Paleomorphological restoration method and device

Abstract

The present invention provides a paleogeomorphic restoration method and apparatus, comprising: performing a sedimentary background analysis on a target layer to determine the maximum flooding surface and the isochronous reflection surface at the top of the target layer in the fourth-order cyclic sequence in which the target layer is located; determining the trend anomaly thickness based on the maximum flooding surface and the isochronous reflection surface at the top of the target layer; determining the actual stratum thickness based on the trend anomaly thickness and interlayer velocity to obtain preliminary paleogeomorphic restoration results; utilizing drilling data to compile statistical data on the stratification between the maximum flooding surface and the target layer, and determining a corrected thickness trend surface based on the stratification data; and correcting the preliminary paleogeomorphic restoration results using the corrected thickness trend surface to obtain paleogeomorphic data for the target layer. By using the trend anomaly thickness to determine the actual stratum thickness and perform paleogeomorphic restoration, the accuracy of depicting paleogeomorphic details can be improved. Combining thickness correction with actual drilling data can reduce errors caused by erosion of the top surface of the target layer.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas exploration, and in particular to a paleo-landform restoration method and device. Background Art

[0002] Paleogeomorphology controls the planar distribution of sedimentary facies, thereby governing the development conditions and superposition relationships of reservoirs, caprocks, and source rocks. This principle is universal in both clastic and carbonate reservoirs. Therefore, in oil and gas exploration, paleogeomorphology is often used to predict the development zones of reservoirs, caprocks, and source rocks. Accurate reconstruction of paleogeomorphology is crucial for oil and gas exploration. Numerous paleogeomorphology reconstruction methods are currently used for sedimentary environment analysis and reservoir prediction, including residual thickness methods, impression methods, sedimentology methods, high-resolution sequence stratigraphy, geophysical methods, dual-interface methods, structural and sedimentary simulations, and sedimentary micro-amplitude paleogeomorphology inference methods. These methods, many of which are based on seismic data, are widely applicable and operational, and the results can generally reflect the paleogeomorphology of a specific geological period. However, in the actual application process, on the one hand, the paleo-geomorphology at the end of the deposition of the research target layer that geologists are concerned about is mostly unconformity surface, which generally undergoes weathering and erosion. In this case, the paleo-geomorphology restored using seismic data and the residual thickness method will have more or less deviations, and may even lead to understandings that contradict the actual drilling; on the other hand, although the paleo-geomorphology restoration based on the reflection time of seismic data can reflect its overall morphology to a certain extent, it cannot meet the requirements for the depiction of local high-precision micro-geomorphology.

[0003] Therefore, there are two shortcomings in the existing technology of using seismic data to restore paleogeomorphology: (1) errors caused by the amount of erosion are inevitable during the restoration process. (2) Seismic data is based on reflection time, and the description accuracy of the actual stratum thickness is low. Therefore, the restored paleogeomorphology results are generally smooth, which can meet the needs of general sedimentary background analysis, but the effect of depicting paleogeomorphological details is poor. Summary of the Invention

[0004] An embodiment of the present invention provides a paleo-geomorphology restoration method for reducing errors caused by erosion and improving the accuracy of depicting paleo-geomorphology details. The method includes:

[0005] Analyze the sedimentary background of the target layer and determine the maximum flooding surface of the fourth-order cyclic sequence where the target layer is located and the isochronous reflection surface at the top of the target layer;

[0006] Determine the trend anomaly thickness based on the maximum flooding surface of the fourth-order cyclic sequence where the target layer is located and the isochronous reflection surface at the top of the target layer;

[0007] According to the trend anomaly thickness and interlayer velocity, the actual stratum thickness is determined and the preliminary results of paleo-geomorphological restoration are obtained;

[0008] Using drilling data, statistically analyzing layered data between the maximum flooding surface and the target layer, and determining a corrected thickness trend surface based on the layered data;

[0009] The preliminary results of paleo-geomorphology restoration were corrected using the corrected thickness trend surface to obtain the paleo-geomorphology data of the target layer.

[0010] The present invention also provides a paleo-geomorphology restoration device for reducing errors caused by erosion and improving the accuracy of depicting paleo-geomorphology details. The device includes:

[0011] The isochronous interface selection module is used to analyze the sedimentary background of the target layer and determine the maximum flooding surface of the fourth-order cyclic sequence where the target layer is located and the isochronous reflection surface at the top of the target layer;

[0012] The trend anomaly thickness determination module is used to determine the trend anomaly thickness based on the maximum flooding surface of the fourth-order cyclic sequence where the target layer is located and the isochronous reflection surface at the top of the target layer;

[0013] The paleo-geomorphology preliminary restoration module is used to determine the actual stratum thickness based on the trend anomaly thickness and interlayer velocity, and obtain the preliminary results of paleo-geomorphology restoration;

[0014] a drilling correction module, configured to utilize drilling data to collect statistics on layer data between the maximum flooding surface and the target layer, and determine a corrected thickness trend surface based on the layer data;

[0015] The paleo-geomorphology restoration module is used to correct the preliminary results of paleo-geomorphology restoration using the corrected thickness trend surface to obtain the paleo-geomorphology data of the target layer.

[0016] An embodiment of the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned paleo-geomorphology restoration method when executing the computer program.

[0017] An embodiment of the present invention also provides a computer-readable storage medium, which stores a computer program for executing the above-mentioned paleo-geomorphology restoration method.

[0018] In an embodiment of the present invention, a sedimentary background analysis is performed on the target layer to determine the maximum flooding surface and the isochronous reflection surface at the top of the fourth-order cyclic sequence in which the target layer is located. Based on the maximum flooding surface and the isochronous reflection surface at the top of the fourth-order cyclic sequence in which the target layer is located, the trend anomaly thickness is determined. Based on the trend anomaly thickness and interlayer velocity, the actual stratum thickness is determined to obtain preliminary results of paleogeomorphic restoration. Using drilling data, layered data from the maximum flooding surface to the target layer is statistically analyzed, and a corrected thickness trend surface is determined based on the layered data. The preliminary results of paleogeomorphic restoration are corrected using the corrected thickness trend surface to obtain paleogeomorphic data for the target layer. By using the trend anomaly thickness to determine the actual stratum thickness and perform paleogeomorphic restoration, the accuracy of micro-relief depiction can be improved, thereby improving the accuracy of paleogeomorphic details. Combining thickness correction with actual drilling data can reduce errors caused by erosion of the top surface of the target layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 Schematic diagram of the paleo-geomorphology restoration method according to an embodiment of the present invention.

[0021] Figure 2 Schematic diagram of a specific implementation method of step 102 in a specific embodiment of the present invention.

[0022] Figure 3 Schematic diagram of a specific implementation method of step 104 in a specific embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of the technical implementation steps for a specific application of the present invention.

[0024] Figure 5 This is the intention of paleo-geomorphological restoration ideas implemented in a specific application of the present invention.

[0025] Figure 6 This is a schematic diagram of ancient landforms restored using the traditional residual thickness method in a specific application of the present invention.

[0026] Figure 7 This is a schematic diagram of a paleo-geomorphology restored by using the paleo-geomorphology restoration method provided by an embodiment of the present invention in a specific application implementation of the present invention.

[0027] Figure 8 Schematic diagram of a paleo-landform restoration device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] The present invention provides a method for restoring ancient landforms, which is used to reduce the error caused by the amount of erosion and improve the accuracy of depicting ancient landform details. Figure 1 As shown, the method includes:

[0030] Step 101: Perform sedimentary background analysis on the target layer to determine the maximum flooding surface of the fourth-order cyclic sequence where the target layer is located and the isochronous reflection surface at the top of the target layer;

[0031] Step 102: Determine the trend anomaly thickness based on the maximum flooding surface of the fourth-order cyclic sequence where the target layer is located and the isochronous reflection surface at the top of the target layer;

[0032] Step 103: Determine the actual stratum thickness based on the trend anomaly thickness and interlayer velocity, and obtain preliminary results of paleo-geomorphological restoration;

[0033] Step 104: Using the drilling data, statistically analyze the layered data between the maximum flooding surface and the target layer, and determine the corrected thickness trend surface based on the layered data;

[0034] Step 105: Use the corrected thickness trend surface to correct the preliminary results of paleo-geomorphology restoration to obtain paleo-geomorphology data of the target layer.

[0035] Depend on Figure 1 As can be seen from the process shown, in an embodiment of the present invention, by performing a sedimentary background analysis on the target layer, the maximum flooding surface of the fourth-order cyclic sequence where the target layer is located and the isochronous reflection surface at the top of the target layer are determined; based on the maximum flooding surface of the fourth-order cyclic sequence where the target layer is located and the isochronous reflection surface at the top of the target layer, the trend anomaly thickness is determined; based on the trend anomaly thickness and interlayer velocity, the actual stratum thickness is determined to obtain preliminary results of paleogeomorphic restoration; using drilling data, the layered data between the maximum flooding surface and the target layer are statistically analyzed, and based on the layered data, a corrected thickness trend surface is determined; and the preliminary results of paleogeomorphic restoration are corrected using the corrected thickness trend surface to obtain paleogeomorphic data of the target layer. By using the trend anomaly thickness to determine the actual stratum thickness and perform paleogeomorphic restoration, the accuracy of micro-relief can be improved, thereby improving the accuracy of paleogeomorphic details. Combining actual drilling data for thickness correction can reduce errors caused by erosion of the top surface of the target layer.

[0036] In specific implementation, first conduct a sedimentary background analysis of the target layer to determine the maximum flooding surface of the fourth-order cyclic sequence where the target layer is located and the isochronous reflection surface at the top of the target layer. In specific implementation, select the isochronous reflection interface closest to the target layer below the target layer to determine it as the aforementioned maximum flooding surface; select the isochronous reflection interface closest to the top of the target layer above the maximum flooding surface to determine it as the isochronous reflection surface at the top of the target layer. The principle to be adhered to when selecting the maximum flooding surface and the isochronous reflection surface at the top of the target layer is to be as close to the target layer as possible and to have relatively obvious dividing marks on the lithology, logging curves and seismic profiles.

[0037] After determining the maximum flooding surface of the fourth-order cyclic sequence where the target layer is located and the isochronous reflection surface at the top of the target layer, the trend anomaly thickness is determined based on the maximum flooding surface of the fourth-order cyclic sequence where the target layer is located and the isochronous reflection surface at the top of the target layer. Figure 2 As shown, including:

[0038] Step 201: calibrate and interpret the maximum flooding surface and the isochronous reflection surface at the top of the target layer using seismic data of the target layer, and obtain the layer data of the isochronous reflection interface at the top and bottom of the target layer;

[0039] Step 202: Calculate the time thickness of the target layer during the deposition period based on the layer data of the top isochronous reflection interface and the layer data of the bottom isochronous reflection interface of the target layer;

[0040] Step 203: Calculate the trend anomaly thickness based on the time thickness of the target layer during the deposition period.

[0041] Based on the trend anomaly thickness and interlayer velocity, the actual stratigraphic thickness was determined, yielding preliminary results for paleogeomorphological reconstruction. Paleogeomorphological reconstruction utilizes a method that converts temporal data (i.e., trend anomaly thickness) into actual thickness, improving the accuracy of micro-geomorphological depictions.

[0042] At the same time, using drilling data, statistics are made on the stratification data between the maximum flooding surface and the target layer, and the corrected thickness trend surface is determined based on the stratification data. Figure 3 As shown, including:

[0043] Step 301: determining a sub-layer closest to the true top surface of the target layer based on the layering data; wherein the sub-layer has not suffered thickness erosion;

[0044] Step 302: Determine the actual drilling thickness between the small layer and the isochronous reflection surface at the top of the target layer, perform interwell interpolation based on the actual drilling thickness, and obtain a corrected thickness trend surface.

[0045] After obtaining the corrected thickness trend surface, the preliminary results of paleo-geomorphological restoration are corrected using the corrected thickness trend surface to obtain paleo-geomorphological data of the target layer. In a specific embodiment, the paleo-geomorphological data of the target layer can also be used to obtain a paleo-geomorphological map of the target layer at the end of its deposition.

[0046] The following is a specific example to illustrate how the present invention restores paleo-geomorphology. This example is applied to the Carboniferous strata in the Halahatang 3D area.

[0047] The key technical approaches employed in this specific example include sedimentary cycle analysis, isochronous interface selection, key interface calibration and interpretation, and the conversion of seismic reflection time to stratigraphic thickness. The fundamental approach is to first convert the residual time thickness derived from existing time-domain seismic data into actual thickness, then use data closest to the actual stratigraphic thickness to restore paleogeomorphology and minimize thickness errors. Furthermore, actual drilling data is combined to correct for the effects of denudation on the top surface of the weathering crust.

[0048] Specific steps are as follows Figure 4 Shown, including:

[0049] (1) Based on the sedimentary background analysis, the maximum flooding surface S1 of the fourth-order cyclic sequence where the target layer is located, the isochronous reflection surface S2 at the top of the target layer and the distribution of the unconformity surface are determined according to drilling, logging, seismic data and sequence stratigraphic analysis, and calibrated on the seismic section. Figure 5 The following figure shows the determined locations of S1 and S2. The principle for selecting S1 and S2 is to be as close to the target layer as possible and to have relatively clear demarcation marks on lithology, well logging curves, and seismic profiles. The bottom surface is the closest isochronous reflection interface below the target layer, namely the maximum flooding surface S1. The top surface is the isochronous reflection interface above the maximum flooding surface and closest to the top of the target layer. S2 may be below or above the actual drilling target layer, with obvious seismic reflection characteristics as the criterion.

[0050] (2) Obtaining basic data for paleogeomorphological restoration:

[0051] ① Obtain seismic reflection data. First, use the seismic reflection data to calibrate and interpret S1 and S2, and obtain the horizon data of the isochronous reflection interface at the top and bottom of the target layer. Based on this, calculate the time thickness of the target layer during its deposition period. On this basis, calculate the trend anomaly thickness. Then, combine the interlayer velocity to convert the trend anomaly thickness (time domain data) into actual layer thickness, and obtain the preliminary result A of paleo-geomorphological restoration;

[0052] ② Obtain drilling data. Obtain as much drilling data as possible in the work area, collect statistics on the layer data between the maximum flooding surface and the target layer, and select the small layer H1 as close to the true top surface of the target layer as possible (see Figure 5), the condition for selecting layer H1 is that it has not suffered thickness erosion. The actual drilling thickness to the isochronous reflector S2 at the top of the target layer is then calculated and interpolated between wells to obtain the corrected thickness trend surface B.

[0053] (3) After obtaining the above basic data, the paleogeomorphological result A is corrected using the corrected thickness trend surface B according to different situations, that is, the corrected paleogeomorphological data are obtained, and the paleogeomorphological map of the target layer at the end of its deposition is obtained using the corrected paleogeomorphological data.

[0054] The Halahatang area is located on the southern slope of the Tabei paleo-uplift in the Tarim Basin. During the Carboniferous deposition period, the paleo-geomorphology was generally high in the north and low in the south, and the provenance came from the northeast. This specific example uses the paleo-geomorphology restoration method provided by the embodiment of the present invention to restore the paleo-geomorphology of the late Carboniferous deposition period, and compares it with the results restored by the residual thickness method in the prior art. The results restored by the method provided by the embodiment of the present invention better explain the paleo-geomorphology of the Carboniferous deposition period. Compared with the paleo-geomorphology results restored by the original seismic data (such as Figure 6 ), and after correction using drilling data (as shown in Figure 7 As shown), we can see the following two significant differences:

[0055] (1) The paleogeomorphology results are more consistent with the actual geological conditions: Drilling in the study area has confirmed that the provenance is NE-SW, while the paleogeomorphology results directly restored using seismic data show that the entire southwest direction is a wide and gentle underwater low rise, and the sand body did not cross the paleohigh and deposit in the south. This is inconsistent with the actual situation revealed by drilling that underwater distributary channels and frontal sand bars are developed in the southwest. Therefore, the paleogeomorphology corrected by drilling data is more accurate and reasonable;

[0056] (2) The paleo-geomorphology is clearer and the layers are distinct. The overall paleo-geomorphology restored using seismic data is relatively smooth, reflecting the overall sedimentary pattern. However, the micro-geomorphology near the well area is not clear enough. This deficiency can be significantly improved after well calibration. First, the development and distribution of underwater distributary channels are more consistent with the actual geological background. In addition, the development of the local karst highland in the southeastern part of the work area is more clearly portrayed.

[0057] The implementation of the above specific application is only an example, and the remaining implementation methods will not be described in detail one by one.

[0058] Based on the same inventive concept, the embodiment of the present invention further provides a paleo-geomorphology restoration device. Since the principle of the paleo-geomorphology restoration device to solve the problem is similar to that of the paleo-geomorphology restoration method, the implementation of the paleo-geomorphology restoration device can refer to the implementation of the paleo-geomorphology restoration method, and the repeated parts will not be repeated. The specific structure is as follows: Figure 8 As shown:

[0059] The isochronous interface selection module 801 is used to perform sedimentary background analysis on the target layer and determine the maximum flooding surface of the fourth-order cyclic sequence where the target layer is located and the isochronous reflection surface at the top of the target layer;

[0060] The trend abnormal thickness determination module 802 is used to determine the trend abnormal thickness based on the maximum flooding surface of the fourth-order cyclic sequence where the target layer is located and the isochronous reflection surface at the top of the target layer;

[0061] The paleo-geomorphology preliminary restoration module 803 is used to determine the actual stratum thickness based on the trend anomaly thickness and interlayer velocity, and obtain the preliminary results of paleo-geomorphology restoration;

[0062] The drilling correction module 804 is used to use the drilling data to collect the layer data between the maximum flooding surface and the target layer, and determine the corrected thickness trend surface based on the layer data;

[0063] The paleo-geomorphology restoration module 805 is used to correct the preliminary results of paleo-geomorphology restoration using the corrected thickness trend plane to obtain paleo-geomorphology data of the target layer.

[0064] In a specific embodiment, the isochronous interface selection module 801 is specifically used to:

[0065] The isochronous reflection interface closest to the target layer below the target layer is selected and determined as the maximum flooding surface;

[0066] The isochronous reflection interface closest to the top of the target layer above the maximum flooding surface is selected and determined as the isochronous reflection surface at the top of the target layer.

[0067] In a specific embodiment, the trend abnormal thickness determination module 802 is specifically used to:

[0068] Using the seismic data of the target layer, the maximum flooding surface and the isochronous reflection surface at the top of the target layer are calibrated and interpreted to obtain the horizon data of the isochronous reflection interface at the top and bottom of the target layer;

[0069] The time thickness of the target layer during its deposition period is calculated based on the horizon data of the isochronous reflection interface at the top and bottom of the target layer.

[0070] According to the time thickness of the target layer during its deposition period, the trend anomaly thickness is calculated.

[0071] In a specific embodiment, the drilling correction module 804 is specifically used to:

[0072] According to the layering data, the sub-layer closest to the true top surface of the target layer is determined; wherein the sub-layer has not suffered thickness erosion;

[0073] The actual drilling thickness between the small layer and the isochronous reflection surface at the top of the target layer is determined, and inter-well interpolation is performed based on the actual drilling thickness to obtain the corrected thickness trend surface.

[0074] An embodiment of the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned paleo-geomorphology restoration method when executing the computer program.

[0075] An embodiment of the present invention further provides a computer-readable storage medium storing a computer program for executing the above-mentioned paleo-geomorphology restoration method.

[0076] In summary, the paleo-geomorphology restoration method and apparatus provided by the embodiments of the present invention have the following advantages:

[0077] By analyzing the sedimentary background of the target layer, the maximum flooding surface and the isochronous reflection surface at the top of the fourth-order cyclic sequence within which the target layer resides are determined. Based on the maximum flooding surface and the isochronous reflection surface at the top of the target layer within the fourth-order cyclic sequence within which the target layer resides, the trend anomaly thickness is determined. Based on the trend anomaly thickness and interlayer velocity, the actual stratigraphic thickness is determined, yielding preliminary paleogeomorphological reconstruction results. Using drilling data, layered data from the maximum flooding surface to the target layer are statistically analyzed, and a corrected thickness trend surface is determined based on the layered data. The corrected thickness trend surface is used to correct the preliminary paleogeomorphological reconstruction results, yielding paleogeomorphological data for the target layer. By using the trend anomaly thickness to determine the actual stratigraphic thickness and perform paleogeomorphological reconstruction, the accuracy of microreliefs and, consequently, details of paleogeomorphology can be improved. Combining thickness correction with actual drilling data can reduce errors caused by erosion of the target layer's top surface.

[0078] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, apparatus, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0079] The present invention is described with reference to flowcharts and / or block diagrams of methods, apparatuses, and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0080] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0081] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0082] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for restoring ancient landforms, characterized in that: include: Analyze the sedimentary background of the target layer and determine the maximum flooding surface of the fourth-order cyclic sequence where the target layer is located and the isochronous reflection surface at the top of the target layer; Determine the trend anomaly thickness based on the maximum flooding surface of the fourth-order cyclic sequence where the target layer is located and the isochronous reflection surface at the top of the target layer. The isochronous reflection surface at the top of the target layer is the isochronous reflection interface closest to the top of the target layer above the maximum flooding surface. Determine whether the isochronous reflection surface at the top of the target layer is below or above the actual drilling target layer based on seismic reflection characteristics. According to the trend anomaly thickness and interlayer velocity, the actual stratum thickness is determined and the preliminary results of paleo-geomorphological restoration are obtained; Using drilling data, statistically analyzing layered data between the maximum flooding surface and the target layer, and determining a corrected thickness trend surface based on the layered data; The preliminary results of paleo-geomorphological restoration were corrected using the corrected thickness trend surface to obtain the paleo-geomorphological data of the target layer. Determining a corrected thickness trend surface based on the layered data includes: Determining, based on the layering data, a sub-layer closest to the true top surface of the target layer; wherein the sub-layer has not suffered thickness erosion; The actual drilling thickness between the small layer and the isochronous reflection surface at the top of the target layer is determined, and inter-well interpolation is performed based on the actual drilling thickness to obtain a corrected thickness trend surface.

2. The method according to claim 1, wherein Determine the maximum flooding surface of the fourth-order cyclic sequence where the target layer is located, including: An isochronous reflection interface below the target layer and closest to the target layer is selected and determined as the maximum flooding surface.

3. The method according to claim 1, wherein According to the maximum flooding surface of the fourth-order cyclic sequence where the target layer is located and the isochronous reflection surface at the top of the target layer, the trend anomaly thickness is determined, including: Using seismic data of the target layer, the maximum flooding surface and the isochronous reflection surface at the top of the target layer are calibrated and interpreted to obtain the horizon data of the isochronous reflection interface at the top of the target layer and the horizon data of the isochronous reflection interface at the bottom of the target layer; The time thickness of the target layer during its deposition period is calculated based on the horizon data of the isochronous reflection interface at the top and bottom of the target layer. According to the time thickness of the target layer during its deposition period, the trend anomaly thickness is calculated.

4. A paleo-geomorphology restoration device, characterized in that: include: The isochronous interface selection module is used to analyze the sedimentary background of the target layer and determine the maximum flooding surface of the fourth-order cyclic sequence where the target layer is located and the isochronous reflection surface at the top of the target layer; The trend anomaly thickness determination module is used to determine the trend anomaly thickness based on the maximum flooding surface of the fourth-order cyclic sequence where the target layer is located and the isochronous reflection surface at the top of the target layer. The isochronous reflection surface at the top of the target layer is selected as the isochronous reflection interface closest to the top of the target layer above the maximum flooding surface. Based on the seismic reflection characteristics, it is determined whether the isochronous reflection surface at the top of the target layer is below or above the actual drilling target layer. The paleo-geomorphology preliminary restoration module is used to determine the actual stratum thickness based on the trend anomaly thickness and interlayer velocity, and obtain the preliminary results of paleo-geomorphology restoration; a drilling correction module, configured to utilize drilling data to collect statistics on layer data between the maximum flooding surface and the target layer, and determine a corrected thickness trend surface based on the layer data; The paleo-geomorphology restoration module is used to correct the preliminary results of paleo-geomorphology restoration using the corrected thickness trend surface to obtain the paleo-geomorphology data of the target layer; The drilling correction module is specifically used for: Determining, based on the layering data, a sub-layer closest to the true top surface of the target layer; wherein the sub-layer has not suffered thickness erosion; The actual drilling thickness between the small layer and the isochronous reflection surface at the top of the target layer is determined, and inter-well interpolation is performed based on the actual drilling thickness to obtain a corrected thickness trend surface.

5. The device according to claim 4, characterized in that The isochronous interface selection module is specifically used for: An isochronous reflection interface below the target layer and closest to the target layer is selected and determined as the maximum flooding surface.

6. The device according to claim 4, characterized in that The trend abnormal thickness determination module is specifically used for: Using seismic data of the target layer, the maximum flooding surface and the isochronous reflection surface at the top of the target layer are calibrated and interpreted to obtain the horizon data of the isochronous reflection interface at the top of the target layer and the horizon data of the isochronous reflection interface at the bottom of the target layer; The time thickness of the target layer during its deposition period is calculated based on the horizon data of the isochronous reflection interface at the top and bottom of the target layer. According to the time thickness of the target layer during its deposition period, the trend anomaly thickness is calculated.

7. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method according to any one of claims 1 to 3 is implemented.

8. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program for executing the method according to any one of claims 1 to 3.

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