and the number of included angles. This is achieved by first calculating the squared difference between each included angle and the average angle, then summing the squared differences to obtain a sum of squared differences. Dividing this sum of squared differences by the number of included angles yields the square of the standard deviation. The device can calculate the standard deviation using the following formula:

[0089]

[0090] Where S is the standard deviation, M is the mean angle, and x is the mean angle. n Let n be the angle between the lines, and n be the number of angles.

[0091] Step S50: Determine the growth stage of the strike-slip structure in the region based on the standard deviation of the included angle.

[0092] The magnitude of the standard deviation can be used to characterize the growth stage of a strike-slip structure. The apparatus determines the numerical range of the standard deviation of the included angle, and then determines the growth stage of the strike-slip structure in the region based on the numerical range.

[0093] Specifically, when the numerical range is the first range, the strike-slip structure in the region is in the early growth stage.

[0094] When the numerical range is the second range, the strike-slip structure in the region is in the middle growth stage, and the lower limit of the second range is greater than or equal to the upper limit of the first range.

[0095] When the numerical range is the third range, the strike-slip structure in the region is in the middle growth stage and the shear en echelon fracture stage, and the lower limit of the third range is greater than or equal to the upper limit of the second range.

[0096] When the numerical range is the fourth range, the strike-slip structure in the region is in the mature evolutionary stage and the shear en echelon rupture stage. The lower limit of the fourth range is greater than or equal to the upper limit of the third range.

[0097] It should be noted that when the numerical range is the fourth range and the planar image does not show folded deformation structures or orthogonal flower-like structures, the strike-slip structure in the region is in the mature evolutionary stage and the shear en echelon rupture stage; when the numerical range is the fourth range and the planar image shows anticline folded deformation structures and / or orthogonal flower-like structures, the strike-slip structure in the region is in the late evolutionary stage and the shear reversal stage.

[0098] The following is an example. A reference table is provided in the device, as shown in Table-1:

[0099] Table 1. Comparison of Standard Deviation of Fault Strike with Fault Growth and Evolution Stages

[0100]

[0101] When the standard deviation (angle standard deviation) is 2 and does not exceed 4, the strike-slip faults in the region are considered to have a relatively consistent overall trend, indicating that the strike-slip structure is in the early stage of growth, with small fault displacements and no deviation in the trend of individual faults, indicating a stage of shear unidirectional fracturing. When the standard deviation is between 4 and 8, the strike-slip faults in the region are considered to have a relatively consistent overall trend, but some deviations have occurred, with many fault connections, indicating that the strike-slip structure is in the middle stage of growth, with larger fault displacements, indicating a stage of shear en echelon fracturing. When the standard deviation is greater than 8, or even higher than 9, and no obvious [symbols] are observed on the cross-section... If the strike-slip fault in the region exhibits folded deformation or orthogonal floral structures, but does not form obvious linear folds on the plane, it indicates that the main displacement zone has been formed and the strike-slip structure is in the mature stage of evolution. At this time, the strike-slip displacement is large, and different parts of the fault may form a combination of various structural styles, indicating that the region is in the shear segmentation and fracturing stage. When the standard deviation is greater than 8, or even higher than 9, and obvious folded deformation or orthogonal floral structures have been developed in the cross-section, and obvious linear folds are visible on the plane, it is considered that the strike-slip structure is in the late stage of evolution and has undergone tectonic reversal and modification. The strike-slip structure in the region is in the shear reversal and modification stage.

[0102] Furthermore, this invention also uses the above method to analyze the physical simulation of Riedel shear in wet clay, and determines the various stages experienced by the strike-slip structure during the simulation experiment. The specific steps are as follows:

[0103] 1. Through steps S10 and S20 above, the planar image formed during the experiment is simplified, the curved fracture line is simplified into a straight line, and some fracture lines that extend for a long time and have undergone multiple bends are transformed into multiple straight lines, such as... Figure 3 As shown;

[0104] 2. According to step S30, determine the included angle between adjacent lines, and avoid measuring a line repeatedly. Table 2 is obtained as follows:

[0105] Table 2. Statistical Table of Fracture Data

[0106]

[0107]

[0108] Where D is the displacement distance in the physical simulation experiment;

[0109] 3. Obtain the standard deviation of the included angle through step S40, as detailed in Table 3:

[0110] Table 3. Comparison of Displacement Distance and Standard Deviation

[0111]

[0112]

[0113] The data in Table-3 is visualized using a planar image. Figure 4 , Figure 4 This is a statistical chart showing the relationship between the degree of change in the fracture angle of the strike-slip zone and the displacement distance;

[0114] 4. Determine the growth stage of the strike-slip structure according to the division method in step S10; when the displacement in the structural physics simulation experiment is 8.9 mm, this displacement is relatively small relative to the scale of the entire simulation experiment, and the standard deviation of the fracture angle is about 2.97. The strike-slip fractures in the experiment are mainly small fractures arranged in a nearly parallel oblique direction. At this time, the overall direction of the fractures is relatively consistent, and the strike-slip structure in the experimental platform is in the shear unidirectional fracture stage; when the displacement increases to 13.3 mm, the standard deviation of the fracture angle is about 4.40. The direction of the small fractures formed in the experiment changes, forming a typical en echelon structure. The strike-slip structure in the experimental platform is in the shear en echelon fracture stage. When the displacement increases to 19.5 mm, the displacement is relatively large relative to the entire experimental platform, and the standard deviation of the fracture angle is about 8.34. The fracture connection on the plane forms the main displacement zone, and the strike-slip structure in the experimental platform is in the shear segmented fracture stage. When the displacement is 27.2 mm and 36.0 mm, the standard deviation of the fracture angle on the plane is between 8 and 9, and does not increase with the increase of displacement. This indicates that the displacement of the strike-slip activity has been transmitted through the main displacement zone, and the newly formed fracture orientation changes little or does not form more new fracture structures during the tectonic activity.

[0115] Through simulation experiments, it can be proven that the idea of ​​statistically analyzing the angles of adjacent fractures from the perspective of the orderliness of fracture strikes in this embodiment to delineate the stages of strike-slip tectonic growth and evolution is reasonable and effective; the rotation of strikes, the formation of en echelon fractures and the connection of the main displacement zone are also corresponding landmark events in the process of strike-slip tectonic growth.

[0116] Previous studies have provided a qualitative understanding of the growth and evolution of strike-slip structures, identifying landmark events such as the bending of en echelon faults and the connection of main displacement zones. However, subjectivity in determining the evolutionary stage of a strike-slip structure remains, depending on the precision of the data and the individual's assessment. An objective, quantitative method for determining the evolutionary stage of a strike-slip structure is lacking. This embodiment utilizes the statistical results of angles between adjacent faults as the basis for determining the growth and evolutionary stage of a strike-slip structure. Based on the different distribution ranges of the standard deviation of the included angles, combined with the structural morphology of the cross-section, the growth and development stages of strike-slip structures can be divided into four stages: shear unidirectional fracturing stage (early growth stage), shear en echelon fracturing stage (mid-growth stage), shear segmented fracturing stage (mature evolution stage), and shear reversal and modification stage (late evolution stage). This method effectively avoids the influence of uncertainties such as varying interpretation precision, data quality, and subjective differences among operators on the determination process, and can serve as a quantitative evaluation basis for studying the activity characteristics of strike-slip structural zones and their hydrocarbon resource effects.

[0117] In the technical solution provided in this embodiment, the device for determining the growth stage of strike-slip structures acquires a planar image of the fracture structure pattern in a region, determines the straight line corresponding to the fracture line representing the strike-slip structure in the planar image, determines the angle between adjacent straight lines, and determines the standard deviation of the angle based on each angle. Therefore, the growth stage of the strike-slip structure in the region is determined based on the standard deviation of the angle. This invention determines the standard deviation of the angle based on the straight line corresponding to the fracture line representing the strike-slip structure in the region, thereby determining the growth stage of the strike-slip structure in the region based on the standard deviation of the angle. This eliminates the need to rely on the subjective experience of exploration personnel to determine the growth stage of the strike-slip structure; that is, this invention provides a unified and objective method for determining the growth stage of strike-slip structures.

[0118] Reference Figure 5 , Figure 5 In this second embodiment of the growth stage of the strike-slip structure of the present invention, based on the first embodiment, step S20 includes:

[0119] Step S21: Determine the curvature corresponding to each fracture line;

[0120] Step S22: When the curvature is less than a preset threshold, connect the endpoints of the fracture line to obtain the straight line corresponding to the fracture line;

[0121] Step S23: When the curvature is greater than or equal to a preset threshold, determine the bending point corresponding to the fracture line, and connect the bending point to the two endpoints of the fracture line respectively to obtain the straight line corresponding to the fracture line.

[0122] In this embodiment, the device first determines the curvature of each fracture line. Curvature characterizes the degree of bending of the fracture line. The device can select two points on the fracture line and draw tangents to the fracture line based on these two points. The angle between the two tangents characterizes the curvature. The greater the curvature, the smaller the angle between the tangents. If the curvature is less than a preset threshold, i.e., the angle between the tangents is greater than a preset angle, then connecting the two endpoints of the fracture line yields a straight line representing the fracture direction. If the curvature is greater than or equal to the preset threshold, i.e., the angle between the tangents is less than or equal to a preset angle, then the corresponding bending point of the fracture line is determined, and the bending point is connected to the two endpoints of the fracture line to obtain two straight lines corresponding to the fracture line. The bending point can be the point projected onto the fracture line from the intersection of the two tangents. Of course, a fracture line may have multiple bending points; therefore, adjacent bending points are connected to form the straight lines corresponding to the fracture line, and the bending point closest to the endpoint is connected to that endpoint.

[0123] In the technical solution provided in this embodiment, the device determines the curvature of each fracture line. If the curvature is small, the fracture line is close to a straight line, and the endpoints of the fracture line are connected. If the curvature is large, the bending point is determined, and a straight line is determined by the bending point and the two endpoints of the fracture line, thereby accurately determining the straight line corresponding to each fracture line.

[0124] Reference Figure 6 , Figure 6 In a third embodiment of the method for determining the growth stage of strike-slip structures according to the present invention, based on the first or second embodiment, step S30 includes:

[0125] Step S31: Determine the included angle between the first intersecting lines and determine the second non-intersecting lines;

[0126] Step S32: Determine the third line that is closest to each of the second lines, and determine the angle between each of the second lines and the third line corresponding to the second line, wherein the intersecting first lines are adjacent lines, and the second line and the third line corresponding to the second line are adjacent lines.

[0127] In this embodiment, the device first determines the intersecting first straight lines, and prioritizes calculating the angle between the intersecting first straight lines. Some straight lines do not intersect any other straight lines; these are defined as second straight lines. The device needs to determine the nearest third straight line to each second straight line. The device can select a reference point on the second straight line and determine the perpendicular line corresponding to each second straight line, which must pass through the reference point. Based on the perpendicular line passing through the reference point, the device determines the distance between the second straight line and other straight lines. The device then selects the closest straight line as the third straight line corresponding to that second straight line, and calculates the angle between the second straight line and the corresponding third straight line. It should be noted that the intersecting first straight lines are adjacent straight lines, and the second straight line and its corresponding third straight line are also adjacent straight lines.

[0128] Furthermore, the device can use the two endpoints of the second straight line as reference points to determine the straight line closest to each endpoint of the second straight line as the third straight line corresponding to the second straight line, thereby calculating the angle between the second straight line and the third straight line.

[0129] In the technical solution provided in this embodiment, the device determines the included angle between the first intersecting straight lines, and determines the second straight line that does not intersect with other straight lines, and then determines the third straight line that is closest to the second straight line, thereby determining the included angle between the second straight line and the third straight line, avoiding inaccurate determination of the slip-out structure due to missed calculation of the included angle.

[0130] The present invention also provides an apparatus for determining the growth stage of a strike-slip structure. The apparatus includes a memory, a processor, and a determination program stored in the memory and executable on the processor. When executed by the processor, the determination program performs the following steps:

[0131] Step S10: Obtain a planar image of the fracture structure pattern of the region;

[0132] In this embodiment, the executing entity is a device for determining the growth stage of strike-slip structures. For ease of description, the term "device" will be used hereinafter to refer to this device. The device first acquires parameters characterizing the planar fault structure style of the area under test, such as planar seismic data, coherence slices, and photographs, as well as parameters characterizing the sectional structure of the area, such as seismic profiles. Among these, the relevant data on the planar fault structure style are the primary parameters. Using these parameters, the device can obtain a planar image of the fault structure style of the area; this planar image is a planar planar image.

[0133] Specifically, the instrument urgently needs to determine the fault strike direction of strike-slip structures based on the aforementioned parameters, i.e., it needs to perform fault strike direction analysis, primarily targeting R-fractures in the stratigraphic caprock. During the statistical process, it is necessary to identify typical "flower-like" or "floral" structures of strike-slip faults, and mainly select shallow data located in the "petals" of these structures for seismic profile slicing. In the deep structural patterns of strike-slip structures, faults are mostly steep and continuous fracture surfaces, while the faults in the "stem" portion of the structure are not statistically analyzed, i.e., not used for seismic profile slicing. Through this method, the instrument can obtain a planar image of the fault structure patterns in the region. The planar image contains multiple lines representing the fault strike direction, which are defined here as fault lines.

[0134] Step S20: Determine the straight line corresponding to each break line in the planar image;

[0135] The planar image contains multiple fracture lines, most of which are curved. Some fracture lines have a high degree of curvature, while others have a low degree of curvature. The device can perform linear fitting on these fracture lines to obtain straight lines representing the fracture direction of the strike-slip structure, with each straight line corresponding to a fracture line. It should be noted that a fracture line can correspond to multiple straight lines; that is, when the fracture line has a high degree of curvature, it can be represented by dividing the fracture line into multiple straight lines.

[0136] Step S30: Determine the included angle between adjacent straight lines, wherein the included angle is an acute angle;

[0137] After obtaining multiple straight lines, the device can determine the included angle between connected lines. Connected lines can be intersecting lines, or lines connected to each other with a distance closest to their endpoints. Once all connected lines are determined, the device can calculate the included angle between them, thus obtaining multiple angles. It should be noted that when two lines intersect, the acute angle is taken as the included angle between the two lines.

[0138] Step S40: Determine the standard deviation of the included angles based on each of the included angles;

[0139] After obtaining multiple included angles, the device can calculate the standard deviation of these included angles. Specifically, the device first determines the number of included angles, then sums the included angles to obtain a sum. Dividing this sum by the number of included angles yields the average angle for each included angle. The device then determines the standard deviation of the included angles based on the average angle, the individual included angles, and the number of included angles. This is achieved by first calculating the squared difference between each included angle and the average angle, then summing the squared differences to obtain a sum of squared differences. Dividing this sum of squared differences by the number of included angles yields the square of the standard deviation. The device can calculate the standard deviation using the following formula:

[0140]

[0141] Where S is the standard deviation, M is the mean angle, and x is the mean angle. n Let n be the angle between the lines, and n be the number of angles.

[0142] Step S50: Determine the growth stage of the strike-slip structure in the region based on the standard deviation of the included angle.

[0143] The magnitude of the standard deviation can be used to characterize the growth stage of a strike-slip structure. The apparatus determines the numerical range of the standard deviation of the included angle, and then determines the growth stage of the strike-slip structure in the region based on the numerical range.

[0144] Specifically, when the numerical range is the first range, the strike-slip structure in the region is in the early growth stage.

[0145] When the numerical range is the second range, the strike-slip structure in the region is in the middle growth stage, and the lower limit of the second range is greater than or equal to the upper limit of the first range.

[0146] When the numerical range is the third range, the strike-slip structure in the region is in the middle growth stage and the shear en echelon fracture stage, and the lower limit of the third range is greater than or equal to the upper limit of the second range.

[0147] When the numerical range is the fourth range, the strike-slip structure in the region is in the mature evolutionary stage and the shear en echelon rupture stage. The lower limit of the fourth range is greater than or equal to the upper limit of the third range.

[0148] It should be noted that when the numerical range is the fourth range and the planar image does not show folded deformation structures or orthogonal flower-like structures, the strike-slip structure in the region is in the mature evolutionary stage and the shear en echelon rupture stage; when the numerical range is the fourth range and the planar image shows anticline folded deformation structures and / or orthogonal flower-like structures, the strike-slip structure in the region is in the late evolutionary stage and the shear reversal stage.

[0149] The following is an example. A reference table is provided in the device, as shown in Table-1:

[0150] Table 1. Comparison of Standard Deviation of Fault Strike with Fault Growth and Evolution Stages

[0151]

[0152] When the standard deviation (angle standard deviation) is 2 and does not exceed 4, the strike-slip faults in the region are considered to have a relatively consistent overall trend, indicating that the strike-slip structure is in the early stage of growth, with small fault displacements and no deviation in the trend of individual faults, indicating a stage of shear unidirectional fracturing. When the standard deviation is between 4 and 8, the strike-slip faults in the region are considered to have a relatively consistent overall trend, but some deviations have occurred, with many fault connections, indicating that the strike-slip structure is in the middle stage of growth, with larger fault displacements, indicating a stage of shear en echelon fracturing. When the standard deviation is greater than 8, or even higher than 9, and no obvious [symbols] are observed on the cross-section... If the strike-slip fault in the region exhibits folded deformation or orthogonal floral structures, but does not form obvious linear folds on the plane, it indicates that the main displacement zone has been formed and the strike-slip structure is in the mature stage of evolution. At this time, the strike-slip displacement is large, and different parts of the fault may form a combination of various structural styles, indicating that the region is in the shear segmentation and fracturing stage. When the standard deviation is greater than 8, or even higher than 9, and obvious folded deformation or orthogonal floral structures have been developed in the cross-section, and obvious linear folds are visible on the plane, it is considered that the strike-slip structure is in the late stage of evolution and has undergone tectonic reversal and modification. The strike-slip structure in the region is in the shear reversal and modification stage.

[0153] Furthermore, this invention also uses the above method to analyze the physical simulation of Riedel shear in wet clay, and determines the various stages experienced by the strike-slip structure during the simulation experiment. The specific steps are as follows:

[0154] 1. Through steps S10 and S20 above, the planar image formed during the experiment is simplified, the curved fracture line is simplified into a straight line, and some fracture lines that extend for a long time and have undergone multiple bends are transformed into multiple straight lines, such as... Figure 3 As shown;

[0155] 2. According to step S30, determine the included angle between adjacent lines, and avoid measuring a line repeatedly. Table 2 is obtained as follows:

[0156] Table 2. Statistical Table of Fracture Data

[0157]

[0158]

[0159] Where D is the displacement distance in the physical simulation experiment;

[0160] 3. Obtain the standard deviation of the included angle through step S40, as detailed in Table 3:

[0161] Table 3. Comparison of Displacement Distance and Standard Deviation

[0162]

[0163] The data in Table-3 is visualized using a planar image. Figure 4 , Figure 4 This is a statistical chart showing the relationship between the degree of change in the fracture angle of the strike-slip zone and the displacement distance;

[0164] 4. Determine the growth stage of the strike-slip structure according to the division method in step S10; when the displacement in the structural physics simulation experiment is 8.9 mm, this displacement is relatively small relative to the scale of the entire simulation experiment, and the standard deviation of the fracture angle is about 2.97. The strike-slip fractures in the experiment are mainly small fractures arranged in a nearly parallel oblique direction. At this time, the overall direction of the fractures is relatively consistent, and the strike-slip structure in the experimental platform is in the shear unidirectional fracture stage; when the displacement increases to 13.3 mm, the standard deviation of the fracture angle is about 4.40. The direction of the small fractures formed in the experiment changes, forming a typical en echelon structure. The strike-slip structure in the experimental platform is in the shear en echelon fracture stage. When the displacement increases to 19.5 mm, the displacement is relatively large relative to the entire experimental platform, and the standard deviation of the fracture angle is about 8.34. The fracture connection on the plane forms the main displacement zone, and the strike-slip structure in the experimental platform is in the shear segmented fracture stage. When the displacement is 27.2 mm and 36.0 mm, the standard deviation of the fracture angle on the plane is between 8 and 9, and does not increase with the increase of displacement. This indicates that the displacement of the strike-slip activity has been transmitted through the main displacement zone, and the newly formed fracture orientation changes little or does not form more new fracture structures during the tectonic activity.

[0165] Through simulation experiments, it can be proven that the idea of ​​statistically analyzing the angles of adjacent fractures from the perspective of the orderliness of fracture strikes in this embodiment to delineate the stages of strike-slip tectonic growth and evolution is reasonable and effective; the rotation of strikes, the formation of en echelon fractures and the connection of the main displacement zone are also corresponding landmark events in the process of strike-slip tectonic growth.

[0166] Previous studies have provided a qualitative understanding of the growth and evolution of strike-slip structures, identifying landmark events such as the bending of en echelon faults and the connection of main displacement zones. However, subjectivity in determining the evolutionary stage of a strike-slip structure remains, depending on the precision of the data and the individual's assessment. An objective, quantitative method for determining the evolutionary stage of a strike-slip structure is lacking. This embodiment utilizes the statistical results of angles between adjacent faults as the basis for determining the growth and evolutionary stage of a strike-slip structure. Based on the different distribution ranges of the standard deviation of the included angles, combined with the structural morphology of the cross-section, the growth and development stages of strike-slip structures can be divided into four stages: shear unidirectional fracturing stage (early growth stage), shear en echelon fracturing stage (mid-growth stage), shear segmented fracturing stage (mature evolution stage), and shear reversal and modification stage (late evolution stage). This method effectively avoids the influence of uncertainties such as varying interpretation precision, data quality, and subjective differences among operators on the determination process, and can serve as a quantitative evaluation basis for studying the activity characteristics of strike-slip structural zones and their hydrocarbon resource effects.

[0167] In the technical solution provided in this embodiment, the device for determining the growth stage of strike-slip structures acquires a planar image of the fracture structure pattern in a region, determines the straight line corresponding to the fracture line representing the strike-slip structure in the planar image, determines the angle between adjacent straight lines, and determines the standard deviation of the angle based on each angle. Therefore, the growth stage of the strike-slip structure in the region is determined based on the standard deviation of the angle. This invention determines the standard deviation of the angle based on the straight line corresponding to the fracture line representing the strike-slip structure in the region, thereby determining the growth stage of the strike-slip structure in the region based on the standard deviation of the angle. This eliminates the need to rely on the subjective experience of exploration personnel to determine the growth stage of the strike-slip structure; that is, this invention provides a unified and objective method for determining the growth stage of strike-slip structures.

[0168] In one embodiment, when the determination program in the run-slip structure growth stage determination device is executed by the processor, it performs the following steps:

[0169] Step S21: Determine the curvature corresponding to each fracture line;

[0170] Step S22: When the curvature is less than a preset threshold, connect the endpoints of the fracture line to obtain the straight line corresponding to the fracture line;

[0171] Step S23: When the curvature is greater than or equal to a preset threshold, determine the bending point corresponding to the fracture line, and connect the bending point to the two endpoints of the fracture line respectively to obtain the straight line corresponding to the fracture line.

[0172] In this embodiment, the device first determines the curvature of each fracture line. Curvature characterizes the degree of bending of the fracture line. The device can select two points on the fracture line and draw tangents to the fracture line based on these two points. The angle between the two tangents characterizes the curvature. The greater the curvature, the smaller the angle between the tangents. If the curvature is less than a preset threshold, i.e., the angle between the tangents is greater than a preset angle, then connecting the two endpoints of the fracture line yields a straight line representing the fracture direction. If the curvature is greater than or equal to the preset threshold, i.e., the angle between the tangents is less than or equal to a preset angle, then the corresponding bending point of the fracture line is determined, and the bending point is connected to the two endpoints of the fracture line to obtain two straight lines corresponding to the fracture line. The bending point can be the point projected onto the fracture line from the intersection of the two tangents. Of course, a fracture line may have multiple bending points; therefore, adjacent bending points are connected to form the straight lines corresponding to the fracture line, and the bending point closest to the endpoint is connected to that endpoint.

[0173] In the technical solution provided in this embodiment, the device determines the curvature of each fracture line. If the curvature is small, the fracture line is close to a straight line, and the endpoints of the fracture line are connected. If the curvature is large, the bending point is determined, and a straight line is determined by the bending point and the two endpoints of the fracture line, thereby accurately determining the straight line corresponding to each fracture line.

[0174] In one embodiment, when the determination program in the run-slip structure growth stage determination device is executed by the processor, it performs the following steps:

[0175] Step S31: Determine the included angle between the first intersecting lines and determine the second non-intersecting lines;

[0176] Step S32: Determine the third line that is closest to each of the second lines, and determine the angle between each of the second lines and the third line corresponding to the second line, wherein the intersecting first lines are adjacent lines, and the second line and the third line corresponding to the second line are adjacent lines.

[0177] In this embodiment, the device first determines the intersecting first straight lines, and prioritizes calculating the angle between the intersecting first straight lines. Some straight lines do not intersect any other straight lines; these are defined as second straight lines. The device needs to determine the nearest third straight line to each second straight line. The device can select a reference point on the second straight line and determine the perpendicular line corresponding to each second straight line, which must pass through the reference point. Based on the perpendicular line passing through the reference point, the device determines the distance between the second straight line and other straight lines. The device then selects the closest straight line as the third straight line corresponding to that second straight line, and calculates the angle between the second straight line and the corresponding third straight line. It should be noted that the intersecting first straight lines are adjacent straight lines, and the second straight line and its corresponding third straight line are also adjacent straight lines.

[0178] Furthermore, the device can use the two endpoints of the second straight line as reference points to determine the straight line closest to each endpoint of the second straight line as the third straight line corresponding to the second straight line, thereby calculating the angle between the second straight line and the third straight line.

[0179] In the technical solution provided in this embodiment, the device determines the included angle between the first intersecting straight lines, and determines the second straight line that does not intersect with other straight lines, and then determines the third straight line that is closest to the second straight line, thereby determining the included angle between the second straight line and the third straight line, avoiding inaccurate determination of the slip-out structure due to missed calculation of the included angle.

[0180] The present invention also provides a storage medium storing a determining program, which, when executed by a processor, implements the various steps of the method for determining the growth stage of a slip-slip structure as described in the above embodiments.

[0181] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0182] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0183] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0184] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for determining the growth stages of a strike-slip structure, characterized in that, The method for determining the growth stage of the strike-slip structure includes the following steps: Obtain a planar image of the fracture structure pattern of the region, and determine the straight line corresponding to each fracture line in the planar image; Determine the included angle between adjacent straight lines, and determine the standard deviation of the included angle based on each included angle, wherein the included angle is an acute angle; The growth stage of the strike-slip structure in the region is determined based on the standard deviation of the included angle. The step of determining the straight line corresponding to each break line in the planar image includes: determining the curvature of each break line; when the curvature is less than a preset threshold, connecting the endpoints of the break line to obtain the straight line corresponding to the break line; when the curvature is greater than or equal to the preset threshold, determining the bending point of the break line, and connecting the bending point to the two endpoints of the break line respectively to obtain the straight line corresponding to the break line. The step of determining the included angle between adjacent straight lines includes: determining the included angle between intersecting first straight lines and determining non-intersecting second straight lines; determining the third straight line closest to each second straight line and determining the included angle between each second straight line and the third straight line corresponding to the second straight line, wherein the intersecting first straight lines are adjacent straight lines, and the second straight line and the third straight line corresponding to the second straight line are adjacent straight lines.

2. The method for determining the growth stage of a strike-slip structure as described in claim 1, characterized in that, The step of determining the third line that is closest to each of the second lines includes: Determine the line closest to each endpoint of the second line as the third line closest to the second line.

3. The method for determining the growth stage of a strike-slip structure as described in claim 1, characterized in that, The step of determining the standard deviation of the included angles based on each of the included angles includes: Determine the average angle corresponding to each of the aforementioned included angles; The standard deviation of the included angle is determined based on the average angle, each included angle, and the number of included angles.

4. The method for determining the growth stage of a strike-slip structure as described in any one of claims 1-3, characterized in that, The step of determining the growth stage of the strike-slip structure in the region based on the standard deviation of the included angle includes: Determine the numerical range in which the standard deviation of the included angle lies; The growth stage of the strike-slip structure in the region is determined based on the numerical range.

5. The method for determining the growth stage of a strike-slip structure as described in claim 4, characterized in that, The step of determining the growth stage of the strike-slip structure in a region based on the numerical range includes: When the numerical range is the first range, the strike-slip structure in the region is in the early growth stage; When the numerical range is the second range, the strike-slip structure in the region is in the middle growth stage, and the lower limit of the second range is greater than or equal to the upper limit of the first range. When the numerical range is the third range, the strike-slip structure in the region is in the mid-growth stage and the shear en echelon fracture stage, and the lower limit of the third range is greater than or equal to the upper limit of the second range. When the numerical range is the fourth range, the strike-slip structure in the region is in the mature evolutionary stage and the shear en echelon fracture stage, and the lower limit of the fourth range is greater than or equal to the upper limit of the third range.

6. The method for determining the growth stage of a strike-slip structure as described in claim 5, characterized in that, When the numerical range is the fourth range and the planar image does not show folded deformation structures or positive flower-like structures, the strike-slip structure in the region is in the growth stage of the evolutionary maturity stage and the shear en echelon fracture stage. When the numerical range is the fourth range, and the planar image shows anticline fold deformation structures and / or orthogonal flower-like structures, the strike-slip structure in the region is in the late evolutionary stage and the shear reversal stage.

7. A device for determining the growth stage of a strike-slip structure, characterized in that, The apparatus for determining the growth stage of a slip-slip structure includes a memory, a processor, and a determination program stored in the memory and executable on the processor. When executed by the processor, the determination program implements the various steps of the method for determining the growth stage of a slip-slip structure as described in any one of claims 1-6.

8. A storage medium, characterized in that, The storage medium stores a determining program, which, when executed by a processor, implements the various steps of the method for determining the growth stage of a strike-slip structure as described in any one of claims 1-6.

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