Comprehensive evaluation method for strike-slip fracture of ultra-deep carbonatite

Abstract

The invention belongs to the technical field of carbonate rock oil and gas exploration and development, and particularly relates to a method for evaluating strike-slip fracture of ultra-deep carbonate rock. According to the method, data such as whether the strike-slip fracture is broken downwards to a Hanwu unified gypsum-salt layer in the Shiwu system, the penetration degree of the fracture from the Shiwu system to a target layer, the reservoir forming period of the fracture and matching evaluation of the active period are obtained, and the strike-slip fracture is segmented and classified through the data, so that a favorable oil and gas enrichment area can be predicted, and then well location deployment and drilling operation are guided. Favorable target optimization can be carried out on the developed carbonate rock oil and gas reservoir strike-slip fault zone, and the drilling success rate is effectively increased. The innovative evaluation method and thought have a good application effect and popularization prospect on the same fault control carbonate rock area or similar areas needing oil source fracture analysis.

Description

Technical Field

[0001] This invention belongs to the field of carbonate rock oil and gas exploration and development technology, specifically relating to an evaluation method for strike-slip faults in ultra-deep carbonate rocks. Background Technology

[0002] The Ordovician marine carbonate rocks are rich in oil and gas resources, but the geological conditions and distribution of oil and gas reservoirs are complex, the production of oil and gas is extremely unstable, and the development is extremely difficult. In recent years, through research and practice on oil and gas reservoir evaluation and development, it has been found that strike-slip faults are not only favorable locations for the development of fracture-vuggy reservoirs, but also the main channels for the vertical migration of oil and gas in multiple phases, and play an important role in controlling the accumulation, distribution and adjustment of oil and gas.

[0003] Strike-slip fault zones not only control fracture-vuggy reservoirs but also differentiated hydrocarbon accumulation. Influenced by variations in fault strike and segmentation patterns, different strike-slip fault zones, as well as different segments of the same strike-slip fault, exhibit significant differences in hydrocarbon enrichment characteristics. Therefore, strike-slip faults are a key focus and challenge in the study of ultra-deep carbonate reservoirs. Due to the influence of multiple tectonic movements, strike-slip faults have complex structures and are also subject to karst alteration, making identification and evaluation of strike-slip faults exceptionally difficult, thus hindering the efficient evaluation and development of Ordovician marine carbonate reservoirs. While existing technologies have conducted extensive research on the deformation characteristics, formation mechanisms, reservoir-controlling effects, and exploration significance of strike-slip fault zones, a systematic evaluation technology framework for strike-slip faults has not yet been established. Therefore, conducting a deeper, more systematic evaluation of strike-slip fault zones, summarizing the reservoir-controlling patterns of strike-slip faults, and selecting the optimal hydrocarbon-enriching segments are urgent tasks for the efficient development of carbonate reservoirs. Summary of the Invention

[0004] The purpose of this invention is to provide a comprehensive evaluation method for strike-slip faults in ultra-deep carbonate rocks, which solves the problem that there is no systematic comprehensive evaluation of strike-slip faults, the most important controlling factor in fault-controlled oil and gas reservoirs.

[0005] This invention is achieved through the following technical solution:

[0006] A comprehensive evaluation method for strike-slip faults in ultra-deep carbonate rocks includes the following steps:

[0007] Using seismic data and seismic interpretation horizons, we will identify and characterize strike-slip faults, and compile seismic attribute maps and fault outline maps for each layer.

[0008] Each layer includes the layer from the top surface of the target layer to the bottom surface of the Cambrian system;

[0009] Using the seismic attribute maps and fault outline maps of each layer, it is determined whether the strike-slip fault is a continuous fault, and a fault source evaluation map is obtained; when the strike-slip fault is a continuous fault, a conduction evaluation is performed.

[0010] Based on the seismic attribute maps and fault outline maps of each stratum, the activity intensity and longitudinal connectivity of strike-slip faults are obtained; based on the activity intensity, longitudinal connectivity and stress state of the Middle Cambrian gypsum rock, the conductivity of strike-slip faults is evaluated, and a fault conductivity evaluation map is obtained.

[0011] The active periods of strike-slip faults are obtained based on the fault outline map; the matching relationship between the active periods of strike-slip faults and the main hydrocarbon accumulation periods is analyzed, the matching of strike-slip faults is evaluated, and the fault matching evaluation map is obtained.

[0012] Based on the fracture source evaluation map, fracture conductivity evaluation map, and fracture matching evaluation map, a comprehensive evaluation of the three properties of strike-slip fractures is carried out, and a comprehensive evaluation map of the three properties of strike-slip fractures is compiled to provide a basis for deploying development wells along strike-slip fractures.

[0013] Furthermore, the process of identifying and characterizing strike-slip faults using seismic data and seismic interpretation horizons, and compiling seismic attribute maps and fault outline maps for each layer, specifically includes the following steps:

[0014] 1.1. Using the depth domain three-dimensional seismic data volume, extract the seismic attribute data volume that can characterize the distribution characteristics of strike-slip faults and carry out seismic horizon interpretation to obtain the horizon data of each layer.

[0015] The stratigraphic data for each stratum mainly includes the stratigraphic data for the top surface of the Yijianfang Formation of the Ordovician, the bottom surface of the Ordovician, the bottom surface of the Upper Cambrian, and the bottom surface of the Lower Cambrian;

[0016] 1.2. Extract seismic attribute maps that reflect the fault distribution characteristics of each layer using the stratigraphic data of each layer, and select sensitive attributes to guide the interpretation of fault planes;

[0017] 1.3 Combine the seismic attribute map obtained in step 1.2 with the depth domain 3D seismic data volume to perform three-dimensional fault interpretation;

[0018] 1.4 Combining the seismic attribute map obtained in 1.2 and the fault interpretation results obtained in 1.3, a fault outline map of the main stratigraphic layers is obtained.

[0019] Furthermore, in section 1.1, earthquake attributes include coherence, maximum likelihood, structural tensor, and amplitude gradient.

[0020] Furthermore, in section 1.4, the main stratigraphic fault outlines include the fault outlines of the top surface of the Ordovician Yijianfang Formation, the bottom surface of the Ordovician, the bottom surface of the Upper Cambrian, and the bottom surface of the Lower Cambrian.

[0021] Furthermore, by using the seismic attribute maps and fault outline maps of each layer, it is determined whether the strike-slip fault is a continuous fault, and a fault source evaluation map is obtained. This specifically includes the following steps:

[0022] 2.1 Overlay the seismic attribute maps and fault outline maps of each stratum. If a fault is developed on several vertical stratigraphic attribute maps, it indicates that it ruptures the Lower Cambrian strata and is judged as a through-source fault; if a fault does not rupture the Lower Cambrian strata, it is judged as a non-through-source fault.

[0023] 2.2 After integrating the fractures with and without sources, a fracture source evaluation diagram is obtained.

[0024] Furthermore, the process of obtaining the fracture conductivity evaluation map specifically includes the following steps:

[0025] 3.1 Obtain the activity intensity and longitudinal connectivity of strike-slip faults from the seismic attribute maps and fault outline maps of each layer. The stronger the activity intensity of the strike-slip fault and the more upright the longitudinal connectivity, the better the longitudinal conductivity.

[0026] 3.2 Vertical channeling of oil and gas requires overcoming the blockage of the Middle Cambrian gypsum rock, and it is necessary to predict the stress state of the Middle Cambrian gypsum rock;

[0027] 3.3 Taking into account the intensity of strike-slip fault activity, the degree of longitudinal connectivity, and the stress state of the Middle Cambrian gypsum rock, a longitudinal conductivity evaluation of the strike-slip fault was completed, and a fault conductivity evaluation map was obtained.

[0028] Furthermore, in section 3.2, the specific method for predicting the stress state of the Middle Cambrian gypsum rock is as follows:

[0029] Using the stratigraphic data of the Upper Cambrian bottom obtained in step 1.1, smoothing and calculation were performed to obtain the trend surface map of the Middle Cambrian gypsum-salt rock top surface;

[0030] If the strike-slip fault is a negative landform on the trend map of the top surface of the Middle Cambrian gypsum-salt rock, it indicates that the strike-slip fault is under tensile stress and has good conductivity; if the strike-slip fault is a positive landform on the trend map of the top surface of the Middle Cambrian gypsum-salt rock, it indicates that the strike-slip fault is under compressive stress and has poor conductivity.

[0031] Furthermore, the process of obtaining the fracture matching evaluation map specifically includes the following steps:

[0032] 4.1. Based on the outline diagram of strike-slip faults in each layer, the active phases of the strike-slip faults are obtained;

[0033] 4.2 Analyze the spatiotemporal matching relationship between the active periods of strike-slip faults and the main hydrocarbon accumulation periods to obtain a fault matching evaluation map.

[0034] Furthermore, in section 4.2, the main hydrocarbon accumulation periods include the Late Caledonian, Late Hercynian, and Himalayan periods.

[0035] Furthermore, based on the comprehensive evaluation map of strike-slip fractures, the distribution characteristics of fractures rated as Class I and Class II were obtained, providing basic data for the selection of favorable targets and well location deployment.

[0036] Compared with the prior art, the present invention has the following beneficial technical effects:

[0037] This invention provides a method for evaluating the three properties of strike-slip fractures. By studying the source, conductivity, and matching of strike-slip fractures, it obtains data such as whether the strike-slip fracture extends down to the Cambrian Middle Cambrian gypsum-salt layer, the degree of penetration of the fracture from the Cambrian to the target layer, and the matching evaluation of the fracture's reservoir formation and activity periods. This data is used to segment and classify strike-slip fractures, thereby predicting favorable oil and gas enrichment areas and guiding well location deployment and drilling operations. It enables the selection of favorable targets in strike-slip fracture zones of already developed carbonate oil and gas reservoirs, effectively improving drilling success rates. The innovative evaluation method and approach of this invention have excellent application effects and promising prospects for similar fault-controlled carbonate rock areas or areas requiring oil-source fracture analysis. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the three-dimensional interpretation process of strike-slip fracture according to an embodiment of the present invention;

[0039] Figure 2 This is a flowchart illustrating a strike-slip fracture three-property evaluation method according to an embodiment of the present invention;

[0040] Figure 3 This is a fracture outline diagram of the top surface of the target layer;

[0041] Figure 4a A coherent diagram of a room group in the Ordovician system;

[0042] Figure 4b Coherence diagram of the upper Cambrian surface of the Ordovician system;

[0043] Figure 4c This is a diagram for evaluating the source of strike-slip fractures.

[0044] Figure 5a For F Ⅰ 7. Coherence diagram of the Cambrian basal layer along the fault zone;

[0045] Figure 5b For F Ⅰ 7. Coherence diagram of the Penglaiba Formation base of the fault zone;

[0046] Figure 5c For F Ⅰ 7. Coherence diagram of a rooftop along a fault zone;

[0047] Figure 5d This is a seismic profile along the vertical fault direction of well RP7-H2;

[0048] Figure 5e A diagram for evaluating the conductivity of a strike-slip fracture;

[0049] Figure 6 This is a comprehensive evaluation diagram of the three properties of a strike-slip fracture. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the present invention clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention; that is, the described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0051] The components described and illustrated in the accompanying drawings and embodiments of this invention can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely to illustrate one selected embodiment of the invention. All other embodiments obtained by those skilled in the art based on the accompanying drawings and embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0052] It should be noted that the terms “comprising,” “including,” or any other variations are intended to cover non-exclusive inclusion, such that a process, element, 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 the process, element, method, article, or apparatus.

[0053] like Figure 2 As shown, the present invention proposes a comprehensive evaluation method for ultra-deep carbonate rock strike-slip faults, which includes the following steps:

[0054] Step 1: Using seismic data and interpreted horizons, identify and characterize strike-slip faults, and compile outline maps of strike-slip faults in each layer.

[0055] like Figure 1 As shown, the specific steps include the following:

[0056] 1.1. Use depth-domain 3D seismic data volumes to extract seismic attribute data volumes of each layer that can characterize the distribution characteristics of strike-slip faults and conduct seismic horizon interpretation.

[0057] The seismic attribute data volume includes data such as coherence, maximum likelihood, structural tensor, and amplitude gradient.

[0058] Among them, the main stratigraphic positions of each system include the top surface of the Ordovician Yijianfang Formation, the bottom surface of the Ordovician, the bottom surface of the Upper Cambrian, and the bottom surface of the Lower Cambrian;

[0059] 1.2. Extract seismic attribute maps that reflect the fault distribution characteristics of each layer using the stratigraphic data of each layer, and select sensitive attributes to guide the interpretation of fault planes;

[0060] 1.3 Combine the seismic attribute map obtained in step 1.2 with the depth domain 3D seismic data volume to perform three-dimensional fault interpretation;

[0061] 1.4 Combining the seismic attribute map obtained in 1.2 and the fault interpretation results obtained in 1.3, a fault outline map of the main stratigraphic layers is obtained.

[0062] Step 2: Evaluation of the source of strike-slip fractures

[0063] 2.1 Overlay the seismic attribute maps and fault outline maps of the main stratigraphic layers. If a fault is developed in several vertical stratigraphic attribute maps, it indicates that it breaks through the Lower Cambrian strata (the source rocks are within the Lower Cambrian), and is judged as a through-source fault. If a fault does not break through the Lower Cambrian strata, it is judged as a non-through-source fault.

[0064] 2.2. The strike-slip fractures are divided into two categories: those with continuous sources and those without, and the source evaluation diagram of strike-slip fractures is obtained.

[0065] Step 3: Evaluation of the conductivity of strike-slip fractures

[0066] 3.1 Based on the source fracture obtained in step two, conduct a conductivity evaluation. The stronger the source fracture activity (clear on the coherence diagram) and the more vertical the longitudinal direction (good overlap of the fracture outline diagrams of each layer), the better the longitudinal conductivity.

[0067] 3.2 Vertical oil and gas channeling requires overcoming the blockage of the Middle Cambrian gypsum rock. This necessitates understanding the stress state of the Middle Cambrian gypsum rock. Using the stratigraphic data of the Upper Cambrian bottom surface (top of the Middle Cambrian gypsum rock) obtained in step 1.1, smoothing and calculations are performed to obtain a trend surface map of the Middle Cambrian gypsum-salt rock top surface. If the strike-slip fault is a positive topography on the trend surface map, it indicates that the fault is under compressive stress, and the strike-slip fault has poor channeling capacity; conversely, it indicates good channeling capacity.

[0068] 3.3. Taking into account the intensity of activity, the degree of longitudinal connectivity, and the stress state of the Middle Cambrian gypsum rock, complete the evaluation of the longitudinal conductivity of the strike-slip fault.

[0069] Step four specifically includes the following steps:

[0070] Step 4: Matching evaluation of strike-slip fracture

[0071] 4.1. Based on the strike-slip fault outline diagrams of each layer obtained in step one, analyze the active phases of the strike-slip faults;

[0072] 4.2 Analyze the spatiotemporal matching relationship between the active periods of strike-slip faults and the main hydrocarbon accumulation periods (late Caledonian, late Hercynian, and Himalayan) to obtain a fault matching evaluation map.

[0073] Step 5: Comprehensive evaluation of strike-slip fracture properties

[0074] 5.1. Based on the results of steps two, three, and four, a comprehensive evaluation of the three properties of strike-slip fractures is conducted, and a comprehensive evaluation map of the three properties of strike-slip fractures is compiled. The distribution characteristics of fractures evaluated as Class I and Class II are obtained, providing basic data for the selection of favorable targets and well location deployment.

[0075] The features and performance of the present invention will be further described in detail below with reference to embodiments in the Halahatang area of ​​the Tarim Basin.

[0076] This invention addresses a well in the Halahatang oilfield, where the fault extends to the Yijianfang Formation of the Ordovician system. It employs a process for evaluating ultra-deep carbonate strike-slip faults, comprising the following steps:

[0077] Step 1: Compile outline diagrams of strike-slip faults in each layer.

[0078] This step follows the standard interpretation procedure and method for strike-slip fractures, ultimately yielding fracture outline maps for each layer, particularly the fracture outline map of the top surface of the target layer. (See attached image.) Figure 3 .

[0079] Step 2: Evaluation of the source of strike-slip fractures

[0080] This step evaluates whether a strike-slip fault has reached the source rock. Faults that have reached the source rock should be classified according to their activity intensity and longitudinal connectivity. Type I faults have the best source rock connectivity, and Type II faults are the next best. Figure 4a This is a coherence diagram of the top surface of the Ordovician One Room Formation in the target layer. Figure 4b The coherence diagrams for the upper Cambrian basal layer show that the strike-slip fault is reflected in both layers, indicating that the fault extends to the Middle Cambrian source rocks. A source rock evaluation diagram for the target layer fault is obtained (see...). Figure 4c ), Figure 4c The red areas represent fractures with good origin, while the green areas represent fractures with poor origin.

[0081] Step 3: Evaluation of the conductivity of strike-slip fractures

[0082] This step evaluates the longitudinal connectivity of strike-slip faults and their role in sealing against Middle Cambrian gypsum-salt rock layers. Faults with good longitudinal connectivity and tensile stress at the top of the gypsum-salt rock layer are considered favorable for hydrocarbon transport and are rated as Class I (Figure 5). Figure 5a , Figure 5b , Figure 5cThe images are coherence plane diagrams of the Upper Cambrian bottom, the Ordovician bottom, and the top of the Ordovician Yijianfang Formation, respectively. If the faults are clearly developed and have large widths on these three coherence diagrams, it indicates that the fault activity is strong; otherwise, the activity is weak. Figure 5d The characteristics of the fault on the seismic profile are used to determine the degree of its verticality. Figure 5 shows a seismic profile of a strike-slip fault, reflecting the longitudinal connectivity of the fault. A conductivity evaluation map is obtained (…). Figure 5e In the diagram, red type I represents the fracture with the best conductivity, green type II is slightly worse, and blue type III is the worst.

[0083] Step 4: Matching evaluation of strike-slip fracture

[0084] This step mainly analyzes the matching relationship between the active periods of faults and the main hydrocarbon accumulation periods. If the fault activity is strong during the main hydrocarbon accumulation period, it is considered that the fault is conducive to hydrocarbon drainage and enrichment and has good drainage; otherwise, it has poor drainage. This step will generally give a qualitative evaluation result.

[0085] Step 5: Comprehensive evaluation of strike-slip fracture properties

[0086] This step integrates the results of steps two, three, and four to comprehensively evaluate the "three properties" of strike-slip fractures: their source, conduction, and matching, and arrives at the following conclusions: Figure 6 The comprehensive evaluation diagram of the three properties of strike-slip fracture shown provides basic data for the selection of favorable targets and well location deployment. Figure 6 The red category I represents the fractures with the best overall evaluation of the three properties of source, drainage, and matching; the green category II is slightly worse; and the blue category III is the worst.

[0087] It is generally believed that the stronger the fault activity and the later the activity period, the stronger the destructive effect on oil and gas. Through the three-dimensional analysis of the strike-slip fault, it is concluded that this fault is highly active, and its extension to the Ordovician system is favorable for Caledonian oil and gas charging. After deploying the RP7-H2 well, high production was achieved, with an initial oil pressure of 35 MPa and a daily oil production of 112 tons, accumulating to 3.7 × 10⁴ tons in just one year. This demonstrates that the comprehensive evaluation method for strike-slip faults in this invention is more reliable than conventional methods for selecting favorable targets, identifying oil and gas enrichment zones, providing basic data for favorable target selection and well location deployment, and supporting the efficient development of fault-controlled carbonate reservoirs.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do 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 comprehensive evaluation method for strike-slip faults in ultra-deep carbonate rocks, characterized in that, Includes the following processes: Using seismic data and seismic interpretation horizons, we will identify and characterize strike-slip faults, and compile seismic attribute maps and fault outline maps for each layer. Each layer includes the layer from the top surface of the target layer to the bottom surface of the Cambrian system; Using the seismic attribute maps and fault outline maps of each layer, it is determined whether the strike-slip fault is a continuous fault, and a fault source evaluation map is obtained; when the strike-slip fault is a continuous fault, a conduction evaluation is performed. Based on the seismic attribute maps and fault outline maps of each stratum, the activity intensity and longitudinal connectivity of strike-slip faults are obtained; based on the activity intensity, longitudinal connectivity and stress state of the Middle Cambrian gypsum rock, the conductivity of strike-slip faults is evaluated, and a fault conductivity evaluation map is obtained. The active periods of strike-slip faults are obtained based on the fault outline map; the matching relationship between the active periods of strike-slip faults and the main hydrocarbon accumulation periods is analyzed, the matching of strike-slip faults is evaluated, and the fault matching evaluation map is obtained. Based on the fracture source evaluation map, fracture conductivity evaluation map, and fracture matching evaluation map, a comprehensive evaluation of the three properties of strike-slip fractures is carried out, and a comprehensive evaluation map of the three properties of strike-slip fractures is compiled to provide a basis for deploying development wells along strike-slip fractures.

2. The comprehensive evaluation method for ultra-deep carbonate rock strike-slip faults according to claim 1, characterized in that, The process of identifying and characterizing strike-slip faults using seismic data and seismic interpretation horizons, and compiling seismic attribute maps and fault outline maps for each layer, specifically includes the following steps: 1.

1. Using the depth domain three-dimensional seismic data volume, extract the seismic attribute data volume that can characterize the distribution characteristics of strike-slip faults and carry out seismic horizon interpretation to obtain the horizon data of each layer. The stratigraphic data for each stratum mainly includes the stratigraphic data for the top surface of the Yijianfang Formation of the Ordovician, the bottom surface of the Ordovician, the bottom surface of the Upper Cambrian, and the bottom surface of the Lower Cambrian; 1.

2. Extract seismic attribute maps that reflect the fault distribution characteristics of each layer using the stratigraphic data of each layer, and select sensitive attributes to guide the interpretation of fault planes; 1.3 Combine the seismic attribute map obtained in step 1.2 with the depth domain 3D seismic data volume to perform three-dimensional fault interpretation; 1.4 Combining the seismic attribute map obtained in 1.2 and the fault interpretation results obtained in 1.3, a fault outline map of the main stratigraphic layers is obtained.

3. The comprehensive evaluation method for ultra-deep carbonate rock strike-slip faults according to claim 2, characterized in that, In section 1.1, earthquake properties include coherence, maximum likelihood, structural tensor, and amplitude gradient.

4. The comprehensive evaluation method for ultra-deep carbonate rock strike-slip faults according to claim 2, characterized in that, In section 1.4, the main stratigraphic fault outlines include the fault outlines of the top surface of the Ordovician Yijianfang Formation, the bottom surface of the Ordovician, the bottom surface of the Upper Cambrian, and the bottom surface of the Lower Cambrian.

5. The comprehensive evaluation method for ultra-deep carbonate rock strike-slip faults according to claim 1, characterized in that, Using seismic attribute maps and fault outline maps of each layer, it is determined whether a strike-slip fault is a continuous fault, and a fault source evaluation map is obtained. The specific steps include: 2.1 Overlay the seismic attribute maps and fault outline maps of each stratum. If a fault is developed on several vertical stratigraphic attribute maps, it indicates that it ruptures the Lower Cambrian strata and is judged as a through-source fault; if a fault does not rupture the Lower Cambrian strata, it is judged as a non-through-source fault. 2.2 After integrating the fractures with and without sources, a fracture source evaluation diagram is obtained.

6. The comprehensive evaluation method for ultra-deep carbonate rock strike-slip faults according to claim 2, characterized in that, The process of obtaining the fracture conductivity evaluation map specifically includes the following steps: 3.1 Obtain the activity intensity and longitudinal connectivity of strike-slip faults from the seismic attribute maps and fault outline maps of each layer. The stronger the activity intensity of the strike-slip fault and the more upright the longitudinal connectivity, the better the longitudinal conductivity. 3.2 Vertical channeling of oil and gas requires overcoming the blockage of the Middle Cambrian gypsum rock, and it is necessary to predict the stress state of the Middle Cambrian gypsum rock; 3.3 Taking into account the intensity of strike-slip fault activity, the degree of longitudinal connectivity, and the stress state of the Middle Cambrian gypsum rock, a longitudinal conductivity evaluation of the strike-slip fault was completed, and a fault conductivity evaluation map was obtained.

7. The comprehensive evaluation method for ultra-deep carbonate rock strike-slip faults according to claim 6, characterized in that, In section 3.2, the specific method for predicting the stress state of the Middle Cambrian gypsum rock is as follows: Using the stratigraphic data of the Upper Cambrian bottom obtained in step 1.1, smoothing and calculation were performed to obtain the trend surface map of the Middle Cambrian gypsum-salt rock top surface; If the strike-slip fault is a negative landform on the trend surface map of the top surface of the Middle Cambrian gypsum-salt rock, it indicates that the strike-slip fault is under tensile stress and has good conductivity. If the strike-slip fault is a positive landform on the trend surface map of the top surface of the Middle Cambrian gypsum-salt rock, it indicates that the strike-slip fault is under compressive stress and has poor conductivity.

8. The comprehensive evaluation method for ultra-deep carbonate rock strike-slip faults according to claim 1, characterized in that, The process of obtaining the fracture matching evaluation map, specifically... Includes the following steps: 4.

1. Based on the outline diagram of strike-slip faults in each layer, the active phases of the strike-slip faults are obtained; 4.2 Analyze the spatiotemporal matching relationship between the active periods of strike-slip faults and the main hydrocarbon accumulation periods to obtain a fault matching evaluation map.

9. A comprehensive evaluation method for ultra-deep carbonate rock strike-slip faults according to claim 8, characterized in that, In section 4.2, the main hydrocarbon accumulation periods include the Late Caledonian, Late Hercynian, and Himalayan periods.

10. A comprehensive evaluation method for ultra-deep carbonate rock strike-slip faults according to claim 1, characterized in that, Based on the comprehensive evaluation map of strike-slip fractures, the distribution characteristics of fractures rated as Class I and Class II were obtained, providing basic data for the selection of favorable targets and well location deployment.

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