Identification method of thrust anticline trap in faulted basin paleo-buried hill

Abstract

The present application belongs to the technical field of petroleum exploration, and discloses a method for identifying a thrust anticline trap of a buried hill in a rift basin, comprising: obtaining a three-dimensional seismic data volume of the rift basin containing stratum horizon data; selecting a seismic profile in a direction substantially perpendicular to the extension direction of the rift basin to identify a thrust fault; selecting a seismic profile and a seismic isochronous slice of the upthrown side of the thrust fault to identify a thrust anticline structure of the buried hill; and judging whether the thrust anticline structure of the buried hill develops a weathering crust reservoir and an overlying layer simultaneously, and if so, identifying the thrust anticline trap of the buried hill in the rift basin as effective. In the present application, the selection of the seismic profile in the direction substantially perpendicular to the extension direction of the rift basin can improve the success rate of identifying the concealed thrust fault in the buried hill. The method of combining the seismic profile and the seismic isochronous slice to identify the thrust anticline structure can improve the identification accuracy of the thrust anticline of the buried hill.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil exploration. More particularly, the present application relates to a method for identifying a thrust anticline trap of a buried hill in a rift basin. BACKGROUND

[0002] With the development of seismic exploration technology, more and more clear seismic data provides rich information for the detection of oil and gas traps. In the three-dimensional seismic data body, specific trap patterns can be identified, and then, in dependence on logging information and geophysical information, the position of the source rock and the relationship between the trap can be determined, so as to accurately locate the oil and gas trap.

[0003] The buried hill has a significant control effect on oil and gas accumulation. The buried hill is a protrusion of a paleotopography due to long-term weathering and erosion, which is covered by an impermeable rock layer to form a trap condition. The buried hill can form an advantage channel for oil and gas migration together with a fault system, and can be configured with a thin and narrow reservoir to form a structural-lithologic composite trap, thereby providing a space for oil and gas accumulation.

[0004] The buried hill thrust anticline trap of a rift basin refers to a trap formed by a buried hill of early formation being strongly reformed by a thrust fault. Due to the double effects of compression and stretching and erosion, the buried hill thrust anticline oil and gas trap formed is relatively concealed and is not easy to identify and discover. The conventional exploration theory and technology are easy to miss. In the rift basin, the buried hill thrust fault breakpoint is few and the fault throw is small on the seismic data, the characteristics are concealed, and the current seismic interpretation method is difficult to identify the thrust fault. The seismic reflection of the buried hill in the rift basin is relatively fuzzy, and the buried hill thrust anticline trap is very difficult to identify due to the strong tectonic changes in the later period.

[0005] Therefore, it is urgent to provide a method for identifying a buried hill thrust anticline trap of a rift basin, so as to quickly and accurately predict the buried hill thrust anticline trap. SUMMARY

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

[0007] According to one embodiment of the present application, in the second step, the basis for identifying the thrust fault comprises: a break point in a seismic reflection axis, a fault wave and a seismic velocity inversion feature.

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

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

[0010] According to one embodiment of the present application, in the third step, the basis for identifying the buried hill thrust anticline comprises: identifying the initial selected structure with the uplifted seismic events on the seismic profile; identifying the initial selected structure as the buried hill thrust anticline structure on the seismic isochronous slice, which is annular and gradually increases with the depth.

[0011] According to one embodiment of the present application, in the third step, the seismic profile of the upthrown side of the thrust fault is selected by rotating the selected seismic profile to identify the initial selected structure at a preset angle. Preferably, the preset angle comprises any value in the range of 2° to 10°.

[0012] According to one embodiment of the present application, in the third step, the seismic isochronous slice of the upthrown side of the thrust fault is selected by continuously selecting the initial selected structure seismic isochronous slice from shallow to deep to identify the buried hill thrust anticline structure.

[0013] According to one embodiment of the present application, in the fourth step, the weathering crust reservoir is determined by: intercepting the seismic profile of the buried hill thrust anticline structure at multiple angles to identify the onlap and erosion; and determining the porosity and permeability according to the corresponding relationship between the buried hill lithology data of the drilling well in the adjacent area of the rift basin and the stratum horizon of the buried hill thrust anticline structure.

[0014] According to one embodiment of the present application, in the fourth step, the overlying layer is determined by: determining the thickness, range and lithology of the overlying stratum according to the corresponding relationship between the buried hill lithology data of the drilling well in the adjacent area of the rift basin and the overlying stratum of the buried hill thrust anticline structure.

[0015] In the present application, by selecting the seismic profile in the direction substantially perpendicular to the extension direction of the rift basin, the success rate of identifying the concealed thrust fault in the buried hill can be improved.

[0016] In the present application, the method of combining seismic profile and seismic isochronous slice is adopted to identify the thrust anticline structure on the upthrown side of the thrust fault, and the identification accuracy of the thrust anticline of the buried hill in the rift basin is improved.

[0017] In the present application, the thrust anticline structure is screened by setting specific reservoir conditions and caprock conditions, so that the thrust anticline trap of the buried hill in the rift basin obtained has better effectiveness, and the success rate of exploration can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which a number of embodiments of the present application are shown by way of example, and wherein like reference numerals refer to like elements throughout. In the drawings:

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

[0020] Figure 2 A schematic diagram of the steps of the identification method of the thrust anticline trap of the buried hill in the rift basin is shown;

[0021] Figure 3 A schematic diagram of the identification of the rift basin in the three-dimensional seismic data volume is shown;

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

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0024] It should be understood that the terms "comprise" and "include" used in the specification and claims of the present application indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or sets thereof.

[0025] It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in this specification and the appended claims, the singular forms "a," "an" and "the" include plural referents unless the context clearly dictates otherwise. It is further to be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items, and that the term "at least one of' as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0026] As used in this specification and claims, the terms "if' and "when" can each be interpreted to mean "upon determination" or "in response to a determination" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [a described condition or event] is detected" can each be interpreted to mean "upon determining" or "in response to determining" or "upon detecting [the described condition or event]" or "in response to detecting [the described condition or event]," depending on the context.

[0027] A detailed description of specific embodiments of the present application is described below with reference to the accompanying drawings.

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

[0029] As Figure 1 shown, in the system 100, a plurality of geophones 110 for detecting seismic waves are arranged on the surface 101 of the target area to be explored, forming a geophone array covering the target area in a plane. The geophones 110 are connected to a seismic information processing device by wired or wireless connection. A plurality of seismic sources 120 are also provided. The seismic information processing device can perform preliminary processing on seismic data. The working process of the three-dimensional seismic exploration system is as follows: artificial excitation of the seismic sources 120 at a plurality of positions generates seismic waves, which are reflected from the boundary of the stratum 102 and received by the geophone array, forming seismic information collected in a plane and changing over time. The seismic information received by the geophone array represents certain measures of seismic wave energy as a function of time, such as displacement, velocity, wave impedance, pressure, etc. These information can be grouped in different ways, such as traces, gathers, etc., and then processed or format-converted according to the corresponding relationship between time and space, forming a three-dimensional seismic data volume in the form of a three-dimensional array, which can also be said to be formed by spatially stacking interface points. Interpretation of the three-dimensional seismic data volume can observe the morphology of the geological interface from different directions, and study the changes of geological bodies in three-dimensional space through cross-sectional, longitudinal sectional and horizontal slice.

[0030] In the stratum model, the stratum 102 contains a fault. The fault refers to a phenomenon that the stratum has a relative displacement along a fracture surface, and is a byproduct of tectonic activity. The fault plays a very important control role in oil and gas migration, accumulation or destruction, and has a very close relationship with the formation, distribution and enrichment of the paleo-buried hill thrust anticline trap, and is an important migration channel.

[0031] Figure 2 A step schematic diagram of the identification method of the fault basin paleo-buried hill thrust anticline trap is shown.

[0032] As shown in Figure 2 , the identification method 200 of the fault basin paleo-buried hill thrust anticline trap includes: a first step S201 of acquiring a three-dimensional seismic data volume of the fault basin containing stratum horizon data. A second step S202 of selecting a seismic profile in a direction substantially perpendicular to the extension direction of the fault basin to identify a thrust fault. A third step S203 of selecting a seismic profile and a seismic isochronous slice of the up-dish of the thrust fault to identify a paleo-buried hill thrust anticline structure. A fourth step S204 of judging whether the paleo-buried hill thrust anticline structure develops a weathering crust reservoir and an overlying layer at the same time, and if so, identifying it as an effective fault basin paleo-buried hill thrust anticline trap, wherein the weathering crust reservoir is identified by the following characteristics: the top surface of the paleo-buried hill thrust anticline structure presents onlap and erosion, and the upper porosity of the paleo-buried hill thrust anticline structure is > 5% and the permeability is > 0.01 md 2 , wherein the overlying layer is identified by the following characteristics: covering at least the paleo-buried hill anticline structure, the thickness is > 20m, and the lithology is mudstone, salt rock or gypsum rock.

[0033] In the present application, in view of the common situation that the paleo-buried hill thrust fault in the fault basin is relatively concealed, the seismic profile is taken in a specific direction to identify the thrust fault, and on this basis, the effective trap is identified and screened, which can provide an accurate reference for oil and gas exploration.

[0034] In the first step S201, the high-precision three-dimensional seismic data volume of the work area is acquired in advance by the three-dimensional seismic exploration system in Figure 1 , positioned in the fault basin, and the stratum horizon of the work area is interpreted and marked on the three-dimensional seismic data volume.

[0035] When seismic exploration is performed, the seismic structure is usually perpendicular to the inline (main line) direction, so a plurality of two-dimensional seismic profiles can be taken in the inline (main line) and crossline (contact line) directions on the three-dimensional seismic data volume to identify the fault basin paleo-buried hill. The cutting density of the plurality of two-dimensional seismic profiles can be set according to the size of the work area, for example, the two-dimensional profiles are taken at an interval of a line spacing or an integer multiple of the line spacing, which can clearly present the stratum structure.

[0036] The thrust fault is a kind of fault in geological structure, and is a fault with the upper wall rising and the lower wall relatively descending, and is mainly formed by horizontal extrusion and gravity. The identification process of the thrust fault can be automatically identified by feature extraction through artificial intelligence, or directly labeled in the three-dimensional data body by artificial. The thrust fault is an important factor for late reconstruction of the buried hill.

[0037] In the second step, due to the concealment of the thrust fault in the rift basin, it is difficult to effectively identify, and the present application selects the seismic profile in the direction substantially perpendicular to the extension direction of the rift basin, and then identifies the thrust fault on the seismic profile.

[0038] The substantially perpendicular includes an angle of 80-100 degrees, preferably 85-95 degrees, with the extension direction of the rift basin. When selecting the seismic profile, the seismic profile can be set as a plurality of parallel seismic profiles, and the interval between the seismic profiles is set as the line spacing or an integer multiple of the line spacing. Through this interval selection mode, on the one hand, the large amount of calculation caused by too dense can be avoided, and on the other hand, the omission can be avoided.

[0039] Specifically, a plurality of features need to be used to determine whether the thrust fault exists and the shape of the thrust fault, for example: the basis for identifying the thrust fault includes the discontinuity point in the seismic reflection axis, the fault wave and the seismic velocity inversion feature. The discontinuity point in the seismic reflection axis generally represents the position of the fault surface, the direction along the discontinuity point can identify the discrete distributed fault wave, according to the two structures, the basic shape of the fault surface can be formed, and finally the velocity spectrum is used to compare the inversion characteristics of the seismic velocity on the upper and lower fault surfaces to determine the thrust fault. Seismic velocity inversion refers to: generally, the seismic velocity increases with the increase of depth, but at the position of the thrust fault, due to the thrust effect, the new stratum is located below the old stratum, so that the seismic velocity at this position forms the condition of decreasing with the increase of depth.

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

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

[0042] Fault rub marks, that is, the relative displacement of the two walls of the fault leaves parallel and uniform rub marks on the fault surface, sometimes forms parallel arranged rub ridges and rub grooves, which can be used to identify the sliding direction between the upper and lower walls.

[0043] Fault slip surface, that is, the relative displacement of the two walls of the fault causes the temperature on the fault surface to rise, so that some iron, manganese, calcium, silicon and other component powders are remelted and deposited on the fault surface to form a smooth film called fault slip surface. The fault slip surface is more likely to appear on the torsional and compressive-torsional fault surface.

[0044] Step, i.e. small step of fault surface formed by relative movement of two plates of fault. Step often extends vertically to the direction of scratch but generally not far. Steps are arranged in parallel to each other. The direction of step cliff indicates the direction of plate movement.

[0045] Fault structure rock, i.e. various structure rocks are often formed in fault zone by faulting. The most common structure rock is fault breccia, in which the size of angular grain is not uniform and there is no directional arrangement. The composition of angular grain is the same as that of two plates of fault.

[0046] Structure lens, i.e. in compressive and compressive-shear fault zone, two groups of conjugate joints are often formed to cut the rock into rhombus blocks, and then slide along the joint surface. The corner part or most of the corner part disappears to form a lens called structure lens. Around the lens, foliation is often formed by sheet minerals.

[0047] After the above morphologies and features are extracted, the thrust fault is identified in multiple different sections by using artificial intelligence recognition or manual recognition.

[0048] In the third step S203, after the thrust fault is identified, a palaeo-buried hill thrust anticline associated with the thrust fault is identified on the upthrown plate of the thrust fault. Specifically, starting from the top of the upthrown plate, the palaeo-buried hill thrust anticline is identified by extending upward until the top surface of the uplift. The palaeo-buried hill can form various structural traps and stratigraphic traps. Due to long-term weathering, erosion and underground water leaching of the palaeo-terrain, the porosity and permeability of the underlying rock, especially the carbonate rock, are greatly increased, and large fractures or solution cavities can be formed.

[0049] In the process of identifying the palaeo-buried hill thrust anticline, the dependence relationship between the palaeo-buried hill thrust anticline and the thrust fault can be identified based on the strike of the thrust fault. When the thrust fault has an associated palaeo-buried hill structure, it has a high probability of forming a palaeo-buried hill thrust anticline oil and gas trap.

[0050] Specifically, the seismic section is selected in the upthrown plate region of the thrust fault, and the initial selected structure is identified by rotating the selected seismic section at a preset angle. Preferably, the preset angle includes any value in the range of 2° to 10°. By using the rotating selection method, the region can be scanned in all azimuths, thereby improving the identification efficiency of the uplift structure.

[0051] When selecting the seismic isochronous slice, the uplift structure is screened based on the range of the uplift structure identified on the seismic section, thereby reducing the amount of calculation data. In the third step, the seismic isochronous slice of the upthrown plate of the thrust fault is selected by continuously selecting the initial selected structure seismic isochronous slice from shallow to deep to identify the palaeo-buried hill thrust anticline structure.

[0052] The basis for identifying the paleo-buried hill thrusting anticline includes: identifying the initial selected structure with uplifted seismic events on the seismic profile; and identifying the initial selected structure as the paleo-buried hill thrusting anticline structure on the seismic isochronous slice, which is ring-shaped and gradually increases with depth.

[0053] After identifying the paleo-buried hill thrusting anticline associated with the thrust fault, the fourth step S204 is entered to determine whether the thrusting paleo-buried hill anticline trap meets the trap conditions: whether there is a reservoir and whether there is a cap rock. The dense cap rock with effective thickness is one of the conditions for the thrusting anticline to have a reservoir, and the cap rock should be a lithology with dense strata, such as mudstone, dense sandstone, dense volcanic rock, rock salt, etc. Specifically, according to the paleo-buried hill lithology data of the drilled well in the adjacent area of the rift basin and the corresponding relationship of the overlying strata of the paleo-buried hill thrusting anticline structure, the thickness, range and lithology of the overlying strata are determined. For example: the lithology of the cap rock of the paleo-buried hill can be determined to be which one of mudstone, dense sandstone, dense volcanic rock, rock salt, etc. according to the stratigraphic age information of the drilled well in the adjacent area and the calibration of the three-dimensional seismic data volume.

[0054] Under the premise that the cap rock is provided above the thrusting anticline structure, it is identified whether there is a high porosity reservoir in the interior of the thrusting anticline structure. Specifically, the porosity and permeability of the upper part of the paleo-buried hill thrusting anticline structure are identified. Specifically, the seismic profile of the paleo-buried hill thrusting anticline structure is intercepted at multiple angles to identify the onlap and erosion; and the porosity and permeability are determined according to the paleo-buried hill lithology data of the drilled well in the adjacent area of the rift basin and the corresponding relationship of the strata of the paleo-buried hill thrusting anticline structure.

[0055] In the present application, the onlap and erosion structure is used to identify the weathering crust, and the porosity and permeability are used to further confirm the existence of the weathering crust reservoir, which can improve the reliability of the identification of the reservoir.

[0056] The identification process can also be realized by the prior art, for example: the seismic information is calibrated according to the logging information, well-to-seismic combination is used to predict the development degree of the pore and fracture reservoir, the weathering crust has the characteristics of low-frequency strong reflection, the inner crack and hole has the characteristics of weak amplitude or chaotic phase and string-shaped reflection, and can be directly identified on the profile. The pore and fracture reservoir is quantitatively described by using the above prediction results, including permeability, porosity, etc. The preferred parameter of the reservoir in the embodiments of the present application is that the porosity is greater than 5% and the permeability is greater than 0.01 md. 2 When the conditions of the reservoir and the cap rock are all met, the effective thrusting paleo-buried hill anticline trap is identified.

[0057] Figure 3 A schematic diagram for identifying the rift basin in the three-dimensional seismic data volume is shown.

[0058] As Figure 3As shown, on the three-dimensional seismic data body, a plurality of seismic profiles are taken along the main line and the connecting line direction; the strike and the extension direction of the rift basin are determined on the seismic profile. For example, on the three-dimensional seismic data body 310, the main line direction is the X axis direction, and the seismic profile 302 is taken, and the connecting line direction is the Y direction, and the seismic profile 301 is taken.

[0059] When the identification is performed from a single profile, there is often an identification ambiguity due to the angle limitation. In the embodiment of the present application, by identifying on two mutually perpendicular profiles respectively, the accuracy can be improved, and the strike and the extension direction can be accurately presented.

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

[0061] On the profile, the fault wave 41, the break point in the seismic reflection axis, and the cross section 43 of the buried hill thrust anticline can be identified, and the range of the thrust fault and the thrust anticline can be determined. According to the information of the adjacent drilled wells, the three-dimensional seismic data body is calibrated, and the lithology and porosity of the cap rock of the buried hill are determined. The adjacent drilled well refers to a test well, and basic formation information including lithology and porosity can be obtained through the test well. The calibration of the three-dimensional seismic data body through the drilling information can be realized by the prior art, and will not be described herein. The formation information of a certain local point is obtained by drilling, and then the three-dimensional seismic data body is calibrated by using the formation horizon data, so that the porosity inside the buried hill thrust anticline in the three-dimensional seismic data body is measured, and the buried hill thrust anticline is screened according to the size of the porosity.

[0062] In the present application, by selecting the seismic profile in the direction substantially perpendicular to the extension direction of the rift basin, the success rate of identifying the concealed thrust fault in the buried hill can be improved.

[0063] In the present application, the method of combining the seismic profile and the seismic isochronous slice is adopted to identify the thrust anticline structure on the upthrown wall of the thrust fault, and the identification accuracy of the buried hill thrust anticline is improved.

[0064] In the present application, by setting specific reservoir conditions and cap rock conditions to screen the anticline structure, the obtained buried hill thrust anticline trap of the rift basin has good effectiveness, and the success rate of exploration can be improved.

[0065] While several embodiments of the application have been shown and described herein, it will be obvious to those skilled in the art that many changes, modifications, and substitutions can be made to the embodiments without departing from the spirit and scope of the application. It is to be understood that various alternatives to the embodiments of the application described herein can be employed in practicing the application. It is intended that the following claims define the scope of the application and that methods equivalent to those shown and described herein can be utilized without departing from the spirit and scope of the application.

Claims

1. A method for identifying ancient buried hill thrust anticline traps in rift basins, characterized in that, include: The first step is to acquire a 3D seismic data volume of the rift basin containing stratigraphic horizon data. The second step is to select seismic profiles in a direction that is basically perpendicular to the extension direction of the rift basin to identify reverse faults. The third step is to select the seismic profile and seismic isochronous slice of the uplifted block of the thrust fault to identify the ancient buried hill thrust anticline structure. The fourth step is to determine whether the ancient buried hill thrust anticline structure simultaneously develops a weathering crust reservoir and an overlying layer. If so, it is identified as an effective ancient buried hill thrust anticline trap in a rift basin. Among them, weathering crust reservoirs are identified by the following characteristics: the top surface of the ancient buried hill thrust anticline structure exhibits uplift and erosion, and the upper part of the ancient buried hill thrust anticline structure has a porosity > 5% and a permeability > 0.01 md. 2 , The overlying layer is identified by the following characteristics: it covers at least an ancient buried hill anticline structure, has a thickness of >20m, and its lithology is mudstone, salt rock, or gypsum rock.

2. The identification method according to claim 1, characterized in that, In the second step, the criteria for identifying reverse faults include: the interruption point of the seismic reflection axis, the tectonic wave, and the seismic velocity reversal characteristics.

3. The identification method according to claim 1, characterized in that, The basic verticality includes an angle of 80-100 degrees with the extension direction of the rift basin.

4. The identification method according to claim 3, characterized in that, In the second step, the seismic profiles are multiple 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 preliminary structures on the seismic profile where the seismic phase axis is raised; A preliminary structure that is ring-shaped and gradually increases in size with depth was identified on seismic isochronous slices as a paleoburied hill thrust anticline structure.

6. The identification method according to claim 5, characterized in that, In the third step, the seismic profile of the uplifted block of the thrust fault is selected in the following manner: Select the seismic profile by rotating it at a preset angle to identify the initial 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 uplifted disk of the thrust fault are selected in the following manner: The paleoburied hill thrust anticline structure was identified by continuously selecting isochronous slices of the initial structural earthquake from shallow to deep.

9. The identification method according to claim 1, characterized in that, In the fourth step, the development of weathering crust reservoirs is determined by the following methods: Seismic profiles of the ancient buried hill thrust anticline structure were taken from multiple angles to identify overshoot and erosion. Based on the lithological data of the ancient buried hills drilled in the adjacent areas of the rift basin and the stratigraphic relationship of the ancient buried hills thrust anticline structure, the porosity and permeability were determined.

10. The identification method according to claim 1, characterized in that, In the fourth step, the development of the overlying lamina is determined by the following method: Based on the lithological data of ancient buried hills from drilling in adjacent areas within the rift basin and their correspondence with the overlying strata of the ancient buried hill thrust anticline structure, the thickness, extent, and lithology of the overlying strata are determined.

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