A method for identifying a clastic bank based on a reflection configuration

Abstract

The application discloses a method for identifying bioclastic shoal based on reflection configuration, comprising the following steps: S1, in combination with regional sedimentary background, using seismic facies and seismic attributes capable of representing bioclastic shoal deposition to determine a favorable facies zone of bioclastic shoal development; S2, through well-seismic calibration, dividing the development stages of bioclastic shoal, combining with forward simulation results to implement seismic response characteristics and influencing factors of different stages of bioclastic shoal, and establishing a bioclastic shoal identification mode; S3, through full three-dimensional automatic scanning interpretation technology, establishing a bioclastic shoal high-frequency sequence stratigraphic framework, and determining reflection structure and superimposed characteristics of different stages of bioclastic shoal; S4, using the top and bottom horizons of different stages of bioclastic shoal scanned automatically to perform isochronous stratigraphic slice analysis, and analyzing the plane distribution law of different stages of bioclastic shoal; and S5, through operation of the top and bottom horizons of different stages of bioclastic shoal, the development main body and reflection structure characteristics of different stages of bioclastic shoal are obtained, and fast identification of multi-stage superimposed bioclastic shoal is realized.

Description

Technical Field

[0001] This invention relates to the field of reservoir prediction in oil and gas exploration and development, and in particular to a method for identifying bioclastic shoals based on reflection configuration. Background Technology

[0002] Globally proven carbonate oil and gas reserves are mainly distributed along platform margins (56.2%, bioherm shoals) and within platforms (35%, intraplatform reefs, shoals, and intraplatform dolomite). Several bioherm shoal gas reservoirs have been discovered along the Kaijiang-Liangping Trough in northeastern Sichuan Basin, including Puguang, Longgang, Huanglongchang, and Yuanba. Carbonate reef shoal gas reservoirs have been a crucial exploration area for increasing reserves and production in recent years. These discoveries indicate that carbonate reef shoal reservoirs have excellent exploration potential. Recent oil and gas discoveries in the Maokou Formation of northeastern Sichuan within bioherm shoal dolomite reservoirs on gentle slopes of carbonate rocks suggest promising exploration prospects for intraplatform shoal reservoirs on gentle slopes of carbonate rocks.

[0003] However, current research mainly focuses on identifying thick bioherms and shoals at the edge of platforms, analyzing the superposition relationship and planar distribution of bioherm and shoal complexes through various means. However, bioclastic shoals are highly heterogeneous, and conventional seismic techniques and methods are difficult to accurately identify the internal reflection structure and planar distribution of bioclastic shoals, which restricts the study of bioclastic shoal reservoirs. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by providing a bioclastic beach identification method based on reflection configuration. By finely characterizing the internal structure of the bioclastic beach, the stratification structure and distribution of different bioclastic beaches are determined, enabling effective identification of superimposed bioclastic beaches.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A method for identifying bioclastic beaches based on reflection configuration includes the following steps:

[0007] Step S1: Combine the regional sedimentary background and use seismic facies and seismic properties that can characterize bioclastic shoal deposits to determine the favorable facies zones for bioclastic shoal development;

[0008] The regional sedimentary background is the development background of carbonate bioclastic shoals confirmed by surface outcrops, drilling, logging, and seismic data; the seismic facies is the sum of the bioclastic shoals' appearance on seismic profiles, including changes in the external reflection morphology and internal reflection structure of the bioclastic shoals caused by the lithological combination of the bioclastic shoals and surrounding rocks, bedding development, and sedimentation; the seismic attributes are the amplitude, frequency, phase, and comprehensive calculation results of various seismic attributes reflecting the bioclastic shoal deposition; the favorable facies zones for the development of the bioclastic shoals are determined comprehensively based on the regional sedimentary background, seismic facies, and seismic attributes.

[0009] Step S2: divide the development stages of the bioclastic shoal by drilling-seismic calibration, and determine the seismic response characteristics and influencing factors of different stages of the bioclastic shoal according to the forward simulation results, to establish a bioclastic shoal identification mode;

[0010] The development stages of the bioclastic shoal are first determined by using drilling lithology, cuttings, and logging curve characteristics to determine the lithological combination relationship of the bioclastic shoal and the shoal, and then the seismic response characteristics of different stages of the bioclastic shoal are determined by using seismic synthetic record calibration; the bioclastic shoal geological model can be established according to the known well, including different thicknesses, different frequencies, different stacking relationships, different velocities, different densities, different development positions, etc., and can accurately reflect the internal structure and bedding characteristics of the bioclastic shoal deposition; the bioclastic shoal seismic identification mode is established by combining the forward simulation record of the bioclastic shoal geological model and the actual seismic profile reflection characteristics;

[0011] Step S3: establish a bioclastic shoal high-frequency sequence stratigraphic framework by using a full three-dimensional automatic scanning interpretation technology, and determine the reflection structure and stacking characteristics of different stages of the bioclastic shoal;

[0012] The full three-dimensional automatic scanning interpretation technology is guided by seismic sedimentology, spatially deconstructs the seismic data body, decomposes multiple data nodes, quickly realizes the optimal connection between adjacent two data nodes by combining automatic and manual methods, and finally obtains a high-precision bioclastic shoal high-frequency sequence stratigraphic framework; different stages of the bioclastic shoal reflection structure are quickly determined from the high-frequency sequence stratigraphic framework by combining drilling, logging, and seismic synthetic record calibration, so that multiple thick bioclastic shoal development positions are efficiently and quickly interpreted automatically, and the sedimentation, migration, and stacking relationship is clear;

[0013] Step S4: analyze the planar distribution law of different stages of the bioclastic shoal by using the top and bottom horizons of different stages of the bioclastic shoal scanned automatically for isochronal stratigraphic slice analysis;

[0014] The top and bottom horizons of different stages of the bioclastic shoal scanned automatically are extracted from the bioclastic shoal high-frequency sequence stratigraphic framework according to the bioclastic shoal seismic calibration results, without manual interpretation of the horizons, and the accuracy and efficiency of the automatic scanning interpretation results are obviously improved; the isochronal stratigraphic slice can reflect the isochronality of the deposition of different stages of the bioclastic shoal, and the planar analysis results can truly reflect the planar distribution of different stages of the bioclastic shoal;

[0015] Step S5: obtain the development main body and reflection structure characteristics of different stages of the bioclastic shoal by operating the top and bottom horizons of different stages of the bioclastic shoal, to realize the rapid identification of multiple stacked bioclastic shoals;

[0016] The development main body of the bioclastic shoal can be obtained by operating the top and bottom horizons of different stages of the bioclastic shoal; the planar prediction results and the seismic profile of the bioclastic shoal development position are combined to dynamically, quickly, and intuitively display the spatial distribution of multiple stacked bioclastic shoals.

[0017] The present application is guided by the theory of sequence stratigraphy and seismic sedimentology, and is based on basic geology, drilling, seismic and logging data, takes the development of favorable facies of bioclastic shoal as the main line, takes the bioclastic shoal identification mode and full three-dimensional automatic scanning interpretation technology as the key, and finely depicts the internal reflection structure and planar distribution characteristics of different period bioclastic shoals. The present application firstly combines geology and seismic to determine the development of favorable facies of bioclastic shoal, uses drilling and seismic calibration to determine the development period of bioclastic shoal, implements the seismic response characteristics and influencing factors of different period bioclastic shoal, establishes the bioclastic shoal identification mode, establishes the high-frequency sequence stratigraphic framework through full three-dimensional automatic scanning interpretation technology, finely depicts the internal reflection structure of different period bioclastic shoal, uses the isochronous stratigraphic slice to analyze the planar distribution of different period bioclastic shoal, and finally realizes the fine depiction and identification of multi-layer superimposed bioclastic shoal.

[0018] As a preferred scheme of the present application, in the step S1, the determination of the development of favorable facies of bioclastic shoal comprises the following steps:

[0019] Step S11: Based on the regional sedimentary background, the development position and seismic reflection characteristics of bioclastic shoal on the seismic profile are determined according to drilling and seismic synthetic record calibration;

[0020] Step S12: According to the seismic reflection characteristics, the amplitude, phase or related statistical seismic attributes are selected for bioclastic shoal planar prediction in a fixed time window;

[0021] Step S13: The development of favorable facies of bioclastic shoal is further refined by using seismic waveform classification attributes;

[0022] Step S14: The development of favorable facies of bioclastic shoal is determined by comprehensively using multiple seismic attributes.

[0023] As a preferred scheme of the present application, in the step S2, the establishment of the bioclastic shoal identification mode comprises the following steps:

[0024] Step S21: Drilling core, cuttings, logging data and seismic data are used for fine calibration of bioclastic shoal, and the actual lithology, lithofacies combination is used to divide the bioclastic shoal period, and the seismic response characteristics of each period bioclastic shoal are determined;

[0025] Step S22: According to the actual seismic profile reflection structure characteristics, the bioclastic shoal forward modeling of different thickness, different frequency, different stacking relationship, different velocity, different density, different development position is established, forward modeling research is carried out, and the influencing factors affecting the reflection characteristics of different period bioclastic shoal are analyzed;

[0026] Step S23: The seismic reflection structure and lateral distribution characteristics of each period bioclastic shoal are determined by further improving the resolution of seismic data;

[0027] Step S24: comprehensive drilling-seismic calibration, forward modeling results, and establishment of the identification mode of the bioclastic bank.

[0028] As a preferred scheme of the present application, in the step S3, the determination of the reflection structure and superimposition characteristics of the bioclastic banks of different periods comprises the following steps:

[0029] Step S31: guided by seismic sedimentology, a three-dimensional data body space grid node model is established by means of the optimal connection mode of seismic data similarity and geological consistency, full three-dimensional bioclastic bank automatic scanning interpretation is performed, and the bioclastic bank high-frequency sequence stratigraphic framework is calculated.

[0030] Step S32: combined with the drilling calibration results of the bioclastic banks of different periods, the bioclastic bank high-frequency sequence stratigraphic framework and the seismic profile, the seismic reflection structure, sedimentation, migration and superimposition characteristics of each period of the bioclastic bank are comprehensively analyzed.

[0031] As a preferred scheme of the present application, in the step S4, the analysis of the planar distribution law of the bioclastic banks of different periods comprises the following steps:

[0032] Step S41: the target layer position is extracted from the multiple layers automatically tracked from the bioclastic bank sequence stratigraphic framework for geological interpretation, and the top and bottom positions of the bioclastic banks of different periods are determined according to the drilling calibration results;

[0033] Step S42: isochronous stratigraphic slice analysis is performed on the bioclastic bank layers automatically tracked to determine the planar distribution of the bioclastic banks of different periods.

[0034] As a preferred scheme of the present application, in the step S5, the obtaining of the development main body and reflection structure characteristics of the bioclastic banks of different periods comprises the following steps:

[0035] Step S51: the development main body position of each period of the bioclastic bank is obtained according to the top and bottom position calculation of the bioclastic bank;

[0036] Step S52: the reflection structure characteristics of the main body of the different bioclastic banks are determined by dynamically browsing the planar attribute and the seismic profile.

[0037] As described above, due to the adoption of the above technical scheme, the present application has the following beneficial effects:

[0038] 1. For the bioclastic bank, the development periods of the bioclastic bank are divided by well-seismic combination, the resolution of the seismic data is further improved, and the seismic reflection characteristics and horizontal distribution of the bioclastic banks of different periods are implemented.

[0039] 2. The bioclastic bank model is established, and the influencing factors of the reflection characteristics of the bioclastic banks of different periods are analyzed by forward modeling.

[0040] 3. Using full three-dimensional automatic scanning interpretation technology, a high-frequency sequence stratigraphic framework of the bioclastic shoal is established, and reflection structures and superimposition characteristics of bioclastic shoals of different periods are determined.

[0041] 4. On the basis of the high-frequency sequence stratigraphic framework of the bioclastic shoal, isochronal stratigraphic slice attribute analysis of bioclastic shoals of different periods is carried out, and the planar distribution of different bioclastic shoal main bodies is determined.

[0042] 5. The bioclastic shoal has good application effect and popularization prospect, and can be widely applied to the field of fine depiction of oil and gas exploration and development targets. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is a flowchart of the present application.

[0044] Figure 2 is a well-seismic correlation diagram of the research area.

[0045] Figure 3 is a favorable facies belt map of the bioclastic shoal in the research area.

[0046] Figure 4 is a waveform profile diagram of the seismic response characteristics of the bioclastic shoal in the research area.

[0047] Figure 5 is a phase profile diagram of the seismic response characteristics of the bioclastic shoal in the research area.

[0048] Figure 6 is a fine anatomical diagram of the bioclastic shoal structure in the research area.

[0049] Figure 7 is a bioclastic shoal main body distribution map of the first period shoal in the research area.

[0050] Figure 8 is a bioclastic shoal main body distribution map of the second period shoal in the research area.

[0051] Figure 9 is a bioclastic shoal main body distribution map of the third period shoal in the research area. DETAILED DESCRIPTION

[0052] The present application will be described in detail below with reference to the accompanying drawings.

[0053] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0054] Example 1

[0055] In a certain research area of an oilfield in the northeast of Sichuan Basin, the bioclastic shoal of carbonate ramp belt is widely developed, the thickness is thin, and multiple layers are superimposed, so that the internal structure is difficult to finely depict, which has become an important problem faced by exploration and development production, and the identification of the bioclastic shoal based on the reflection configuration is taken as an example to further illustrate the technical scheme of the application.

[0056] The embodiment provides a bioclastic shoal identification method based on a reflection configuration, which comprises the following steps, as shown in the figure: Figure 1

[0057] Step S1: in combination with a regional sedimentary background, using a seismic facies and a seismic attribute capable of representing bioclastic shoal deposition to determine a favorable facies belt of bioclastic shoal development;

[0058] The regional sedimentary background is a bioclastic shoal development background verified by surface outcrops, drilling, logging and seismic data and the like; the seismic facies is the sum of the manifestations of the bioclastic shoal on the seismic profile, the external reflection form, the internal reflection structure change and the like caused by the lithologic combination of the bioclastic shoal and surrounding rock, the developed bedding and deposition and the like; the seismic attribute is the amplitude, frequency, phase and comprehensive operation result of multiple seismic attributes and the like reflecting the deposition of the bioclastic shoal; and the favorable facies belt of bioclastic shoal development is determined according to the results of the three of the regional sedimentary background, the seismic facies and the seismic attribute.

[0059] The determination of the favorable facies belt of bioclastic shoal development comprises the following steps:

[0060] Step S11: on the basis of the regional sedimentary background, the development position and the seismic reflection characteristics of the bioclastic shoal on the seismic profile are determined according to the drilling and the seismic synthetic record calibration, and the well-seismic correlation diagram is as shown in the figure: Figure 2

[0061] Step S12: according to the seismic reflection characteristics, the amplitude, the phase or the related statistical seismic attribute is selected to perform the bioclastic shoal plane prediction in a fixed time window;

[0062] Step S13: the favorable facies belt of bioclastic shoal development is further refined by using the seismic waveform classification attribute;

[0063] Step S14: the favorable facies belt of bioclastic shoal development is determined by multiple seismic attributes, as shown in the figure: Figure 3

[0064] Step S2: through the drilling-seismic calibration, the development stages of the bioclastic shoal are divided, the seismic response characteristics and the influencing factors of the bioclastic shoal of different stages are implemented in combination with the forward simulation result, and a bioclastic shoal identification mode is established;

[0065] ​​​The development period of the bioclastic beach is first determined by using drilling lithology, cuttings, logging curve characteristics and the like to determine the lithological combination relationship of the bioclastic beach and the beach, and then the seismic response characteristics of different period bioclastic beaches are determined by using seismic synthetic record calibration; the bioclastic beach geological model can be established according to the known well, including different thickness, different frequency, different superimposed relationship, different velocity, different density, different development position and the like, and can accurately reflect the internal structure and bedding characteristics of the bioclastic beach deposition and the like; the bioclastic beach seismic identification mode is established by combining the forward modeling record of the bioclastic beach geological model and the actual seismic section reflection characteristics.

[0066] The establishment of the bioclastic beach identification mode includes the following steps:

[0067] Step S21: The bioclastic beach is finely calibrated by using drilling core, cutting, logging data and seismic data, the actual lithology and lithofacies combination are divided to divide the bioclastic beach period, and the seismic response characteristics of each period bioclastic beach are determined, such as Figure 4 Figure 5 as shown in the figure;

[0068] Step S22: According to the actual seismic section reflection structure characteristics, the bioclastic beach forward model of different thickness, different frequency, different superimposed relationship, different velocity, different density and different development position is established, the forward modeling research is carried out, and the influencing factors affecting the reflection characteristics of different period bioclastic beach are analyzed;

[0069] Step S23: The conventional seismic data cannot identify the bioclastic beach smaller than one quarter wavelength, the resolution of the seismic data is further improved, and the seismic reflection structure and lateral distribution characteristics of each period bioclastic beach are determined;

[0070] Step S24: The bioclastic beach identification mode is established by comprehensively considering the drilling-seismic calibration and the forward modeling result.

[0071] Step S3: The bioclastic beach high-frequency sequence stratigraphic framework is established by the full three-dimensional automatic scanning interpretation technology, and the reflection structure and superimposed characteristics of different period bioclastic beach are determined;

[0072] The full three-dimensional automatic scanning interpretation technology is guided by seismic sedimentology, and the spatial deconstruction of the seismic data body is carried out, a plurality of data nodes are decomposed, the optimal connection between the adjacent two data nodes is quickly realized by combining automatic and manual methods, and finally the high-precision bioclastic beach high-frequency sequence stratigraphic framework is obtained. The reflection structure of different period bioclastic beach is quickly determined from the high-frequency sequence stratigraphic framework by combining drilling, logging and seismic synthetic record calibration, so that a plurality of thick bioclastic beach development positions are efficiently and quickly interpreted automatically, and the sedimentation, migration and superimposed relationship thereof is clear. The full three-dimensional automatic scanning interpretation technology has been applied to some commercial software, such as paleoscan.

[0073] The determining of the different-period bioclastic shoal reflection structures and superimposed features comprises the following steps:

[0074] Step S31: guided by seismic sedimentology, a three-dimensional data body space grid node model is established through seismic data similarity and geology consistency optimal connection mode, full three-dimensional bioclastic shoal automatic scanning interpretation is performed, and a bioclastic shoal high-frequency sequence stratigraphic framework is calculated, as shown in the following figure: Figure 6

[0075] Step S32: combined with the different-period bioclastic shoal drilling calibration results, the bioclastic shoal high-frequency sequence stratigraphic framework and the seismic profile, the seismic reflection structure, the sedimentation, the migration and the superimposed features of each period bioclastic shoal are comprehensively analyzed.

[0076] Step S4: isochronous stratigraphic slice analysis is performed on the different-period bioclastic shoal top and bottom horizons scanned automatically, and the plane distribution law of the different-period bioclastic shoal is analyzed.

[0077] The different-period bioclastic shoal top and bottom horizons scanned automatically are extracted from the bioclastic shoal high-frequency sequence stratigraphic framework according to the bioclastic shoal seismic calibration results, without manual interpretation of horizons, and the accuracy and efficiency of the automatic scanning interpretation result are obviously improved; the isochronous stratigraphic slice can reflect the isochronism of the sedimentation of the different-period bioclastic shoal, and the plane analysis result can truly reflect the plane distribution of the different-period bioclastic shoal.

[0078] The analyzing of the plane distribution law of the different-period bioclastic shoal comprises the following steps:

[0079] Step S41: the target layer horizons are extracted from the multiple horizons automatically tracked from the bioclastic shoal sequence stratigraphic framework for geological interpretation, and the top and bottom horizons of the different-period bioclastic shoal are determined according to the drilling calibration results.

[0080] Step S42: isochronous stratigraphic slice analysis is performed on the bioclastic shoal horizons automatically tracked, and the plane distribution of the different-period bioclastic shoal is determined.

[0081] Step S5: the top and bottom horizons of the different-period bioclastic shoal are operated to obtain the development main body and reflection structure features of the different-period bioclastic shoal, and multi-period superimposed bioclastic shoal is quickly identified.

[0082] The development main body of the bioclastic shoal can be obtained by operating the top and bottom horizons of the different-period bioclastic shoal; the plane prediction result and the seismic profile of the bioclastic shoal development position are combined, and the spatial distribution of the multi-period superimposed bioclastic shoal can be dynamically, quickly and intuitively displayed, as shown in the following figure: Figures 7-9

[0083] The obtaining of the development main body and reflection structure features of the different-period bioclastic shoal comprises the following steps:

[0084] ​​Step S51: according to the top and bottom layer position of the bioclastic beach, the main part of each bioclastic beach is obtained;

[0085] Step S52: the reflection structure characteristics of different bioclastic beach main parts are determined by dynamically browsing the plane attribute and the seismic profile.

[0086] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for identifying a talus based on a reflection configuration, characterized by, A method for identifying a bioclastic shoal, comprising the following steps: Step S1: in combination with regional sedimentary background, determining a favorable facies belt of the bioclastic shoal development by using seismic facies and seismic attributes capable of representing the bioclastic shoal deposition, wherein the regional sedimentary background is the background of the development of the carbonate bioclastic shoal verified by the surface outcrop, drilling, logging and seismic data; The determination of the favorable facies belt of the bioclastic shoal development comprises the following steps: Step S11: on the basis of the regional sedimentary background, determining the development position and seismic reflection characteristics of the bioclastic shoal on the seismic profile according to the drilling and seismic synthetic record calibration; Step S12: selecting amplitude, phase or related statistical seismic attributes according to the seismic reflection characteristics to perform the bioclastic shoal plane prediction in a fixed time window; Step S13: further refining the favorable facies belt of the bioclastic shoal development by using the seismic waveform classification attribute; Step S14: comprehensively determining the favorable facies belt of the bioclastic shoal development by using multiple seismic attributes; Step S2: dividing the bioclastic shoal development stages by drilling-seismic calibration, and combining the forward modeling results to determine the seismic response characteristics and influencing factors of different stages of the bioclastic shoal, and establishing a bioclastic shoal identification mode, wherein the bioclastic shoal development stages are firstly determined by using the drilling lithology, cuttings and logging curve characteristics to determine the lithological combination relationship of the bioclastic shoal and the inter-shoal, and then the seismic response characteristics of different stages of the bioclastic shoal are determined by using the seismic synthetic record calibration; The establishment of the bioclastic shoal identification mode comprises the following steps: Step S21: performing fine calibration of the bioclastic shoal by using the drilling core, cuttings, logging data and seismic data, dividing the bioclastic shoal stages according to the actual lithology and lithofacies combination, and determining the seismic response characteristics of each stage of the bioclastic shoal; Step S22: establishing a forward model of the bioclastic shoal with different thicknesses, different frequencies, different stacking relationships, different velocities, different densities and different development positions according to the actual seismic profile reflection structure characteristics, performing forward modeling research, and analyzing the influencing factors affecting the reflection characteristics of different stages of the bioclastic shoal; Step S23: further improving the resolution of the seismic data to determine the seismic reflection structure and lateral distribution characteristics of each stage of the bioclastic shoal; Step S24: comprehensively combining the drilling-seismic calibration and the forward modeling results to establish the bioclastic shoal identification mode; Step S3: establishing a bioclastic shoal high-frequency sequence stratigraphic framework by a full three-dimensional automatic scanning interpretation technology, and determining the reflection structure and stacking characteristics of different stages of the bioclastic shoal, wherein the full three-dimensional automatic scanning interpretation technology is guided by seismic sedimentology, spatially deconstructs the seismic data volume to decompose multiple data nodes, realizes the optimal connection between adjacent two data nodes by combining automatic and manual methods, and finally obtains a high-precision bioclastic shoal high-frequency sequence stratigraphic framework, and determines the reflection structure of different stages of the bioclastic shoal from the high-frequency sequence stratigraphic framework by combining the drilling, logging and seismic synthetic record calibration; The determination of the reflection structure and stacking characteristics of different stages of the bioclastic shoal comprises the following steps: Step S31: guided by seismic sedimentology, establishing a three-dimensional data volume spatial grid node model by the optimal connection method of seismic data similarity and geological consistency, performing full three-dimensional bioclastic shoal automatic scanning interpretation, and calculating a bioclastic shoal high-frequency sequence stratigraphic framework; Step S32: Based on the calibration results of different-period bioclastic shoal wells, the high-frequency sequence stratigraphic framework of bioclastic shoal and the seismic profile, the seismic reflection structure, deposition, migration and superimposition characteristics of each period bioclastic shoal are comprehensively analyzed; Step S4: Isopachous stratigraphic slice analysis is performed by using the top and bottom horizons of different-period bioclastic shoals scanned automatically, the top and bottom horizons of different-period bioclastic shoals are extracted from the high-frequency sequence stratigraphic framework of bioclastic shoal according to the bioclastic shoal seismic calibration results, and the plane distribution law of different-period bioclastic shoals is analyzed; The analysis of the plane distribution law of different-period bioclastic shoals includes the following steps: Step S41: The target horizon is extracted from the multiple horizons traced automatically from the bioclastic shoal sequence stratigraphic framework for geological interpretation, and the top and bottom horizons of different-period bioclastic shoals are determined according to the drilling calibration results; Step S42: Isopachous stratigraphic slice analysis is performed by using the bioclastic shoal horizons traced automatically, and the plane distribution of different-period bioclastic shoals is determined; Step S5: The top and bottom horizons of different-period bioclastic shoals are operated to obtain the development main body and reflection structure characteristics of different-period bioclastic shoals, realize the rapid identification of multi-period superimposed bioclastic shoals, the development main body of bioclastic shoal is obtained by operating the top and bottom horizons of different-period bioclastic shoals, the plane prediction result is combined with the seismic profile of the development position of bioclastic shoal, and the spatial distribution of multi-period superimposed bioclastic shoal is displayed; The obtaining of the development main body and reflection structure characteristics of different-period bioclastic shoals includes the following steps: Step S51: The development main body position of each period bioclastic shoal is obtained according to the operation of the top and bottom horizons of bioclastic shoal; Step S52: The reflection structure characteristics of different bioclastic shoal main bodies are determined by dynamically browsing the plane attribute and the seismic profile.

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