Method, system and device for determining strike-slip fracture pull section fault control reservoir target spot

Abstract

The invention relates to the technical field of oil exploration, in particular to a method, a system and a device for determining a strike-slip fracture pull section fault control reservoir target spot, and the method comprises the following steps: S1, determining a strike-slip fracture zone pull section target position range: S101, determining the spatial distribution position of a strike-slip fracture zone pull section according to the response characteristics of a strike-slip fracture zone pull section reservoir; s102, determining a target position range of a strike-slip fault strip pull segment according to a setting method; s2, in the strike-slip fault zone pull segment target position range determined in the S1, selecting a region in a first set condition range as a strike-slip fault zone pull segment target region range; s3, in the strike-slip fault zone pull segment target region range determined in the S2, selecting a region under a second set condition as a strike-slip fault zone pull segment target point position; by considering fault zone-reservoir combined interpretation and analysis, strike-slip fracture pull segmentation target spot design is carried out, the target spot design accuracy is improved, and a guarantee is provided for improving the target rate in a track.

Description

Technical Field

[0001] The present invention relates to the technical field of petroleum exploration, and in particular to a method, system and device for determining target points of strike-slip fault segmentation fault-controlled reservoirs. Background Art

[0002] Ultra-deep carbonate reservoirs in the Tarim Basin develop along strike-slip faults. Combining stress and fault patterns, four typical segmented structural styles can be identified: strike-slip translation segment, pull-apart segment, pressure-uplift segment, and oblique weak compression segment. The pull-apart segment corresponds to a larger fault-controlled reservoir with greater fault activity intensity, making it one of the most important structural styles of strike-slip faults at all scales. However, the scale and physical properties of reservoirs in different parts of the pull-apart segment vary significantly. To support efficient exploration and development, target design is necessary.

[0003] Prior art CN110858001B discloses a method for analyzing strike-slip fault zones in deep carbonate rocks, the method comprising: determining a geological model; determining response characteristics; determining an activity period; analyzing the strike-slip fault zone in the study area based on the results obtained from the geological model determination step, the response characteristic determination step, and the activity period determination step, and obtaining analysis results, including: determining the combination type and / or determining the size of the reservoir. The above method clarifies the laws governing the relationship between strike-slip fault zones and oil and gas accumulation and reservoir development characteristics through joint interpretation and analysis of fault zones and reservoirs, thereby providing strong data support for comprehensive geological condition research, oil and gas resource evaluation, and target area optimization in areas with complex fault-controlled reservoir development. However, the above method does not design strike-slip fault segmentation targets by considering the joint interpretation and analysis of fault zones and reservoirs, and cannot provide a guarantee for improving the trajectory hit rate.

[0004] Therefore, there is an urgent need to provide a method, system and device for determining the target points of the strike-slip fault segmentation fault-controlled reservoir. Summary of the Invention

[0005] The present invention solves the technical problems existing in the prior art and provides a method, system and device for determining target points of a strike-slip fault segmentation fault-controlled reservoir.

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

[0007] The method for determining the reservoir target point controlled by the strike-slip fault segmentation includes the following steps:

[0008] S1. Determine the target range of the strike-slip fault zone tensile segmentation, specifically including the following steps:

[0009] S101. Determine the spatial distribution of the strike-slip fault zone's tensile segments based on the strike-slip fault zone's tensile segment fracture and reservoir response characteristics;

[0010] S102. Determine the target position range of the strike-slip fault zone pull-apart segment in the spatial distribution position generated in S101 according to a set method;

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

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

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

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

[0015] S1012. Setting a normalized threshold value of the reservoir response characteristic determined in S1011;

[0016] S1013. Determine the spatial distribution position of the strike-slip fault zone pull-apart segments based on the normalized threshold value of the reservoir response characteristics determined in S1012.

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

[0018] Furthermore, the normalized threshold value of the enhanced coherence attribute is greater than or equal to a first set value, and the first set value is 80.

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

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

[0021] S1021. Determine the main section position;

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

[0023] Furthermore, the method for determining the main section in S1021 is:

[0024] (1) When there are wells in the design area: the fault in which all wells are empty or have lost return or leakage in the strike-slip fault zone is set as the main section;

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

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

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

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

[0029] Furthermore, the method for judging whether there is good static connectivity with the surrounding strong energy anomalies is: being in the same main section as the surrounding strong energy anomalies.

[0030] Furthermore, the clear fracture characteristics are determined by analyzing the clarity of the phase axis section, the vertical fault throw, and the extended length of the fracture plane - the longitudinal fracture depth of the seismic data.

[0031] Furthermore, 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 fault throw of the fault is greater than or equal to the third threshold value; and the extended length of the fault plane minus the longitudinal fault depth is greater than or equal to the fourth threshold value, which is considered to have clear fault characteristics.

[0032] A system using any of the above-described methods for determining strike-slip fault segmentation fault-controlled reservoir targets includes a first module, a second module, and a third module. The first module executes the contents of step S1, the second module executes the contents of step S2, and the third module executes the contents of step S3.

[0033] The device for determining the target point of a strike-slip fault segmented fault-controlled reservoir comprises a storage medium and a processor. The storage medium stores a computer program. The processor is used to implement a method for determining the target point of a strike-slip fault segmented fault-controlled reservoir when executing the computer program.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] (1) The present invention analyzes the differences in reservoir development in different sections of the strike-slip fault zone by considering the coupling relationship between faults and reservoir development laws, and selects the dominant main section of reservoir development. On the dominant main section, cave reservoirs with large scale and volume, good static connectivity with surrounding strong energy anomalies, and clear fault characteristics are preferentially selected as the target area for the geological target trajectory to pass through. Combined with the corresponding instantaneous energy properties of the cave reservoirs, the reservoir response energy center in the target area is preferably selected as the target center. The strike-slip fault zone target is systematically designed, combined with the comprehensive evaluation of the reservoir, and large-scale reservoirs are selected as targets to improve the accuracy of target design, provide a guarantee for improving the trajectory target rate, and improve the exploration efficiency and success rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a flow chart of a 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 Ordovician Yingshan Formation according to an embodiment of the present invention.

[0038] Figure 3 It is a schematic diagram of the spatial distribution of the pull-apart segments of the strike-slip fault zone according to an embodiment of the present invention.

[0039] Figure 4 It is a schematic diagram of the superposition of the main cross-section position and the instantaneous energy attribute distribution position of the embodiment of the present invention.

[0040] Figure 5 Schematic diagram of the target area determined in the embodiment of the present invention.

[0041] Figure 6 Schematic diagram of the target determined in the embodiment of the present invention.

[0042] Figure 7 It is a schematic diagram of the application effect of the embodiment of the present invention on the target design of the W1 well in the S three-dimensional work area in Shunbei area. DETAILED DESCRIPTION

[0043] The technical solution of the present invention will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0044] Example

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

[0046] like Figure 1 As shown, the present invention provides a method for determining a strike-slip fault segmentation fault-controlled reservoir target, comprising the following steps:

[0047] S1. Determine the target range of the strike-slip fault zone tensile segmentation, specifically including the following steps:

[0048] S101, determining the spatial distribution of the strike-slip fault zone's tensile segments based on the strike-slip fault zone's tensile segment fractures and reservoir response characteristics, specifically comprising the following steps:

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

[0050] S1012. Setting the normalized threshold value of the reservoir response characteristics determined in S1011: Based on the reservoir response characteristics of the cave and fracture type reservoirs in the seismic data of the drilling and logging emptying, leakage, and well logging interpretation of the area to be designed, the coherence attribute and the instantaneous energy attribute are enhanced. The normalized threshold value of the enhanced coherence attribute corresponding to the linear weak reflection of the fracture detection attribute is set to be greater than or equal to a first set value, and the normalized 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 a second set value.

[0051] Furthermore, taking the W1 well in the S 3D work area as an example, the first setting value is preferably 80, and the second setting value is preferably 87;

[0052] S1013. Based on the normalized threshold value of the reservoir response characteristics determined in S1012, the spatial distribution position of the strike-slip fault zone pull-apart segment is generated. Specifically, the schematic diagram of the instantaneous energy attribute displayed according to the normalized threshold value of the instantaneous energy attribute in the Ordovician Yingshan Formation is as follows: Figure 2 The spatial distribution of the strike-slip fault zone pull-off segments generated is shown in Figure 3 shown.

[0053] S102. Determine the target position range of the strike-slip fault zone pull-through segment in the spatial distribution position of the strike-slip fault zone pull-through segment generated in S101 according to a setting method. The setting method specifically includes the following steps:

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

[0055] S1022. Overlay the determined main section position with the distribution position of the detection sensitive attribute of the cave-type detection attribute strong energy anomaly. The cross-section diagram after overlay is as follows: Figure 4 As shown in the figure, the main section with strong energy anomaly development is selected as the target position of the trajectory penetration, that is, the target position range of the strike-slip fault zone pull-off segment.

[0056] S2. Within the target range of the strike-slip fault zone pull-through segment determined in S1, the area within the first set condition is selected as the strike-slip fault zone pull-through segment target area. The selected target area is as follows: Figure 5 As shown in the figure, the positions marked 1 and 2 are the selected target areas. Specifically, the first set condition includes satisfying one or more of the following: large reservoir volume, good static connectivity with surrounding strong energy anomalies, and clear fracture characteristics, among which:

[0057] (1) Large reservoir size: This is determined by comparing the recoverable oil and gas reserves with a 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 in the same main section with surrounding strong energy anomalies.

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

[0060] While meeting the first set condition, the strong energy anomaly area showing "clustered beads" is especially selected as the target area for the strike-slip fault zone pull-off segmentation.

[0061] S3. In the target area of the strike-slip fault zone pull-through segment determined in S2, the area that meets the second set condition is selected as the strike-slip fault zone pull-through segment target point. The location of the selected target point is as follows: Figure 6 As shown, Figure 6 The positions marked with numbers 1 and 2 are the selected targets. The second setting condition is: setting the distribution center of the detection sensitive attribute corresponding to the reservoir response characteristic. Specifically, the reservoir response characteristic is set to the strong energy anomaly of the cave-type detection attribute, and its corresponding detection sensitive attribute is the instantaneous energy attribute.

[0062] After the W1 well in the S three-dimensional work area adopts the above method of the present invention, the application effect diagram is as follows: Figure 7 As shown in the figure, the target hit rate after design is 85%, the initial daily fluid production of the well is 419.3t / d, the daily oil production is 309.5t / d, and the daily gas production is 59.7×10 4 m 3 / d. By considering the coupled relationship between fault and reservoir development patterns, the differences in reservoir development across different main sections of the strike-slip fault zone pull-apart segment are analyzed, and dominant main sections with reservoir development are prioritized. Within these dominant main sections, cavernous reservoirs with large volumes, good static connectivity with surrounding strong energy anomalies, and clear fracture characteristics are prioritized as targets for geological target trajectories. Based on the corresponding instantaneous energy properties of cavernous reservoirs, the reservoir response energy center within the target area is selected as the bull's eye. Systematically designing targets within the strike-slip fault pull-apart segment, combined with comprehensive reservoir evaluation, prioritizes large-scale reservoirs as targets, ensuring a high trajectory hit rate and improving exploration efficiency and success rate.

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

[0064] The present invention also provides a device for determining the target point of a strike-slip fault segmented fault-controlled reservoir, comprising a storage medium and a processor, wherein a computer program is stored on the storage medium, and the processor is used to implement a method for determining the target point of a strike-slip fault segmented fault-controlled reservoir 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, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A method for determining target points of strike-slip fault segmentation-controlled reservoirs, characterized in that: The following steps are involved: S1. Determine the target range of the strike-slip fault zone tensile segmentation, specifically including the following steps: S101. Determine the spatial distribution of the strike-slip fault zone pull-through segment based on reservoir fracture and response characteristics of the pull-through segment; S102. Determine the target position range of the strike-slip fault zone pull-apart segment according to the set method in the spatial distribution position generated in S101; S2. Within the target range of the strike-slip fault zone pull-through segment determined in S1, select the area within the first set condition as the target area range of the strike-slip fault zone pull-through segment; S3. Within the target area of the strike-slip fault zone pull-through segment determined in S2, select the area under the second set condition as the target point location of the strike-slip fault zone pull-through segment.

2. The method for determining the target point of a strike-slip fault segmentation-controlled reservoir according to claim 1, characterized in that: S101 specifically includes the following steps: S1011. Determine the reservoir response characteristics of the strike-slip fault zone; S1012. Setting a normalized threshold value of the reservoir response characteristic determined in S1011; S1013. Generate the spatial distribution position of the strike-slip fault zone pull-off segment according to the normalized threshold value of the reservoir response characteristic determined in S1012.

3. The method for determining the target point of a strike-slip fault segmentation-controlled reservoir according to claim 2, characterized in that: The reservoir response characteristics of the strike-slip fault zone determined in step S1011 include the fault detection attribute linear weak reflection and the cave detection attribute strong energy anomaly. The detection sensitivity attribute of the fault detection attribute linear weak reflection is set to the enhanced coherence attribute, and the cave detection attribute strong energy anomaly is set to the instantaneous energy attribute.

4. The method for determining the target point of a strike-slip fault segmentation-controlled reservoir according to claim 3, characterized in that: The normalized threshold value of the enhanced coherence attribute is greater than or equal to a first set value, and the first set value is 80.

5. The method for determining the target point of a strike-slip fault segmentation-controlled reservoir according to claim 3, characterized in that: The normalized threshold value of the instantaneous energy attribute is greater than or equal to a second set value, and the second set value is 87.

6. The method for determining target points of strike-slip fault segmentation-controlled reservoirs according to claim 3, characterized in that: The setting method in step S102 specifically includes the following steps: S1021. Determine the main section position; S1022. Overlay the determined main section position with the distribution position of the instantaneous energy attribute, and select the main section with strong energy anomaly development as the target position range of the strike-slip fault zone pull-apart segment.

7. The method for determining the target point of a strike-slip fault segmentation-controlled reservoir according to claim 6, characterized in that: The method for determining the main section in S1021 is: (1) When there are wells in the design area: the fault in which all wells are empty or have lost return or leakage in the strike-slip fault zone is set as the main section; (2) When there is no drilling in the area to be designed: refer to the location characteristics of the wells in the strike-slip fault zone pull-off section in the adjacent area where there are drilling wells, where all the wells are empty or lost, and set the location corresponding to the area to be designed as the main section.

8. The method for determining target points of strike-slip fault segmentation-controlled reservoirs according to claim 2, characterized in that: The second setting condition in step S3 is: setting the distribution center of the detection sensitive attribute corresponding to the reservoir response characteristic to the target point position of the strike-slip fault zone pull-off segment.

9. The method for determining target points of strike-slip fault segmentation-controlled reservoirs according to claim 1, characterized in that: The first setting condition described in step S2 is to meet one or more of the following: the reservoir is large in scale and volume, has good static connectivity with surrounding strong energy anomalies, and has clear fracture characteristics.

10. The method for determining target points of strike-slip fault segmentation-controlled reservoirs according to claim 9, characterized in that: The reservoir scale volume is determined by recoverable oil and gas reserves, and a reservoir scale volume is large when recoverable oil and gas reserves are greater than or equal to a first threshold value.

11. The method for determining target points of strike-slip fault segmentation-controlled reservoirs according to claim 9, characterized in that: The method for judging whether there is good static connectivity with the surrounding strong energy anomalies is: being in the same main section as the surrounding strong energy anomalies.

12. The method for determining target points of strike-slip fault segmentation-controlled reservoirs according to claim 9, characterized in that: The clear fracture characteristics are determined by analyzing the clarity of the phase axis section of the seismic data, the vertical fault throw of the fracture, and the extended length of the fracture plane - the longitudinal fracture depth.

13. The method for determining target points of strike-slip fault segmentation-controlled reservoirs according to claim 12, characterized in that: 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 fault throw of the fault is greater than or equal to the third threshold value; and the extended length of the fault plane minus the longitudinal fault depth is greater than or equal to the fourth threshold value, which is considered to have clear fault characteristics.

14. A system using the method for determining reservoir target points controlled by strike-slip fault segmentation according to any one of claims 1 to 13, characterized in that: It includes a first module, a second module and a third module. The first module executes the content in step S1, the second module executes the content in step S2, and the third module executes the content in step S3.

15. A device for determining target points of strike-slip fault segmentation-controlled reservoirs, characterized in that: The method comprises a storage medium and a processor, wherein the storage medium stores a computer program, and the processor is used to implement the method for determining a strike-slip fault segmentation fault-controlled reservoir target point as claimed in any one of claims 1 to 13 when executing the computer program.

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