Turbidite sandstone lithologic trap identification method, device, electronic device and storage medium

Abstract

The present invention provides a method, device, electronic device, and storage medium for identifying turbidite sandstone lithologic traps. The method comprises: obtaining a seismic profile of the turbidite sandstone based on 3D seismic data to determine the seismic facies characteristics of the turbidite sandstone; tracking and comparing the top and bottom envelope surfaces of the seismic facies; determining the pinch-out line of the turbidite sandstone based on the depth difference between the bottom and top envelope surfaces; determining the development and closure locations of updip pinch-out lithologic traps in the turbidite sandstone based on a structural contour map of the bottom envelope surface; obtaining the external morphology of the seismic reflection corresponding to the turbidite sandstone within the updip pinch-out lithologic trap; and then, based on the updip lithologic traps, determining the development location and closure area of ​​favorable updip pinch-out lithologic traps in deep-sea turbidite sandstone. In the present invention, a "well-free deep-sea turbidite sandstone lithologic trap identification method" is used to identify deep-sea turbidite sandstones under conditions with few or no wells, thereby improving the success rate of deepwater oil and gas exploration.

Description

Technical Field

[0001] The present application relates to the technical field of deep-sea lithologic oil and gas reservoir exploration, and in particular to a method, device, electronic equipment, and storage medium for identifying deep-sea turbidite lithologic traps without well constraints. Background Art

[0002] Existing methods for identifying updip pinch-out lithologic traps in deep-sea turbidite sandstones rely heavily on drilling and logging data, primarily focusing on the well-constrained identification of updip pinch-out lithologic traps in deep-sea turbidite sandstones. This technology leverages the elasticity information of deep-sea turbidite sandstones contained in drilling data. Using these elastic parameters, a correspondence is established between the rock physics information of deep-sea turbidite sandstones (such as mass flow deposits) and seismic attributes, thereby obtaining lithologic and reservoir information about the deep-sea turbidite sandstones.

[0003] The existing "method for identifying updip pinch-out lithologic traps in deep-sea turbidite sandstones"—a well-constrained technique for identifying updip pinch-out lithologic traps in deep-sea turbidite sandstones—relies on drilling and logging data. Consequently, existing techniques are difficult to apply to conditions with few or no wells. Therefore, there is an urgent need to creatively develop a "well-free method for identifying lithologic traps in deep-sea turbidite sandstones" specifically for these conditions, thereby improving the success rate of deepwater oil and gas exploration. Summary of the Invention

[0004] In view of this, the present application provides a method, device, electronic equipment and storage medium for identifying turbidite sandstone lithologic traps, so as to solve the problem in the prior art of relying on drilling / logging data to determine updip pinch-out lithologic traps in deep-sea turbidite sandstones, which is difficult to apply to working conditions with no wells or few wells.

[0005] In a first aspect, an embodiment of the present application provides a method for identifying lithologic traps in turbidite sandstones, comprising:

[0006] Based on 3D seismic data, a seismic profile of the deep-sea turbidite sandstone to be evaluated is obtained to determine the seismic facies characteristics of the deep-sea turbidite sandstone to be evaluated;

[0007] Using the seismic facies feature similarity comparison method, track and compare the top envelope surface and the bottom envelope surface of the seismic facies corresponding to the deep-sea turbidite sandstone to be evaluated;

[0008] Determine the pinch-out line of the deep-sea turbidite sandstone to be evaluated based on the difference between the bottom envelope surface depth and the top envelope surface depth of the seismic phase corresponding to the deep-sea turbidite sandstone to be evaluated, wherein the pinch-out line of the deep-sea turbidite sandstone to be evaluated is the envelope line where the formation thickness decreases to zero;

[0009] Determine the development and closure positions of the updip pinch-out lithologic traps in the deep-sea turbidite sandstone to be evaluated based on the structural contour map of the bottom envelope surface;

[0010] According to the seismic profile of the updip pinch-out lithologic trap of the deep-sea turbidite sandstone to be evaluated, the external morphology of the seismic reflection corresponding to the deep-sea turbidite sandstone to be evaluated in the updip pinch-out lithologic trap is obtained;

[0011] Based on the external morphology of the seismic reflection corresponding to the deep-sea turbidite sandstone to be evaluated and the updip lithologic traps of the deep-sea turbidite sandstone to be evaluated, the development position and closure area of ​​the favorable updip pinch-out lithologic traps of the deep-sea turbidite sandstone are determined.

[0012] In one possible implementation, obtaining a seismic profile of the deep-sea turbidite sandstone to be evaluated based on 3D seismic data and determining the seismic facies of the deep-sea turbidite sandstone to be evaluated includes:

[0013] Use 3D seismic data to obtain seismic sections along and perpendicular to the source direction of the deep-sea turbidite sandstone to be evaluated;

[0014] The seismic phase characteristics of the deep-sea turbidite sandstone to be evaluated are determined based on the seismic profile in the provenance direction and the perpendicular source direction of the deep-sea turbidite sandstone to be evaluated; the seismic phase characteristics include the external morphology of seismic reflection, physical seismological parameters and internal structure.

[0015] In a possible implementation, the use of a seismic facies feature similarity comparison method to track and compare the top envelope surface and the bottom envelope surface of the seismic facies corresponding to the deep-sea turbidite sandstone to be evaluated includes:

[0016] Based on the determined seismic facies characteristics of the deep-sea turbidite sandstone to be evaluated, determining the top envelope surface and the bottom envelope surface of the seismic reflection having the same or similar seismic facies characteristics;

[0017] The seismic phase feature similarity comparison method is used to track and compare the top and bottom envelope surfaces with the same seismic phase in the directions along and perpendicular to the provenance, respectively, to achieve three-dimensional space closure.

[0018] In a possible implementation, determining the pinch-out line of the deep-sea turbidite sandstone to be evaluated based on the difference between the bottom envelope surface depth and the top envelope surface depth of the seismic facies corresponding to the deep-sea turbidite sandstone to be evaluated includes:

[0019] measuring the depths of the bottom envelope surface and the top envelope surface respectively;

[0020] Determining a plane thickness contour map of the deep-sea turbidite sandstone to be evaluated based on the difference between the depth of the bottom envelope surface and the depth of the top envelope surface;

[0021] According to the values ​​of the contour lines on the plane thickness contour map, an envelope line where the formation thickness decreases to zero is obtained. The envelope line where the formation thickness decreases to zero is the pinch-out line of the deep-sea turbidite sandstone to be evaluated.

[0022] In a possible implementation, determining the development position and closure position of the updip pinch-out lithologic trap of the deep-sea turbidite sandstone to be evaluated based on the structural contour map of the bottom envelope surface includes:

[0023] Determining a structural contour map of the bottom envelope of the deep-sea turbidite sandstone to be evaluated based on the measured depth value of the bottom envelope;

[0024] Projecting the pinch-out line of the deep-sea turbidite sandstone to be evaluated onto the structural contour map of the bottom envelope surface;

[0025] Determine the development location and area of ​​the updip pinch-out trap of the deep-sea turbidite sandstone to be evaluated based on whether the values ​​of the bottom envelope structural contour lines enclosed by the pinch-out line of the deep-sea turbidite sandstone to be evaluated decrease in the direction of stratum thinning;

[0026] The determination of the development position and closure of the updip pinch-out trap of the deep-sea turbidite sandstone to be evaluated based on whether the values ​​of the bottom envelope structural contour lines enclosed by the pinch-out line of the deep-sea turbidite sandstone to be evaluated decrease in the direction of thinning of the formation thickness includes:

[0027] If the values ​​of the bottom envelope structural contour lines enclosed by the proposed deep-sea turbidite sandstone pinch-out line decrease in the direction of stratum thinning, the area enclosed by the proposed deep-sea turbidite sandstone pinch-out line is the development location of the proposed deep-sea turbidite sandstone updip pinch-out lithologic trap, and the area of ​​the area enclosed by the proposed deep-sea turbidite sandstone pinch-out line is the closed area of ​​the proposed deep-sea turbidite sandstone updip pinch-out lithologic trap.

[0028] If the values ​​of the bottom envelope structural contour lines enclosed by the pinch-out line of the deep-sea turbidite sandstone to be evaluated do not decrease in the direction of thinning of the formation thickness, then the deep-sea turbidite sandstone to be evaluated is not developed and there is no updip pinch-out lithologic trap.

[0029] In one possible implementation, determining the development location and closed area of ​​favorable updip pinch-out lithologic traps of deep-sea turbidite sandstones based on the external morphology of seismic reflections corresponding to the deep-sea turbidite sandstones to be evaluated and the updip lithologic traps of the deep-sea turbidite sandstones to be evaluated includes:

[0030] Determine a seismic reflection unit of the proposed deep-sea turbidite sandstone having a predetermined thickness and a reduced dome-shaped convex profile based on the external morphology of the corresponding seismic reflection of the proposed deep-sea turbidite sandstone within the up-dip pinch-out lithologic trap; the predetermined thickness is at least 50 m;

[0031] Obtaining the plane distribution range of the deep-sea turbidite sandstone seismic reflection unit to be evaluated that reaches a preset thickness and has a reduced dome-shaped top convex profile,

[0032] The intersection area of ​​the planar distribution range of the deep-sea turbidite sandstone seismic reflection unit to be evaluated and the updip pinch-out lithologic trap of the deep-sea turbidite sandstone to be evaluated is the development location of the favorable updip pinch-out lithologic trap of the deep-sea turbidite sandstone, and the area of ​​the intersection area is the closed area of ​​the favorable updip pinch-out lithologic trap of the deep-sea turbidite sandstone.

[0033] In one possible implementation, the external morphology of the seismic reflection includes a wedge-shaped shape, a hillock-shaped shape, a sheet-shaped shape, a lens-shaped shape, etc. The external morphology of the seismic reflection is determined according to the external characteristics of the deep-sea turbidite sandstone seismic phase to be evaluated.

[0034] In one possible implementation, the physical seismological parameters of the seismic reflection include: a seismic reflection amplitude determined according to the color depth of the seismic reflection layer, a seismic reflection frequency determined according to the thickness of a single seismic reflection layer, and a seismic reflection continuity determined according to the lateral continuity of the seismic reflection layer.

[0035] In one possible implementation, the internal structure of the seismic reflection includes a parallel and sub-parallel structure, a chaotic structure, a filling structure, and a hillock structure; the internal structure of the seismic reflection is determined according to the superposition relationship of the seismic reflection phase axes constituting the deep-sea turbidite sandstone seismic phase to be evaluated.

[0036] In a second aspect, an embodiment of the present application provides a turbidite sandstone lithologic trap identification device, comprising:

[0037] Seismic phase feature acquisition module: used to obtain the seismic profile of the deep-sea turbidite sandstone to be evaluated based on 3D seismic data, and determine the seismic phase features of the deep-sea turbidite sandstone to be evaluated;

[0038] Seismic phase feature comparison module: used to track and compare the top envelope surface and the bottom envelope surface of the seismic phase corresponding to the deep-sea turbidite sandstone to be evaluated;

[0039] a pinch-out line acquisition module, configured to determine the pinch-out line of the deep-sea turbidite sandstone to be evaluated based on the difference between the bottom envelope surface depth and the top envelope surface depth of the seismic phase corresponding to the deep-sea turbidite sandstone to be evaluated, wherein the pinch-out line of the deep-sea turbidite sandstone to be evaluated is the envelope line where the formation thickness decreases to zero;

[0040] A first development position and closure position acquisition module is used to determine the development position and closure position of the updip pinch-out lithologic trap of the deep-sea turbidite sandstone to be evaluated based on the structural contour map of the bottom envelope surface;

[0041] A seismic reflection external morphology acquisition module is used to acquire the external morphology of seismic reflection corresponding to the deep-sea turbidite sandstone to be evaluated in the updip pinch-out lithologic trap according to the seismic profile of the deep-sea turbidite sandstone to be evaluated;

[0042] The second development position and closure position acquisition module: determines the development position and closure area of ​​the favorable deep-sea turbidite sandstone updip pinch-out lithologic trap based on the external morphology of the seismic reflection corresponding to the deep-sea turbidite sandstone to be evaluated and the updip lithologic trap of the deep-sea turbidite sandstone to be evaluated.

[0043] In a third aspect, an embodiment of the present application provides an electronic device, including:

[0044] processor;

[0045] Memory;

[0046] and a computer program, wherein the computer program is stored in the memory, and the computer program includes instructions, which, when executed by the processor, enable the electronic device to perform any one of the methods described in the first aspect.

[0047] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored program, wherein the device where the computer-readable storage medium is located in the time and space where the program is running executes any one of the methods described in the first aspect.

[0048] In the embodiment of the present application, compared with the "well-constrained deep-sea turbidite sandstone updip pinch-out lithologic trap identification technology", the present invention does not require drilling / logging data as a constraint condition, is suitable for working conditions with no wells / few wells, and has stronger applicability.

[0049] Furthermore, the present invention uses "deep-sea turbidite sandstones with 'wedge-shaped, medium-strong amplitude, low frequency, low continuity, and chaotic reflection' seismic reflection characteristics" as an example. By tracing and comparing the top and bottom envelope surfaces and formation thickness of the deep-sea turbidite sandstones, the present invention ultimately determines the development location and area of ​​updip pinch-out lithologic traps in the deep-sea turbidite sandstones based on the pinch-out line of the deep-sea turbidite sandstones and the structural contour map of the bottom envelope surface of the deep-sea turbidite sandstones. On this basis, deep-sea turbidite sandstones that "reach a predetermined thickness and exhibit a dome-shaped convex profile seismic reflection profile" are obtained, and the development location and area of ​​"favorable updip pinch-out lithologic traps in the deep-sea turbidite sandstones" are further determined. Therefore, the present invention has significant practical significance for finding favorable updip pinch-out lithologic traps in deep-sea turbidite sandstones suitable for drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0051] Figure 1A schematic flow chart of a method for identifying lithologic traps in turbidite sandstones provided in an embodiment of the present application;

[0052] Figure 2 A schematic diagram of a seismic profile along the source direction provided in an embodiment of the present application;

[0053] Figure 3 A schematic diagram of a seismic profile perpendicular to the source direction provided in an embodiment of the present application;

[0054] Figure 4 A schematic diagram of the thickness of a deep-sea turbidite sandstone to be evaluated provided in an embodiment of the present application;

[0055] Figure 5 A schematic diagram of an updip pinch-out lithologic trap provided in an embodiment of the present application;

[0056] Figure 6 A schematic diagram of a seismic profile with typical seismic reflection characteristics in the vertical direction of the source provided in an embodiment of the present application

[0057] Figure 7 A structural block diagram of a well-free deep-sea turbidite sandstone lithologic trap identification device provided in an embodiment of the present application;

[0058] Figure 8 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0059] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0060] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0061] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0062] It should be understood that the term "and / or" as used herein simply describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A alone, A and B together, or B alone. Furthermore, the character " / " in this document generally indicates an "or" relationship between the associated objects.

[0063] The existing "method for identifying updip pinch-out lithologic traps in deep-sea turbidite sandstones"—a well-constrained technique for identifying updip pinch-out lithologic traps in deep-sea turbidite sandstones—relies on drilling and logging data. Consequently, existing techniques are difficult to apply to well-free or low-well conditions, resulting in a low success rate for deepwater oil and gas exploration.

[0064] To address the above issues, this application provides a method for identifying turbidite sandstone lithologic traps. This method uses the pinch-out line of deep-sea turbidite sandstones and the structural contour map of the deep-sea turbidite sandstone bottom envelope to ultimately determine the location and area of ​​updip pinch-out lithologic traps in deep-sea turbidite sandstones. Based on this, deep-sea turbidite sandstones that reach a predetermined thickness and exhibit a dome-shaped convex seismic reflection profile are identified, allowing the location and area of ​​favorable updip pinch-out lithologic traps to be determined.

[0065] To further clarify the technical content and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and an example of an updip pinch-out lithologic trap in the Upper Cretaceous deep-sea turbidite sandstone of the Bodhiguar Basin, Brazil. It should be noted that, unless otherwise defined, the relevant terms used in this invention are technical terms that are understood by persons of ordinary skill in the art to which this invention belongs, and are described in detail below with reference to the accompanying drawings.

[0066] See also Figure 1 , is a flow chart of a method for identifying lithologic traps in turbidite sandstones provided in an embodiment of the present application. Figure 1 As shown, it mainly includes the following steps.

[0067] Step S101: Based on 3D seismic data, a seismic profile of the deep-sea turbidite sandstone to be evaluated is obtained to determine the seismic facies characteristics of the deep-sea turbidite sandstone to be evaluated.

[0068] In an embodiment of the present application, 3D seismic data is first used to obtain seismic profiles in the provenance direction and perpendicular to the source direction of the deep-sea turbidite sandstone to be evaluated; based on the seismic profiles in the provenance direction and perpendicular to the source direction of the deep-sea turbidite sandstone to be evaluated, the seismic phase characteristics of the deep-sea turbidite sandstone to be evaluated are determined; the seismic phase characteristics include the external morphology of seismic reflections, physical seismological parameters and internal structure.

[0069] Among them, the external shapes of seismic reflections include wedge-shaped, hillock-shaped, sheet-shaped and lens-shaped shapes. The external shape of seismic reflections is determined according to the external characteristics of the deep-sea turbidite sandstone seismic phase to be evaluated; the physical seismological parameters of seismic reflections include: the seismic reflection amplitude determined by the color depth of the seismic reflection layer, the seismic reflection frequency determined by the thickness of a single seismic reflection layer, and the seismic reflection continuity determined by the lateral continuity of the seismic reflection layer; the internal structure of seismic reflections includes parallel and sub-parallel structures, chaotic structures, filling structures and hillock-shaped structures; the internal structure of seismic reflections is determined according to the superposition relationship of the seismic reflection phase axes that constitute the deep-sea turbidite sandstone seismic phase to be evaluated.

[0070] Figure 2 The figure shows the seismic profile along the source direction. Figure 3 Shown is a schematic diagram of the seismic profile perpendicular to the source direction.

[0071] Taking the updip pinch-out lithologic trap of deep-sea turbidite sandstone in the Upper Cretaceous in the Bodhiguar Basin, Brazil as an example, 3D seismic data were used to obtain typical seismic sections in the provenance direction and perpendicular direction of the Upper Cretaceous in the Bodhiguar Basin, Brazil. Figure 2 and Figure 3 On the seismic profile shown, seismic phase characteristics with "'wedge-shaped' external morphology, 'medium-strong amplitude-low frequency-low continuity' physical seismological parameters and 'chaotic' internal structure" are identified. These seismic phase units characterized by "wedge-shaped, medium-strong amplitude-low frequency-low continuity, and chaotic reflection" are block flow deposits formed by rapid accumulation of large-scale gravity flow; these block flow deposits locally contain seismic phases characterized by "strong amplitude-low frequency-continuity", which are deep-sea turbidite sandstones formed by block flow action.

[0072] Step S102: using a seismic facies feature similarity comparison method, tracking and comparing the top envelope surface and the bottom envelope surface of the seismic facies corresponding to the deep-sea turbidite sandstone to be evaluated;

[0073] In the specific implementation, first, based on the determined seismic phase characteristics of the deep-sea turbidite sandstone to be evaluated, the top envelope surface and the bottom envelope surface of the seismic reflection with the same or similar seismic phase characteristics are determined; then, the seismic phase characteristic similarity comparison method is used to regionally track and compare the top envelope surface and the bottom envelope surface with the same seismic phase in the direction of provenance and perpendicular to the provenance, respectively, to achieve three-dimensional spatial closure.

[0074] In the embodiment of the present application, it should be noted that the top envelope surface is the top interface. Figure 2 The double-dotted line shown in the figure shows the bottom envelope surface, which is the bottom interface. Figure 2 Solid line shown.

[0075] Based on the identification of block flow deposits characterized by "wedge-shaped, medium-strong amplitude, low frequency, low continuity, and chaotic reflections", the top and bottom envelope surfaces with the same or similar seismic phase characteristics are determined. Using the similarity comparison method, the top and bottom interfaces of block flow deposits with the same seismic reflection characteristics are regionally tracked, interpreted, and compared by computer in the entire 3D seismic data volume, and three-dimensional space closure is achieved.

[0076] Step S103: determining a pinch-out line of the deep-sea turbidite sandstone to be evaluated based on a difference between a bottom envelope depth and a top envelope depth of the seismic facies corresponding to the deep-sea turbidite sandstone to be evaluated, wherein the pinch-out line of the deep-sea turbidite sandstone to be evaluated is an envelope line where the formation thickness decreases to zero;

[0077] In a specific implementation, the depths of the bottom envelope surface and the top envelope surface are first measured respectively; then, based on the difference between the depths of the bottom envelope surface and the top envelope surface, a plane thickness contour map of the deep-sea turbidite sandstone to be evaluated is determined; and step S103 is executed to obtain an envelope line where the formation thickness decreases to zero. The envelope line where the formation thickness decreases to zero is the pinch-out line of the deep-sea turbidite sandstone to be evaluated.

[0078] In a possible implementation, based on the difference between the depth of the bottom envelope surface and the depth of the top envelope surface of the deep-sea turbidite sandstone, a computer is used to draw the following Figure 4 The plane contour map of the deep-sea turbidite sandstone to be evaluated is shown. On the plane contour map of the deep-sea turbidite sandstone to be evaluated, the "envelope line where the formation thickness decreases to zero" is determined based on the value of the contour line. This "envelope line where the formation thickness decreases to zero" is the pinch-out line of the deep-sea turbidite sandstone to be evaluated. The pinch-out line of the deep-sea turbidite sandstone to be evaluated is Figure 4 The double-dotted line is used to indicate that the deep-sea turbidite sandstone to be evaluated is a mass flow deposit.

[0079] Step S104: determining the development position and closure position of the updip pinch-out lithologic trap of the deep-sea turbidite sandstone to be evaluated based on the structural contour map of the bottom envelope surface;

[0080] In a specific implementation, first, a structural contour map of the bottom envelope surface of the deep-sea turbidite sandstone to be evaluated is determined based on the measured depth value of the bottom envelope surface, and a pinch-out line of the deep-sea turbidite sandstone to be evaluated is projected onto the structural contour map of the bottom envelope surface; then, based on whether the values ​​of the structural contour lines of the bottom envelope surface enclosed by the pinch-out line of the deep-sea turbidite sandstone to be evaluated decrease in the direction of thinning of the formation thickness, the development position and trap area of ​​the updip pinch-out trap of the deep-sea turbidite sandstone to be evaluated are determined;

[0081] If the values ​​of the bottom envelope structural contour lines enclosed by the pinch-out line of the deep-sea turbidite sandstone to be evaluated decrease along the direction of thinning of the formation thickness, the area enclosed by the pinch-out line of the deep-sea turbidite sandstone to be evaluated is the development location of the updip pinch-out lithologic trap of the deep-sea turbidite sandstone to be evaluated, and the area of ​​the area enclosed by the pinch-out line of the deep-sea turbidite sandstone to be evaluated is the closed area of ​​the updip pinch-out lithologic trap of the deep-sea turbidite sandstone to be evaluated;

[0082] If the values ​​of the bottom envelope structural contour lines enclosed by the pinch-out lines of the deep-sea turbidite sandstone to be evaluated do not decrease in the direction of thinning of the formation thickness, the deep-sea turbidite sandstone to be evaluated is not developed and there is no updip pinch-out lithologic trap.

[0083] In one possible implementation, a structural contour map of the bottom envelope of the deep-sea turbidite sandstone to be evaluated is drawn using a computer according to the depth of the bottom envelope; Figure 5 As shown in the figure, the pinch-out line of the deep-sea turbidite sandstone to be evaluated is projected onto the bottom envelope structure contour map of the deep-sea turbidite sandstone to be evaluated. Figure 5 In the schematic diagram shown, find the area where the structural contour line value enclosed by the pinch-out line of the deep-sea turbidite sandstone to be evaluated decreases in the direction of the thinning of the formation thickness. The development position of this area is the development position of the up-dip pinch-out lithologic trap of the deep-sea turbidite sandstone to be evaluated. The area of ​​this area is the closed area of ​​the up-dip pinch-out lithologic trap of the deep-sea turbidite sandstone to be evaluated. In this embodiment, Figure 5 The gray area shown in the figure is the area where the structural contour line value decreases along the direction of stratum thinning, and the closed area is 52.29 km. 2 .

[0084] Step S105: obtaining the external morphology of the seismic reflection corresponding to the deep-sea turbidite sandstone to be evaluated in the updip pinch-out lithologic trap according to the seismic profile of the deep-sea turbidite sandstone to be evaluated;

[0085] Step S106: Determine the development location and closed area of ​​favorable updip pinch-out lithologic traps of deep-sea turbidite sandstones based on the external morphology of the seismic reflection corresponding to the deep-sea turbidite sandstones to be evaluated and the updip lithologic traps of the deep-sea turbidite sandstones to be evaluated.

[0086] Specifically, according to the external morphology of the seismic reflection corresponding to the deep-sea turbidite sandstone to be evaluated in the up-dip pinch-out lithologic trap, the seismic reflection unit of the deep-sea turbidite sandstone to be evaluated with a preset thickness and a reduced hillock-shaped top convex profile is determined. Figure 6The schematic diagram shown is the position enclosed by the double-dotted line; then, the plane distribution range of the deep-sea turbidite sandstone seismic reflection unit to be evaluated, which reaches a preset thickness and has a reduced hillock-shaped top convex profile, is obtained. The plane distribution range of the deep-sea turbidite sandstone seismic reflection unit to be evaluated and the intersection area of ​​the up-dip pinch-out lithologic trap of the deep-sea turbidite sandstone to be evaluated are obtained. The intersection area is the development position of the up-dip pinch-out lithologic trap of the deep-sea turbidite sandstone, and the area of ​​the intersection area is the closed area of ​​the up-dip pinch-out lithologic trap of the deep-sea turbidite sandstone. In the embodiment of the present application, as shown in FIG. Figure 6 The dark grey area shown has a closed area of ​​30.25 km 2 ; The preset thickness is specifically at least 50m.

[0087] In the present embodiment, based on the tracking and comparison of the top and bottom envelope surfaces and formation thickness of deep-sea turbidite sandstones, the location and area of ​​updip pinch-out lithologic traps in deep-sea turbidite sandstones were ultimately determined based on the pinch-out line and the structural contour map of the bottom envelope surface. This approach enabled the identification of deep-sea turbidite sandstones that "reached a predetermined thickness and exhibited a dome-shaped, convex-shaped seismic reflection profile," and further determined the location and area of ​​favorable updip pinch-out lithologic traps in deep-sea turbidite sandstones. This method has significant practical significance for identifying favorable updip pinch-out lithologic traps in deep-sea turbidite sandstones suitable for drilling.

[0088] Corresponding to the above embodiment, the present application also provides a turbidite sandstone lithologic trap identification device.

[0089] See also Figure 7 , which is a structural block diagram of a deep-sea turbidite sandstone lithologic trap identification device without well constraints provided in this application. Figure 7 As shown, it mainly includes the following modules.

[0090] Seismic facies feature acquisition module 701: used to acquire a seismic profile of the deep-sea turbidite sandstone to be evaluated based on 3D seismic data, and determine the seismic facies feature of the deep-sea turbidite sandstone to be evaluated;

[0091] Seismic facies feature comparison module 702: used to track and compare the top envelope surface and the bottom envelope surface of the seismic facies corresponding to the deep-sea turbidite sandstone to be evaluated;

[0092] The pinch-out line acquisition module 703 is configured to determine the pinch-out line of the deep-sea turbidite sandstone to be evaluated based on the difference between the bottom envelope surface depth and the top envelope surface depth of the seismic facies corresponding to the deep-sea turbidite sandstone to be evaluated. The pinch-out line of the deep-sea turbidite sandstone to be evaluated is the envelope line where the formation thickness decreases to zero.

[0093] The first development position and closure position acquisition module 704 is used to determine the development position and closure position of the updip pinch-out lithologic trap of the deep-sea turbidite sandstone to be evaluated based on the structural contour map of the bottom envelope surface;

[0094] Seismic reflection external morphology acquisition module 705: for acquiring the external morphology of seismic reflection corresponding to the deep-sea turbidite sandstone to be evaluated in the updip pinch-out lithologic trap according to the seismic profile of the deep-sea turbidite sandstone to be evaluated;

[0095] The second development position and closure position acquisition module 706 determines the development position and closure area of ​​the updip pinch-out lithologic trap of the deep-sea turbidite sandstone according to the external morphology of the seismic reflection corresponding to the deep-sea turbidite sandstone to be evaluated and the updip lithologic trap of the deep-sea turbidite sandstone to be evaluated.

[0096] It should be pointed out that the specific contents involved in the embodiments of the present application can be found in the description of the above method embodiments. For the sake of brevity, they will not be repeated here.

[0097] Corresponding to the above embodiment, an embodiment of the present application further provides an electronic device.

[0098] See also Figure 8 , is a structural diagram of an electronic device provided in an embodiment of the present application. Figure 8 As shown, the electronic device 800 may include: a processor 801, a memory 802, and a communication unit 803. These components communicate via one or more buses. Those skilled in the art will appreciate that the electronic device structure shown in the figure does not limit the embodiments of the present application. It may be a bus structure or a star structure, and may include more or fewer components than shown, or combine certain components, or arrange the components differently.

[0099] The communication unit 803 is used to establish a communication channel so that the electronic device can communicate with other devices.

[0100] The processor 801 is the control center of the electronic device. It uses various interfaces and lines to connect various parts of the entire electronic device. It runs or executes software programs and / or modules stored in the memory 802, and calls data stored in the memory to perform various functions of the electronic device and / or process data. The processor can be composed of an integrated circuit (IC), for example, it can be composed of a single packaged IC, or it can be composed of multiple packaged ICs with the same or different functions. For example, the processor 801 can include only a central processing unit (CPU). In the embodiment of the present application, the CPU can be a single computing core or multiple computing cores.

[0101] The memory 802 is used to store execution instructions of the processor 801. The memory 802 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0102] When the execution instructions in the memory 802 are executed by the processor 801 , the electronic device 800 is enabled to execute part or all of the steps in the above method embodiment.

[0103] Corresponding to the above embodiment, an embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium may store a program, wherein, when the program is executed, the device containing the computer-readable storage medium may be controlled to perform some or all of the steps in the above method embodiment. In a specific implementation, the computer-readable storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

[0104] Corresponding to the above embodiment, an embodiment of the present application further provides a computer program product, which includes executable instructions. When the executable instructions are executed on a computer, the computer executes some or all of the steps in the above method embodiment.

[0105] In the embodiments of the present application, "at least one" refers to one or more, and "more" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0106] Those skilled in the art will appreciate that the various units and algorithm steps described in the embodiments disclosed herein can be implemented using a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0107] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0108] In the several embodiments provided in this application, if any function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of this application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, and other media that can store program code.

[0109] The above description is merely a specific embodiment of the present application. Any person skilled in the art may easily conceive of variations or substitutions within the technical scope disclosed in this application, and such variations or substitutions shall be within the scope of protection of this application. The scope of protection of this application shall be subject to the scope of protection of the claims.

Claims

1. A method for identifying lithologic traps in turbidite sandstones, characterized in that: include: Based on 3D seismic data, a seismic profile of the deep-sea turbidite sandstone to be evaluated is obtained to determine the seismic facies characteristics of the deep-sea turbidite sandstone to be evaluated; Using the seismic facies feature similarity comparison method, track and compare the top envelope surface and the bottom envelope surface of the seismic facies corresponding to the deep-sea turbidite sandstone to be evaluated; Determine the pinch-out line of the deep-sea turbidite sandstone to be evaluated based on the difference between the bottom envelope surface depth and the top envelope surface depth of the seismic phase corresponding to the deep-sea turbidite sandstone to be evaluated, wherein the pinch-out line of the deep-sea turbidite sandstone to be evaluated is the envelope line where the formation thickness decreases to zero; Determine the development and closure positions of the updip pinch-out lithologic traps in the deep-sea turbidite sandstone to be evaluated based on the structural contour map of the bottom envelope surface; According to the seismic profile of the updip pinch-out lithologic trap of the deep-sea turbidite sandstone to be evaluated, the external morphology of the seismic reflection corresponding to the deep-sea turbidite sandstone to be evaluated in the updip pinch-out lithologic trap is obtained; Based on the external morphology of the seismic reflection corresponding to the deep-sea turbidite sandstone to be evaluated and the updip lithologic traps of the deep-sea turbidite sandstone to be evaluated, the development position and closure area of ​​the favorable updip pinch-out lithologic traps of the deep-sea turbidite sandstone are determined.

2. The method according to claim 1, characterized in that The method of obtaining a seismic profile of the deep-sea turbidite sandstone to be evaluated based on 3D seismic data and determining the seismic facies of the deep-sea turbidite sandstone to be evaluated includes: Use 3D seismic data to obtain seismic profiles of the provenance and vertical source directions of deep-sea turbidite sandstones to be evaluated; The seismic phase characteristics of the deep-sea turbidite sandstone to be evaluated are determined based on the seismic profile in the provenance direction and the perpendicular source direction of the deep-sea turbidite sandstone to be evaluated; the seismic phase characteristics include the external morphology of seismic reflection, physical seismological parameters and internal structure.

3. The method according to claim 2, characterized in that The external shapes of the seismic reflection include wedge-shaped, hillock-shaped, sheet-shaped and lens-shaped shapes, and the external shapes of the seismic reflection are determined according to the external characteristics of the deep-sea turbidite sandstone seismic phase to be evaluated; the physical seismological parameters of the seismic reflection include: the seismic reflection amplitude determined according to the color depth of the seismic reflection layer, the seismic reflection frequency determined according to the thickness of a single seismic reflection layer, and the seismic reflection continuity determined by the lateral continuity of the seismic reflection layer; the internal structure of the seismic reflection includes parallel and sub-parallel structures, chaotic structures, filling structures and hillock-shaped structures; the internal structure of the seismic reflection is determined according to the superposition relationship of the seismic reflection phase axes constituting the deep-sea turbidite sandstone seismic phase to be evaluated.

4. The method according to claim 1, wherein The seismic facies feature similarity comparison method is used to track and compare the top envelope surface and the bottom envelope surface of the seismic facies corresponding to the deep-sea turbidite sandstone to be evaluated, including: Based on the determined seismic facies characteristics of the deep-sea turbidite sandstone to be evaluated, determining the top envelope surface and the bottom envelope surface of the seismic reflection having the same or similar seismic facies characteristics; The seismic phase feature similarity comparison method is used to track and compare the top and bottom envelope surfaces with the same seismic phase in the directions along and perpendicular to the provenance, respectively, to achieve three-dimensional space closure.

5. The method according to claim 1, wherein Determining the pinch-out line of the deep-sea turbidite sandstone to be evaluated based on the difference between the bottom envelope surface depth and the top envelope surface depth of the seismic phase corresponding to the deep-sea turbidite sandstone to be evaluated includes: measuring the depths of the bottom envelope surface and the top envelope surface respectively; Determining a plane thickness contour map of the deep-sea turbidite sandstone to be evaluated based on the difference between the depth of the bottom envelope surface and the depth of the top envelope surface; According to the values ​​of the contour lines on the plane thickness contour map, an envelope line where the formation thickness decreases to zero is obtained. The envelope line where the formation thickness decreases to zero is the pinch-out line of the deep-sea turbidite sandstone to be evaluated.

6. The method according to claim 1, characterized in that Determining the development position and closure position of the updip pinch-out lithologic trap of the deep-sea turbidite sandstone to be evaluated based on the structural contour map of the bottom envelope surface includes: Determining a structural contour map of the bottom envelope of the deep-sea turbidite sandstone to be evaluated based on the measured depth value of the bottom envelope; Projecting the pinch-out line of the deep-sea turbidite sandstone to be evaluated onto the structural contour map of the bottom envelope surface; Determine the development location and area of ​​the updip pinch-out trap of the deep-sea turbidite sandstone to be evaluated based on whether the values ​​of the bottom envelope structural contour lines enclosed by the pinch-out line of the deep-sea turbidite sandstone to be evaluated decrease in the direction of stratum thinning; The determination of the development position and closure of the updip pinch-out trap of the deep-sea turbidite sandstone to be evaluated based on whether the values ​​of the bottom envelope structural contour lines enclosed by the pinch-out line of the deep-sea turbidite sandstone to be evaluated decrease in the direction of thinning of the formation thickness includes: If the values ​​of the bottom envelope structural contour lines enclosed by the proposed deep-sea turbidite sandstone pinch-out line decrease in the direction of stratum thinning, the area enclosed by the proposed deep-sea turbidite sandstone pinch-out line is the development location of the proposed deep-sea turbidite sandstone updip pinch-out lithologic trap, and the area of ​​the area enclosed by the proposed deep-sea turbidite sandstone pinch-out line is the closed area of ​​the proposed deep-sea turbidite sandstone updip pinch-out lithologic trap. If the values ​​of the bottom envelope structural contour lines enclosed by the pinch-out line of the deep-sea turbidite sandstone to be evaluated do not decrease in the direction of thinning of the formation thickness, then the deep-sea turbidite sandstone to be evaluated is not developed and there is no updip pinch-out lithologic trap.

7. The method according to claim 1, characterized in that The above-mentioned method determines the development location and closed area of ​​the updip pinch-out lithologic trap of the deep-sea turbidite sandstone based on the external morphology of the seismic reflection corresponding to the deep-sea turbidite sandstone to be evaluated and the updip lithologic trap of the deep-sea turbidite sandstone to be evaluated, including: Determine a seismic reflection unit of the proposed deep-sea turbidite sandstone having a preset thickness and a reduced dome-shaped top convex profile according to the external morphology of the corresponding seismic reflection of the proposed deep-sea turbidite sandstone in the up-dip pinch-out lithologic trap; Obtaining the plane distribution range of the deep-sea turbidite sandstone seismic reflection unit to be evaluated that reaches a preset thickness and has a reduced dome-shaped top convex profile, The intersection area of ​​the planar distribution range of the deep-sea turbidite sandstone seismic reflection unit to be evaluated and the updip pinch-out lithologic trap of the deep-sea turbidite sandstone to be evaluated is the development location of the favorable updip pinch-out lithologic trap of the deep-sea turbidite sandstone, and the area of ​​the intersection area is the closed area of ​​the favorable updip pinch-out lithologic trap of the deep-sea turbidite sandstone.

8. A well-free deep-sea turbidite sandstone lithologic trap identification device, characterized in that: include: Seismic phase feature acquisition module: used to obtain the seismic profile of the deep-sea turbidite sandstone to be evaluated based on 3D seismic data, and determine the seismic phase features of the deep-sea turbidite sandstone to be evaluated; Seismic phase feature comparison module: used to track and compare the top envelope surface and the bottom envelope surface of the seismic phase corresponding to the deep-sea turbidite sandstone to be evaluated; a pinch-out line acquisition module, configured to determine the pinch-out line of the deep-sea turbidite sandstone to be evaluated based on the difference between the bottom envelope surface depth and the top envelope surface depth of the seismic phase corresponding to the deep-sea turbidite sandstone to be evaluated, wherein the pinch-out line of the deep-sea turbidite sandstone to be evaluated is the envelope line where the formation thickness decreases to zero; A first development position and closure position acquisition module is used to determine the development position and closure position of the updip pinch-out lithologic trap of the deep-sea turbidite sandstone to be evaluated based on the structural contour map of the bottom envelope surface; A seismic reflection external morphology acquisition module is used to acquire the external morphology of seismic reflection corresponding to the deep-sea turbidite sandstone to be evaluated in the updip pinch-out lithologic trap according to the seismic profile of the deep-sea turbidite sandstone to be evaluated; The second development position and closure position acquisition module: determines the development position and closure area of ​​the favorable deep-sea turbidite sandstone updip pinch-out lithologic trap based on the external morphology of the seismic reflection corresponding to the deep-sea turbidite sandstone to be evaluated and the updip lithologic trap of the deep-sea turbidite sandstone to be evaluated.

9. An electronic device, characterized in that: include: processor; Memory; and a computer program, wherein the computer program is stored in the memory, and the computer program includes instructions, which, when executed by the processor, enable the electronic device to perform the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium includes a stored program, wherein the device where the computer-readable storage medium is located during the execution of the program executes the method according to any one of claims 1 to 7.

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