Methods, systems, media, and equipment for paleogeomorphological restoration in mixed sedimentary settings

Abstract

The present invention discloses a method, system, medium, and equipment for restoring paleo-geomorphology in a mixed sedimentary setting, relating to the technical field of paleo-geomorphology restoration. The method comprises: determining a carbonate rock depositional system; based on the carbonate rock depositional system, determining the range of the clastic rock and carbonate rock depositional systems; separately restoring paleo-geomorphology within the ranges of the clastic rock and carbonate rock depositional systems; obtaining water depth data for the connecting boundary of the carbonate and clastic rocks, and fitting two water depth surfaces for the ranges of the clastic rock and carbonate rock depositional systems, respectively, based on the water depth data; and splicing the two water depth surfaces at the same depth using an isobath to obtain paleo-geomorphology within the carbonate and clastic rock depositional setting. The present invention achieves paleo-geomorphology restoration in a mixed clastic rock and carbonate rock depositional setting.

Description

Technical Field

[0001] The present invention relates to the technical field of paleo-geomorphology restoration, and in particular to a paleo-geomorphology restoration method, system, medium and equipment under a mixed sedimentary background. Background Art

[0002] Paleogeomorphology not only controls the deposition of lacustrine clastic rocks within oil and gas basins but also plays a crucial role in the development and distribution of carbonate rocks, determining, to a certain extent, the distribution of high-quality reservoirs and oil deposits. The restoration and detailed study of pre-depositional paleogeomorphology are of great guiding significance for oil and gas exploration. Currently, there are relatively mature paleogeomorphology restoration techniques, including residual thickness methods, impression methods, backstripping and filling methods, sedimentology methods, sequence stratigraphy methods, and geophysics methods.

[0003] The residual thickness method is to obtain the residual thickness of the intermediate stratum after a series of geological activities such as erosion by subtracting the lower stratum from the upper stratum. The residual thickness obtained ignores the effects of erosion and is therefore generally only used to reflect the stratum trend and cannot accurately reflect the paleogeology. The impression method focuses on the selection of the overlying datum of the target stratum. Although it takes into account the structural characteristics of the stratum before deposition, it does not consider the influence of compaction, which ultimately leads to excessive errors. The sedimentology method restores paleogeology by integrating the structural characteristics of the target stratum before deposition, stratum erosion, paleogeological maps, stratigraphic isopach maps, sandstone isopach maps, and lithofacies paleogeography. Various data such as maps make up for each other's shortcomings, but it is difficult to achieve the purpose of accurate restoration when the tectonic activity is strong. It is also a semi-quantitative method for restoring paleogeology. The classical sequence stratigraphic method for restoring paleogeology takes into account the influence of later structures, but the base level is not suitable for selection, and it lacks the influence of compaction and erosion in the burial process of strata. It cannot be quantitative and the accuracy cannot meet expectations. Although the restoration of paleogeology based on geochemical calculations can restore paleowater depth through drilling paleontology, it has requirements on the number of drilling wells and the workload is huge, making it difficult to achieve accurate restoration of paleowater depth and paleogeology in the entire area.

[0004] The above-mentioned paleogeomorphological restoration methods are generally only used to study relatively simple sedimentary environments, such as relatively simple lake-phase clastic rock sedimentary environments, but they are slightly insufficient when faced with complex environments such as certain lake basins where clastic rocks and carbonate rocks are mixed. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that the existing paleo-geomorphology restoration methods generally only study a single sedimentary environment, and to propose a paleo-geomorphology restoration method in a mixed sedimentary background, comprising the following steps:

[0006] S1. Determine the carbonate sedimentary system;

[0007] S2. Based on the carbonate rock depositional system, determine the scope of the clastic rock and carbonate rock depositional system;

[0008] S3. Restore the paleo-geomorphology of the clastic rock and carbonate rock sedimentary systems separately;

[0009] S4. Obtaining the water depth data of the connection boundary between carbonate rock and clastic rock, and fitting two water depth surfaces of the clastic rock and carbonate rock sedimentary system ranges respectively according to the water depth data;

[0010] S5. The same depth of the two bathymetric surfaces is spliced ​​together through the isobath to obtain the paleo-geomorphology under the sedimentary background of carbonate rocks and clastic rocks.

[0011] Furthermore, the sedimentary characteristics of the carbonate sedimentary system are bioherms.

[0012] Furthermore, S2 is specifically:

[0013] Make residual thickness maps of the upper and lower structural surfaces of the target layer to be restored. The distribution with the smallest residual thickness delineates the scope of the carbonate rock deposition system, and the remaining part is the scope of the clastic rock deposition system.

[0014] Furthermore, paleogeomorphological restoration of the clastic sedimentary system includes:

[0015] The paleo-geomorphic trend was restored using the residual thickness method within the clastic rock depositional system, and a paleo-geomorphic trend map was compiled using drilling data and paleo-water depth correction.

[0016] The depth of decompacted rock layers was restored within the scope of the clastic rock depositional system, and the paleo-geomorphological trend map was adjusted.

[0017] Furthermore, the paleo-geomorphology of the carbonate sedimentary system was restored through seismic phase characteristics.

[0018] Furthermore, S4 is specifically:

[0019] S41. Query characteristic organisms representing water depth according to the geological age of the stratum to be restored and formulate a water depth table of characteristic organisms;

[0020] S42. Collect core and cutting samples at the junction of carbonate rock and clastic rock;

[0021] S43, extracting water depth data of characteristic organisms of the sample based on the water depth table of characteristic organisms;

[0022] S44. Fit the water depth surfaces for the clastic rock and carbonate rock sedimentary systems respectively based on the obtained water depth data and sample locations.

[0023] Furthermore, S44 is specifically:

[0024] S441. Establish a three-dimensional coordinate system at the connecting boundary of the carbonate rock and the clastic rock to obtain the X and Y coordinates of the characteristic organisms of the sample information;

[0025] S442, taking the average water depth of the water depth data of the characteristic organisms of the sample information as the Z coordinate;

[0026] S443. Create an Excel table with the above X, Y, and Z coordinates, import the Excel table into Arcgis for interpolation processing, and obtain two water depth surfaces within the clastic rock and carbonate rock sedimentary system ranges.

[0027] The present invention also proposes a paleo-geomorphology restoration system under mixed sedimentary background, comprising:

[0028] Sedimentary system determination unit, used to determine the carbonate rock sedimentary system;

[0029] Sedimentary system range determination unit, used to determine the range of clastic rock and carbonate rock sedimentary systems based on the carbonate rock sedimentary system;

[0030] Paleomorphological restoration units are used to restore the paleomorphology of clastic rock and carbonate rock sedimentary systems respectively;

[0031] The water depth surface fitting unit is used to obtain the water depth data of the connection boundary between carbonate rock and clastic rock, and to fit two water depth surfaces of the clastic rock and carbonate rock sedimentary system ranges respectively according to the water depth data;

[0032] The water depth surface splicing unit is used to splice the same depth of two water depth surfaces through the equal water depth surface to obtain the paleo-geomorphology under the sedimentary background of carbonate rock and clastic rock.

[0033] The present invention also proposes a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the above-mentioned paleo-geomorphology restoration method under a mixed sedimentary background.

[0034] The present invention also proposes an electronic device, comprising a processor and a memory, wherein the processor and the memory are interconnected, wherein the memory is used to store a computer program, the computer program includes computer-readable instructions, and the processor is configured to call the computer-readable instructions to execute the above-mentioned paleo-geomorphology restoration method under a mixed sedimentary background.

[0035] The beneficial effects brought about by the technical solution provided by the present invention are:

[0036] The present invention first determined the extent of the clastic and carbonate sedimentary systems within a complex sedimentary setting, then restored paleogeomorphology for each based on its own characteristics. Finally, the two regions were rationally fitted and spliced ​​using bathymetric data from characteristic organisms. This method achieves paleogeomorphological restoration within a mixed clastic and carbonate sedimentary setting. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a flow chart of a paleo-geomorphology restoration method under a mixed sedimentary background according to an embodiment of the present invention;

[0038] Figure 2 It is a block diagram of an electronic device in an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0040] Example 1: The flowchart of the paleo-geomorphology restoration method under mixed sedimentary background of the embodiment of the present invention is as follows: Figure 1 , specifically including the following steps:

[0041] S1. Determine the carbonate sedimentary system.

[0042] In a preferred embodiment, the sedimentary characteristics of the carbonate sedimentary system are bioherms.

[0043] As a special type of carbonate rock sedimentary body, bioherms have undergone a long period of diagenesis and sedimentation, resulting in relatively special petrological characteristics, internal structure, basic structure, and landforms. The seismic parameters such as reflection characteristics, continuity, frequency, and amplitude of their seismic profiles are relatively unique compared to the surrounding rocks, and can be accurately identified by their characteristics on the seismic profiles.

[0044] Bioherms are generally developed in warm, shallow, clear and salty shallow-sea atolls. Due to their special lithogenesis, their sedimentation rate is greater than that of the surrounding sediments, so their appearance is generally manifested as hill-like or lens-shaped protrusions; in the process of reef building and the life activities of reef-attached organisms, blocky framework geological bodies with blank, chaotic, discontinuous and no sedimentary forces will gradually form in the bioherms; the lithology of bioherms and overlying layers is often quite different, so the top generally shows the characteristics of double strong phase parallel reflections; the bottom morphology of bioherms is generally convex (the propagation rate of the surrounding rock is less than the reef body rate), flat (the propagation rate is similar) or concave (the propagation rate of the surrounding rock is greater than the reef body rate), and in the case of large bioherms extending out to the sea, obvious progradation will also occur; due to the special mechanical properties of bioherms, there are usually a certain amount of faults or cracks inside them. If they are filled with fluid, chaotic reflection characteristics will appear on the upper part or inside the bioherm.

[0045] Generally speaking, reefs will only show certain seismic reflection characteristics, and the above reflection characteristics may not appear at the same time.

[0046] S2. Based on the carbonate rock depositional system, determine the scope of the clastic rock and carbonate rock depositional system.

[0047] In a preferred embodiment, residual thickness maps are generated in Petrel for the two structural surfaces above and below the target layer of the paleogeomorphology to be restored. The distribution with the smallest residual thickness delineates the carbonate sedimentary system, while the remaining distribution delineates the clastic sedimentary system. The target layer refers to a stratum or sedimentary surface at a specific time in geological history that records the geographic environment and structural characteristics of the time. In this context, it refers to the stratum above the pre-depositional paleogeomorphology to be restored.

[0048] The clastic rocks in the lake basin during the depression period are undercompensated deposits, that is, the accommodation space can completely accommodate the deposited clastic rocks. Clastic rocks are generally deposited first in accessible low-lying areas due to gravity and other effects, while bioherm carbonate rocks are generally deposited in high-lying areas near the horizontal plane due to special biolithogenesis. Therefore, in the residual thickness map, the area with the minimum residual thickness near the identified carbonate bioherms is the least affected by the sedimentation of the two. The range of the carbonate sedimentary system is delineated according to the distribution of this minimum thickness.

[0049] S3. Restore the paleo-geomorphology of the clastic rock and carbonate rock sedimentary systems separately.

[0050] In a preferred embodiment, based on the residual thickness map, a map boundary is set in Petrel to divide the sedimentary system range of clastic rocks and bioherm carbonate rocks. According to the boundary, the entire block paleo-geomorphology is divided into clastic rocks and bioherm carbonate rocks for separate restoration.

[0051] (1) Paleogeomorphological restoration within the clastic rock depositional system

[0052] ①Recovering paleo-geomorphological trends using the residual thickness method

[0053] The paleo-geomorphological trend was restored using the residual thickness method within the clastic rock depositional system, and a paleo-geomorphological trend map was compiled using drilling data and paleo-water depth correction.

[0054] Specifically, based on the correlation between stratigraphic sediment thickness and original paleogeomorphology, paleogeomorphology can be reconstructed using stratigraphic layering interpretation of seismic data. This approach involves identifying an isochronous interface below the erosion surface, characterized by stable sedimentation and good continuity, that can be tracked and compared over a large area, as a datum. This interface is then flattened, and areas with large stratigraphic thickness differences between it and the upper interface represent relatively low-lying landforms, and vice versa. Sedimentary strata subjected to diverse and subsequent geological activity often produce residual thicknesses that are less objective. Paleogeomorphological trend maps are compiled by integrating this residual thickness with drilling data and paleowater depth corrections.

[0055] ② Decompaction depth recovery

[0056] The depth of decompacted rock layers was restored within the scope of the clastic rock depositional system, and the paleo-geomorphological trend map was adjusted.

[0057] During the rifting phase, lake basins were almost entirely underwater, making them less likely to be exposed and eroded by uplift. The amount of underwater erosion was negligible, so exposure and erosion in the clastic paleogeomorphic restoration were corrected only in the non-sinking areas. However, due to the significant influence of gravitational compaction of the overlying strata in later periods, paleogeomorphic restoration in clastic rock blocks focused on restoring this compaction.

[0058] According to previous research results, the relationship between porosity and depth is as follows:

[0059]

[0060] in is the porosity function; is the surface porosity, %; e is the base of the natural logarithm; c is the compaction factor, reflecting the slope of the compaction trend, and z is the burial depth, m. The formula shows that porosity decreases with increasing depth.

[0061] Based on the concept of porosity and the principle that the stratum framework remains unchanged, the following formula is obtained:

[0062]

[0063] in, is the depth of the bottom interface of the rock layer to be decompacted; is the depth of the top interface of the rock layer to be decompacted; is the porosity-depth function of the rock formation; a is the height of the top interface of the rock formation to be decompacted; b is the height of the bottom interface of the rock formation to be decompacted; the right side of the equation is the rock formation skeleton when the formation is restored to the surface, and the obtained x is the depth when the formation is restored to the surface.

[0064] And correct the depth of the compacted rock layer, the steps are as follows:

[0065] ①Build a rock framework for the strata to be restored in the area based on drilling;

[0066] ② Read the depth of each rock layer to be compacted based on the seismic profile;

[0067] ③ Collect porosity data from wells in the area to be restored and determine the constant coefficient of the porosity and depth function of the sandstone and mudstone layers in each well;

[0068] ④ Using the principle of unchanged stratum skeleton, restore and compact each rock layer of the stratum to be restored from top to bottom, that is, calculate the depth of each rock layer when it is restored to the surface;

[0069] If the data is insufficient, the average porosity-depth function (average porosity of a certain rock type in a certain area, depth interval) is used for calculation.

[0070] After obtaining the correction value, the paleogeomorphological trend map is adjusted.

[0071] (1) Paleogeomorphological restoration within the carbonate sedimentary system

[0072] The paleo-geomorphology of the carbonate sedimentary system was restored through seismic phase characteristics.

[0073] Specifically, after carbonate platform deposition, a distinct grain framework is easily formed under the influence of compaction, and the compaction rate of the beach body will also be lower than that of fine-grained sediments. Therefore, the landform restoration during the reef deposition period can almost ignore compaction correction.

[0074] Within the identified bioherm area, grainstone and algal limestone deposited in shallow-water uplift areas on the bioherm platform were generally deposited through lateral and vertical accretion, resulting in generally thicker layers. Landward, due to shallower water bodies and frequent surface exposure, the limestone strata are relatively thin. Basinward, due to weaker hydrodynamic conditions, fine-grained limestone components are deposited, resulting in a relatively low overall thickness. Landward refers to the direction away from the depocenter, with decreasing sedimentary space and gradually higher terrain. Basinward: In geology, a basin is a relatively low-lying area on the Earth's surface, typically formed by crustal movement or erosion. Sediments (such as mud, gravel, etc.) within a basin tend to settle toward the center or lower-lying areas of the basin. Therefore, "basinward" can be understood as the direction in which sediments are deposited within the basin, i.e., toward the center or lower-lying areas of the basin.

[0075] The platform reef-shoal facies often appears as a hillock or lens-shaped appearance on the seismic profile, with double strong phase parallel reflections on the top; the thickness of the inter-reef facies deposits around the platform is relatively thin, with relatively weak reflections and weak continuity at the bottom; the seismic reflection frequency is relatively high and the amplitude is relatively strong towards the basin to the deep water area.

[0076] The above sedimentary microfacies characteristics indicate that seismic facies characteristics can not only divide the scope of bioherms, but also make a detailed description of the paleogeomorphology of bioherm carbonate rocks through the constraints of structure and sedimentary background, supplemented by stratigraphic thickness. The structure is a specific structure of some bioherms, including: reef core (the reef core is the main part of the bioherm, composed of in situ accumulated bioliths or cement rocks, which have a high biological content, mainly reef-building organisms, such as corals, stromatoporoids, bryozoans, etc., and some reef-attached organisms. These organisms form the skeleton of the reef body through in situ group growth, making the reef body strong and wave-resistant.), reef wing (reef wing usually refers to the part of the reef body where the reef phase and the non-reef phase are interlaced in a finger-like manner. On the windward side of the reef body (in front of the reef), due to the impact of wind and waves, the reef is broken. Debris accumulates along the steep slope of the reef front to form fore-reef colluvial rocks or fore-reef breccias; on the leeward side - the back of the reef, it contains more mud matrix, and the debris material is mainly biological debris from the reef core), between reefs (in some reef complexes, the sediments and biological composition between reefs are closely related to the development of the reefs. During marine transgression, the reefs develop, and the reefs are normal marine deposits; during marine regression, the development of the reefs is restricted, and some lagoon-facies deposits may appear between the reefs), for example, the shape, the sedimentary asymmetry on both sides caused by wind direction, etc.

[0077] For example, the seismic phase characteristics of shallow lake algal mounds, pellet beaches or shell beaches in the high part of the structure are weak amplitude, hillock / low-frequency reflection; the seismic phase characteristics of the mudstone in the inter-shoal depression in the low part of the structure are low frequency, continuous and strong reflection; the seismic phase characteristics of the semi-deep lake to deep lake mud at the lower point are low frequency, continuous and medium to weak amplitude reflection.

[0078] The seismic characteristics of sedimentary subfacies in different regions may be slightly different due to the unique geological background. In this step, it is necessary to make corresponding seismic phase characterization templates based on the geological background to analyze the problem.

[0079] S4. Obtain the water depth data of the connection boundary between carbonate rock and clastic rock, and fit two water depth surfaces of the clastic rock and carbonate rock sedimentary system ranges respectively according to the water depth data.

[0080] In a preferred embodiment, S4 is specifically:

[0081] S41. Query characteristic organisms representing water depth according to the geological age of the stratum to be restored and formulate a water depth table of characteristic organisms;

[0082] S42. Collect core and cutting samples at the junction of carbonate rock and clastic rock;

[0083] S43, extracting water depth data of characteristic organisms of the sample based on the water depth table of characteristic organisms;

[0084] S44. Fit the water depth surfaces for the clastic rock and carbonate rock sedimentary systems respectively based on the obtained water depth data and sample locations.

[0085] S5. Using isobaths, we splice two bathymetric surfaces at the same depth to obtain paleo-geomorphology within the context of carbonate and clastic rock deposition. Certain characteristic organisms can accurately determine the paleo-water depth of a lake basin. The relative heights of clastic and carbonate landforms can be determined by the burial depths of these organisms, thereby achieving the desired paleo-geomorphology fitting and splicing effect.

[0086] The above fitting and splicing focuses on the relative height relationship of the two boundaries. However, since the block to be restored has become a paleo-geomorphological trend map, the water depth sample is difficult to define and there may be erosion. Therefore, it is not ideal to use the target layer to splice the paleo-water depth data. The overlying small layer of the target layer to be restored should be used for this work, and finally the relative height relationship between the two can be obtained.

[0087] Example 2: The present invention also proposes a paleo-geomorphology restoration system under mixed sedimentary background, comprising:

[0088] Sedimentary system determination unit, used to determine the carbonate rock sedimentary system;

[0089] Sedimentary system range determination unit, used to determine the range of clastic rock and carbonate rock sedimentary systems based on the carbonate rock sedimentary system;

[0090] Paleomorphological restoration units are used to restore the paleomorphology of clastic rock and carbonate rock sedimentary systems respectively;

[0091] The water depth surface fitting unit is used to obtain the water depth data of the connection boundary between carbonate rock and clastic rock, and to fit two water depth surfaces of the clastic rock and carbonate rock sedimentary system ranges respectively according to the water depth data;

[0092] The water depth surface splicing unit is used to splice the same depth of two water depth surfaces through the equal water depth surface to obtain the paleo-geomorphology under the sedimentary background of carbonate rock and clastic rock.

[0093] Embodiment 3: In an exemplary embodiment, a computer-readable storage medium is included, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the above-mentioned paleo-geomorphology restoration method under a mixed sedimentary background is implemented.

[0094] Example 4: Please refer to Figure 2 In an exemplary embodiment, an electronic device is also included, including at least one processor, at least one memory, and at least one communication bus.

[0095] Wherein, a computer program is stored in the memory, and the computer program includes computer-readable instructions. The processor calls the computer-readable instructions stored in the memory through the communication bus to execute the above-mentioned paleo-geomorphology restoration method under the mixed sedimentary background.

[0096] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for restoring paleo-geomorphology under mixed sedimentary background, characterized in that: The following steps are involved: S1. Determine the carbonate sedimentary system; S2. Based on the carbonate rock depositional system, determine the scope of the clastic rock and carbonate rock depositional system; S3. Restore the paleo-geomorphology of the clastic rock and carbonate rock sedimentary systems separately; S4. Obtaining the water depth data of the connection boundary between carbonate rock and clastic rock, and fitting two water depth surfaces of the clastic rock and carbonate rock sedimentary system ranges respectively according to the water depth data; S5. The same depth of the two bathymetric surfaces is spliced ​​together through the isobath to obtain the paleo-geomorphology under the sedimentary background of carbonate rocks and clastic rocks.

2. The method for restoring paleo-geomorphology under mixed sedimentary background according to claim 1, characterized in that: The sedimentary characteristics of the carbonate sedimentary system are bioherms.

3. The method for restoring paleo-geomorphology under mixed sedimentary background according to claim 1, characterized in that: S2 is specifically: Make residual thickness maps of the upper and lower structural surfaces of the target layer to be restored. The distribution with the smallest residual thickness delineates the scope of the carbonate rock deposition system, and the remaining part is the scope of the clastic rock deposition system.

4. The method for restoring paleo-geomorphology under mixed sedimentary background according to claim 1, characterized in that: The paleo-geomorphological restoration of the clastic rock depositional system includes: The paleo-geomorphic trend was restored using the residual thickness method within the clastic rock depositional system, and a paleo-geomorphic trend map was compiled using drilling data and paleo-water depth correction. The depth of decompacted rock layers was restored within the scope of the clastic rock depositional system, and the paleo-geomorphological trend map was adjusted.

5. The method for restoring paleo-geomorphology under mixed sedimentary background according to claim 1, characterized in that: The paleo-geomorphology of the carbonate sedimentary system was restored through seismic phase characteristics.

6. The method for restoring paleo-geomorphology under mixed sedimentary background according to claim 1, characterized in that: S4 is specifically: S41. Query characteristic organisms representing water depth according to the geological age of the stratum to be restored and formulate a water depth table of characteristic organisms; S42. Collect samples at the junction of carbonate and clastic rocks; S43, extracting water depth data of characteristic organisms of the sample based on the water depth table of characteristic organisms; S44. Fit the water depth surfaces for the clastic rock and carbonate rock sedimentary systems respectively based on the obtained water depth data and sample locations.

7. The method for restoring paleo-geomorphology under mixed sedimentary background according to claim 6, characterized in that: S44 is specifically: S441. Establish a three-dimensional coordinate system at the connecting boundary of the carbonate rock and the clastic rock to obtain the X and Y coordinates of the characteristic organisms of the sample information; S442, taking the average water depth of the water depth data of the characteristic organisms of the sample information as the Z coordinate; S443. Create an Excel table with the above X, Y, and Z coordinates, import the Excel table into Arcgis for interpolation processing, and obtain two water depth surfaces within the clastic rock and carbonate rock sedimentary system ranges.

8. A paleo-geomorphology restoration system under mixed sedimentary background, characterized in that: include: Sedimentary system determination unit, used to determine the carbonate rock sedimentary system; Sedimentary system range determination unit, used to determine the range of clastic rock and carbonate rock sedimentary systems based on the carbonate rock sedimentary system; Paleomorphological restoration units are used to restore the paleomorphology of clastic rock and carbonate rock sedimentary systems respectively; The water depth surface fitting unit is used to obtain the water depth data of the connection boundary between carbonate rock and clastic rock, and to fit two water depth surfaces of the clastic rock and carbonate rock sedimentary system ranges respectively according to the water depth data; The water depth surface splicing unit is used to splice the same depth of two water depth surfaces through the equal water depth surface to obtain the paleo-geomorphology under the sedimentary background of carbonate rock and clastic rock.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

10. An electronic device, characterized in that: The method comprises a processor and a memory, wherein the processor and the memory are interconnected, wherein the memory is used to store a computer program, the computer program includes computer-readable instructions, and the processor is configured to call the computer-readable instructions to execute the method according to any one of claims 1 to 7.

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