Methods, apparatus, equipment, storage media, and computer programs for paleogeographic restoration

Abstract

This disclosure relates to the field of oil and gas exploration technology, and particularly to a method, apparatus, equipment, storage medium, and computer program for restoring paleogeography of carbonate rock sedimentary formations. The method includes: acquiring lithological information of carbonate rock strata, the lithological information including the lithological categories of the carbonate rock strata and the corresponding stratum thicknesses for each lithological category; determining the elevation value of a first geomorphic unit of the carbonate rock strata based on the lithological categories and the corresponding stratum thicknesses; and restoring the paleogeography of the carbonate rock strata based on the elevation value of the first geomorphic unit. Using this method, the paleogeography of carbonate rock strata can be accurately restored.

Description

Technical Field

[0001] This disclosure relates to the field of oil and gas exploration technology, and in particular to a method, apparatus, equipment, storage medium and computer program for restoring paleomorphological features of carbonate rock sedimentary deposits. Background Technology

[0002] Paleogeography is a crucial factor controlling the development and distribution of sedimentary facies, which in turn form the material basis for reservoir and oil reservoir formation. Therefore, paleogeography, to a certain extent, controls the distribution of high-quality reservoirs and oil and gas. The study of paleogeography not only reconstructs the paleogeographic patterns of the Earth's surface during sedimentary periods but also has significant implications for guiding oil and gas exploration. Currently, traditional paleogeographic reconstruction methods can be categorized into residual thickness methods, impression methods, and backstripping methods, among others.

[0003] Because carbonate rocks have a significantly different depositional environment from clastic rocks, and are easily dissolved, eroded, and weathered, it is very limited to reconstruct the paleogeography of the depositional period using data on the thickness and distribution of the overlying strata after carbonate rock deposition. Summary of the Invention

[0004] This disclosure provides a method, apparatus, equipment, storage medium, and computer program for restoring paleogeographic features of carbonate rock sediments, enabling more accurate restoration of paleogeographic features.

[0005] Firstly, this disclosure provides a method for paleogeographic reconstruction, wherein the paleogeographic features include carbonate sedimentary paleogeographic features, comprising:

[0006] Obtain lithological information of carbonate rock formations, wherein the lithological information includes the lithological categories of the carbonate rock formations and the formation thickness corresponding to each lithological category;

[0007] Based on the lithology category and the stratum thickness corresponding to each lithology category, the elevation value of the first geomorphic unit of the carbonate rock strata is determined;

[0008] Based on the elevation value of the first geomorphic unit, the paleogeography of the carbonate rock strata is reconstructed.

[0009] In some embodiments, determining the elevation value of the first geomorphic unit of the carbonate rock strata based on the lithology and the stratigraphic thickness corresponding to each lithology includes:

[0010] Based on the lithology category and the formation thickness corresponding to each lithology category, the thickness ratio parameter is determined;

[0011] The elevation value of the first geomorphic unit is determined based on the thickness ratio parameter.

[0012] In some embodiments, determining the thickness ratio parameter based on the lithology category and the formation thickness corresponding to each lithology category includes:

[0013] One of the lithological categories is designated as the reference lithological category;

[0014] The thickness ratio parameter is determined based on the following formula:

[0015]

[0016] Among them, R i T represents the thickness ratio parameter corresponding to each lithological category other than the reference lithological category. ref T represents the formation thickness corresponding to the reference lithology category. i The stratum thickness is the thickness of each lithology category other than the reference lithology category, where i is an integer and 1≤i≤N-1, and N is the number of lithology categories.

[0017] In some embodiments, determining the elevation value of the first geomorphic unit based on the thickness ratio parameter includes:

[0018] The elevation value of the first geomorphic unit is determined based on the following formula:

[0019]

[0020] Where X1 is the elevation value of the first geomorphic unit, C i λ represents the weight of each lithology category other than the reference lithology category, and λ is the baseline number.

[0021] In some embodiments, the method further includes:

[0022] Obtain the lithofacies information of the carbonate rock strata;

[0023] The process of reconstructing the paleogeography of the carbonate rock strata based on the elevation value of the first geomorphic unit includes:

[0024] Based on the lithofacies information, the elevation value of the first geomorphic unit is adjusted to obtain the elevation value of the second geomorphic unit;

[0025] Based on the elevation value of the second geomorphic unit, the paleogeography of the carbonate rock strata is reconstructed.

[0026] In some embodiments, the lithofacies information includes the lithofacies category of the carbonate rock formation and the formation thickness corresponding to the lithofacies category;

[0027] The step of adjusting the elevation value of the first geomorphic unit based on the lithofacies information to obtain the elevation value of the second geomorphic unit includes:

[0028] Based on the lithofacies information, determine the ratio of the thickness of the strata corresponding to the lithofacies category to the total thickness of the carbonate strata;

[0029] Based on the ratio and the lithofacies category, the elevation adjustment value is determined;

[0030] Based on the elevation adjustment value, the elevation value of the first geomorphic unit is adjusted to obtain the elevation value of the second geomorphic unit.

[0031] Secondly, this disclosure provides a paleogeographic restoration device, wherein the paleogeographic features include carbonate sedimentary paleogeographic features, comprising:

[0032] The acquisition unit is used to acquire lithological information of carbonate rock strata, the lithological information including the lithological categories of the carbonate rock strata and the stratum thickness corresponding to each lithological category;

[0033] A determining unit is used to determine the elevation value of the first geomorphic unit of the carbonate rock strata based on the lithology category and the stratum thickness corresponding to each lithology category;

[0034] The restoration unit is used to restore the paleogeography of the carbonate rock strata based on the elevation value of the first geomorphic unit.

[0035] Thirdly, this disclosure provides a computer device including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method described in the foregoing aspects.

[0036] Fourthly, this disclosure provides a computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the steps of the methods described in the above aspects.

[0037] Fifthly, this disclosure provides a computer program product, including a computer program / instructions that, when executed by a processor, implement the steps of the methods described in the foregoing aspects.

[0038] This disclosure provides a method, apparatus, equipment, storage medium, and computer program for paleogeographic reconstruction of carbonate sedimentary formations. It establishes a method for determining the elevation values ​​of geomorphic units based on lithological categories and their corresponding thicknesses. This method can quantitatively calculate the elevation values ​​of geomorphic units from all individual wells, then project them onto a plane to delineate paleogeographic undulations, thereby obtaining the paleogeographic characteristics of the target strata and providing technical support for oil and gas exploration and development. Furthermore, this method is highly operable, provides intuitive and clear identification, and has high application value. Attached Figure Description

[0039] The present disclosure will be described in more detail below based on embodiments and with reference to the accompanying drawings:

[0040] Figure 1 This is a schematic flowchart illustrating a method for restoring paleogeographic features from carbonate rock sedimentary deposits, as provided in an embodiment of this disclosure.

[0041] Figure 2 A lithology identification map of a well logging operation provided in an embodiment of this disclosure.

[0042] Figure 3 A contour map of the elevation values ​​of geomorphic units without lithofacies correction provided in this embodiment of the disclosure.

[0043] Figure 4 A contour map of the elevation values ​​of geomorphic units after lithofacies correction provided in this embodiment of the disclosure.

[0044] Figure 5 The paleogeographic map is a reconstruction of a geomorphic unit elevation contour map provided in this embodiment of the disclosure.

[0045] Figure 6 A block diagram of a carbonate rock sedimentary paleogeographic reconstruction device provided in an embodiment of this disclosure.

[0046] In the accompanying drawings, the same parts are referred to by the same reference numerals, and the drawings are not drawn to scale. Detailed Implementation

[0047] To enable those skilled in the art to better understand the technical solutions of this disclosure, and to fully understand and implement the process of how this disclosure applies technical means to solve technical problems and achieve corresponding technical effects, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, not all embodiments. The embodiments of this disclosure and the various features within them can be combined with each other without conflict, and the resulting technical solutions are all within the protection scope of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort should fall within the protection scope of this disclosure.

[0048] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0049] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0050] Currently, traditional methods for ancient landform restoration can be categorized into residual thickness method, imprint method, and back-peeling method, among others.

[0051] The residual thickness method is one of the most commonly used methods for paleogeographic reconstruction. Its core idea is the negative correlation between residual stratum thickness and paleogeography: the thinner the residual stratum, the higher the corresponding paleogeography, and vice versa. This method is more suitable for clastic sedimentary strata deposited through a "filling" process. However, for carbonate strata deposited primarily in shallow marine environments, areas with lower-lying landforms tend to have deeper water, which is actually unfavorable for carbonate deposition, resulting in thinner strata. If the residual thickness method is used to reconstruct paleogeography of carbonate sedimentary strata, the opposite result will occur.

[0052] The core idea of ​​the imprinting method is to use the thickness of the unconformity overlying marker layer to mirror the undulations of paleogeography. A thicker overlying layer corresponds to a lower paleogeography, and vice versa. However, this method requires the overlying marker layer to be regionally stable, widely distributed, and untouched by tectonic changes. This method is suitable for carbonate karst landforms overlyed by clastic rock strata. It is unsuitable for situations where the sedimentary strata for paleogeography reconstruction are carbonate rocks, and the overlying strata are also carbonate rocks, but the overlying strata have been eroded.

[0053] The back-stripping method involves compacting and correcting the overlying strata at different depths to obtain the burial depth of the basement, and then reconstructing the paleomorphology based on the mirror principle. A major challenge in applying this method is the difficulty in restoring the thickness of overlying strata across multiple erosion phases, and currently there is no universally accepted and effective method for restoring the thickness of carbonate rock erosion over multiple phases and long periods.

[0054] It is evident that, due to the significantly different sedimentary environments of carbonate rocks compared to clastic rocks, and their susceptibility to dissolution, erosion, and weathering, reconstructing the paleogeography of carbonate strata during their depositional period using data on the thickness and distribution of overlying strata has considerable limitations.

[0055] In the carbonate rock sedimentary paleogeographic restoration method proposed in this application, carbonate rock sedimentation is strictly controlled by paleogeography. Under different geomorphic units, the lithology and lithofacies assemblages of the sediments have obvious indicative characteristics. Therefore, paleogeographic restoration is carried out based on the sedimentary characteristics of carbonate rocks themselves to solve the problems existing in the current technology.

[0056] Example 1

[0057] Figure 1 This is a schematic flowchart illustrating a method for reconstructing paleogeographic features from carbonate rock sedimentary deposits, provided as an embodiment of this disclosure. Figure 1 As shown, a method for paleogeographic reconstruction, wherein the paleogeographic features include carbonate sedimentary paleogeographic features, comprising:

[0058] Step 101: Obtain lithological information of carbonate rock strata, wherein the lithological information includes the lithological categories of the carbonate rock strata and the stratum thickness corresponding to each lithological category;

[0059] Step 102: Based on the lithology category and the stratum thickness corresponding to each lithology category, determine the elevation value of the first geomorphic unit of the carbonate rock strata;

[0060] Step 103: Based on the elevation value of the first geomorphic unit, reconstruct the paleogeography of the carbonate rock strata.

[0061] In the above method, the area where the work needs to be carried out is first selected as the study area, then the strata that need to be restored are determined as the target strata, and then a regional geological background survey is carried out on the target strata to clarify the tectonic sedimentary pattern and tectonic evolution characteristics during the deposition period, so as to obtain lithological and lithofacies information of carbonate strata.

[0062] In step 101, based on the logging interpretation results from the core calibration, the lithology of the target strata in each well in the study area is classified. This typically includes limestone and dolomite. If the depositional environment is more limited, gypsum and rock salt evaporite deposits may appear within carbonate rock sediments. If evaporites are indeed present, they are identified as well. For example, limestone, dolomite, gypsum, and rock salt can be numbered using the letters L, D, G, and H, respectively. Figure 2 The diagram shows the process of obtaining the formation thickness corresponding to each lithological category after determining the lithological types included in the target strata. For example, the cumulative thickness of limestone, dolomite, gypsum, and rock salt in the target strata of each individual well is calculated separately, and T is used as the reference. L TD T G T H It should be noted that other transitional lithological types may also exist; limestone, dolomite, gypsum rock, and rock salt are used as examples here.

[0063] In step 102, based on the aforementioned lithology and corresponding stratigraphic thickness, for example... Figure 2 The thickness of the strata corresponding to the dolomite and limestone is used to determine the elevation value of the geomorphic unit of the target stratum in this single well, i.e., the elevation value of the first geomorphic unit.

[0064] In step 103, the elevation values ​​of the first geomorphic unit of each single well are projected onto the plan view, contour lines are drawn, and the resulting paleotopographic map is then restored by color filling with automatic interpolation software.

[0065] Using the method disclosed in this embodiment, in the absence of a stable and widely deposited overlying clastic strata as a reference surface, a method for determining the elevation values ​​of geomorphic units based on lithological categories and their corresponding thicknesses is established through analysis of the target strata in each single well in the study area. This method can quantitatively calculate the elevation values ​​of geomorphic units in all single wells, and then project them onto a plane to delineate paleogeographic undulations, thereby obtaining the paleogeographic characteristics of the target strata and providing technical support for oil and gas exploration and development. Furthermore, this method is highly operable, intuitive, and clear in its identification, and has high application value.

[0066] Example 2

[0067] Based on the above embodiments, the elevation value of the first geomorphic unit of the carbonate rock strata is determined based on the lithology category and the stratum thickness corresponding to each lithology category, including:

[0068] Based on the lithology category and the formation thickness corresponding to each lithology category, the thickness ratio parameter is determined;

[0069] The elevation value of the first geomorphic unit is determined based on the thickness ratio parameter.

[0070] In this embodiment, the elevation value of the geomorphic unit of the target stratum is determined based on the proportional relationship between the thicknesses of strata of various lithological types.

[0071] Example 3

[0072] Based on the above embodiments, a thickness ratio parameter is determined based on the lithology category and the formation thickness corresponding to each lithology category, including:

[0073] One of the lithological categories is designated as the reference lithological category;

[0074] The thickness ratio parameter is determined based on the following formula:

[0075]

[0076] Among them, R i T represents the thickness ratio parameter corresponding to each lithological category other than the reference lithological category. ref T represents the formation thickness corresponding to the reference lithology category. i The stratum thickness is the thickness of each lithology category other than the reference lithology category, where i is an integer and 1≤i≤N-1, and N is the number of lithology categories.

[0077] Based on the sedimentary environments of different lithologies, the dolomite after the Sinian System belongs to a secondary transitional rock type. Therefore, dolomite is selected as the reference lithology. The cumulative thickness ratio of dolomite to other different lithologies in the target strata of each single well is calculated and represented by the symbols R1, R2, R3, etc., i.e.:

[0078] R1 = T D / (T D +T L R2 = T D / (T D +T G ), R3 = T D / (T D +T H ).

[0079] In this embodiment, N is 4, T ref That is, T D , where represents the stratum thickness corresponding to dolomite. By calculating the above thickness ratio parameter, the thickness ratio of different rock types can be obtained, and this parameter can be used to obtain the elevation value of geomorphic units more accurately.

[0080] Example 4

[0081] Based on the above embodiments, determining the elevation value of the first geomorphic unit based on the thickness ratio parameter includes:

[0082] The elevation value of the first geomorphic unit is determined based on the following formula:

[0083]

[0084] Where X1 is the elevation value of the first geomorphic unit, C i λ represents the weight of each lithology category other than the reference lithology category, and λ is the baseline number.

[0085] λ is the base number, which can usually be an integer multiple of 1, or 0.1, 0.01, etc., and can be selected according to the specific situation to facilitate calculation. C i These are the weights for each lithology category other than the reference lithology category. For example, C1, C2, and C3 are the weights for limestone, gypsum, and rock salt, respectively. When λ is 0.1, the value of C1 can be 80-120, the value of C2 can be 20-40, and the value of C3 can be 10-20.

[0086] Using the elevation values ​​of the first geomorphic unit obtained from each individual well based on the above method, contour maps were drawn, such as... Figure 3 As shown in the figure. The above formula takes into account the corresponding thickness relationships of various lithological types included in the carbonate rock strata, thus obtaining a more accurate elevation value for the first geomorphic unit.

[0087] Example 5

[0088] Based on the above embodiments, the method further includes:

[0089] Obtain the lithofacies information of the carbonate rock strata;

[0090] The process of reconstructing the paleogeography of the carbonate rock strata based on the elevation value of the first geomorphic unit includes:

[0091] Based on the lithofacies information, the elevation value of the first geomorphic unit is adjusted to obtain the elevation value of the second geomorphic unit;

[0092] Based on the elevation value of the second geomorphic unit, the paleogeography of the carbonate rock strata is reconstructed.

[0093] Different lithofacies in carbonate rocks indicate specific sedimentary landforms. For example, grainy lithofacies indicate grainy shoal landforms, which are relatively high; while sedimentary landforms of dark-colored rocks are lower than those of light-colored rocks. Therefore, by adjusting the elevation values ​​of geomorphic units determined based on lithological information in different wells according to their specific lithofacies characteristics, adjusted elevation values ​​of geomorphic units can be obtained, thus enabling more accurate reconstruction of paleogeography.

[0094] Example 6

[0095] Based on the above embodiments, the lithofacies information includes the lithofacies category of the carbonate rock strata and the stratum thickness corresponding to the lithofacies category;

[0096] The step of adjusting the elevation value of the first geomorphic unit based on the lithofacies information to obtain the elevation value of the second geomorphic unit includes:

[0097] Based on the lithofacies information, determine the ratio of the thickness of the strata corresponding to the lithofacies category to the total thickness of the carbonate strata;

[0098] Based on the ratio and the lithofacies category, the elevation adjustment value is determined;

[0099] Based on the elevation adjustment value, the elevation value of the first geomorphic unit is adjusted to obtain the elevation value of the second geomorphic unit.

[0100] As mentioned above, some lithofacies categories indicate higher landforms, while others indicate lower landforms. Therefore, the elevation values ​​of the first geomorphic unit need to be adjusted for different lithofacies categories. Generally speaking, lithofacies categories indicating higher landforms include: light-colored rocks, grainstone facies, and stromatolite facies. Among these, the landforms indicated by light-colored rocks are higher than those indicated by grainstone facies, and the landforms indicated by grainstone facies are higher than those indicated by stromatolite facies. Lithofacies categories indicating lower landforms include: dark-colored rocks.

[0101] When determining the elevation adjustment value based on the ratio and the lithofacies category, it can be obtained by: ratio * lithofacies parameter * λ, where the lithofacies parameter is determined based on the lithofacies category. For example, the lithofacies parameter for light-colored rocks is set to 15-20, for grain facies to 10-15, for stromatolitic facies to 5-10, and for dark-colored rocks to 8-12.

[0102] Specifically, when determining the elevation adjustment value, lithofacies parameters are determined based on the lithofacies category. Then, based on the lithofacies parameters, the elevation adjustment value is calculated using the formula ratio * lithofacies parameter * λ. For lithofacies categories indicating higher landforms, the elevation adjustment value is added to the elevation value of the first geomorphic unit to obtain the elevation value of the second geomorphic unit; for lithofacies categories indicating lower landforms, the elevation adjustment value is subtracted from the elevation value of the first geomorphic unit to obtain the elevation value of the second geomorphic unit. Contour maps are then drawn using the second geomorphic unit elevation values ​​obtained from the above method for each single well, as shown below. Figure 4 As shown.

[0103] The elevation values ​​of the second geomorphic unit obtained by the above method take into account the influence of different lithologies and rock pairs on the elevation values ​​of the geomorphic unit, and adjust the elevation values ​​of the geomorphic unit based on the ratio of the thickness of the corresponding rock pair to the carbonate rock strata, so as to more accurately restore the paleogeography.

[0104] Example 7

[0105] Based on the above embodiments, this embodiment provides an application example. In this application example, the above method is used to reconstruct the sedimentary paleogeography of the fourth member of the Majiagou Formation in the Lower Paleozoic Era of the Ordos Basin. Specifically, it includes the following steps:

[0106] (1) The fourth member of the Lower Paleozoic Majiagou Formation in the Ordos Basin was selected as the target stratum for geomorphological restoration, and then a regional geological background survey was conducted to obtain the tectonic sedimentary pattern and tectonic evolution characteristics of its depositional period.

[0107] (2) Based on the logging results from the core calibration of each well in the study area of ​​the fourth section of the Majiagou Formation, lithology was classified. For example, a single well included limestone and dolomite, which were numbered with the letters L and D respectively. Figure 2 As shown. The thicknesses of limestone and dolomite in the target strata of each single well were calculated to be 279.5 and 161.06 mm, respectively, and expressed in English as T. L T D express.

[0108] (3) Selecting dolomite as the reference lithology, calculate the thickness ratio parameter of limestone other than dolomite in the target strata of each single well, and represent it with the code R1, i.e.

[0109] R1 = T D / (T D +T L ),

[0110] The calculated R1 using the above formula is 279.5 / 440.56 = 0.63. Since... Figure 2 In the example shown, there is no gypsum rock or rock salt, so R2 and R3 are both 1.

[0111] (4) Set the baseline λ to a constant of 0.1, and the weight corresponding to limestone to 100. Calculate the elevation value of the first geomorphic unit: X1 = (R i -1)×C i ×λ, we get X1 as -3.7.

[0112] (5) Obtain the lithofacies information of a single well. Its lithofacies type is granular rock, and the ratio of its thickness to the total thickness of the carbonate strata is 50%. The lithofacies parameter of the granular rock is set to 10. Then the elevation adjustment value = 50% * 10 * 0.1 = 0.5. Adjust the elevation value of the first geomorphic unit -3.7 by 0.5 to obtain the elevation value of the second geomorphic unit -3.2.

[0113] (6) Using the steps described above, the elevation values ​​of the second geomorphic unit of each single well in the study area of ​​the four sections of the Majiagou Formation were obtained, and contour maps, i.e., paleotopographic maps, were drawn accordingly, such as... Figure 4 As shown. Then, after filling in the colors using automatic interpolation software, the final sedimentary paleogeographic map is obtained, as shown. Figure 5 As shown, this figure accurately reconstructs the sedimentary paleogeography of the fourth member of the Majiagou Formation in the Lower Paleozoic Era of the Ordos Basin.

[0114] Using the method provided in this embodiment, in the absence of a stable and widely deposited overlying clastic strata as a reference level, a method based on lithological division and lithological thickness ratio calculation is established through the analysis of target strata in each single well in the study area. This method can quantitatively calculate the geomorphic elevation values ​​of all single wells. Then, lithofacies analysis is used to adjust the elevation values ​​of geomorphic units, resulting in adjusted elevation values ​​for each geomorphic unit. This delineates the paleogeographic undulations and obtains the paleogeographic characteristics of the target strata, providing technical support for oil and gas exploration and development. Furthermore, the method provided in this embodiment is highly operable, intuitive, and clear in its identification, and has high application value.

[0115] Example 8

[0116] Based on the above embodiments, this embodiment provides a paleomorphological restoration device, wherein the paleomorphological features include carbonate sedimentary paleomorphological features, such as... Figure 6 As shown, it includes:

[0117] The acquisition unit 601 is used to acquire lithological information of carbonate rock strata, the lithological information including the lithological categories of the carbonate rock strata and the strata thickness corresponding to each lithological category;

[0118] The determining unit 602 is used to determine the elevation value of the first geomorphic unit of the carbonate rock strata based on the lithology and the stratum thickness corresponding to each lithology.

[0119] The restoration unit 603 is used to restore the paleogeography of the carbonate rock strata based on the elevation value of the first geomorphic unit.

[0120] In some embodiments of this example, the determining unit is further configured to:

[0121] Based on the lithology category and the formation thickness corresponding to each lithology category, the thickness ratio parameter is determined;

[0122] The elevation value of the first geomorphic unit is determined based on the thickness ratio parameter.

[0123] In some embodiments of this example, the determining unit is further configured to:

[0124] One of the lithological categories is designated as the reference lithological category;

[0125] The thickness ratio parameter is determined based on the following formula:

[0126]

[0127] Among them, R i T represents the thickness ratio parameter corresponding to each lithological category other than the reference lithological category.ref T represents the formation thickness corresponding to the reference lithology category. i The stratum thickness is the thickness of each lithology category other than the reference lithology category, where i is an integer and 1≤i≤N-1, and N is the number of lithology categories.

[0128] In some embodiments of this example, the determining unit is further configured to:

[0129] The elevation value of the first geomorphic unit is determined based on the following formula:

[0130]

[0131] Where X1 is the elevation value of the first geomorphic unit, C i λ represents the weight of each lithology category other than the reference lithology category, and λ is the baseline number.

[0132] In some embodiments of this example, the acquisition unit is further configured to:

[0133] Obtain the lithofacies information of the carbonate rock strata;

[0134] The recovery unit is also used for:

[0135] Based on the lithofacies information, the elevation value of the first geomorphic unit is adjusted to obtain the elevation value of the second geomorphic unit;

[0136] Based on the elevation value of the second geomorphic unit, the paleogeography of the carbonate rock strata is reconstructed.

[0137] In some embodiments of this example, the lithofacies information includes the lithofacies category of the carbonate rock strata and the stratum thickness corresponding to the lithofacies category;

[0138] The recovery unit is also used for:

[0139] Based on the lithofacies information, determine the ratio of the thickness of the strata corresponding to the lithofacies category to the total thickness of the carbonate strata;

[0140] Based on the ratio and the lithofacies category, the elevation adjustment value is determined;

[0141] Based on the elevation adjustment value, the elevation value of the first geomorphic unit is adjusted to obtain the elevation value of the second geomorphic unit.

[0142] Example 9

[0143] Based on the above embodiments, this embodiment provides a computer device, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method described in the above embodiments.

[0144] In some embodiments of this example, a computer-readable storage medium is provided, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the steps of the method described in the above embodiments.

[0145] In some embodiments of this example, a computer program product is provided, including a computer program / instructions, characterized in that the computer program, when executed by a processor, implements the steps of the method described in the above embodiments.

[0146] The processor may include, but is not limited to, one or more processors or microprocessors. Each processor may be implemented as an Application Specific Integrated Circuit (ASIC), Digital Signal Processor (DSP), Digital Signal Processing Device (DSPD), Programmable Logic Device (PLD), Field Programmable Gate Array (FPGA), controller, microcontroller, microprocessor, or other electronic component, for executing the methods described in the above embodiments.

[0147] Computer-readable storage media can be implemented by any type of volatile or non-volatile storage device or a combination thereof. Computer-readable storage media may include, but are not limited to, random access memory (RAM), read-only memory (ROM), flash memory, EPROM memory, EEPROM memory, registers, computer storage media (e.g., hard disk, floppy disk, solid-state drive, removable disk, CD-ROM, DVD-ROM, Blu-ray disc, etc.).

[0148] Computer-readable storage media may also store at least one computer-executable program / instruction, such as computer-readable instructions. Computer-readable storage media include, but are not limited to, volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory. Computer-readable storage media may include, for example, read-only memory (ROM), hard disk, flash memory, etc. For example, a non-transitory computer-readable storage medium may be connected to a computing device such as a computer, and then, when the computing device executes the computer-readable instructions stored on the computer-readable storage medium, the various methods described above can be performed.

[0149] In addition, the computer device may include (but is not limited to) a data bus, an input / output (I / O) bus, a display, and input / output devices (e.g., keyboard, mouse, speakers, etc.).

[0150] The processor can communicate with external devices via the I / O bus through wired or wireless networks.

[0151] In one embodiment, the at least one computer-executable instruction may also be compiled into or comprise a software product / computer program product, wherein one or more computer-executable instructions are executed by a processor to perform the steps of the various functions and / or methods in the embodiments described herein.

[0152] In the embodiments provided in this disclosure, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0153] It should be noted that, in this disclosure, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element limited by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0154] While the embodiments disclosed herein are as described above, the foregoing content is merely for the purpose of facilitating understanding of this disclosure and is not intended to limit this disclosure. Any person skilled in the art to which this disclosure pertains may make any modifications and changes in form and detail of the implementation without departing from the spirit and scope of this disclosure; however, the scope of patent protection of this disclosure shall still be determined by the scope defined in the appended claims.

Claims

1. A method for paleogeographic reconstruction, wherein the paleogeographic features include carbonate sedimentary paleogeographic features, characterized in that, include: Obtain lithological information of carbonate rock formations, wherein the lithological information includes the lithological categories of the carbonate rock formations and the formation thickness corresponding to each lithological category; Based on the lithology category and the stratum thickness corresponding to each lithology category, the elevation value of the first geomorphic unit of the carbonate rock strata is determined; Based on the elevation value of the first geomorphic unit, the paleogeography of the carbonate rock strata is reconstructed.

2. The method according to claim 1, characterized in that, The determination of the elevation value of the first geomorphic unit of the carbonate rock strata based on the lithology and the corresponding stratigraphic thickness includes: Based on the lithology category and the formation thickness corresponding to each lithology category, the thickness ratio parameter is determined; The elevation value of the first geomorphic unit is determined based on the thickness ratio parameter.

3. The method according to claim 2, characterized in that, The determination of thickness ratio parameters based on the lithology category and the corresponding formation thickness for each lithology category includes: One of the lithological categories is designated as the reference lithological category; The thickness ratio parameter is determined based on the following formula: Among them, R i T represents the thickness ratio parameter corresponding to each lithological category other than the reference lithological category. ref T represents the formation thickness corresponding to the reference lithology category. i The stratum thickness is the thickness of each lithology category other than the reference lithology category, where i is an integer and 1≤i≤N-1, and N is the number of lithology categories.

4. The method according to claim 3, characterized in that, Determining the elevation value of the first geomorphic unit based on the thickness ratio parameter includes: The elevation value of the first geomorphic unit is determined based on the following formula: Where X1 is the elevation value of the first geomorphic unit, C i λ represents the weight of each lithology category other than the reference lithology category, and λ is the baseline number.

5. The method according to any one of claims 1-4, characterized in that, The method further includes: Obtain the lithofacies information of the carbonate rock strata; The process of reconstructing the paleogeography of the carbonate rock strata based on the elevation value of the first geomorphic unit includes: Based on the lithofacies information, the elevation value of the first geomorphic unit is adjusted to obtain the elevation value of the second geomorphic unit; Based on the elevation value of the second geomorphic unit, the paleogeography of the carbonate rock strata is reconstructed.

6. The method according to claim 5, characterized in that, The lithofacies information includes the lithofacies category of the carbonate rock strata and the strata thickness corresponding to the lithofacies category; The step of adjusting the elevation value of the first geomorphic unit based on the lithofacies information to obtain the elevation value of the second geomorphic unit includes: Based on the lithofacies information, determine the ratio of the thickness of the strata corresponding to the lithofacies category to the total thickness of the carbonate strata; Based on the ratio and the lithofacies category, the elevation adjustment value is determined; Based on the elevation adjustment value, the elevation value of the first geomorphic unit is adjusted to obtain the elevation value of the second geomorphic unit.

7. A paleogeographic restoration device, wherein the paleogeographic features include carbonate sedimentary paleogeographic features, characterized in that, include: The acquisition unit is used to acquire lithological information of carbonate rock strata, the lithological information including the lithological categories of the carbonate rock strata and the stratum thickness corresponding to each lithological category; A determining unit is used to determine the elevation value of the first geomorphic unit of the carbonate rock strata based on the lithology category and the stratum thickness corresponding to each lithology category; The restoration unit is used to restore the paleogeography of the carbonate rock strata based on the elevation value of the first geomorphic unit.

8. A computer device, comprising a memory, a processor, and a computer program stored in the memory, characterized in that, The processor executes the computer program to implement the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the steps of the method according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When executed by a processor, the computer program implements the steps of the method according to any one of claims 1 to 6.

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