Qualitative characterization method of relatively dominant seepage channels in meandering rivers at seismic scale

Abstract

The present invention relates to a method for qualitatively characterizing the relative dominant seepage channels of meandering rivers at the seismic scale. The method comprises the following steps: utilizing three-dimensional seismic data and combining well and seismic data to track and interpret the top and bottom interfaces of meandering river composite sand bodies; obtaining relative isochronous sedimentary interfaces between longitudinal phases within the meandering river composite sand bodies based on the top and bottom interfaces of the meandering river composite sand bodies based on the three-dimensional seismic data; obtaining relative isochronous sedimentary interfaces of the dominant seepage channels of the late-stage river channels within the meandering river composite sand bodies based on the three-dimensional seismic data; obtaining sensitive seismic attributes of the late-stage river channel reservoir within the meandering river composite sand bodies based on the three-dimensional seismic data; and qualitatively characterizing the dominant seepage flow of the meandering river channel sand bodies. Rapidly characterizing the dominant seepage channels of composite river channel sand bodies under sparse offshore well patterns provides important technical support for the efficient development and program adjustment of underground oil and gas reservoirs.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore oilfield development geological research, and in particular to a method for qualitatively characterizing relatively advantageous seepage channels in meandering rivers at seismic scales. Background Art

[0002] Waterflooding is the most common development method for sandstone oilfields and is widely used across various oilfields. Due to reservoir heterogeneity, injected water tends to advance along the dominant seepage channels, leading to the localized formation of residual oil. During the high water-cut period in offshore oilfields, the distribution of residual oil is complex. The distribution of residual oil is determined by the distribution characteristics of the sand bodies that flow through the dominant seepage channels, making it the primary geological factor controlling residual oil. Accurately characterizing and characterizing the dominant seepage channels within the reservoir is crucial for clarifying the distribution characteristics of residual oil and identifying the key challenges facing oilfield adjustments and potential exploitation. This directly impacts the deployment of injection and production well patterns and the selection of development methods during oil and gas field development.

[0003] Meandering river reservoirs are composed of multiple phases of point-bars. Influenced by lateral aggradational sedimentation, each phase of the point-bar consists of multiple lateral accumulation bodies and intercalations between them. The presence of intercalations within the point-bar makes the point-bar a typical "semi-connected body." That is, the sand body's interior, shielded by the intercalations, is disconnected (accounting for approximately 4 / 5 of the point-bar's thickness), while the retained sedimentary section at the riverbed is connected, serving as the dominant seepage channel (accounting for approximately 1 / 5 of the point-bar's thickness). Therefore, during waterflooding of the point-bar sand body, the injected water tends to form a dominant seepage channel at the bottom of the sand body, resulting in severe bottom waterlogging and high oil recovery efficiency. Meanwhile, the middle and upper portions of the reservoir, shielded by the lateral accumulation layers, experience less waterlogging and are therefore less susceptible to flooding, leading to a concentration of residual oil.

[0004] Currently, analysis of reservoir dominant flow pathways is primarily based on abundant production dynamics data, employing comprehensive methods such as injection-production effectiveness analysis, absorption profile analysis, and tracer analysis. However, these methods are often labor-intensive and time-consuming. Furthermore, existing techniques primarily rely on data from dense underground well networks. Clearly, for offshore oil and gas fields with sparse well patterns (well spacing typically exceeding 1000 m in the early stages, but locally reaching 200–500 m in the mid- to late-stage), existing techniques for analyzing dominant flow pathways in reservoir sand bodies are insufficiently accurate enough for offshore development. Therefore, it is necessary to fully utilize 3D seismic data and existing well data to develop a qualitative characterization method for the seismic-scale relative dominant flow pathways in meandering rivers based on relatively isochronous sedimentary interfaces. Summary of the Invention

[0005] In response to the above problems, the purpose of the present invention is to provide a method for qualitative characterization of the relatively dominant seepage channels of meandering rivers at the seismic scale based on relatively isochronous sedimentary interfaces, and to make full use of three-dimensional seismic data to carry out qualitative characterization of the relatively dominant seepage channels of meandering rivers at the seismic scale.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A qualitative characterization method for the relatively dominant seepage channels in meandering rivers at seismic scales, comprising:

[0008] Using 3D seismic data, the top and bottom interfaces of the meandering river composite sand body are interpreted through well-seismic combined tracking.

[0009] According to the top and bottom interfaces of the meandering river composite sand body, the relative isochronous sedimentary interfaces between longitudinal periods within the meandering river composite sand body are obtained based on 3D seismic data.

[0010] According to the relative isochronous sedimentary interfaces between the top and longitudinal stages of the meandering river composite sand body, the dominant seepage channels of the late river channel in the meandering river composite sand body were obtained based on 3D seismic data to analyze the relative isochronous sedimentary interfaces;

[0011] The relative isochronous sedimentary interface is analyzed based on the dominant seepage channels of the late-stage channel in the meandering river composite sand body, and the sensitive seismic attributes of the late-stage channel reservoir in the meandering river composite sand body are obtained based on 3D seismic data.

[0012] Based on the sensitive seismic attributes of the reservoir inside the meandering river composite sand body, the dominant seepage flow of the meandering river channel sand body was qualitatively characterized.

[0013] The relative isochronous sedimentary interfaces between longitudinal phases within the meandering river composite sand body obtained based on 3D seismic data include:

[0014] Using the top and bottom interfaces of the composite sand body interpreted by tracing as constraints, equal-scale stratigraphic slices were produced based on 3D seismic data.

[0015] The analysis results were obtained by merging stratigraphic slices of equal proportions and combining them with sedimentary geological characteristics using slice deduction analysis techniques;

[0016] Based on the analysis results, the relatively isochronous sedimentary interfaces between longitudinal stages within the meandering river composite sand body were obtained.

[0017] The relative isochronous sedimentary interfaces of the dominant seepage channels of the late-stage river channel within the meandering river composite sand body obtained based on 3D seismic data include:

[0018] Using the top of the composite sand body and the relatively isochronous sedimentary interface within the meandering river composite sand body interpreted by tracing as constraints, five equal-scale stratigraphic slices were produced based on 3D seismic data to obtain analysis results.

[0019] According to the analysis results, two-fifths of the equal-proportional interfaces were taken as the dominant seepage channels to analyze the relative isochronous deposition interface.

[0020] The sensitive seismic attributes of the late channel reservoir in the meandering river composite sand body are obtained based on 3D seismic data, including:

[0021] Based on the obtained relative isochronous sedimentary interface and the obtained dominant seepage channel, the relative isochronous surface was analyzed and the actual drilling reservoir thickness was statistically analyzed.

[0022] Based on the obtained relative isochronous sedimentary interface and the obtained dominant seepage channel, the relative isochronous surface is analyzed and seismic attributes are extracted.

[0023] A correlation analysis is performed on the extracted seismic attributes and reservoir thickness, and reservoir-sensitive seismic attributes are selected.

[0024] Qualitative characterization of the dominant seepage channels in meandering river sand bodies includes:

[0025] Based on the obtained relative isochronous sedimentary interface and the obtained dominant seepage channel, the relative isochronous surface was analyzed and the effective porosity and permeability of the actual drilling were statistically analyzed.

[0026] Based on the obtained sensitive seismic attributes of the dominant seepage channels, multi-attribute neural network clustering was carried out to obtain a preliminary seepage channel classification.

[0027] The preliminary seepage channel classification was calibrated based on the statistical results, and the dominant seepage channels in the river channel inside the composite sand body were obtained through well-seismic interaction to obtain the analysis results.

[0028] Based on the analysis results, the dominant percolation flow is visualized

[0029] The present invention has the following advantages due to the adoption of the above technical solution:

[0030] This paper discloses a method for qualitatively characterizing the relatively dominant seepage channels in meandering rivers at the seismic scale based on relatively isochronous sedimentary interfaces. This method utilizes three-dimensional seismic data and interactive slice and leveling to track and interpret the top and bottom interfaces of meandering river composite sand bodies. By employing a stratigraphic proportional slicing deduction method and well-seismic interaction, the relatively isochronous sedimentary interfaces between longitudinal stages within the meandering river composite sand bodies are obtained. Based on the "semi-connected" sedimentary model of meandering river point-bar sand bodies, combined with the sensitive seismic attributes of the dominant seepage channels and the physical properties of drilled reservoirs, a comprehensive analysis is conducted to qualitatively characterize the relatively dominant seepage channels in meandering river channel sand bodies. This in turn guides the analysis of the relatively dominant seepage channels in reservoir sand bodies, providing important technical support for tapping the potential of remaining underground oil and optimizing development well patterns.

[0031] In addition, it has the following advantages:

[0032] The combined well-seismic analysis method fully utilizes the rich three-dimensional seismic information to constrain the qualitative characterization of the reservoir's relatively dominant seepage channels, making up for the shortcomings of the reservoir's relatively dominant seepage channel analysis method based mainly on well information under sparse offshore well network conditions. It effectively reduces the uncertainty of reservoir connectivity prediction and improves the prediction efficiency of the reservoir's relatively dominant seepage channels. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. Throughout the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0034] Figure 1 is a flow chart of a method for qualitatively characterizing channel sandbody connectivity constrained by relatively isochronous sedimentary interfaces according to an embodiment of the present invention;

[0035] Figure 2 Schematic diagram of the top and bottom interfaces of a composite sand body tracked and interpreted based on three-dimensional seismic data according to an embodiment of the present invention;

[0036] Figure 3 A schematic diagram of a longitudinal relative isochronous sedimentary interface inside a composite sand body obtained through well-seismic interaction according to an embodiment of the present invention;

[0037] Figure 4 A schematic diagram of a relatively isochronous sedimentary interface obtained by using well-seismic interaction to characterize the dominant seepage channel of a late-stage river channel within a composite sand body according to an embodiment of the present invention;

[0038] Figure 5 To characterize the dominant seepage channel of the late-stage river channel within the composite sand body according to an embodiment of the present invention relative to the isochronous sedimentary interface constraint, reservoir sensitive seismic attributes and attribute clustering diagrams are obtained based on 3D seismic data;

[0039] Figure 6 Schematic diagram of the classification of seepage channels and the visualization representation of dominant seepage channels according to an embodiment of the present invention.

[0040] The symbols in the accompanying drawings represent the following: DETAILED DESCRIPTION

[0041] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0042] The present application relates to a method for qualitatively characterizing the relatively dominant seepage channels of a meandering river, and specifically to a method for qualitatively characterizing the relatively dominant seepage channels of a meandering river at a seismic scale based on a relatively isochronous sedimentary interface, and belongs to the technical field of geological research on offshore oilfield development.

[0043] The method for qualitatively characterizing the relative dominant seepage channels of a meandering river at a seismic scale relative to an isochronous sedimentary interface of the present invention comprises the following steps:

[0044] 1) Using 3D seismic data and combining well and seismic data, we can trace and interpret the top and bottom interfaces of the meandering river composite sand body;

[0045] 2) according to the top and bottom interfaces of the meandering river composite sand body, obtaining the relatively isochronous sedimentary interfaces between longitudinal stages within the meandering river composite sand body based on 3D seismic data;

[0046] 3) according to the top of the meandering river composite sand body and the relatively isochronous sedimentary interfaces between longitudinal stages within the meandering river composite sand body, the relatively isochronous sedimentary interfaces of the dominant seepage channels of the late river channel within the meandering river composite sand body are obtained based on 3D seismic data;

[0047] 4) analyzing the relative isochronous sedimentary interface based on the dominant seepage channels of the late-stage river channel within the meandering river composite sand body, and obtaining the sensitive seismic attributes of the late-stage river channel reservoir within the meandering river composite sand body based on 3D seismic data;

[0048] 5) Based on the sensitive seismic attributes of the reservoir inside the meandering river composite sand body, the dominant seepage flow of the meandering river channel sand body is qualitatively characterized.

[0049] Specifically, the method of obtaining the relatively isochronous sedimentary interfaces between longitudinal phases in the meandering river composite sand body based on three-dimensional seismic data comprises the following steps:

[0050] Step B1: Using the top and bottom interfaces of the composite sand body interpreted by tracing as constraints, make equal-scale stratigraphic slices based on 3D seismic data;

[0051] Step B2: merging the stratigraphic slices using slice deduction analysis technology in combination with sedimentary geological characteristics for the equal-scale stratigraphic slices;

[0052] Step B3: Based on the analysis results of step B2, obtain the relatively isochronous sedimentary interfaces between longitudinal periods within the initial meandering river composite sand body;

[0053] Step B4: Based on the analysis results of step B3 and the 3D seismic data, the relative isochronous sedimentary interface interpretation scheme is optimized by cross-section interaction to obtain the final relative isochronous sedimentary interface between longitudinal periods within the meandering river composite sand body.

[0054] Specifically, the method of obtaining the dominant seepage channel of the late-stage river channel inside the meandering river composite sand body based on 3D seismic data and analyzing the relative isochronous depositional interface comprises the following steps:

[0055] Step C1: Using the top of the composite sand body and the relatively isochronous sedimentary interface within the meandering river composite sand body interpreted by tracing as constraints, five equal-scale stratigraphic slices are produced based on the 3D seismic data;

[0056] Step C2: Based on the analysis results of step C1, two-fifths of the equal-proportional interfaces are taken as the dominant seepage channels to analyze the relative isochronous deposition interface.

[0057] Specifically, obtaining the sensitive seismic attributes of the late-stage channel reservoir inside the meandering river composite sand body based on three-dimensional seismic data includes the following steps:

[0058] Step D1: Analyze the relative isochronous surface based on the relative isochronous sedimentary interface obtained in step 2 and the dominant seepage channel obtained in step 3, and calculate the actual drilling reservoir thickness;

[0059] Step D2: Analyze the relative isochronous surface based on the relative isochronous sedimentary interface obtained in step 2 and the dominant seepage channel obtained in step 3, and extract seismic attributes;

[0060] Step D3:

[0061] Specifically, the qualitative characterization of the dominant seepage channels of the meandering river channel sand body includes the following steps:

[0062] Step F1: Analyze the relative isochronous surface based on the relative isochronous sedimentary interface obtained in step 2 and the dominant seepage channel obtained in step 3, and calculate the effective porosity and permeability of the actual drilling;

[0063] Step F2: Based on the sensitive seismic attributes of the dominant seepage channels obtained in step 4, multi-attribute neural network clustering is performed to obtain a preliminary seepage channel classification;

[0064] Step F3: calibrate the preliminary seepage channel classification of step F2 based on the statistical results of step F1, and interact with wells and seismic data to obtain the dominant seepage channel of the river channel inside the composite sand body;

[0065] Step F4: Based on the analysis results of step F3, the dominant seepage flow is visualized.

[0066] Example 1

[0067] Example 1 provides a qualitative characterization method for the relative dominant seepage channels of meandering rivers at seismic scales based on relatively isochronous sedimentary interfaces, such as Figure 1 As shown, the following steps are included:

[0068] Step A: Using 3D seismic data, well-seismic combination, and interactive tracking to interpret the top and bottom interfaces of the composite sand body;

[0069] Depend on Figure 2 It can be seen that based on the 3D seismic data, the top and bottom interfaces of the target sedimentary sand body can be tracked and interpreted.

[0070] Step B, using 3D seismic data, to determine the relative isochronous sedimentary interfaces between longitudinal phases within the meandering river composite sand body, the specific steps are as follows:

[0071] Step B1: Select a typical well, perform wavelet transform on the GR curve, perform single well and well-connected sequence analysis based on the curve characteristics, and obtain the initial well-surface relative isochronous sedimentary interface;

[0072] Step B2: Using the top and bottom interfaces of the composite sand body interpreted by tracing as constraints, make stratigraphic slices based on the 3D seismic data;

[0073] Step B3: Based on the initial well-surface relative isochronous sedimentary interface and sedimentary geological characteristics, slice deduction is used to merge the equal-proportion slices of the formation to obtain the initial relative isochronous sedimentary interface;

[0074] Step B4: Using the initial relative isochronous depositional interface as a constraint, the “well-seismic interaction” is used to optimize the relative isochronous depositional interface based on 3D seismic data to obtain the final relative isochronous depositional interface between longitudinal periods within the meandering river composite sand body.

[0075] Depend on Figure 3 It can be seen that the target sedimentary body is divided into two phases of composite channel deposits, early and late, based on the relative isochronous depositional interface.

[0076] Step C, based on 3D seismic data, obtains the sensitive seismic attributes of each reservoir stage within the meandering river composite sand body, and the specific steps are as follows:

[0077] Step C1: Based on the relative isochronous sedimentary interfaces of the composite sand body top and the meandering river composite sand body obtained in steps 1) and 2), five equal-proportion stratigraphic slices are prepared based on the 3D seismic data;

[0078] Step C2: Based on the isochronous stratigraphic slice results, two-fifths of the isochronous interfaces are selected as the dominant seepage channels to analyze the relative isochronous sedimentary interfaces;

[0079] Depend on Figure 4 It can be seen that the dotted line in the figure is the relative isochronous deposition interface of the dominant seepage channel analysis.

[0080] Step D, based on 3D seismic data, obtains the sensitive seismic attributes of the late channel reservoir inside the meandering river composite sand body, and the specific steps are as follows:

[0081] Step D1: Analyze the relative isochronous surface based on the relative isochronous sedimentary interface obtained in step 2 and the dominant seepage channel obtained in step 3, and calculate the actual drilling reservoir thickness;

[0082] Step D2: Analyze the relative isochronous surface based on the relative isochronous sedimentary interface obtained in step 2 and the dominant seepage channel obtained in step 3, and extract reservoir seismic attributes;

[0083] Step D3: Perform correlation analysis on the extracted seismic attributes and reservoir thickness, and select reservoir-sensitive seismic attributes.

[0084] Depend on Figure 5 -As can be seen from the left, the target reservoir is mainly distributed on both sides of the middle and eastern part, and the west side is mainly composed of mudstone deposits.

[0085] Step F, qualitative characterization of the dominant seepage channels in the meandering river sand body, the specific steps are as follows:

[0086] Step F1: Analyze the relative isochronous surface based on the relative isochronous sedimentary interface obtained in step 2 and the dominant seepage channel obtained in step 3, and calculate the effective porosity and permeability of the actual drilling;

[0087] Step F2: Based on the reservoir sensitive seismic attributes obtained in step 4, multi-attribute neural network clustering is performed to obtain a preliminary seepage channel classification;

[0088] Depend on Figure 5 -As can be seen from the right, the sensitive attributes of the target layer reservoir can be divided into four categories: ① to ④, among which categories ① to ③ are reservoirs, and category ④ is non-reservoir.

[0089] Step F3: calibrate the preliminary seepage channel classification of step F2 based on the statistical results of step F1, and interact with wells and seismic data to obtain the dominant seepage channel of the river channel inside the composite sand body;

[0090] Depend on Figure 6 -It can be seen from the left that the seepage channels of the river channel sand body inside the meandering river composite sand body can be divided into three categories: I, II, and III. Among them, the I type seepage channel is the dominant seepage channel with an average porosity of 32% and an average permeability of 3600mD, showing the characteristics of high porosity and high permeability; the II type seepage channel has an average porosity of 15% and an average permeability of 1600mD; the III type seepage channel has an average porosity of 8% and an average permeability of 100mD.

[0091] Step F4: Based on the analysis results of step F3, the dominant seepage flow is visualized with the top surface structure of the sand body as the background.

[0092] Depend on Figure 6 As can be seen from the right, the dominant seepage channels within the meandering river composite sand body are located at structural highs and structural slopes. The structure and distribution of the dominant seepage channels should be fully considered when designing well locations.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for qualitatively characterizing the relatively dominant seepage channels of a meandering river at seismic scale, characterized by: include: Using 3D seismic data, the top and bottom interfaces of the meandering river composite sand body are interpreted through well-seismic combined tracking. According to the top and bottom interfaces of the meandering river composite sand body, relatively isochronous sedimentary interfaces between longitudinal periods within the meandering river composite sand body are obtained based on 3D seismic data; According to the top of the meandering river composite sand body and the relatively isochronous sedimentary interfaces between longitudinal stages within the meandering river composite sand body, the relatively isochronous sedimentary interfaces of the dominant seepage channels of the late river channel within the meandering river composite sand body are obtained based on 3D seismic data; According to the analysis of the relative isochronous sedimentary interface based on the dominant seepage channel of the late river channel in the meandering river composite sand body, the sensitive seismic attributes of the late river channel reservoir in the meandering river composite sand body are obtained based on 3D seismic data; Based on the sensitive seismic attributes of the reservoir inside the meandering river composite sand body, the dominant seepage flow of the meandering river channel sand body is qualitatively characterized.

2. The method for qualitatively characterizing the relatively dominant seepage channels of a meandering river at seismic scale according to claim 1 is characterized in that: The method of obtaining the relatively isochronous sedimentary interfaces between longitudinal periods within the meandering river composite sand body based on 3D seismic data includes: Using the top and bottom interfaces of the composite sand body interpreted by tracing as constraints, equal-scale stratigraphic slices were produced based on 3D seismic data. The equal-scale stratigraphic slices are sliced ​​and combined with sedimentary geological characteristics, and the stratigraphic slices are merged using a slice deduction analysis technique to obtain analysis results; According to the analysis results, relatively isochronous sedimentary interfaces between longitudinal stages within the meandering river composite sand body are obtained.

3. The method for qualitatively characterizing the relative dominant seepage channels of a meandering river at seismic scale according to claim 1 is characterized in that: The relative isochronous sedimentary interface of the dominant seepage channel of the late river channel inside the meandering river composite sand body obtained based on 3D seismic data includes: Using the top of the composite sand body and the relatively isochronous sedimentary interface within the meandering river composite sand body interpreted by tracing as constraints, five equal-scale stratigraphic slices were produced based on 3D seismic data to obtain analysis results. According to the analysis results, two-fifths of the equal-proportional interfaces were taken as the dominant seepage channels to analyze the relative isochronous deposition interfaces.

4. The method for qualitatively characterizing the relatively dominant seepage channels of a meandering river at seismic scale according to claim 1 is characterized in that: The method of obtaining the sensitive seismic attributes of the late channel reservoir inside the meandering river composite sand body based on 3D seismic data includes: Based on the obtained relative isochronous sedimentary interface and the obtained dominant seepage channel, the relative isochronous surface was analyzed and the actual drilling reservoir thickness was statistically analyzed.

5. The method for qualitatively characterizing the relatively dominant seepage channels of a meandering river at seismic scale according to claim 4 is characterized in that: Based on the obtained relative isochronous sedimentary interface and the obtained dominant seepage channel, the relative isochronous surface is analyzed and seismic attributes are extracted.

6. The method for qualitatively characterizing the relatively dominant seepage channels of a meandering river at seismic scale according to claim 5 is characterized in that: A correlation analysis is performed on the extracted seismic attributes and reservoir thickness, and reservoir-sensitive seismic attributes are selected.

7. The method for qualitatively characterizing the relative dominant seepage channels of a meandering river at seismic scale according to claim 1 is characterized in that: The qualitative characterization of the dominant seepage channels of the meandering river channel sand bodies includes: Based on the obtained relative isochronous sedimentary interface and the obtained dominant seepage channel, the relative isochronous surface was analyzed and the effective porosity and permeability of the actual drilling were statistically analyzed.

8. The method for qualitatively characterizing the relatively dominant seepage channels of a meandering river at seismic scale according to claim 7 is characterized in that: Based on the obtained sensitive seismic attributes of the dominant seepage channels, multi-attribute neural network clustering was carried out to obtain a preliminary seepage channel classification.

9. The method for qualitatively characterizing the relatively dominant seepage channels of a meandering river at seismic scale according to claim 8, characterized in that: The preliminary seepage channel classification was calibrated based on the statistical results, and the dominant seepage channels in the river channel inside the composite sand body were obtained through well-seismic interaction to obtain the analysis results.

10. The method for qualitatively characterizing the relatively dominant seepage channels in meandering rivers at seismic scale according to claim 9, characterized in that: Based on the analysis results, the dominant percolation flow is visualized.

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