A quantitative recovery method of paleo-water depth

Abstract

The application discloses a quantitative recovery method of paleo-water depth. The method comprises the following steps: determining a marker section of a target well; calculating relative paleo-water depth values of each logging section in the target well according to logging data of the target well; determining an absolute paleo-water depth value of the marker section according to characteristic information in the marker section; correcting the relative paleo-water depth values of each logging section according to the relative paleo-water depth values of each logging section, the relative paleo-water depth value of the marker section and the absolute paleo-water depth value of the marker section, so as to obtain absolute paleo-water depth values of each logging section; and combining the logging data with the paleo-water depth values calibrated by paleontology, so that continuous quantitative calculation of the paleo-water depth in the vertical direction is realized, which is helpful to determine the lower limit value of the paleo-water depth for forming high-quality shale in a deep layer, promotes the evaluation and optimization of a favorable shale area in a deep water area, and can more efficiently utilize the logging data and the paleontology data to quickly recover the vertical sedimentary paleo-water depth values.

Description

Technical Field

[0001] This invention relates to the field of geological exploration technology, and in particular to a method for quantitatively reconstructing ancient water depth. Background Technology

[0002] Currently, shale gas has become an important area for the growth of natural gas production in my country. Vigorously developing shale gas is of great significance for meeting my country's continuously and rapidly growing energy demand and for the clean and efficient utilization of energy. With the continuous development of shale gas geological theory and the continuous progress of exploration and development technologies, large-scale and efficient shale gas development has been achieved, and a major shale gas production area with reserves of trillions of cubic meters and outputs of tens of billions of cubic meters has been established. Along with the successful development of shallow and medium-depth shale gas, the increase in shale gas reserves and production is gradually advancing towards deeper layers and has achieved breakthroughs. With the deepening of exploration, the industry has formed the understanding that deep-water areas control the development of high-quality shale, while research on paleowater depth is relatively limited. Paleowater depth is a major influencing factor on the characteristics of various biological, chemical, and physical parameters in the marine environment, and determines many fundamental conditions affecting the formation of organic-rich shale, such as marine primary productivity, water redox properties, and sedimentation rates. Therefore, research on paleowater depth is of great significance for promoting the study of the formation mechanism of high-quality shale, evaluating favorable shale areas in deep water, and promoting the rapid development of deep-layer shale gas.

[0003] Currently, the main methods for reconstructing paleowater depths include sedimentological methods, geochemical methods, paleontological methods, and well logging methods. These methods are mostly qualitative or semi-quantitative in determining the range of paleowater depth variations. Specifically: sedimentological methods qualitatively determine paleowater depth based on various indicators such as sedimentary thickness and sedimentary structures; geochemical methods mainly utilize U and Th curves, the relationship between Th / U ratios and redox conditions, and the relationship between redox conditions and water depth to indirectly obtain the range of paleowater depth; paleontological methods mainly infer water depth based on biological remains, the depth of water bodies inhabited by calcareous algae, coral communities, benthic animals, and ostracods; and well logging methods mainly use U and Th curves, which are related to the redox conditions of the water body, to calculate relative water depth. The methods described above are commonly used for paleowater depth reconstruction and provide useful information. While some research results have been achieved, several shortcomings remain: For example, using well logging GR curves to reconstruct paleowater depth in lake basins reduces accuracy by using the same fixed value across the same target stratigraphic section throughout the region; the method of obtaining paleolake depth by reading individual sandbar thicknesses from drilling and logging data and then summing these thicknesses is only suitable for terrestrial sediments and cannot be applied to marine facies; predicting paleowater depth by screening lakes similar to present-day lakes and using the quantitative relationship between geochemical elements and water depth requires extensive and intensive sampling, resulting in high costs; and calculating relative paleowater depth based on elemental characteristics lacks quantitative basis. Overall, research on quantitative paleowater depth reconstruction and reconstruction, as well as the spatiotemporal evolution of paleowater depth, remains severely lacking. Summary of the Invention

[0004] In view of the above problems, the present invention is proposed to provide a method for quantitatively reconstructing paleowater depth that overcomes or at least partially solves the above problems.

[0005] In a first aspect, embodiments of the present invention provide a method for quantitatively reconstructing ancient water depth, comprising:

[0006] Identify the marker interval for the target well;

[0007] Based on the logging data of the target well, calculate the relative paleowater depth of each logging segment in the target well;

[0008] The absolute paleowater depth of the marker layer is determined based on the feature information in the marker layer.

[0009] Based on the relative paleowater depth values ​​of each logging segment, the relative paleowater depth values ​​of the marker segment, and the absolute paleowater depth values ​​of the marker segment, the relative paleowater depth values ​​of each logging segment are corrected to obtain the absolute paleowater depth values ​​of each logging segment.

[0010] In one embodiment, calculating the relative paleowater depth of each logging segment in the target well based on the logging data of the target well includes:

[0011] Based on the U-values ​​of each logging node within the depth range of each logging segment recorded in the logging U-curve of the target well logging data, the relative paleowater depth of each logging segment in the target well is calculated according to the first calculation formula.

[0012] The first calculation formula is:

[0013]

[0014] In the above formula, D represents the relative paleowater depth of each logging segment; n represents the number of logging nodes within the depth range of each logging segment; i represents the order of the logging nodes within the depth range of each logging segment; w(U) i This represents the U value of each logging node within the depth range of each logging segment.

[0015] In one embodiment, the relative paleowater depth values ​​of each logging interval and the relative paleowater depth values ​​of the marker interval include:

[0016] Based on the depth range of the marker layer, the relative paleowater depth of each logging layer and the relative paleowater depth of the marker layer are determined.

[0017] In one embodiment, determining the absolute paleowater depth of the marker layer based on feature information in the marker layer includes:

[0018] Based on the core data from the target well and the fossil characteristics information in the marker layer, a query is performed in a pre-set Earth biodiversity database to determine the absolute paleowater depth of the marker layer.

[0019] In one embodiment, the relative paleowater depth values ​​of each logging segment are corrected based on the determined relative paleowater depth values ​​and absolute paleowater depth values ​​of the marker segments to obtain the absolute paleowater depth values ​​of each logging segment, including:

[0020] Based on the determined relative paleowater depth and absolute paleowater depth of the marker interval, the relative paleowater depth of each logging interval is corrected according to the second calculation formula to obtain the absolute paleowater depth of each logging interval.

[0021] The second calculation formula is:

[0022] H = D × H g / D g ;

[0023] In the above formula, H represents the absolute paleowater depth of each logging segment; D represents the relative paleowater depth of each logging segment; H g D represents the absolute paleowater depth of the marker stratigraphic section; g This indicates the relative paleowater depth of the marker layer.

[0024] In one embodiment, after determining the marker interval of the target well, the method further includes:

[0025] Based on the logging data of the target well, determine the logging response characteristics of the marker interval in the target well;

[0026] Based on the logging response characteristics of the marker interval in the target well and the logging response characteristics of each uncored well in the area where the target well is located, the marker interval of each uncored well is determined.

[0027] Calculate the relative paleowater depth values ​​for each logging segment of each well for which no core was taken;

[0028] Determine the absolute paleowater depth of the marker stratigraphic intervals for each of the uncored wells;

[0029] Based on the relative paleowater depth values ​​of each logging segment of each unextracted core well, which include the relative paleowater depth values ​​of the marker segments of each unextracted core well, and the absolute paleowater depth values ​​of the marker segments of each unextracted core well, the relative paleowater depth values ​​of each logging segment of each unextracted core well are corrected to obtain the absolute paleowater depth values ​​of each logging segment of each unextracted core well.

[0030] In one embodiment, determining the marker interval of the target well includes:

[0031] Identify the Guanyinqiao Formation or the graptolite zone of the Longmaxi Formation in the target well.

[0032] Secondly, embodiments of the present invention provide a quantitative reconstruction device for ancient water depth, comprising:

[0033] The first determining module is used to determine the marker interval of the target well;

[0034] The calculation module is used to calculate the relative paleowater depth of each logging segment in the target well based on the logging data of the target well.

[0035] The second determining module is used to determine the absolute paleowater depth value of the marker layer based on the feature information in the marker layer.

[0036] The correction module is used to correct the relative paleowater depth values ​​of each logging segment based on the relative paleowater depth values ​​of the marker segments included in the relative paleowater depth values ​​of each logging segment, and the absolute paleowater depth values ​​of the marker segments, so as to obtain the absolute paleowater depth values ​​of each logging segment.

[0037] Thirdly, embodiments of the present invention provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the aforementioned method for quantitatively reconstructing ancient water depth.

[0038] Fourthly, embodiments of the present invention provide a computer program product, the computer program product including a computer program, which, when executed by a processor, implements the aforementioned method for quantitatively restoring ancient water depth.

[0039] The beneficial effects of the above-described technical solutions provided in the embodiments of the present invention include at least the following:

[0040] The quantitative method for recovering paleowater depth provided in this invention combines well logging data with paleowater depth values ​​calibrated by paleontology, enabling continuous quantitative calculation of paleowater depth in the vertical direction. This solves the problems of traditional well logging methods, which can only continuously determine relative water depth in the vertical direction, and single paleontological methods, which can only quantify paleowater depth in certain strata. Using the method provided by this invention to calculate paleowater depth helps determine the lower limit of paleowater depth for the formation of high-quality deep shale, promotes the evaluation and selection of favorable shale areas in deep water regions, and facilitates theoretical research on the formation mechanism of high-quality shale. It can also more efficiently utilize well logging data and paleontological data to quickly recover vertical sedimentary paleowater depth values.

[0041] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0042] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0043] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0044] Figure 1 This is a flowchart of the quantitative reconstruction method for ancient water depth in an embodiment of the present invention;

[0045] Figure 2 This is a flowchart illustrating the process of restoring the paleowater depth of the Longmaxi Formation shale deposits in an embodiment of the present invention;

[0046] Figure 3 This is a schematic diagram illustrating the relationship between measured U content and depth in an embodiment of the present invention;

[0047] Figure 4This is a schematic diagram illustrating the correspondence between the logging U-curve and TOC in an embodiment of the present invention;

[0048] Figure 5 This is a schematic diagram of the relative paleowater depth and actual paleowater depth of the Longmaxi Formation in Well W202 in an embodiment of the present invention;

[0049] Figure 6 This is a structural block diagram of the ancient water depth quantitative restoration device in an embodiment of the present invention. Detailed Implementation

[0050] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0051] To better calculate paleowater depth values ​​vertically within a logging area, this invention combines logging data with paleontological data to provide a quantitative method for reconstructing paleowater depth. (Refer to...) Figure 1 As shown, the method includes the following steps:

[0052] S11. Determine the marker section of the target well;

[0053] S12. Based on the logging data of the target well, calculate the relative paleowater depth of each logging segment in the target well;

[0054] S13. Determine the absolute paleowater depth of the marker layer based on the characteristic information in the marker layer;

[0055] S14. Based on the relative paleowater depth of each logging segment, the relative paleowater depth of the marker segment, and the absolute paleowater depth of the marker segment, the relative paleowater depth of each logging segment is corrected to obtain the absolute paleowater depth of each logging segment.

[0056] In the above method, the target well is a well in the study area where core samples have been taken. First, the location of the marker layer of the target well is determined, for example, by core observation. Then, based on the logging data of the target well, the relative paleowater depth values ​​corresponding to each logging layer in the target well are calculated. Since each logging layer of the target well also includes the marker layer, the relative paleowater depth value of the marker layer can be obtained. Then, based on the characteristic information in the marker layer, the absolute paleowater depth value of the marker layer is determined. Finally, based on the determined relative and absolute paleowater depth values ​​of the marker layer, the relative paleowater depth values ​​of other logging layers in the target well, excluding the marker layer, are corrected to obtain the absolute paleowater depth value of each logging layer, thus achieving quantitative recovery of paleowater depth.

[0057] The quantitative method for reconstructing paleowater depth provided in this invention can be used for quantitative research on paleowater depth of marine shale sediments in any block or region in my country. It can be used by personnel engaged in shale exploration, and researchers engaged in terrestrial or marine-continental transitional shale can also refer to the above method to conduct quantitative research on paleowater depth of terrestrial or marine-continental transitional shale. It has a wide range of applications.

[0058] Furthermore, in step S12 above, the relative paleowater depth values ​​of each logging segment in the target well are calculated in the following manner:

[0059] Based on the U values ​​of each logging node within the depth range of each logging segment recorded in the logging U (uranium) curve of the target well, the relative paleowater depth of each logging segment in the target well is calculated according to the first calculation formula below.

[0060] The first calculation formula is:

[0061]

[0062] In the above formula, D represents the relative paleowater depth of each logging segment; n represents the number of logging nodes within the depth range of each logging segment; i represents the order of the logging nodes within the depth range of each logging segment; w(U) i This represents the U value of each logging node within the depth range of each logging segment.

[0063] The above-mentioned logging U-curve is a logging curve for uranium obtained from elemental logging. It records the U-values ​​of each logging node within the depth range of each logging segment. Based on the U-values ​​of these logging nodes, the relative paleowater depth of each logging segment can be calculated using the first calculation formula mentioned above. For example, if the depth range of the first logging segment contains 100 logging nodes, and each logging node has a corresponding U-value, the relative paleowater depth of the first logging segment can be calculated based on the U-values ​​of the 100 logging nodes. Similarly, the relative paleowater depth of all logging segments can be calculated.

[0064] Furthermore, in step S14 above, the relative paleowater depth values ​​of each logging interval and the relative paleowater depth values ​​of the marker interval are determined in the following manner:

[0065] Based on the depth range of the marker layer, the relative paleowater depth values ​​of each logging layer and the relative paleowater depth values ​​of the marker layer are determined.

[0066] Each logging segment has its corresponding depth range. Based on the determined depth range of the marker segment, the relative paleowater depth of the marker segment can be determined from the relative paleowater depth of each logging segment.

[0067] Furthermore, in step S13 above, the absolute paleowater depth of the marker layer is determined in the following manner:

[0068] Based on the data from the core samples taken from the target well and the fossil characteristics information in the marker stratigraphic section, a query is performed in the pre-set Earth biodiversity database to determine the absolute paleowater depth of the marker stratigraphic section.

[0069] The core data from the target well contains the characteristics of benthic fossil assemblages in the marker layer. Based on the information of these fossil characteristics, the absolute paleowater depth of the marker layer can be determined by querying the pre-set Earth biodiversity database.

[0070] Furthermore, the relative paleowater depth values ​​of each logging interval were corrected using the following method:

[0071] Based on the determined relative paleowater depth and absolute paleowater depth of the marker interval, the relative paleowater depth of each logging interval is corrected according to the second calculation formula below to obtain the absolute paleowater depth of each logging interval.

[0072] The second calculation formula is:

[0073] H = D × H g / D g ;

[0074] In the above formula, H represents the corrected absolute paleowater depth of each logging segment; D represents the relative paleowater depth of each logging segment; H g Indicates the absolute paleowater depth of the marker stratigraphic section; D g This indicates the relative paleowater depth of the marker stratigraphic section.

[0075] Furthermore, after identifying the marker interval of the target well, the above method may also include the following steps:

[0076] Based on the logging data of the target well, determine the logging response characteristics of the marker interval in the target well;

[0077] Based on the logging response characteristics of the marker intervals in the target well and the logging response characteristics of each uncored well in the area where the target well is located, the marker intervals of each uncored well are determined.

[0078] Calculate the relative paleowater depth for each logging segment in each well where no core was taken;

[0079] Determine the absolute paleowater depth of the marker stratigraphic intervals for each uncored well;

[0080] Based on the relative paleowater depth values ​​of each logging segment in each unextracted core well, which include the relative paleowater depth values ​​of the marker segments, and the absolute paleowater depth values ​​of the marker segments, the relative paleowater depth values ​​of each logging segment in each unextracted core well are corrected to obtain the absolute paleowater depth values ​​of each logging segment in each unextracted core well. The specific calculation process can be found in the second calculation formula mentioned above.

[0081] In the above steps, the logging response characteristics of the marker layer are its electrical characteristics. Within the study area where the target well is located, the target well is the well with core samples taken, and the other wells are the wells without core samples taken. After logging, each uncored well will generate corresponding logging response characteristics. By comparing the logging response characteristics of the marker layer in the target well with the logging response characteristics of each uncored well, the marker layer of each uncored well can be determined. According to the first calculation formula mentioned above, the relative paleowater depth of each logging layer of each uncored well can be calculated in the same way. According to the same method mentioned above, the absolute paleowater depth of the marker layer of each uncored well can also be determined. Then, using the same method mentioned above and the second calculation formula mentioned above, the relative paleowater depth of each logging layer of each uncored well is corrected to obtain the absolute paleowater depth of each logging layer of each uncored well. Through the above steps, the quantitative recovery of the paleowater depth of all wells in the study area is achieved.

[0082] Furthermore, the marker stratigraphic interval of the target well can be determined, for example, by identifying the Guanyinqiao Formation or the graptolite zone of the Longmaxi Formation. Of course, the present invention is not limited to the aforementioned fossil stratigraphic zones.

[0083] The quantitative method for reconstructing paleowater depth provided in this invention is applicable to the quantitative and continuous prediction of sedimentary paleowater depth. U (urethane) has a residence time of 450 kyrs in the ocean. Due to the very slow deposition rate of shale, the abundance of U in sediments can reflect the variation characteristics of U caused by the paleooceanic sedimentary environment. The measured U content in the study area increases monotonically with increasing depth. U and total organic carbon (TOC) content show a significant positive correlation, and TOC is also significantly positively correlated with redox indices, reflecting that TOC is mainly controlled by the redox environment. In the shelf area, oxygen content decreases with increasing water depth, leading to increased reducing power with increasing depth, ultimately resulting in higher TOC. Therefore, U content can reflect the vertical trend relative to water depth. Different benthic animal communities live in different water depth zones. Taking the Guanyinqiao Formation as an example, since the Guanyinqiao Formation is a argillaceous limestone with a large difference in lithology from the Longmaxi Formation, it is rich in shell fossils and can be well identified in downhole cores and logging responses. Moreover, the current Geobiodiversity Database (GBDB) has detailed the paleotopography, thickness, and paleowater depth of the Guanyinqiao Formation during its deposition period. Therefore, in this embodiment of the invention, the Guanyinqiao Formation can be selected as a marker layer to correct the relative paleowater depth reflected by the logging U, thereby obtaining a vertically continuous paleowater depth variation.

[0084] To better illustrate the quantitative method for restoring paleowater depth in the embodiments of the present invention, a specific example is given below to demonstrate the actual restoration of paleowater depth in the Longmaxi Formation shale deposits in southern Sichuan:

[0085] The process of continuously and quantitatively reconstructing the paleowater depth of the Longmaxi Formation in this embodiment of the invention is described with reference to... Figure 2 As shown, it includes the following steps:

[0086] ① In the southern Sichuan region, where the paleowater depth needs to be restored, gamma-ray spectrometry logging was conducted on shale gas wells, referring to... Figure 3 As shown, the measured U element content and depth clearly show a monotonically increasing relationship, and with reference to... Figure 4 As shown, there is a clear correlation between the U element content and the TOC organic matter content in well logging, indicating that the U element content in well logging can reflect the relative depth changes of paleowater, and the U value of shale is read from the paleowater depth section to be restored. Based on the above first calculation formula to establish the relationship between relative paleowater depth and U value, the relative paleowater depth value of well W202 in southern Sichuan can be determined, and the relative paleowater depth value of the Guanyinqiao layer (marker layer) in well W202 is determined to be 91;

[0087] ②Reference Figure 5 As shown, the Guanyinqiao Formation of well W202 in southern Sichuan was delineated through core and fossil identification. The Guanyinqiao Formation was used as a marker layer, and the logging curve characteristics of the Guanyinqiao Formation were determined so as to calibrate the Guanyinqiao Formation in wells without core samples.

[0088] ③Based on the characteristics of the benthic fossil assemblage in the Guanyinqiao Formation and in conjunction with the GBDB Earth Biodiversity Database, the absolute paleowater depth of the Guanyinqiao Formation in Well W202 was determined to be 15m;

[0089] ④ The relative paleowater depth of well W202 is corrected according to the second calculation formula mentioned above, with reference to... Figure 5 As shown, continuous quantitative actual water depth values ​​(absolute paleowater depth values) can be obtained in the vertical direction of well W202.

[0090] Based on the same inventive concept, this invention also provides a quantitative reconstruction device for ancient water depth. Since the principle of the problem solved by the above device is similar to that of the aforementioned quantitative reconstruction method for ancient water depth, the implementation of this device can refer to the implementation of the aforementioned method, and the repeated parts will not be described again.

[0091] This invention provides a quantitative reconstruction device for ancient water depth, referring to... Figure 6 As shown, it includes:

[0092] The first determining module 61 is used to determine the marker layer of the target well;

[0093] The calculation module 62 is used to calculate the relative paleowater depth of each logging segment in the target well based on the logging data of the target well.

[0094] The second determining module 63 is used to determine the absolute paleowater depth value of the marker layer based on the feature information in the marker layer;

[0095] The correction module 64 is used to correct the relative paleowater depth values ​​of each logging segment based on the relative paleowater depth values ​​of the marker segments included in the relative paleowater depth values ​​of each logging segment, and the absolute paleowater depth values ​​of the marker segments, so as to obtain the absolute paleowater depth values ​​of each logging segment.

[0096] This invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the aforementioned method for quantitatively reconstructing ancient water depth.

[0097] This invention provides a computer program product, which includes a computer program that, when executed by a processor, implements the aforementioned method for quantitatively reconstructing ancient water depth.

[0098] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0099] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0100] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations 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, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0101] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0102] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0103] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for quantitatively reconstructing ancient water depth, characterized in that, include: Identify the marker interval for the target well; Based on the logging data of the target well, determine the logging response characteristics of the marker interval in the target well; Based on the logging response characteristics of the marker interval in the target well and the logging response characteristics of each uncored well in the area where the target well is located, the marker interval of each uncored well is determined. Calculate the relative paleowater depth values ​​for each logging segment of each well for which no core was taken; Determine the absolute paleowater depth of the marker stratigraphic intervals for each of the uncored wells; Based on the relative paleowater depth values ​​of each logging segment of each unextracted core well, which include the relative paleowater depth values ​​of the marker segments of each unextracted core well, and the absolute paleowater depth values ​​of the marker segments of each unextracted core well, the relative paleowater depth values ​​of each logging segment of each unextracted core well are corrected to obtain the absolute paleowater depth values ​​of each logging segment of each unextracted core well. Based on the logging data of the target well, calculate the relative paleowater depth of each logging segment in the target well; Based on the core data from the target well and the fossil characteristics information in the marker layer, a query is performed in a pre-set Earth biodiversity database to determine the absolute paleowater depth of the marker layer. Based on the relative paleowater depth values ​​of each logging segment, the relative paleowater depth values ​​of the marker segment, and the absolute paleowater depth values ​​of the marker segment, the relative paleowater depth values ​​of each logging segment are corrected to obtain the absolute paleowater depth values ​​of each logging segment.

2. The method as described in claim 1, characterized in that, Based on the logging data of the target well, calculate the relative paleowater depth values ​​for each logging interval in the target well, including: Based on the U-values ​​of each logging node within the depth range of each logging segment recorded in the logging U-curve of the target well logging data, the relative paleowater depth of each logging segment in the target well is calculated according to the first calculation formula. The first calculation formula is: ； In the above formula, D represents the relative paleowater depth of each logging segment; n represents the number of logging nodes within the depth range of each logging segment; and i represents the order of the logging nodes within the depth range of each logging segment. This represents the U value of each logging node within the depth range of each logging segment.

3. The method as described in claim 2, characterized in that, The relative paleowater depth values ​​of each logging interval and the relative paleowater depth values ​​of the marker interval include: Based on the depth range of the marker layer, the relative paleowater depth of each logging layer and the relative paleowater depth of the marker layer are determined.

4. The method as described in claim 3, characterized in that, Based on the determined relative paleowater depth values ​​and absolute paleowater depth values ​​of the marker stratigraphic intervals, the relative paleowater depth values ​​of each logging interval are corrected to obtain the absolute paleowater depth values ​​of each logging interval, including: Based on the determined relative paleowater depth and absolute paleowater depth of the marker interval, the relative paleowater depth of each logging interval is corrected according to the second calculation formula to obtain the absolute paleowater depth of each logging interval. The second calculation formula is: ； In the above formula, H represents the absolute paleowater depth of each logging segment; D represents the relative paleowater depth of each logging segment. This represents the absolute paleowater depth of the marker layer; This indicates the relative paleowater depth of the marker layer.

5. The method as described in claim 1, characterized in that, Identify the marker intervals for the target well, including: Identify the Guanyinqiao Formation or the graptolite zone of the Longmaxi Formation in the target well.

6. A quantitative reconstruction device for ancient water depth, characterized in that, include: The first determining module is used to determine the marker interval of the target well; Based on the logging data of the target well, determine the logging response characteristics of the marker interval in the target well; Based on the logging response characteristics of the marker intervals in the target well and the logging response characteristics of each unextracted core well in the area where the target well is located, the marker intervals of each unextracted core well are determined; the relative paleowater depth values ​​of each logging interval of each unextracted core well are calculated; the absolute paleowater depth values ​​of each logging interval of each unextracted core well are determined; based on the relative paleowater depth values ​​of the marker intervals of each unextracted core well included in the relative paleowater depth values ​​of each logging interval of each unextracted core well, and the absolute paleowater depth values ​​of the marker intervals of each unextracted core well, the relative paleowater depth values ​​of each logging interval of each unextracted core well are corrected to obtain the absolute paleowater depth values ​​of each logging interval of each unextracted core well. The calculation module is used to calculate the relative paleowater depth of each logging segment in the target well based on the logging data of the target well. The second determining module is used to query a preset Earth biodiversity database based on the data from the core samples taken from the target well and the fossil characteristic information in the marker layer to determine the absolute paleowater depth of the marker layer. The correction module is used to correct the relative paleowater depth values ​​of each logging segment based on the relative paleowater depth values ​​of the marker segments included in the relative paleowater depth values ​​of each logging segment, and the absolute paleowater depth values ​​of the marker segments, so as to obtain the absolute paleowater depth values ​​of each logging segment.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the quantitative reconstruction method for paleowater depth as described in any one of claims 1 to 5.

8. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the quantitative reconstruction method for paleowater depth as described in any one of claims 1 to 5.

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