Multi-stage strike-slip fracture plane activity difference characterization method and system

Abstract

The invention discloses a multi-stage strike-slip fracture plane activity difference characterization method and system, and the method comprises the steps: obtaining stratigraphic position interpretation through employing historical seismic data, and obtaining the fracture interpretation of a stratum through employing historical drilling data; acquiring stratigraphic position information of the to-be-analyzed section according to the seismic data of the to-be-analyzed section, and acquiring fault interpretation of the to-be-analyzed section according to the drilling data of the to-be-analyzed section; the stratigraphic position information of the to-be-analyzed section is compared with stratigraphic position interpretation obtained according to historical seismic data to obtain the fracture activity period of the to-be-analyzed stratum, or fault interpretation of the to-be-analyzed section is compared with fracture interpretation of the stratum obtained according to historical drilling data to obtain the fracture activity period of the to-be-analyzed stratum; according to the method, misjudgment, caused by subjectivity and experience of people, of the strike-slip fracture activity period can be greatly avoided, and data quantitative analysis under guidance of multiple methods is more beneficial to objective judgment of the strike-slip fracture activity period.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum exploration and development research, and is applicable to areas with deep burial depth and dense development of small-scale strike-slip faults, and in particular to a method and system for characterizing the differences in plane activity of multi-stage strike-slip faults. Background Art

[0002] Strike-slip faults are a common type of structure in the earth's crust. People began to understand strike-slip faults in the late 17th century. Because their activities are often accompanied by large-scale earthquake disasters, they have attracted the attention of geologists. With the rise of modern geological research, scientists have discovered a large number of strike-slip faults in mid-ocean ridges, plate boundaries, and inland areas. In recent years, with the continuous deepening of exploration, a large number of high-quality seismic data have been collected, providing a data basis for studying the activity periods of ultra-deep strike-slip faults in the continent (burial depth greater than 6,000 meters). However, due to the characteristics of ultra-deep strike-slip faults, such as large burial depth, long activity time span, and strong multi-stage activity transformation, the determination of the fault activity period has always been a difficult problem in research. The analysis of the differences in the activity of multi-stage strike-slip faults has mostly remained at the qualitative comparison stage, and there is little research on quantitative characterization methods.

[0003] Strike-slip fault: It is the abbreviation of strike-slip fault, which refers to a type of fault in which the two sides of the fault move relative to each other along the direction of the fault plane.

[0004] Seismic data: Different from natural earthquakes, it is a type of data used to obtain underground geological information by artificially stimulating and receiving seismic waves.

[0005] Rock Competence: A term used to describe the relative differences in the deformation behavior of rocks. Competent rocks are less likely to undergo viscous flow under the same deformation conditions than incompetent rocks. Strong materials are more rigid and viscous than weak materials, and are less likely to flow or break easily.

[0006] At present, the methods for identifying the active periods of strike-slip faults are:

[0007] 1. Determine the formation time of strike-slip faults by dividing the strata cut by strike-slip faults and analyzing the difference in paleo-stress (a method for determining the activity periods of small and medium-scale strike-slip faults in the basin). This method determines the developmental strata of the underlying upright strike-slip faults and the overlying en-echelon normal faults by clarifying the vertical stratification characteristics of the faults, and achieves the purpose of dividing the fault activity periods by analyzing the difference in paleo-stress environments corresponding to the activities of the underlying upright strike-slip faults and the overlying en-echelon normal faults. This method is suitable for determining multi-period strike-slip faults with obvious differences in spatial distribution and large changes in paleo-stress fields, but it is not possible to divide the periods and characterize the activity differences of faults with small differences in stress fields between the two periods.

[0008] 2. When strike-slip faults develop, associated structures are generated near the surface. The stages of fault activity are determined by analyzing the differences in the development of associated structures and the slip directions of strike-slip faults in different structural layers. For multi-stage small-slip strike-slip faults, when the strike-slip faults are active, unique associated structures will be formed in the near-surface strata. The stages of fault activity can be determined by determining the stratigraphic positions of the associated structures. In addition, the approximate time of fault activity can be determined by the offset and cutting of pre-existing geological bodies by strike-slip faults. This method is a qualitative analysis of the activity stages and lacks quantitative data as support. This method is proposed for the stage division of large-scale single strike-slip faults, and it is insufficient in the stage division and quantitative characterization of faults that cut each other and smaller-scale strike-slip faults. Summary of the invention

[0009] The purpose of the present invention is to provide a method and system for characterizing the difference in activity of a multi-period strike-slip fault plane, so as to overcome the deficiencies of the prior art.

[0010] A method for characterizing the difference in activity of multi-period strike-slip fault planes comprises the following steps:

[0011] Obtain stratigraphic interpretation based on historical seismic data, and obtain stratigraphic fracture interpretation based on historical drilling data;

[0012] Obtain seismic data and drilling data of the area to be analyzed, obtain stratigraphic information of the area to be analyzed based on the seismic data of the area to be analyzed, and obtain fault interpretation of the area to be analyzed based on the drilling data of the area to be analyzed; compare the stratigraphic information of the area to be analyzed with the stratigraphic interpretation obtained based on historical seismic data to obtain the fault activity period of the formation to be analyzed, or compare the fault interpretation of the area to be analyzed with the fault interpretation of the formation obtained based on historical drilling data to obtain the fault activity period of the formation to be analyzed; characterize the formation to be analyzed based on the obtained fault activity period.

[0013] Preferably, historical seismic data are obtained through seismic experiments, and the stratigraphic layers are analyzed and interpreted based on the historical seismic data to obtain stratigraphic layer interpretation data.

[0014] Preferably, drilling technology is used to conduct drilling experiments on the formation to obtain historical drilling data, and the fracture conditions of the formation are interpreted and analyzed based on the historical drilling data to obtain the fracture interpretation of the formation.

[0015] Preferably, when the stratum capabilities are consistent, if the stratum is a single set of flower-shaped structures, the fault activity period of the stratum is characterized by one period of strike-slip activity; if the stratum is two sets of flower-shaped structures superimposed vertically, the fault activity period of the stratum is characterized by two periods of strike-slip activity.

[0016] Preferably, using seismic data to obtain stratigraphic interpretation specifically includes:

[0017] From the perspective of terrain amplitude change, compare the differences in terrain amplitude change:

[0018] Under the condition that the rock capacities of the formations are similar, if the deformation amplitude of the formations cut through by the strike-slip fault is similar or changes gradually and continuously, and the positive deformation or negative deformation of the formations is consistent, then the fault activity period is characterized as a strike-slip activity.

[0019] If there is a large difference in the deformation amplitude of the strata penetrated by the strike-slip fault, and positive deformation and negative deformation coexist in the vertical direction, the fault activity period can be characterized as two-stage strike-slip activity.

[0020] From the perspective of vertical stacking of strata, the vertical stacking characteristics of strata are compared:

[0021] Under the condition that the rock capacities of the formations are similar, if the continuity of the strike-slip fault sections is good, the deformation amplitude of the formations is similar, and only one set of flower-shaped structures is developed, then the fault activity period is characterized by a single strike-slip activity;

[0022] If the deformation amplitude of the strike-slip fault section is inconsistent, there are differences in the number of branch faults, and two sets of flower-shaped structures are superimposed vertically, then the fault activity period can be characterized as two periods of strike-slip activity.

[0023] Preferably, if there are two phases of strike-slip activity, stratigraphic transformation occurs in the fault zone:

[0024] The early strike-slip faults were compressional and torsional in nature, while the late strike-slip activities were tensional and torsional in nature. The late activities transformed the faults formed in the early stage, causing the strata in the fault zone to present an "M" shape.

[0025] The early strike-slip faults were of tension-torsion nature, while the late strike-slip activities were of compression-torsion nature. The late activities transformed the faults formed in the early stage, causing the strata in the fault zone to present a "W" shape.

[0026] Preferably, the strata where the two phases of strike-slip activities developed are divided into an upper structural layer and a lower structural layer, and a coherent attribute map of seismic data is made at the top interface between the upper structural layer and the lower structural layer to characterize the planar distribution of the fault.

[0027] A multi-period strike-slip fault plane activity difference characterization system, including a pre-storage interpretation module and a characterization module:

[0028] A pre-storage interpretation module is used to store the stratigraphic interpretation obtained from historical seismic data and the fracture interpretation of the stratigraphic formation obtained from historical drilling data;

[0029] A characterization module inputs seismic data and drilling data of the section to be analyzed into the characterization module, and the characterization module obtains stratigraphic information of the section to be analyzed based on the seismic data of the section to be analyzed, and obtains fault interpretation of the section to be analyzed based on the drilling data of the section to be analyzed; the stratigraphic information of the section to be analyzed is compared with the stratigraphic interpretation obtained based on historical seismic data to obtain the fault activity period of the formation to be analyzed, or the fault interpretation of the section to be analyzed is compared with the fault interpretation of the formation obtained based on historical drilling data to obtain the fault activity period of the formation to be analyzed; the formation to be analyzed is characterized according to the obtained fault activity period.

[0030] A computer device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned method for characterizing the difference in activity of multi-period strike-slip fault planes when executing the computer program.

[0031] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the above-mentioned method for characterizing the differences in activity of multi-period strike-slip fault planes.

[0032] Compared with the prior art, the present invention has the following beneficial technical effects:

[0033] The present invention provides a method for characterizing the difference in plane activities of multiple strike-slip faults. The method uses historical seismic data to obtain a stratigraphic interpretation, and uses historical drilling data to obtain a fault interpretation of a stratum. The stratigraphic information of the section to be analyzed is obtained according to the seismic data of the section to be analyzed, and the fault interpretation of the section to be analyzed is obtained according to the drilling data of the section to be analyzed. The stratigraphic information of the section to be analyzed is compared with the stratigraphic interpretation obtained according to the historical seismic data to obtain the fault activity period of the stratum to be analyzed, or the fault interpretation of the section to be analyzed is compared with the fault interpretation of the stratum obtained according to the historical drilling data to obtain the fault activity period of the stratum to be analyzed. The stratum to be analyzed is characterized according to the obtained fault activity period. The present invention can greatly avoid the misjudgment of the strike-slip fault activity period caused by human subjectivity and experience, and the data quantitative analysis under the guidance of multiple methods is more conducive to objectively judging the strike-slip fault activity period.

[0034] Preferably, the present invention verifies the difference in fault activity through physical simulation experiments, performs physical simulation on strike-slip faults, sets up control test groups under various parameters, and analyzes the control factors causing the difference in strike-slip fault activity. The data used are all from seismic data, the amount of data read is small, and the methods involved are highly comparable. If there are multiple periods of strike-slip activity, there are large differences in the data, and comparative analysis is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1Schematic diagram of the process of the method for characterizing the difference in plane activity of multi-period strike-slip faults in an embodiment of the present invention.

[0036] Figure 2 This is a schematic diagram of the flower-shaped structure developed when the strike-slip fault is active in an embodiment of the present invention.

[0037] Figure 3 It is a schematic diagram of two sets of overlapping flower-shaped structures developed vertically in an embodiment of the present invention.

[0038] Figure 4 This is a comparison diagram of the single-phase activity and two-phase activity profiles of the strike-slip fault in the embodiment of the present invention.

[0039] Figure 5 It is a segmented trend diagram and a strike-slip fault trend rose diagram in the embodiment of the present invention.

[0040] Figure 6 4 is a comparison diagram of the fracture displacement in the embodiments of the present invention.

[0041] Figure 7 This is a schematic diagram of the experimental results of the control group of strike-slip fault dynamic direction differences in an embodiment of the present invention.

[0042] Figure 8 This is a schematic diagram of the experimental results of the control group of the difference in displacement of layered and staged strike-slip faults in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0045] The present invention provides a method for characterizing the difference in plane activity of multi-stage strike-slip faults. The method utilizes the difference in fault activity caused by multi-stage strike-slip motion to quantitatively characterize multiple groups of data, deepen the characterization of multi-stage faults, and also provide a quantitative judgment method for exploring the staged activities of faults in similar areas. The method specifically includes the following steps:

[0046] Based on seismic data, the structural division of the stratigraphic faults of strike-slip faults and the characterization of fault activity are carried out;

[0047] Collect drilling data of the formation to be analyzed, obtain the fault characteristics of the formation to be analyzed based on the drilling data of the formation to be analyzed, compare the fault characteristics of the formation to be analyzed with the fault characteristics characterized by the fault activity period, and if the fault characteristics of the formation to be analyzed meet the requirements of the first-stage strike-slip fault activity after comparison with the fault characteristics characterized by the fault activity period,

[0048] S1, obtain the stratigraphic interpretation based on historical seismic data, and obtain the stratigraphic fault interpretation based on historical drilling data;

[0049] Historical seismic data are obtained through seismic experiments, that is, data of underground geological information is obtained through artificial stimulation and reception of seismic waves; based on historical seismic data, the stratigraphic layers are analyzed and interpreted to obtain stratigraphic layer interpretation data; at the same time, drilling experiments are carried out on the strata using drilling technology to obtain historical drilling data, and the fracture conditions of the strata are interpreted and analyzed through the historical drilling data to obtain the fracture interpretation of the strata, such as Figure 2 As shown, when the strike-slip fault is active, flower-shaped structures develop.

[0050] S2, obtaining seismic data and drilling data of the section to be analyzed, obtaining stratigraphic information of the section to be analyzed based on the seismic data of the section to be analyzed, and obtaining fault interpretation of the section to be analyzed based on the drilling data of the section to be analyzed; comparing the stratigraphic information of the section to be analyzed with the stratigraphic interpretation obtained based on historical seismic data to obtain the fault activity period of the formation to be analyzed, or comparing the fault interpretation of the section to be analyzed with the fault interpretation of the formation obtained based on historical drilling data to obtain the fault activity period of the formation to be analyzed; characterizing the formation to be analyzed based on the obtained fault activity period.

[0051] The fault interpretation of the stratum is obtained based on the historical drilling data. After analyzing the historical drilling data, under the condition that the stratum capability is consistent, if the stratum is a single set of flower-shaped structures, the fault activity period of the stratum is characterized by one period of strike-slip activity; if the stratum is two sets of flower-shaped structures superimposed vertically, the fault activity period of the stratum is characterized by two periods of strike-slip activity.

[0052] When strike-slip movement occurs, many branch faults will develop in the strata near the surface, and the branch faults show the characteristics of converging to the main fault from shallow to deep. As the ground settles and sediments accumulate, the ancient surface is buried deep underground, and the branch faults generated on the ancient surface are well preserved. Under the condition of consistent stratum capability, if it is a single-stage strike-slip activity, a set of flower-shaped structures will develop; if it is a two-stage strike-slip activity, such as Figure 3 As shown, two sets of superimposed flower-like structures developed vertically.

[0053] In one embodiment of the present application, the stratigraphic interpretation is obtained using seismic data, that is, the stratigraphic interpretation is obtained by characterizing the stratigraphic layers through seismic profile analysis of the seismic data.

[0054] The interpretation of stratigraphic positions obtained using seismic data is analyzed from two aspects, including:

[0055] 1. Compare the differences in terrain amplitude changes from the perspective of terrain amplitude changes:

[0056] Under the condition that the rock capacities of the formations are similar, if the deformation amplitude of the formations cut through by the strike-slip fault is similar (the deformation amplitude of the formation is less than 5%) or changes gradually and continuously, and the positive deformation or negative deformation of the formations is consistent, then the fault activity period is characterized as a strike-slip activity.

[0057] If there is a large difference in the deformation amplitude of the strata cut through by the strike-slip fault (the deformation amplitude of the strata is greater than or equal to 5%), and positive deformation and negative deformation coexist in the vertical direction, the fault activity period is characterized by two periods of strike-slip activity.

[0058] 2. From the perspective of vertical stacking of strata, compare the vertical stacking characteristics of strata:

[0059] When the rock capacities of the formations are similar, if the continuity of the strike-slip fault section is good, the deformation amplitude of the formations is similar (the deformation amplitude of the formations is less than 5%), and only one set of flower-shaped structures is developed, then the fault activity period is characterized by a single-stage strike-slip activity.

[0060] If the deformation amplitude of the strike-slip fault section is inconsistent (the deformation amplitude of the formation is greater than or equal to 5%), there are differences in the number of branch faults, and two sets of flower-shaped structures are superimposed vertically, then the fault activity period is characterized by two periods of strike-slip activity.

[0061] From the perspective of the characteristics of strata being transformed by fault activities, if there are two phases of strike-slip activities, strata transformation occurs in the fault zone, which can be divided into two specific situations:

[0062] The early strike-slip faults were compressional and torsional in nature, while the late strike-slip activities were tensional and torsional in nature. The late activities transformed the faults formed in the early stage, causing the strata in the fault zone to present an "M" shape.

[0063] The early strike-slip faults were of tension-torsion nature, while the late strike-slip activities were of compression-torsion nature. The late activities transformed the faults formed in the early stage, causing the strata in the fault zone to present a "W" shape. Figure 4 shown.

[0064] Example

[0065] In one embodiment of the present application, the difference in activity between two phases of strike-slip fault planes is quantitatively characterized and analyzed:

[0066] The strata to be analyzed are characterized according to the acquired fault activity periods: two periods of strike-slip activity are determined by the above method, and according to the layers where the two periods of strike-slip activity develop, they are divided into the upper structural layer (the layer where the late strike-slip fault develops) and the lower structural layer (the layer where the early strike-slip fault develops). A seismic data coherence attribute map is made at the top interface of the upper structural layer and the lower structural layer to characterize the plane distribution of the fault.

[0067] Analysis of the difference in strike-slip fault orientation between the two phases:

[0068] The power sources of strike-slip activities in different periods are different, which leads to the differences in the strike-slip faults formed in different periods. Based on this, the difference between the two periods of strike-slip activities is analyzed by statistically analyzing the strike-slip fault strike data. According to the division of the strike-slip fault activity periods, the stratigraphic layer where the early strike-slip faults developed is called the lower structural layer, and the layer where the late strike-slip faults developed is called the upper structural layer. Seismic data coherent attribute maps are made for the top interfaces of the two sets of structural layers, and the faults are interpreted on the plane. When counting, the strike-slip faults explained in the two sets of attribute maps are divided into equal segments, the fault strikes in each segment are measured, and then the fault segment strike map is made to analyze the differences between the two sets of measured data.

[0069] The data statistics and analysis process are as follows:

[0070] ① Divide the strike-slip fault with a total length of m into n sections every 5 km.

[0071] n=m / 5 (1)

[0072] ② Draw a line segment in each segment as the fitting line segment of the strike-slip fault direction in the segment, and require that the two endpoints of the line segment coincide with the two endpoints of the strike-slip fault in the segment.

[0073] ③Measure the direction of the fitted line segment (the angle with the geographic north direction).

[0074] ④ Make a statistical table of the measured data;

[0075] ⑤Calculate the average trend based on the measured data.

[0076] Average trend calculation formula:

[0077]

[0078] α: average strike-slip fault direction; i: read numerical number; n: number of segments divided by the fault; θ: strike-slip fault direction of each segment.

[0079] Correspondingly, the strike-slip fault segment trend data at the top interface of the upper and lower structural layers are read respectively (the position of the segment is kept unchanged when reading the two sets of data).

[0080] Record the average trend value of the two sets of data.

[0081] The two sets of data were used to produce rose diagrams of fault trend (a type of map used to determine the direction of tectonic stress by mapping fault trend data in geological research). The two rose diagrams were then integrated into the same base map to compare and analyze the angle between the two sets of dominant trends.

[0082] Method for drawing a strike-slip fault rose diagram:

[0083] a. Sort the measured data in order of size;

[0084] b. The entire azimuth (0°—±180°) is divided into 120 groups at an interval of 3°.

[0085] For example: 0°—2.9°, 3°—5.9°.

[0086] c. Count the number of data that fall into each group. For example, the number of data that fall into the 0°-2.9° group is 3.

[0087] d, calculate the mean value β of the data assigned to each group

[0088] Average trend calculation formula:

[0089] Among them, r i Indicates the data that fall into this group;

[0090] t represents the amount of data that falls into this group.

[0091] e. Fill in the statistically organized values ​​into the table, as shown in Table 1, Table 2 and Table 3.

[0092] f, make a scale and complete the map. Finally, according to the segmented trend map and the strike-slip fault trend rose map, Figure 5 shown.

[0093] Table 1 Statistics of fault segment trend

[0094]

[0095] Table 2 Statistics of rose diagrams of segmented strike at the top interface of the lower structural layer

[0096]

[0097]

[0098] Table 3 Statistics of rose diagrams of segmented strike at the top interface of the upper structural layer

[0099]

[0100] Displacement comparison:

[0101] If there are special geological bodies (such as volcanic intrusive rocks and bioherms) near the top interface of the upper and lower tectonic layers or obvious seismic reflection phase axes are dislocated by strike-slip faults, the dislocation displacement S of each layer of the two tectonic layers is measured, and the dislocation displacement of the lower stratum is recorded as S1, and the dislocation displacement of the upper stratum is recorded as S2; if it is two periods of strike-slip activity, the relative change rate D of the displacement is large (greater than or equal to 10%); if it is the same period of strike-slip activity, the relative change rate D of the displacement is small (less than 10%).

[0102] Seismic reflection event axis misalignment measurement steps:

[0103] ① Select the time slice in the structural layer above the stage interface where the event axis is obviously dislocated by the fracture (i.e., the isochronous slice of the seismic data body made at a certain time). Similarly, select the seismic reflection plane below the stage interface.

[0104] ②Measure the displacement S of the strike-slip fault in two planes. The displacement of the lower stratum is recorded as S1, and the displacement of the upper stratum is recorded as S2. Figure 6 As shown:

[0105] ③ Calculate the relative change rate D of the displacement of the strata above and below the interface:

[0106] D=|(S2-S1) / S1| (4)

[0107] The measurement and analysis of strike-slip faults and faulted special geological bodies, such as volcanic intrusive rocks and bioherms, are similar to those of faulted seismic reflection events.

[0108] The present invention verifies the difference in fault activity through physical simulation experiments, performs physical simulation on strike-slip faults, and sets control test groups under various parameters. The results are as follows: Figure 7 and Figure 8As shown, the control factors that cause the difference in strike-slip fault activity are analyzed. The data used are all from seismic data, the amount of data read is small, and the methods involved are highly comparable. If there are multiple periods of strike-slip activity, there are large differences in the data, and the comparative analysis is simple. The present invention can greatly avoid the misjudgment of the strike-slip fault activity period due to human subjectivity and experience. The quantitative analysis of data under the guidance of multiple methods is more conducive to objectively judging the strike-slip fault activity period.

[0109] In one embodiment of the present invention, a multi-period strike-slip fault plane activity difference characterization system is provided, including a pre-storage interpretation module and a characterization module:

[0110] A pre-storage interpretation module is used to store the stratigraphic interpretation obtained from historical seismic data and the fracture interpretation of the stratigraphic formation obtained from historical drilling data;

[0111] A characterization module inputs seismic data and drilling data of the section to be analyzed into the characterization module, and the characterization module obtains stratigraphic information of the section to be analyzed based on the seismic data of the section to be analyzed, and obtains fault interpretation of the section to be analyzed based on the drilling data of the section to be analyzed; the stratigraphic information of the section to be analyzed is compared with the stratigraphic interpretation obtained based on historical seismic data to obtain the fault activity period of the formation to be analyzed, or the fault interpretation of the section to be analyzed is compared with the fault interpretation of the formation obtained based on historical drilling data to obtain the fault activity period of the formation to be analyzed; the formation to be analyzed is characterized according to the obtained fault activity period.

[0112] In another embodiment of the present invention, a terminal device is provided, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions to implement the corresponding method flow or corresponding function; the processor described in the embodiment of the present invention can be used for the operation of a multi-period strike-slip fault plane activity difference characterization method, including the following steps: obtaining a stratigraphic interpretation based on historical seismic data, and obtaining a stratigraphic fracture interpretation based on historical drilling data;

[0113] Obtain seismic data and drilling data of the area to be analyzed, obtain stratigraphic information of the area to be analyzed based on the seismic data of the area to be analyzed, and obtain fault interpretation of the area to be analyzed based on the drilling data of the area to be analyzed; compare the stratigraphic information of the area to be analyzed with the stratigraphic interpretation obtained based on historical seismic data to obtain the fault activity period of the formation to be analyzed, or compare the fault interpretation of the area to be analyzed with the fault interpretation of the formation obtained based on historical drilling data to obtain the fault activity period of the formation to be analyzed; characterize the formation to be analyzed based on the obtained fault activity period.

[0114] In another embodiment of the present invention, the present invention further provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a terminal device for storing programs and data. It can be understood that the computer-readable storage medium here can include both the built-in storage medium in the terminal device and the extended storage medium supported by the terminal device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory, or a non-volatile memory (non-volatile memory), such as at least one disk storage.

[0115] The processor may load and execute one or more instructions stored in the computer-readable storage medium to implement the corresponding steps of the method for characterizing the difference in activity of multi-period strike-slip fault planes in the above-mentioned embodiment; the processor may load and execute the following steps: obtaining a stratigraphic interpretation based on historical seismic data, and obtaining a stratigraphic fault interpretation based on historical drilling data;

[0116] Obtain seismic data and drilling data of the area to be analyzed, obtain stratigraphic information of the area to be analyzed based on the seismic data of the area to be analyzed, and obtain fault interpretation of the area to be analyzed based on the drilling data of the area to be analyzed; compare the stratigraphic information of the area to be analyzed with the stratigraphic interpretation obtained based on historical seismic data to obtain the fault activity period of the formation to be analyzed, or compare the fault interpretation of the area to be analyzed with the fault interpretation of the formation obtained based on historical drilling data to obtain the fault activity period of the formation to be analyzed; characterize the formation to be analyzed based on the obtained fault activity period.

[0117] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0118] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes 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.

[0119] 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.

[0120] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for characterizing the difference in activity of multi-period strike-slip fault planes, characterized in that: The following steps are involved: Obtain stratigraphic interpretation based on historical seismic data, and obtain stratigraphic fracture interpretation based on historical drilling data; Obtain seismic data and drilling data of the area to be analyzed, obtain stratigraphic information of the area to be analyzed based on the seismic data of the area to be analyzed, and obtain fault interpretation of the area to be analyzed based on the drilling data of the area to be analyzed; compare the stratigraphic information of the area to be analyzed with the stratigraphic interpretation obtained based on historical seismic data to obtain the fault activity period of the formation to be analyzed, or compare the fault interpretation of the area to be analyzed with the fault interpretation of the formation obtained based on historical drilling data to obtain the fault activity period of the formation to be analyzed; characterize the formation to be analyzed based on the obtained fault activity period.

2. A method for characterizing differences in multi-period strike-slip fault plane activity according to claim 1, characterized in that: Historical seismic data are obtained through seismic experiments, and based on the historical seismic data, the stratigraphic layers are analyzed and interpreted to obtain stratigraphic layer interpretation data.

3. A method for characterizing differences in multi-period strike-slip fault plane activity according to claim 1, characterized in that: The drilling technology is used to conduct drilling experiments on the formation to obtain historical drilling data, and the fracture conditions of the formation are interpreted and analyzed through the historical drilling data to obtain the fracture interpretation of the formation.

4. A method for characterizing differences in multi-period strike-slip fault plane activity according to claim 1, characterized in that: When the strata have consistent capabilities, if the strata are a single set of flower-shaped structures, the fault activity period of the strata is characterized by one period of strike-slip activity; if the strata are two sets of flower-shaped structures superimposed vertically, the fault activity period of the strata is characterized by two periods of strike-slip activity.

5. The method for characterizing the difference in activity of a multi-period strike-slip fault plane according to claim 1, characterized in that: Use seismic data to obtain stratigraphic interpretation, including: From the perspective of terrain amplitude change, compare the differences in terrain amplitude change: Under the condition that the rock capacities of the formations are similar, if the deformation amplitude of the formations cut through by the strike-slip fault is similar or changes gradually and continuously, and the positive deformation or negative deformation of the formations is consistent, then the fault activity period is characterized as a strike-slip activity. If there is a large difference in the deformation amplitude of the strata cut through by the strike-slip fault, and positive deformation and negative deformation coexist vertically, the fault activity period is characterized by two periods of strike-slip activity; From the perspective of vertical stacking of strata, the vertical stacking characteristics of strata are compared: Under the condition that the rock capacities of the formations are similar, if the continuity of the strike-slip fault sections is good, the deformation amplitude of the formations is similar, and only one set of flower-shaped structures is developed, then the fault activity period is characterized by a single strike-slip activity; If the deformation amplitude of the strike-slip fault section is inconsistent, there are differences in the number of branch faults, and two sets of flower-shaped structures are superimposed vertically, then the fault activity period can be characterized as two periods of strike-slip activity.

6. A method for characterizing differences in multi-period strike-slip fault plane activity according to claim 1, characterized in that: If it is a two-stage strike-slip activity, there will be stratigraphic transformation in the fault zone: The early strike-slip faults were compressional and torsional in nature, while the late strike-slip activities were tensional and torsional in nature. The late activities transformed the faults formed in the early stage, causing the strata in the fault zone to present an "M" shape. The early strike-slip faults were of tension-torsion nature, while the late strike-slip activities were of compression-torsion nature. The late activities transformed the faults formed in the early stage, causing the strata within the fault zone to present a "W" shape.

7. A method for characterizing differences in multi-period strike-slip fault plane activity according to claim 6, characterized in that: According to the strata where the two phases of strike-slip activities developed, they were divided into upper structural layers and lower structural layers, and a coherent attribute map of seismic data was made at the top interface between the upper structural layer and the lower structural layer to characterize the planar distribution of the fault.

8. A multi-period strike-slip fault plane activity difference characterization system, characterized in that: Includes pre-storage interpretation module and representation module: A pre-storage interpretation module is used to store the stratigraphic interpretation obtained from historical seismic data and the fracture interpretation of the stratigraphic formation obtained from historical drilling data; A characterization module inputs seismic data and drilling data of the section to be analyzed into the characterization module, and the characterization module obtains stratigraphic information of the section to be analyzed based on the seismic data of the section to be analyzed, and obtains fault interpretation of the section to be analyzed based on the drilling data of the section to be analyzed; the stratigraphic information of the section to be analyzed is compared with the stratigraphic interpretation obtained based on historical seismic data to obtain the fault activity period of the formation to be analyzed, or the fault interpretation of the section to be analyzed is compared with the fault interpretation of the formation obtained based on historical drilling data to obtain the fault activity period of the formation to be analyzed; the formation to be analyzed is characterized according to the obtained fault activity period.

9. A computer 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 computer program, the steps of the method for characterizing the difference in activity of multi-period strike-slip fault planes as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method for characterizing the difference in activity of a multi-period strike-slip fault plane as claimed in any one of claims 1 to 7 are implemented.

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