Marine carbonate high-resolution sequence stratigraphic division method and device
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- PETROCHINA CO LTD
- Filing Date
- 2021-12-31
- Publication Date
- 2026-06-05
Smart Images
Figure CN116413828B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of geological exploration technology, specifically to a method and apparatus for high-resolution sequence stratigraphy of marine carbonate rocks. Background Technology
[0002] Currently, methods for determining sequence boundaries mainly include: using unconformities or comparable conformable surfaces as sequence boundaries; using the maximum floodplain as sequence boundaries; using transgressive-regressive sedimentary sequences with unconformities or transgressive scour unconformities as boundaries; using base-level cycles and accommodation space and sediment supply for sequence delineation; and high-resolution sequence stratigraphy, exemplified by the Colorado TACross Genetic Stratigraphy Group. While these methods have yielded significant results in qualitative studies of terrestrial strata using high-resolution sequence stratigraphy, their application to marine carbonate strata is relatively weak. In particular, these methods do not specify how to use well logging and seismic techniques to delineate sequence boundaries and systems tracts in marine carbonate strata, nor have they established technical methods for identifying sequence boundaries, delineating systems tracts, and correlating marine carbonate sequences. Summary of the Invention
[0003] The purpose of this invention is to provide a method and apparatus for high-resolution sequence stratigraphy of marine carbonate rocks to solve the above-mentioned problems.
[0004] To achieve the above objectives, in a first aspect of the present invention, a method for high-resolution sequence stratigraphy of marine carbonate rocks is provided, comprising:
[0005] Obtain logging data for the target well section, and generate a first curve based on the logging data. The first curve is a curve used to characterize the fluctuation of the formation in the target well section relative to the paleosea level.
[0006] Acquire stable isotope data of the target well section, correct the first curve based on the stable isotope data, clarify the direction of fluctuation, and obtain the second curve;
[0007] Obtain the seismic profile of the target well section, determine the positive and negative inflection points of the second curve, and determine the sequence boundary of the target well section based on the negative inflection point of the second curve and the seismic profile.
[0008] The strong axis reflection characteristics of the seismic profile are obtained, and the sequence division of the target well section is determined based on the negative inflection point of the second curve, the strong axis reflection characteristics, and the sequence interface of the target well section.
[0009] Optionally, the logging data may be uranium-free gamma data, natural gamma data, and acoustic data.
[0010] Optionally, the stable isotope data is obtained based on carbon isotope analysis of the formation in the target well section, and is used to characterize the relative paleosea level rise and fall of the formation in the target well section.
[0011] Optionally, determining the sequence boundary of the target well section based on the negative inflection point of the second curve and the seismic profile includes:
[0012] The second curve is plotted on the seismic profile.
[0013] Determine the geological meaning of the peaks or troughs in the seismic profile:
[0014] Within a preset area of the seismic profile, if there is only one wave crest corresponding to one negative inflection point, then the wave crest is determined to be a sequence boundary; if there are multiple negative inflection points corresponding to different wave crests, then the wave crest corresponding to the negative inflection point with the greatest negative drift among the multiple negative inflection points is determined to be a sequence boundary; if there is a negative inflection point corresponding to a wave trough, then the wave crest closest to that negative inflection point is determined to be a sequence boundary.
[0015] Optionally, determining the sequence division of the target well section based on the negative inflection point of the second curve, the strong axis reflection characteristics, and the sequence boundary of the target well section includes:
[0016] Based on the acquired strong axis reflection characteristics, the strong axis type of the seismic profile is determined to be either a continuous strong axis or a discontinuous strong axis.
[0017] If a determined sequence boundary corresponds to a continuous strong axis, then the sequence boundary is determined to be a type I sequence boundary; if a determined sequence boundary corresponds to a discontinuous strong axis, then the sequence boundary is determined to be a type II sequence boundary.
[0018] Based on the identified sequence boundaries of different types, the strata of the target well section are sequence-divided to obtain the different types of sequences of the strata in the target well section.
[0019] Optionally, the method further includes:
[0020] Determine the positive inflection point of the second curve, where a positive inflection point of the second curve corresponds to a flooding surface of the target well section;
[0021] For each stratigraphic sequence of the same type on the seismic profile:
[0022] Among the positive inflection points on the second curve, the strong axis corresponding to the positive inflection point with the greatest positive drift is the maximum flood surface.
[0023] Optionally, the method further includes:
[0024] For each stratigraphic sequence of the same type on the seismic profile:
[0025] The strata above the sequence boundary up to the maximum flooding surface are defined as the transgressive systems tract, and the strata between the maximum flooding surface and the nearest overlying sequence boundary are defined as the highwater systems tract.
[0026] Optionally, the method further includes:
[0027] Determine the sequence division of all target well sections within the target area;
[0028] A high-resolution sequence stratigraphic framework for the target area was established by combining well and seismic data.
[0029] In a second aspect of the invention, a high-resolution sequence stratigraphy apparatus for marine carbonate rocks is provided, comprising:
[0030] The curve generation module is configured to acquire logging data of the target well section and generate a first curve based on the logging data. The first curve is a curve representing the rise and fall of the formation of the target well section relative to the paleosea level.
[0031] The curve correction module is configured to acquire stable isotope data of the target well section, correct the first curve based on the stable isotope data, clarify the direction of fluctuation, and obtain a second curve.
[0032] The sequence interface module is configured to acquire the seismic profile of the target well section, determine the negative inflection point of the second curve, and determine the sequence interface of the target well section based on the negative inflection point of the second curve and the seismic profile.
[0033] The sequence division module is configured to acquire the strong axis reflection characteristics of the seismic profile and determine the sequence division of the target well section based on the negative inflection point of the second curve, the strong axis reflection characteristics, and the sequence interface of the target well section.
[0034] In a third aspect of the invention, a machine-readable storage medium is provided, on which instructions are stored, which, when executed by a processor, cause the processor to be configured to perform the above-described high-resolution sequence stratigraphy method for marine carbonate rocks.
[0035] This invention utilizes a limited amount of geochemical data, combined with well logging and seismic data, to achieve sequence boundary identification, type classification, and flooding surface identification in drilling. It further divides the system domains to solve the problem of sequence identification and classification of target strata under conditions where core samples are unavailable or scarce. This invention can quickly, conveniently, and economically solve the problem of high-resolution sequence stratigraphy classification.
[0036] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description
[0037] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:
[0038] Figure 1 This is a flowchart of a high-resolution sequence stratigraphy method for marine carbonate rocks provided in a preferred embodiment of the present invention.
[0039] Figure 2 This is a comprehensive columnar section of the MX8 well provided in a preferred embodiment of the present invention;
[0040] Figure 3 This is the corrected composite columnar section of the MX8 well provided in a preferred embodiment of the present invention;
[0041] Figure 4 This is a schematic diagram of the seismic profile, maximum flooding surface, and systems tract division of well MX8 provided in a preferred embodiment of the present invention;
[0042] Figure 5 This is a schematic diagram of a regional high-resolution sequence lattice provided in a preferred embodiment of the present invention;
[0043] Figure 6 This is a schematic block diagram of a high-resolution sequence stratigraphy device for marine carbonate rocks provided in a preferred embodiment of the present invention. Detailed Implementation
[0044] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0045] like Figure 1 As shown, in a first aspect of this embodiment, a high-resolution sequence stratigraphy method for marine carbonate rocks is provided, comprising:
[0046] S100. Obtain logging data for the target well section and generate a first curve based on the logging data. The first curve is used to characterize the fluctuation of the formation relative to the paleosea level in the target well section.
[0047] S200. Obtain stable isotope data for the target well section, correct the first curve based on the stable isotope data, clarify the direction of fluctuation, and obtain the second curve.
[0048] S300. Obtain the seismic profile of the target well section, determine the negative inflection point of the second curve, and determine the sequence boundary of the target well section based on the negative inflection point of the second curve and the seismic profile.
[0049] S400: Obtain the strong axis reflection characteristics of the seismic profile, and determine the sequence division of the target well section based on the negative inflection point of the second curve, the strong axis reflection characteristics, and the sequence interface of the target well section.
[0050] Thus, this invention utilizes a small amount of geochemical data, combined with well logging and seismic data, to achieve sequence boundary identification, type classification, and flooding surface identification in drilling, and further divides the system domains to solve the problem of sequence identification and classification of target strata under conditions where there is no core or a lack of core samples. It can quickly, conveniently, and economically solve the problem of high-resolution sequence stratigraphy classification.
[0051] Since this embodiment focuses on the sequence stratigraphy of marine carbonate rocks, it is necessary to select a curve sensitive to carbonate lithology to calculate the change curve relative to paleosea level. In step S100, the logging data is the logging data of the target well section. In this embodiment, the logging data is uranium-free gamma ray (KTH) data or natural gamma ray (GR) data, or it can be sonic logging data. It is understood that in the relative paleosea level rise / fall curve, a positive value indicates above sea level, and a negative value indicates below sea level.
[0052] The formula for calculating the first curve is as follows:
[0053] μ = Σx(i) / N;
[0054] y(N) = x(i) - μ;
[0055] y(i) = [x(i) - μ] + y(i+1);
[0056] Where x refers to the thickness of each sublayer, N is the number of sublayers, μ represents the arithmetic mean of the thickness of each sublayer, y(N) represents the difference between each sublayer and μ, and y(i) represents the reverse iteration of the difference between each sublayer.
[0057] In step S200, stable isotope data is obtained based on carbon isotope analysis of the strata in the target well section, used to characterize the rise and fall of the strata in the target well section relative to paleosea level. This embodiment utilizes rock cuttings from the target well section for stable carbon isotope analysis, further correcting the first curve generated in step S100 so that the two curves show consistent trends within the same target section. For example, the two curves should show consistent trends within the same depth range, thereby determining the positive and negative directions relative to paleosea level. The rock cuttings data thickness should be no less than 10m, and the more data, the better. It is understood that carbon isotope analysis can determine the positive and negative directions of different target sections relative to sea level.
[0058] In step S300, determining the negative inflection point of the second curve includes: identifying points on the second curve where the formation relative to the paleosea level changes from negative to positive as negative inflection points, and points where the formation relative to the paleosea level changes from positive to negative as positive inflection points. The second curve is a curve representing the rise and fall relative to the paleosea level after carbon isotope analysis correction. All points on the second curve where the formation relative to the paleosea level changes from negative to positive are identified as negative inflection points. These negative inflection points represent the minimum value of the transition from negative to positive drift on the second curve. The identified negative inflection points may correspond to one of the peaks, troughs, or critical points on the seismic profile. As can be understood, as shown in the attached figure, the second curve is negative to the left of the baseline and positive to the right. The baseline represents the paleosea level, negative drift indicates a value below the paleosea level, and positive drift indicates a value above the paleosea level. The degree of negative or positive drift represents the value below or above the paleosea level, respectively.
[0059] The sequence boundary of the target well section is determined based on the negative inflection point of the second curve and the seismic profile, including:
[0060] Plot the second curve on the seismic profile;
[0061] Determine the geological meaning of the peaks or troughs in a seismic profile:
[0062] For any predefined region on a seismic profile, if a negative inflection point on the second curve corresponds to only one peak, then that peak is determined to be a sequence boundary. If multiple negative inflection points exist on the second curve, then the peak corresponding to the negative inflection point with the greatest negative drift is determined to be the sequence boundary. If a negative inflection point corresponds to a trough, then the peak closest to that negative inflection point is determined to be the sequence boundary. Understandably, the value of a point on the second curve can be the distance of that point relative to the paleosea level. The predefined region can be divided based on the distance between multiple peaks. For example, if several consecutive peaks on the seismic profile are close together, such as 30 meters or 50 meters, then these peaks are assigned to the same predefined region. The specific division criteria can be determined empirically and are not limited here.
[0063] In step S400, the sequence division of the target well section is determined based on the negative inflection point of the second curve, strong axis reflection characteristics, and the sequence boundary of the target well section, including:
[0064] S410. Based on the acquired strong axis reflection characteristics, determine whether the strong axis type of the seismic profile is a continuous strong axis or a discontinuous strong axis. It can be understood that the strong axis reflection characteristics of the seismic profile can determine whether the strong axis on the seismic profile is a continuous strong axis or a discontinuous strong axis. Therefore, in this embodiment, before determining the type of sequence boundary, first determine which in-phase axes on the seismic profile are continuous strong axes and which are discontinuous strong axes based on the strong axis reflection characteristics. In this embodiment, strong axes with a continuity greater than 10 km are determined as continuous strong axes, and strong axes with a continuity less than 10 km are determined as discontinuous strong axes.
[0065] S420. If a determined sequence boundary corresponds to a continuous strong axis, then the sequence boundary is determined to be a Type I sequence boundary; if a determined sequence boundary corresponds to a discontinuous strong axis, then the sequence boundary is determined to be a Type II sequence boundary. Type I sequence boundaries are the boundaries of first-order sequences, and Type II sequence boundaries are the boundaries of second-order sequences. Sequences developing below Type I sequence boundaries may be second-order or lower-order sequences, and the corresponding sequences below Type II sequence boundaries may be third-order or lower-order sequences, and so on. It can be understood that the level of a sequence boundary is directly proportional to the degree of negative drift at the negative inflection point of the second curve; the greater the degree of negative drift at the negative inflection point, the higher the level of the sequence boundary. The correspondence between the degree of negative drift at the negative inflection point and the level of the sequence boundary can be determined empirically and is not limited here.
[0066] S430. Based on the identified different types of sequence boundaries, the strata in the target well section are sequence-divided to obtain different types of sequences in the target well section. For example, the strata between two adjacent Type I sequence boundaries are identified as a first-order sequence, the strata between two adjacent Type II sequence boundaries are identified as a second-order sequence, and so on.
[0067] To further subdivide the systems tracts of the strata, after determining the type of sequence boundary, the method of this embodiment further includes:
[0068] S500, For each layer sequence of the same type on the seismic profile:
[0069] In this sequence, among all the positive inflection points of the second curve, the strong axis corresponding to the positive inflection point with the greatest positive drift is determined to be the maximum floodplain.
[0070] In this sequence, the strata above the sequence boundary to the maximum flood level are identified as the transgressive systems tract, and the strata between the maximum flood level and the overlying sequence boundary are identified as the highwater systems tract.
[0071] Understandably, a first-order sequence may contain multiple second-order sequences, and each second-order sequence may contain multiple third-order sequences. For a first-order sequence, the division of the system domain is based on the maximum floodplain within the first-order sequence. This maximum floodplain is also the floodplain corresponding to the strong axis of the positive inflection point with the greatest positive drift among all positive inflection points in the second curve. For a second-order sequence, the maximum floodplain of one second-order sequence is necessarily the same as the maximum floodplain of the first-order sequence, while the maximum floodplains of other second-order sequences are the floodplains corresponding to the positive inflection point with the relatively greatest positive drift in the second curve of their respective sequences. Similarly, for a third-order sequence, the maximum floodplain of one third-order sequence is necessarily the same as the maximum floodplain of the first-order sequence, while the maximum floodplains of other third-order sequences are the floodplains corresponding to the positive inflection point with the relatively greatest positive drift in the second curve of their respective sequences, and so on.
[0072] In this embodiment, the method further includes:
[0073] S600, Determine the sequence division of all target well sections within the target area;
[0074] S700. By combining well and seismic data, a high-resolution sequence stratigraphic framework for the target area is established. The following uses the Dengying Formation of Well MX8 in the Sichuan Basin as an example to further illustrate this invention.
[0075] First step, such as Figure 2 As shown, the variation curves of each stratum relative to the paleosea level in the Dengying Formation of Well MX8 are established based on the uranium-free gamma curve (KTH) in the well logging data.
[0076] The second step, as Figure 3 As shown, the positive and negative directions of the relative paleosea level change curve are further corrected using stable carbon isotopes measured from rock cuttings in the target well section.
[0077] The third step is to combine well and seismic analysis to determine the location of the sequence boundary.
[0078] The fourth step is to determine the sequence interface type. If the negative inflection point corresponds to a continuous strong axis, it is a type I sequence interface; if it corresponds to a discontinuous strong axis, it is a type II sequence interface. Sequences developing below a type I sequence interface may be second-order or lower-order sequences, but sequences below a type II sequence interface may be third-order or lower-order sequences.
[0079] Step 5: Determine the location of the maximum flooding surface; combining the large paleogeographic background, cut through the well profile in the direction of the vertical facies zone, and mark the curve of the change of the relative paleosea level on the seismic profile. The strong axis corresponding to the maximum positive drift point is the maximum flooding surface.
[0080] Step 6: System domain division; such as Figure 4As shown, in two adjacent sequence boundaries, the position from the sequence boundary upwards to the floodplain is the transgressive systems tract (TST); the position from the floodplain to the overlying sequence boundary is the highwater systems tract (HST).
[0081] Step 7: Establishment of a high-resolution hierarchical lattice model; such as Figure 5 As shown, based on single-well sequence stratigraphy and combined with seismic sequence stratigraphy, a regional three-level sequence stratigraphy framework division and correlation scheme is finally established. Within the three-level sequence stratigraphy framework, four-level or five-level sequences can be further divided, ultimately establishing a regional high-resolution sequence stratigraphy framework.
[0082] like Figure 6 As shown, in a second aspect of the present invention, a high-resolution sequence stratigraphy apparatus for marine carbonate rocks is provided, comprising:
[0083] The curve generation module is configured to acquire logging data of the target well section and generate a first curve based on the logging data. The first curve is used to characterize the rise and fall of the formation relative to the paleosea level of the target well section.
[0084] The curve correction module is configured to acquire stable isotope data of the target well section, correct the first curve based on the stable isotope data, clarify the direction of fluctuation, and obtain the second curve.
[0085] The sequence interface module is configured to acquire the seismic profile of the target well section, determine the negative inflection point of the second curve, and determine the sequence interface of the target well section based on the negative inflection point of the second curve and the seismic profile.
[0086] The sequence division module is configured to acquire the strong axis reflection characteristics of the seismic profile and determine the sequence division of the target well section based on the negative inflection point of the second curve, the strong axis reflection characteristics, and the sequence interface of the target well section.
[0087] In a third aspect of the invention, a machine-readable storage medium is provided, on which instructions are stored, which, when executed by a processor, cause the processor to be configured to perform the above-described high-resolution sequence stratigraphy method for marine carbonate rocks.
[0088] Machine-readable storage media include both permanent and non-permanent, removable and non-removable media, which can store information by any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.
[0089] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. 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... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.
[0090] 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.
[0091] 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.
[0092] It should also be noted that 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 process, method, article, or apparatus. Unless otherwise specified, an element defined 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.
[0093] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.
[0094] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not describe the various possible combinations separately.
[0095] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the embodiments of the present invention, and should also be regarded as the content disclosed by the embodiments of the present invention.
Claims
1. A high-resolution sequence stratigraphy method for marine carbonate rocks, characterized in that, include: Obtain logging data for the target well section, and generate a first curve based on the logging data. The first curve is a curve used to characterize the fluctuation of the formation in the target well section relative to the paleosea level. Acquire stable isotope data of the target well section, correct the first curve based on the stable isotope data, clarify the direction of fluctuation, and obtain the second curve; Obtain the seismic profile of the target well section, determine the negative inflection point of the second curve, and determine the sequence boundary of the target well section based on the negative inflection point of the second curve and the seismic profile. The strong axis reflection characteristics of the seismic profile are obtained, and the sequence division of the target well section is determined based on the negative inflection point of the second curve, the strong axis reflection characteristics, and the sequence interface of the target well section.
2. The high-resolution sequence stratigraphy method for marine carbonate rocks according to claim 1, characterized in that, The logging data is uranium-free gamma data, natural gamma data, or acoustic data.
3. The high-resolution sequence stratigraphy method for marine carbonate rocks according to claim 2, characterized in that, The stable isotope data are obtained based on carbon isotope analysis of the formation in the target well section and are used to characterize the relative rise and fall of the formation in the target well section relative to the paleosea level.
4. The high-resolution sequence stratigraphy method for marine carbonate rocks according to claim 1, characterized in that, Determining the sequence boundary of the target well section based on the negative inflection point of the second curve and the seismic profile includes: The second curve is plotted on the seismic profile. Determine the geological meaning of the peaks or troughs in the seismic profile: Within a preset area of the seismic profile, if there is only one wave crest corresponding to one negative inflection point, then the wave crest is determined to be a sequence boundary; if there are multiple negative inflection points corresponding to different wave crests, then the wave crest corresponding to the negative inflection point with the greatest negative drift among the multiple negative inflection points is determined to be a sequence boundary; if there is a negative inflection point corresponding to a wave trough, then the wave crest closest to that negative inflection point is determined to be a sequence boundary.
5. The high-resolution sequence stratigraphy method for marine carbonate rocks according to claim 4, characterized in that, The sequence division of the target well section is determined based on the negative inflection point of the second curve, the strong axis reflection characteristics, and the sequence boundary of the target well section, including: Based on the acquired strong axis reflection characteristics, the strong axis type of the seismic profile is determined to be either a continuous strong axis or a discontinuous strong axis. If a determined sequence boundary corresponds to a continuous strong axis, then the sequence boundary is determined to be a type I sequence boundary; if a determined sequence boundary corresponds to a discontinuous strong axis, then the sequence boundary is determined to be a type II sequence boundary. Based on the identified sequence boundaries of different types, the strata of the target well section are sequence-divided to obtain the different types of sequences of the strata in the target well section.
6. The high-resolution sequence stratigraphy method for marine carbonate rocks according to claim 5, characterized in that, The method further includes: Determine the positive inflection point of the second curve, where a positive inflection point of the second curve corresponds to a flooding surface of the target well section; For each stratigraphic sequence of the same type on the seismic profile: Among the positive inflection points of the second curve, the strong axis corresponding to the positive inflection point with the greatest positive drift is the maximum flood surface.
7. The high-resolution sequence stratigraphy method for marine carbonate rocks according to claim 6, characterized in that, The method further includes: For each stratigraphic sequence of the same type on the seismic profile: The strata above the sequence boundary up to the maximum flooding surface are defined as the transgressive systems tract, and the strata between the maximum flooding surface and the overlying adjacent sequence boundary are defined as the highwater systems tract.
8. The high-resolution sequence stratigraphy method for marine carbonate rocks according to claim 5, characterized in that, The method further includes: Determine the sequence division of all target well sections within the target area; A high-resolution sequence stratigraphic framework for the target area was established by combining well and seismic data.
9. A high-resolution sequence stratigraphy device for marine carbonate rocks, characterized in that, include: The curve generation module is configured to acquire logging data of the target well section and generate a first curve based on the logging data. The first curve is a curve used to characterize the fluctuation of the formation of the target well section relative to the paleosea level. The curve correction module is configured to acquire stable isotope data of the target well section, correct the first curve based on the stable isotope data, clarify the direction of fluctuation, and obtain a second curve. The sequence interface module is configured to acquire the seismic profile of the target well section, determine the negative inflection point of the second curve, and determine the sequence interface of the target well section based on the negative inflection point of the second curve and the seismic profile. The sequence division module is configured to acquire the strong axis reflection characteristics of the seismic profile and determine the sequence division of the target well section based on the negative inflection point of the second curve, the strong axis reflection characteristics, and the sequence interface of the target well section.
10. A machine-readable storage medium storing instructions thereon, characterized in that, When executed by a processor, this instruction causes the processor to be configured to perform the high-resolution sequence stratigraphy method for marine carbonate rocks as described in any one of claims 1 to 8.