Method, system and device for determining target points of strike-slip fault pull-apart segment controlled reservoirs

Abstract

The present application relates to the technical field of oil exploration, and more particularly to a method, system and device for determining a target point of a pull-apart segment of a strike-slip fault, the method comprising the following steps: S1, determining a target position range of a pull-apart segment of a strike-slip fault zone, specifically comprising: S101, determining a spatial distribution position of the pull-apart segment of the strike-slip fault zone according to a response feature of a pull-apart segment reservoir of the strike-slip fault zone; S102, determining the target position range of the pull-apart segment of the strike-slip fault zone according to a setting method; S2, selecting a region within a first setting condition range as a target area range of the pull-apart segment of the strike-slip fault zone within the target position range of the pull-apart segment of the strike-slip fault zone determined in S1; S3, selecting a region of a second setting condition as a target point position of the pull-apart segment of the strike-slip fault zone within the target area range of the pull-apart segment of the strike-slip fault zone determined in S2; the target point of the pull-apart segment of the strike-slip fault is designed by considering joint interpretation and analysis of the fault zone and the reservoir, the design accuracy of the target point is improved, and the trajectory target rate is improved.

Description

Technical Field

[0001] This invention relates to the field of petroleum exploration technology, and in particular to methods, systems and apparatus for determining target points of strike-slip fracture pull-segment fault-controlled reservoirs. Background Technology

[0002] The ultra-deep carbonate reservoirs in the Tarim Basin develop along strike-slip faults. Based on stress and fault patterns, four typical segmented structural styles can be identified: strike-slip strike-slip segments, pull-apart segments, compressional uplift segments, and oblique weak compressional segments. The pull-apart segments, in particular, have larger fault-controlled reservoirs and greater fault activity, making them one of the important structural styles of strike-slip faults at various scales. However, the scale and physical properties of reservoirs in different parts of the pull-apart segments vary significantly. To support efficient exploration and development, target design is necessary.

[0003] Existing technology CN110858001B discloses an analytical method for strike-slip fault zones in deep carbonate rocks. The method includes: determining a geological model; determining response characteristics; determining activity periods; and analyzing the strike-slip fault zones in the study area based on the results obtained from the geological model determination, response characteristic determination, and activity period determination steps, obtaining analytical results including: determining the combination type and / or reservoir size. This method, through joint interpretation and analysis of fault zones and reservoirs, clarifies the relationship between strike-slip fault zones and hydrocarbon accumulation and reservoir development characteristics, thus providing strong data support for comprehensive geological condition research, hydrocarbon resource evaluation, and target area selection in areas with complex fault-controlled reservoir development. However, this method does not consider joint interpretation and analysis of fault zones and reservoirs to design target points for strike-slip fault segmentation, failing to guarantee an improved target rate in the trajectory.

[0004] Therefore, there is an urgent need to provide methods, systems, and devices for determining target points in strike-slip fracture pull-out sections of fault-controlled reservoirs. Summary of the Invention

[0005] This invention addresses the technical problems existing in the prior art and provides a method, system, and apparatus for determining target points in strike-slip fracture-controlled reservoir segments.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] The method for determining target points in strike-slip fracture pull-out sections of fault-controlled reservoirs includes the following steps:

[0008] S1. Determine the target area of ​​the strike-slip fault zone pull segment, specifically including the following steps:

[0009] S101. Determine the spatial distribution of the strike-slip fault zone pull-out segments based on the characteristics of the fault and reservoir response.

[0010] S102. In the spatial distribution location generated in S101, determine the target range of the strike-slip fault zone pull-out segment according to the set method.

[0011] S2. Within the target area of ​​the strike-slip fault zone pull-out segment determined in S1, select the area within the first set condition range as the target area of ​​the strike-slip fault zone pull-out segment.

[0012] S3. Within the target area of ​​the strike-slip fault zone pull-out segment determined in S2, select the area with the second set condition as the target point location of the strike-slip fault zone pull-out segment.

[0013] Furthermore, S101 specifically includes the following steps:

[0014] S1011. Determine the reservoir response characteristics of the strike-slip fault zone;

[0015] S1012. Set the normalization threshold value of the reservoir response characteristics determined in S1011.

[0016] S1013. Based on the normalized threshold value of the reservoir response characteristics determined in S1012, determine the spatial distribution location of the strike-slip fault zone pull-out segments.

[0017] Furthermore, the reservoir response characteristics of the strike-slip fault zone determined in step S1011 include linear weak reflection of the fault detection attribute and strong energy anomaly of the cave-like detection attribute. The detection sensitivity attribute of linear weak reflection of the fault detection attribute is set as enhanced coherence attribute, and the strong energy anomaly of the cave-like detection attribute is set as instantaneous energy attribute.

[0018] Furthermore, the normalization threshold value for the enhanced coherence attribute is greater than or equal to a first set value, which is 80.

[0019] Furthermore, the normalization threshold value of the instantaneous energy attribute is greater than or equal to a second set value, which is 87.

[0020] Furthermore, the setting method in step S102 specifically includes the following steps:

[0021] S1021. Determine the location of the main cross-section;

[0022] S1022. Overlay the determined main section location with the distribution location of instantaneous energy attributes, and select the main section with strong energy anomaly development as the target range of the strike-slip fault zone pull segment.

[0023] Furthermore, the method for determining the main cross-section in S1021 is as follows:

[0024] (1) When there are wells in the area to be designed: set the main section as the fault where all wells in the strike-slip fault zone are emptied or lost and leaked.

[0025] (2) When there are no wells in the area to be designed: refer to the location characteristics of the wells in the strike-slip fracture zone pull-out section in the adjacent area where there are wells, and the wells are either empty or lost and leaked, and set the location corresponding to the area to be designed as the main section.

[0026] Furthermore, the second setting condition mentioned in step S3 is: setting the distribution center of the detection sensitive attribute corresponding to the reservoir response characteristics as the target point location of the strike-slip fault zone pull segment.

[0027] Furthermore, the first setting condition mentioned in step S2 is to satisfy one or more of the following: large reservoir size and volume, good static connectivity with surrounding strong energy anomalies, and clear fracture characteristics.

[0028] Furthermore, the reservoir size and volume are determined by the recoverable oil and gas reserves, and a first threshold value is set for the reservoir size and volume to be large if the recoverable oil and gas reserves are greater than or equal to the first threshold value.

[0029] Furthermore, the method for determining good static connectivity with surrounding strong energy anomalies is: being located on the same main cross-section as surrounding strong energy anomalies.

[0030] Furthermore, the clear fracture characteristics are determined by analyzing the clarity of the phase axis section of the seismic data, the vertical fracture displacement, and the length of the fracture plane extension minus the longitudinal fracture depth.

[0031] Furthermore, a clear fracture characteristic is defined as one or more of the following: the phase axis section clarity of seismic data is greater than or equal to the second threshold value; the vertical fracture displacement is greater than or equal to the third threshold value; and the fracture plane extension length minus the longitudinal fracture depth is greater than or equal to the fourth threshold value.

[0032] The system using any of the above-described methods for determining target points of strike-slip fracture pull-out sections of fault-controlled reservoirs includes a first module, a second module, and a third module. The first module performs the content of step S1, the second module performs the content of step S2, and the third module performs the content of step S3.

[0033] An apparatus for determining target points of strike-slip fracture pull-segment fault-controlled reservoirs includes a storage medium and a processor. The storage medium stores a computer program, and the processor is used to implement a method for determining target points of strike-slip fracture pull-segment fault-controlled reservoirs when executing the computer program.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0035] (1) This invention considers the coupling relationship between fracture and reservoir development patterns, analyzes the differences in reservoir development across different sections of strike-slip fault zones, and selects the dominant main fault sections for reservoir development. On these dominant main fault sections, cavernous reservoirs with large volume, good static connectivity to surrounding strong energy anomalies, and clear fracture characteristics are prioritized as target areas for geological target trajectory traversal. Combining the corresponding instantaneous energy attributes of cavernous reservoirs, the reservoir response energy center within the target area is selected as the target core. The systematic design of target points in strike-slip fault sections, combined with comprehensive reservoir evaluation, prioritizes large-scale reservoirs as target points, improving the accuracy of target point design and ensuring a higher target hit rate, thereby increasing exploration efficiency and success rate. Attached Figure Description

[0036] Figure 1 This is a flowchart of the method according to an embodiment of the present invention.

[0037] Figure 2 This is a schematic diagram of the instantaneous energy attribute calibration of the Yingshan Formation of the Ordovician System according to an embodiment of the present invention.

[0038] Figure 3 This is a schematic diagram of the spatial distribution of the strike-slip fracture zone tensile segments according to an embodiment of the present invention.

[0039] Figure 4 This is a schematic diagram showing the superimposed location of the main cross-section and the location of the instantaneous energy attribute distribution in an embodiment of the present invention.

[0040] Figure 5 This is a schematic diagram of the target area determined in an embodiment of the present invention.

[0041] Figure 6 This is a schematic diagram of the target points determined in an embodiment of the present invention.

[0042] Figure 7 This is a schematic diagram illustrating the application effect of the target design of well W1 in the S-3D work area of ​​Shunbei region according to an embodiment of the present invention. Detailed Implementation

[0043] The technical solution of the present invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0044] Example

[0045] Taking a specific 3D work area (hereinafter referred to as the S 3D work area) in the Shunbei region of the Tarim Basin as an example, the following is a more detailed description:

[0046] like Figure 1 As shown, the present invention provides a method for determining target points in strike-slip fracture-controlled reservoirs, comprising the following steps:

[0047] S1. Determine the target area of ​​the strike-slip fault zone pull segment, specifically including the following steps:

[0048] S101. Based on the fracture and reservoir response characteristics of the strike-slip fault zone pull-out segments, determine the spatial distribution of the strike-slip fault zone pull-out segments, specifically including the following steps:

[0049] S1011. Determine the reservoir response characteristics of the strike-slip fault zone: Based on the data revealed by the drilled wells in the area to be designed, the main reservoir is a cave-type reservoir controlled by strike-slip faults. The response characteristics are set as linear weak reflection of the fault detection attribute and strong energy anomaly of the cave-type detection attribute. The detection sensitivity attribute of linear weak reflection of the fault detection attribute is set as enhanced coherence attribute, and the detection sensitivity attribute of strong energy anomaly of the cave-type detection attribute is set as instantaneous energy attribute.

[0050] S1012. Set the normalization threshold value of the reservoir response characteristics determined in S1011: Based on the well logging venting, leakage, and well logging interpretation of cave and fracture reservoirs in the design area, the normalization threshold value of the enhanced coherence attribute and instantaneous energy attribute corresponding to the linear weak reflection of the fracture detection attribute is set to be greater than or equal to the first set value, and the normalization threshold value of the instantaneous energy attribute corresponding to the strong energy anomaly of the cave detection attribute is set to be greater than or equal to the second set value.

[0051] Furthermore, taking well W1 in the S-dimensional work area as an example, the first set value is preferably 80, and the second set value is preferably 87.

[0052] S1013. Based on the normalized threshold value of the reservoir response characteristics determined in S1012, the spatial distribution locations of the strike-slip fault zone pull-out segments are generated. Specifically, a schematic diagram of the instantaneous energy attributes displayed in the Ordovician Yingshan Formation based on the normalized threshold value of the instantaneous energy attributes is shown below. Figure 2 As shown, the resulting spatial distribution map of the strike-slip fault zone tension segments is as follows: Figure 3 As shown.

[0053] S102. Within the spatial distribution of the strike-slip fault zone pull-out segments generated in S101, determine the target range of the strike-slip fault zone pull-out segments according to a set method. The set method specifically includes the following steps:

[0054] S1021. Determine the location of the main section. The specific method is as follows: (1) When there is a well in the area to be designed: set the fracture in the strike-slip fracture zone where all wells are emptied or lost return and leakage is the main section; (2) When there is no well in the area to be designed: refer to the location characteristics of the strike-slip fracture zone in the adjacent area where there are wells where all wells are emptied or lost return and leakage is, and set the location corresponding to the area to be designed as the main section.

[0055] S1022. Overlay the determined main cross-section location with the distribution location of the detection-sensitive attribute of strong energy anomaly in cave-type detection attributes. The schematic diagram of the overlaid cross-section is shown below. Figure 4 As shown, the main cross-section with strong energy anomaly development is selected as the target location for the trajectory to pass through, that is, the target range of the strike-slip fault zone pull segment.

[0056] S2. Within the target area of ​​the strike-slip fault zone pull-out segment determined in S1, select an area within the first set condition range as the target area range of the strike-slip fault zone pull-out segment. The selected target area range is as follows: Figure 5 As shown in the figure, the locations labeled 1 and 2 represent the selected target area range; specifically, the first set of conditions includes one or more of the following: large reservoir size and volume, good static connectivity with surrounding strong energy anomalies, and clear fracture characteristics, wherein:

[0057] (1) Large reservoir size: This is determined by comparing the recoverable oil and gas reserves with the first threshold value. If the recoverable oil and gas reserves are greater than or equal to the first threshold value, it indicates that the reservoir size is large.

[0058] (2) Good static connectivity with surrounding strong energy anomalies: The criterion for judging good static connectivity is that it is located on the same main cross section as surrounding strong energy anomalies.

[0059] (3) Having clear fracture characteristics: This is determined by analyzing the clarity of the phase axis section of the seismic data, the vertical displacement of the fracture, and the length of the fracture plane extension minus the longitudinal fracture depth. It is set that one or more of the following conditions are met: the clarity of the phase axis section of the seismic data is greater than or equal to the second threshold value, the vertical displacement of the fracture is greater than the third threshold value, and the length of the fracture plane extension minus the longitudinal fracture depth is greater than or equal to the fourth threshold value. Specifically, the third threshold value is preferably 30m.

[0060] While meeting the first set conditions, areas with strong energy anomalies exhibiting a "cluster-like beaded" pattern were specifically selected as the target area for the strike-slip fault zone pull segment.

[0061] S3. Within the target area of ​​the strike-slip fault zone pull-out segment determined in S2, select a region that meets the second preset condition as the target point for the strike-slip fault zone pull-out segment. The location of the selected target point is as follows: Figure 6 As shown, Figure 6 The positions marked 1 and 2 are the selected target points. The second setting condition is: set the distribution center of the detection sensitive attribute corresponding to the reservoir response characteristics. Specifically, set the reservoir response characteristics as cave-type detection attributes with strong energy anomalies, and the corresponding detection sensitive attribute is the instantaneous energy attribute.

[0062] The application effect diagram of the above-mentioned method of the present invention on well W1 in the S-dimensional work area is shown in the figure below. Figure 7 As shown, the designed target hit rate is 85%, the initial daily fluid production is 419.3 t / d, the daily oil production is 309.5 t / d, and the daily gas production is 59.7 × 10⁻⁶. 4 m 3 By considering the coupling relationship between fractures and reservoir development patterns, this study analyzes the differences in reservoir development across different main sections of strike-slip fault zones and selects the most advantageous main sections for reservoir development. On these advantageous main sections, cavernous reservoirs with large volume, good static connectivity to surrounding strong energy anomalies, and clear fracture characteristics are prioritized as target areas for geological trajectory traversal. Combining the corresponding instantaneous energy attributes of cavernous reservoirs, the reservoir response energy center within the target area is selected as the bullseye. This systematic design of target points in strike-slip fault zones, combined with comprehensive reservoir evaluation, prioritizes large-scale reservoirs as target points, ensuring a higher target success rate and improving exploration efficiency and success rate.

[0063] The present invention also provides a system for determining the target point of the strike-slip fracture pull-segment fault-controlled reservoir, comprising a first module, a second module and a third module connected in sequence, wherein the first module is used to execute the contents of step S1, the second module is used to execute the contents of step S2 and the third module is used to execute the contents of step S3.

[0064] The present invention also provides an apparatus for determining target points of strike-slip fracture pull-out sections of fault-controlled reservoirs, including a storage medium and a processor. The storage medium stores a computer program, and the processor is used to implement a method for determining target points of strike-slip fracture pull-out sections of fault-controlled reservoirs when executing the computer program.

[0065] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A method for determining target points in strike-slip fracture-controlled reservoirs, characterized in that, Includes the following steps: S1. Determine the target area of ​​the strike-slip fault zone pull segment, specifically including the following steps: S101. Determine the spatial distribution of the strike-slip fault zone pull-out segments based on the reservoir fracture and response characteristics. S101 specifically includes the following steps: S1011. Determine the reservoir response characteristics of the strike-slip fault zone; The reservoir response characteristics of the strike-slip fault zone determined in step S1011 include linear weak reflection of the fault detection attribute and strong energy anomaly of the cave-like detection attribute. The detection sensitivity attribute of linear weak reflection of the fault detection attribute is set as enhanced coherence attribute, and the strong energy anomaly of the cave-like detection attribute is set as instantaneous energy attribute. S1012. Set the normalization threshold value of the reservoir response characteristics determined in S1011. S1013. Based on the normalized threshold value of the reservoir response characteristics determined in S1012, generate the spatial distribution location of the strike-slip fault zone pull-out segment. S102. In the spatial distribution location generated in S101, determine the target range of the strike-slip fault zone pull-out segment according to the set method. The setting method in step S102 specifically includes the following steps: S1021. Determine the location of the main cross-section; S1022. Overlay the determined main section location with the distribution location of instantaneous energy attributes, and select the main section with strong energy anomaly development as the target range of the strike-slip fault zone pull-out segment. S2. Within the target area of ​​the strike-slip fault zone pull-out segment determined in S1, select the area within the first set condition range as the target area of ​​the strike-slip fault zone pull-out segment. The first setting condition mentioned in step S2 is to satisfy one or more of the following: large reservoir size and volume, good static connectivity with surrounding strong energy anomalies, and clear fracture characteristics. S3. Within the target area of ​​the strike-slip fault zone pull-out segment determined in S2, select the area with the second set condition as the target point location of the strike-slip fault zone pull-out segment. The second setting condition mentioned in step S3 is: setting the distribution center of the detection sensitive attribute corresponding to the reservoir response characteristics as the target point location of the strike-slip fault zone pull segment.

2. The method for determining the target point of a strike-slip fracture-controlled reservoir segment according to claim 1, characterized in that, The normalization threshold value for the enhanced coherence attribute is greater than or equal to a first set value, which is 80.

3. The method for determining the target point of a strike-slip fracture-controlled reservoir segment according to claim 1, characterized in that, The normalization threshold value of the instantaneous energy attribute is greater than or equal to a second set value, which is 87.

4. The method for determining the target point of a strike-slip fracture-controlled reservoir segment according to claim 1, characterized in that, The method for determining the main cross-section in S1021 is as follows: (1) When there are wells in the area to be designed: set the main section as the fault where all wells in the strike-slip fault zone are emptied or lost and leaked; (2) When there are no wells in the area to be designed: refer to the location characteristics of the wells in the strike-slip fracture zone pull-out section in the adjacent area where there are wells, and the wells are either empty or lost and leaked, and set the location corresponding to the area to be designed as the main section.

5. The method for determining the target point of a strike-slip fracture pull-out segmented reservoir according to claim 1, characterized in that, The reservoir size and volume are determined by the recoverable oil and gas reserves, and a first threshold value of recoverable oil and gas reserves being greater than or equal to the reservoir size and volume is set.

6. The method for determining the target point of a strike-slip fracture pull-out segmented reservoir according to claim 1, characterized in that, The method for determining good static connectivity with surrounding strong energy anomalies is: the anomalies are located on the same main cross section.

7. The method for determining the target point of a strike-slip fracture pull-out segmented reservoir according to claim 1, characterized in that, The characteristics of a clear fracture are determined by analyzing the clarity of the phase axis section of seismic data, the vertical displacement of the fracture, and the length of the fracture plane extension minus the longitudinal fracture depth.

8. The method for determining the target point of a strike-slip fracture pull-out segmented reservoir according to claim 7, characterized in that, A clear fracture characteristic is defined as one or more of the following: the phase axis section clarity of seismic data is greater than or equal to the second threshold value; the vertical fault displacement is greater than or equal to the third threshold value; and the length of the fracture plane extension minus the longitudinal fracture depth is greater than or equal to the fourth threshold value.

9. A system for determining strike-slip fracture pull-out fault-controlled reservoir target points using any one of claims 1-8, characterized in that, It includes a first module, a second module, and a third module. The first module executes the content of step S1, the second module executes the content of step S2, and the third module executes the content of step S3.

10. An apparatus for determining target points of strike-slip fracture-controlled reservoirs, characterized in that, The method includes a storage medium and a processor, wherein the storage medium stores a computer program, and the processor is configured to, when executing the computer program, implement the method for determining the target point of the strike-slip fracture pull-segment fault-controlled reservoir as described in any one of claims 1-8.

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