Method for identifying backflushing anticlinal trap of ancient buried hill in broken basin

Abstract

The invention belongs to the technical field of oil exploration, and discloses a fault basin ancient buried hill recoil anticlinal trap identification method, which comprises the following steps: acquiring a fault basin three-dimensional seismic data volume containing stratigraphic position data; a seismic section is selected in the direction basically perpendicular to the stretching direction of the fault basin, and the thrust fault is recognized. And selecting a seismic section and an earthquake isochronous slice of the uplift tray of the thrust fault, and identifying the thrust anticline structure of the ancient buried hill. And judging whether the ancient buried hill recoil anticline structure develops a weathering crust reservoir stratum and an upper covering layer at the same time or not, and if yes, identifying the ancient buried hill recoil anticline trap of the broken basin as an effective broken basin. According to the method, the seismic section is selected in the direction basically perpendicular to the extending direction of the broken basin, and the recognition success rate of the hidden thrust fault in the ancient buried hill can be increased. The method of combining the seismic section and the seismic isochronous slice is adopted to recognize the backflushing and anticline structure, and the recognition accuracy of the backflushing and anticline of the ancient buried hill is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of petroleum exploration, and more specifically, to a method for identifying anticline traps of ancient buried hills in fault basins. Background Art

[0002] With the development of seismic exploration technology, clearer seismic data provide rich information for the detection of oil and gas traps. Specific trap morphology can be identified in the 3D seismic data body, and then the relationship between the location of source rocks and traps can be determined based on logging information and geophysical information, so that oil and gas traps can be accurately located.

[0003] Ancient buried hills have a significant controlling effect on oil and gas accumulation. Ancient buried hills are ancient topographic protrusions that have been weathered and eroded for a long time and are covered by impermeable rock layers to form closure conditions. Together with the fault system, they can constitute a dominant channel for oil and gas migration. They can also be configured with thin and narrow reservoirs to form a structural-lithological composite closure, providing a tolerant space for oil and gas accumulation.

[0004] The buried hill thrust anticline trap formed by the late transformation of the buried hill in the fault basin refers to the trap formed by the strong transformation of the buried hill formed in the early stage by the thrust fault. Due to the dual effects of compression and stretching and erosion, the buried hill thrust anticline oil and gas traps formed are relatively hidden, difficult to identify and discover, and easy to miss using conventional exploration theories and technologies. According to the seismic data of the buried hill thrust fault in the fault basin, there are few breakpoints and small fault throws, and the characteristics are hidden. At present, it is difficult to identify the thrust fault by the seismic interpretation method; the seismic reflection of the buried hill in the fault basin is relatively vague, and coupled with the strong tectonic changes in the later period, it is very difficult to identify the buried hill thrust anticline trap.

[0005] In view of this, there is an urgent need to provide an identification method for ancient buried hill thrust anticline traps in fault basins, so as to quickly and accurately predict ancient buried hill thrust anticline traps. Summary of the invention

[0006] In order to at least solve one or more of the technical problems mentioned above, the present invention provides a method for identifying an ancient buried hill thrust anticline trap in a fault basin, comprising: a first step, obtaining a three-dimensional seismic data volume of the fault basin containing stratigraphic data; a second step, selecting a seismic profile in a direction substantially perpendicular to the extension direction of the fault basin to identify the thrust fault; a third step, selecting a seismic profile and a seismic isochronous slice of the upthrust disk of the thrust fault to identify the ancient buried hill thrust anticline structure; a fourth step, judging whether the ancient buried hill thrust anticline structure simultaneously develops a weathering crust reservoir layer and an overburden layer, and if so, identifying it as an effective ancient buried hill thrust anticline trap in a fault basin, wherein the weathering crust reservoir layer is identified by the following characteristics: the top surface of the ancient buried hill thrust anticline structure presents onlap and erosion, and the upper porosity of the ancient buried hill thrust anticline structure is greater than 5%, and the permeability is greater than 0.01 md 2Among them, the overburden is identified by the following characteristics: at least covering the ancient buried hill anticline structure, thickness> 20m, and the lithology is mudstone, salt rock or gypsum.

[0007] According to one embodiment of the present invention, in the second step, the basis for identifying the thrust fault includes: discontinuity points in the seismic reflection axis, fault waves and seismic velocity reversal characteristics.

[0008] According to one embodiment of the present invention, substantially vertical includes: an angle of 80-100 degrees with the extension direction of the fault basin.

[0009] According to one embodiment of the present invention, in the second step, the seismic profiles are multiple and parallel to each other, and the spacing between the seismic profiles is set to the survey line spacing or an integer multiple of the survey line spacing.

[0010] According to one embodiment of the present invention, in the third step, the basis for identifying the ancient buried hill thrust anticline includes: identifying a preliminary structure with a seismic phase axis that is in the shape of an uplift on the seismic profile; and identifying a preliminary structure that is ring-shaped and gradually increases with increasing depth on the seismic isochronal slice as the ancient buried hill thrust anticline structure.

[0011] According to one embodiment of the present invention, in the third step, the seismic profile of the upthrust disk of the thrust fault is selected by rotating the selected seismic profile at a preset angle to identify the primary structure. Preferably, the preset angle includes any value between 2° and 10°.

[0012] According to one embodiment of the present invention, in the third step, the seismic isochronal slices of the upthrust disk of the thrust fault are selected in the following manner: preliminary structural seismic isochronal slices are continuously selected from shallow to deep to identify the ancient buried hill thrust anticline structure.

[0013] According to one embodiment of the present invention, in the fourth step, the development of weathering crust reservoir is determined by: intercepting the seismic profile of the ancient buried hill thrust anticline structure at multiple angles to identify onlap and erosion; determining the porosity and permeability based on the correspondence between the lithology data of the ancient buried hill drilled in the adjacent area of ​​the fault basin and the stratigraphic positions of the ancient buried hill thrust anticline structure.

[0014] According to one embodiment of the present invention, in the fourth step, the development of the overlying layer is determined by the following method: based on the lithology data of the ancient buried hill drilled in the adjacent area of ​​the fault basin and the correspondence with the overlying strata of the ancient buried hill thrust anticline structure, the thickness, range and lithology of the overlying strata are determined.

[0015] In the present invention, by selecting a seismic profile in a direction substantially perpendicular to the extension direction of the fault basin, the success rate of identifying hidden thrust faults in the ancient buried hill can be improved.

[0016] In the present invention, a method combining seismic profiles and seismic isochronal slices is adopted to identify thrust anticline structures on the upthrust plate of the thrust fault, thereby improving the accuracy of identifying thrust anticlines in ancient buried hills.

[0017] In the present invention, the anticline structure is screened by setting specific reservoir conditions and cap rock conditions, so that the obtained ancient buried hill thrust anticline trap in the fault basin has better effectiveness and can improve the success rate of exploration. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0019] Figure 1 A schematic diagram of a three-dimensional seismic survey system is shown;

[0020] Figure 2 A schematic diagram showing the steps of the method for identifying anticline traps in ancient buried hills in fault basins;

[0021] Figure 3 A schematic diagram of identifying a fault basin in a three-dimensional seismic data volume is shown;

[0022] Figure 4 A schematic diagram of a seismic section containing a thrust fault is shown. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0024] It should be understood that the terms "include" and "comprises" used in the description and claims of the present invention indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0025] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the claims, the singular forms of "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It should also be further understood that the term "and / or" used in the specification of the present invention and the claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0026] As used in this specification and claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0027] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0028] Figure 1 A schematic diagram of a three-dimensional seismic survey system is shown.

[0029] like Figure 1 As shown, in the system 100, a plurality of mutually spaced detectors 110 for detecting seismic waves are arranged on the surface 101 of the exploration target area, forming a detector array covering the target area on a plane. These detectors 110 are connected to the seismic information processing device by wired or wireless connection, and a plurality of seismic sources 120 are also provided. The seismic information processing device can perform preliminary processing on the seismic data. The working process of the three-dimensional seismic exploration system is: artificially excite the seismic sources 120 located at multiple positions to generate seismic waves, which are reflected from the boundary of the stratum 102 and received by the detector array to form seismic information collected on a plane and changing with time. The seismic information received by the detector array represents certain measures of seismic wave energy as a function of time, such as displacement, velocity, wave impedance, pressure, etc. This information can be grouped in different ways, such as traces, sets, etc., and then processed or format-converted according to the corresponding relationship between time and space to form a three-dimensional seismic data body in the form of a three-dimensional array. It can also be said that the three-dimensional seismic data body is formed by stacking interface points in space. The interpretation of three-dimensional seismic data can observe the morphology of geological interfaces from different directions and study the changes of geological bodies in three-dimensional space by cutting cross sections, longitudinal sections and horizontal slices.

[0030] In the stratigraphic model, the stratigraphic layer 102 includes faults. Faults refer to the phenomenon that the stratigraphic layer undergoes relative displacement along the fracture surface and are a byproduct of tectonic activity. Faults play a very important role in controlling the migration, accumulation or destruction of oil and gas, and are closely related to the formation, distribution and enrichment of oil and gas traps in the ancient buried hill thrust anticline, and are important migration channels.

[0031] Figure 2 A schematic diagram showing the steps of a method for identifying anticline traps in ancient buried hills in fault basins.

[0032] like Figure 2 As shown, the identification method 200 of the ancient buried hill thrust anticline trap in the fault basin includes: the first step S201, obtaining the three-dimensional seismic data volume of the fault basin containing the stratigraphic layer data. The second step S202, selecting the seismic profile in the direction substantially perpendicular to the extension direction of the fault basin to identify the thrust fault. The third step S203, selecting the seismic profile and seismic isochronous slice of the upthrust plate of the thrust fault to identify the ancient buried hill thrust anticline structure. The fourth step S204, judging whether the ancient buried hill thrust anticline structure has developed weathering crust reservoir and overburden at the same time, if so, it is identified as a valid ancient buried hill thrust anticline trap in the fault basin, wherein the weathering crust reservoir is identified by the following characteristics: the top surface of the ancient buried hill thrust anticline structure presents onlap and erosion, and the upper porosity of the ancient buried hill thrust anticline structure is greater than 5%, and the permeability is greater than 0.01md 2 Among them, the overburden is identified by the following characteristics: at least covering the ancient buried hill anticline structure, thickness> 20m, and the lithology is mudstone, salt rock or gypsum.

[0033] In the present invention, in view of the common situation that ancient buried hill thrust faults in fault basins are relatively hidden, seismic profiles are intercepted in a specific direction to identify thrust faults, and on this basis, effective closures are identified and screened, which can provide accurate reference for oil and gas exploration.

[0034] In the first step S201, the Figure 1 The 3D seismic exploration system in the system acquires high-precision 3D seismic data of the work area, locates it in the fault basin, and interprets and marks the stratigraphic positions of the work area on the 3D seismic data.

[0035] During seismic exploration, seismic structures are usually perpendicular to the inline (main survey line) direction. Therefore, multiple two-dimensional seismic profiles can be taken in the inline (main survey line) and crossline (connection survey line) directions on the three-dimensional seismic data volume to identify the ancient buried hills in the fault basin. The interception density of multiple two-dimensional seismic profiles can be set according to the size of the work area. For example, intercepting two-dimensional profiles with the survey line spacing or its integer multiple as the spacing can present the stratigraphic structure more clearly.

[0036] Thrust faults are a type of fault in geological structures. They are faults in which the upper plate rises and the lower plate falls relatively. They are mainly formed by horizontal compression and gravity. The identification process of thrust faults can be done by extracting features, automatically identifying them through artificial intelligence, or directly calibrating them in the three-dimensional data body manually. Thrust faults are an important factor in the late transformation of ancient buried hills.

[0037] In the second step, since thrust faults in the fault basin are difficult to identify effectively due to their concealment, the present invention selects seismic sections in a direction substantially perpendicular to the extension direction of the fault basin, and then identifies thrust faults on these seismic sections.

[0038] Substantially vertical includes: the angle with the extension direction of the fault basin is 80-100 degrees, preferably 85-95 degrees. When selecting seismic profiles, the seismic profiles can be set to be multiple and parallel to each other, and the spacing between the seismic profiles is set to the survey line spacing or an integer multiple of the survey line spacing. This spacing selection method can avoid the large amount of calculation caused by too dense on the one hand, and avoid omissions on the other hand.

[0039] Specifically, it is necessary to use a variety of features to jointly determine whether there is a thrust fault and the shape of the thrust fault. For example, the basis for identifying a thrust fault includes: breakpoints in the seismic reflection axis, cross-section waves, and seismic velocity reversal characteristics. Breakpoints in the seismic reflection axis generally reflect the location of the cross section. Discretely distributed cross-section waves can be identified along the direction in which the breakpoints extend. Based on these two structures, the basic shape of the cross section can be formed. Finally, the velocity spectrum is used to compare the reversal characteristics of the seismic velocities above and below the cross section to determine the thrust fault. Seismic velocity reversal means that seismic velocity usually increases with depth, but at the location of a thrust fault, due to the thrust effect, the new stratum is located below the old stratum, causing the seismic velocity at this location to decrease with depth.

[0040] In the present invention, the above three characteristics are used together to identify the thrust fault, which can further improve the reliability of the thrust fault identification.

[0041] In addition, when identifying thrust faults, it includes but is not limited to identifying:

[0042] Fault scratches, that is, the relative displacement of the two plates of the fault leaves parallel, fine and uniform scratches on the fault plane, sometimes forming alternating parallel ridges and grooves, which can be used to identify the sliding direction between the upper and lower plates.

[0043] Fault slip surface, that is, the relative displacement of the two plates of the fault causes the temperature on the fault surface to rise, causing some iron, manganese, calcium, silicon and other material powders to remelt and deposit on the fault surface to form a smooth film called fault slip mirror surface. Fault slip surface is more likely to appear on torsional and compression-torsion fault surfaces.

[0044] Steps are small steep steps formed on the fault plane by the relative displacement of the two plates of the fault. Steps often extend perpendicular to the scratch direction but generally do not extend far. Steps are arranged parallel to each other. The direction of the step steepness indicates the direction of movement of the opposite plate.

[0045] Fault tectonic rocks, that is, fault action often forms various tectonic rocks in fault zones. The most common tectonic rocks are fault breccias, in which the breccias have significantly different angles and sizes, and are generally arranged without orientation. The composition of the breccias is the same as that of the two sides of the fault.

[0046] Tectonic lenses, that is, in compressional and compression-torsion fault zones, two sets of conjugate joints are often formed to cut the rock into diamond-shaped blocks, and then slide along the joint plane. The corners are partially or mostly disappeared and the lens shape is called a tectonic lens. The lens is often surrounded by sheet-like minerals to form foliation.

[0047] After extracting the above-mentioned morphology and features, thrust faults are identified on multiple different sections using artificial intelligence recognition or manual recognition.

[0048] In the third step S203, after the thrust fault is identified, the ancient buried hill thrust anticline associated with the thrust fault is identified in the upthrust plate of the thrust fault, specifically, starting from the top of the upthrust plate and extending upward to the top surface of the uplift. The ancient buried hill can form various structural traps and stratigraphic traps. As the ancient terrain has been subjected to weathering, erosion and groundwater dissolution and filtration for a long time, the porosity and permeability of the underlying rock formation, especially the carbonate rock, are greatly increased, and large cracks or caves can be formed.

[0049] In the process of identifying the ancient buried hill thrust anticline, the dependence between the ancient buried hill thrust anticline and the thrust fault can be identified based on the strike of the thrust fault. When the thrust fault is associated with the ancient buried hill structure, it means that there is a high probability that the ancient buried hill thrust anticline oil and gas trap will be formed.

[0050] Specifically, a seismic profile is selected in the upthrust disk area of ​​the thrust fault, and the seismic profile can be rotated at a preset angle to identify the primary structure. Preferably, the preset angle includes any value from 2° to 10°. By adopting the rotation selection method, the area can be scanned in all directions, thereby improving the recognition efficiency of the uplifted structure.

[0051] When selecting seismic isochronous slices, the uplifted structures can be screened within the range of the uplifted structures identified on the seismic profile, thereby reducing the amount of computational data. In the third step, the seismic isochronous slices of the thrust fault uplift disk are selected in the following manner: the seismic isochronous slices of the primary structure are continuously selected from shallow to deep to identify the ancient buried hill thrust anticline structure.

[0052] The basis for identifying the ancient buried hill thrust anticline includes: identifying the preliminary structure with uplifted seismic phase axis on the seismic section; identifying the preliminary structure with ring shape and gradually increasing with depth on the seismic isochronal slice as the ancient buried hill thrust anticline structure.

[0053] After identifying the thrust anticline associated with the thrust fault, the fourth step S204 is entered to determine whether the thrust anticline trap meets the trap conditions: whether there is a reservoir and whether there is a cap rock. A dense cap rock with an effective thickness is one of the reservoir-forming conditions of the thrust anticline. The cap rock should be a lithology with dense strata, such as mudstone, dense sandstone, dense volcanic rock, rock salt, etc. Specifically, based on the lithology data of the buried hills drilled in the neighboring area of ​​the fault basin and the corresponding relationship with the overlying strata of the buried hill thrust anticline structure, the thickness, range and lithology of the overlying strata are determined. For example: based on the stratigraphic age information of the drilled wells in the neighboring area, the three-dimensional seismic data body can be calibrated to determine whether the lithology of the cap rock of the buried hill belongs to mudstone, dense sandstone, dense volcanic rock, rock salt, etc.

[0054] Under the premise that there is a cap rock above the thrust anticline structure, identify whether there is a high-porosity reservoir inside the thrust anticline structure. Specifically, identify the porosity and permeability of the upper part of the ancient buried hill thrust anticline structure. Specifically, intercept the seismic profile of the ancient buried hill thrust anticline structure at multiple angles to identify the onlap and erosion; determine the porosity and permeability based on the corresponding relationship between the lithology data of the ancient buried hill drilled in the adjacent area of ​​the fault basin and the stratigraphic position of the ancient buried hill thrust anticline structure.

[0055] In the present invention, the weathering crust is identified by using the onlap and erosion structures, and the porosity and permeability are used to further confirm the existence of the weathering crust reservoir, which can improve the reliability of reservoir identification.

[0056] This identification process can also be achieved through existing technologies, for example: calibrating seismic information based on well logging information, combining well logging and seismic information, predicting the development degree of hole reservoirs and fracture reservoirs, where the weathering crust has the characteristics of low-frequency strong reflection, and the inner cracks and caves have weak amplitude or chaotic phases, beaded reflection characteristics, which can be directly identified on the profile. The above prediction results are used to quantitatively characterize hole and fracture reservoirs, including permeability, porosity, etc. The preferred reservoir parameters in the embodiment of the present invention are porosity greater than 5%, permeability greater than 0.01md 2 When all the conditions of reservoir and cap rock are met, it is identified as an effective thrust buried hill anticline trap.

[0057] Figure 3 A schematic diagram showing the identification of a fault basin in a 3D seismic data volume is shown.

[0058] like Figure 3As shown, on the three-dimensional seismic data volume, multiple seismic sections are taken along the main survey line and the connecting survey line directions; the strike and extension direction of the fault basin are determined on the seismic sections. For example, on the three-dimensional seismic data volume 310, the main survey line direction is the X-axis direction, and the seismic section 302 is taken, and the direction of the connecting survey line is the Y direction, and the seismic section 301 is taken.

[0059] When identification is performed from a single section, due to the angle factor, there is often a situation where the identification is ambiguous. In the embodiment of the present invention, by identifying separately on two mutually perpendicular sections, the accuracy can be improved, which is conducive to accurately presenting its trend and extension direction.

[0060] Figure 4 A schematic diagram of a seismic section containing a thrust fault is shown.

[0061] On the profile, the cross-section wave 41, the interruption point in the seismic reflection axis, and the cross-section 43 of the ancient buried hill thrust anticline can be identified, and the range of the coexistence of the thrust fault and the thrust anticline can be determined. According to the information of the wells drilled in the adjacent area, the three-dimensional seismic data body is calibrated to determine the lithology and porosity of the cap rock of the ancient buried hill. The wells drilled in the adjacent area refer to test wells, through which basic stratigraphic information, including lithology and porosity, can be obtained. The calibration of the three-dimensional seismic data body by drilling information can be achieved by existing technology, and the present invention will not go into details. The stratigraphic information of a certain local point is obtained by drilling, and then the stratigraphic layer data is used to calibrate the three-dimensional seismic data body, so that the porosity inside the ancient buried hill thrust anticline in the three-dimensional seismic data body is measured, and the ancient buried hill thrust anticline is screened based on the size of the porosity.

[0062] In the present invention, by selecting a seismic profile in a direction substantially perpendicular to the extension direction of the fault basin, the success rate of identifying hidden thrust faults in the ancient buried hill can be improved.

[0063] In the present invention, a method combining seismic profiles and seismic isochronal slices is adopted to identify thrust anticline structures on the upthrust plate of the thrust fault, thereby improving the accuracy of identifying thrust anticlines in ancient buried hills.

[0064] In the present invention, the anticline structure is screened by setting specific reservoir conditions and cap rock conditions, so that the obtained ancient buried hill thrust anticline trap in the fault basin has better effectiveness and can improve the success rate of exploration.

[0065] Although multiple embodiments of the present invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art may conceive of many changes, modifications, and alternatives without departing from the thought and spirit of the present invention. It should be understood that in the process of practicing the present invention, various alternatives to the embodiments of the present invention described herein may be adopted. The appended claims are intended to define the scope of protection of the present invention, and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A method for identifying anticline traps in ancient buried hills in fault basins, characterized in that: include: The first step is to obtain a three-dimensional seismic data volume of a fault basin containing stratigraphic data; The second step is to select seismic sections in a direction substantially perpendicular to the extension direction of the fault basin to identify thrust faults; The third step is to select the seismic profile and seismic isochronal slice of the thrust fault uplift disk to identify the ancient buried hill thrust anticline structure; The fourth step is to determine whether the ancient buried hill thrust anticline structure has developed weathering crust reservoir and overburden at the same time. If so, it is identified as an effective ancient buried hill thrust anticline trap in a fault basin. Among them, the weathering crust reservoir is identified by the following characteristics: the top surface of the ancient buried hill thrust anticline structure shows onlap and erosion, and the upper part of the ancient buried hill thrust anticline structure has a porosity of more than 5% and a permeability of more than 0.01md 2 , Among them, the upper cover layer is identified by the following characteristics: at least covering the ancient buried hill anticline structure, thickness> 20m, and the lithology is mudstone, salt rock or gypsum.

2. The identification method according to claim 1, characterized in that: In the second step, the basis for identifying the thrust fault includes: the discontinuity point in the seismic reflection axis, the fault wave and the seismic velocity reversal characteristics.

3. The identification method according to claim 1, characterized in that: The substantially vertical includes: an angle of 80-100 degrees with the extension direction of the fault basin.

4. The identification method according to claim 3, characterized in that: In the second step, the seismic profiles are multiple and parallel to each other, and the spacing between the seismic profiles is set to the survey line spacing or an integer multiple of the survey line spacing.

5. The identification method according to claim 1, characterized in that: In the third step, the basis for identifying the ancient buried hill thrust anticline includes: identifying a preliminary structure with a seismic phase axis in an uplifted shape on the seismic section; On the seismic isochronal slices, the preliminary selected structures that are ring-shaped and gradually increase in size with increasing depth are identified as the ancient buried hill thrust anticline structures.

6. The identification method according to claim 5, characterized in that: In the third step, the seismic profile of the thrust fault uplift disk is selected in the following manner: The seismic section is rotated at a preset angle to identify the preliminary structure.

7. The identification method according to claim 6, characterized in that: The preset angle includes any value between 2° and 10°.

8. The identification method according to claim 5, characterized in that: In the third step, the seismic isochronous slices of the thrust fault uplift disk are selected in the following manner: The primary structural seismic isochronal slices are continuously selected from shallow to deep to identify the ancient buried hill thrust anticline structure.

9. The identification method according to claim 1, characterized in that: In the fourth step, the weathering crust reservoir is determined by: Seismic sections of the ancient buried hill thrust anticline structure are intercepted at multiple angles to identify onlap and erosion; The porosity and permeability are determined based on the corresponding relationship between the lithology data of the ancient buried hill drilled in the adjacent area of ​​the fault basin and the stratigraphic positions of the thrust anticline structure of the ancient buried hill.

10. The identification method according to claim 1, characterized in that: In the fourth step, the development of the upper covering layer is determined by: Based on the lithology data of the ancient buried hill drilled in the adjacent area of ​​the fault basin and the corresponding relationship with the overlying strata of the thrust anticline structure of the ancient buried hill, the thickness, range and lithology of the overlying strata are determined.

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