Prediction method and device for stratum denudation pinching line

Abstract

The embodiment of the invention provides a stratum denudation pinching line prediction method and device, and the method comprises the steps: describing the initial position of a stratum denudation pinching line through analysis of regional geology and optimization of seismic attributes in combination with a seismic section; according to the initial position of the stratum denudation pinching line, a stratum denudation pinching point on the stratum denudation pinching line is selected; for each stratum denudation tip point, calculating an extrapolation distance of the stratum denudation tip point according to the target stratum thickness, the unconformity surface dip angle and the stratum dip angle of the stratum denudation tip point; and predicting the actual position of the stratum denudation pinching line according to the initial position of the stratum denudation pinching line and the extrapolation distance. According to the method, the position of the stratum denudation pinching line is predicted by using the stratum overlying pinching line method and the extrapolation distance of the stratum denudation pinching line, so that the identification precision of the stratum denudation pinching line is improved.

Description

Technical Field

[0001] The invention relates to the field of reservoir prediction in the petroleum industry, and in particular to a method and a device for predicting a stratum erosion pinch-out line. Background Art

[0002] Stratigraphic oil and gas reservoirs are an important type of oil and gas reservoirs, and they play an important role in the world's oil and gas reserves and production. In recent years, under the guidance of the lithologic stratigraphic oil and gas accumulation theory, a number of unconformity-related oil and gas reservoirs have been discovered in the carbonate strata of the Tarim Basin and Sichuan Basin in my country. Therefore, in-depth identification and research of stratigraphic pinch-out lines is of great significance to my country's oil and gas exploration.

[0003] The oil and gas reservoirs associated with unconformities in carbonate strata are widely distributed and have great potential for exploration and development. However, due to the quality of seismic data and the interference of seismic waves, there is often a large error between the pinch-out line of the formation tracked only based on seismic reflection characteristics and the actual pinch-out line of the formation. In recent years, the relevant technologies for determining the pinch-out line of the formation have developed rapidly, but these technical methods are mainly proposed for the identification of the pinch-out line of the formation overlap, which has certain limitations and scope of application. Although they have certain reference value for the identification of the pinch-out line of the denuded formation, they cannot be directly used due to their limitations. Summary of the invention

[0004] In view of the above problems, the present invention is proposed to provide a method for predicting a formation erosion pinch-out line that overcomes the above problems or at least partially solves the above problems.

[0005] In a first aspect, an embodiment of the present invention provides a method for predicting a stratum erosion pinch-out line, comprising:

[0006] By analyzing the regional geology and preferred seismic attributes, combined with the seismic profile, the preliminary position of the stratum erosion pinch-out line is described; according to the preliminary position of the stratum erosion pinch-out line, the stratum erosion pinch-out point on the stratum erosion pinch-out line is selected; for each stratum erosion pinch-out point, the extrapolated distance of the stratum erosion pinch-out point is calculated according to the stratum thickness of the target layer of the stratum erosion pinch-out point, the dip angle of the unconformity surface and the stratum dip angle; according to the preliminary position of the stratum erosion pinch-out line and the extrapolated distance, the actual position of the stratum erosion pinch-out line is predicted.

[0007] In one embodiment, the method of analyzing regional geology and preferred seismic attributes in combination with seismic profiles to describe the preliminary location of the stratigraphic erosion pinch-out line includes:

[0008] Through regional geological analysis, the area of ​​the stratigraphic erosion pinch-out line is determined; through the optimization of seismic attributes and in combination with seismic profiles, the distribution position of the stratigraphic erosion pinch-out line on the plane is described.

[0009] In one embodiment, the determining of the area of ​​the stratum erosion pinch-out line through regional geological analysis includes:

[0010] Based on the seismic reflection characteristics, observe whether there is stratum erosion from the seismic section; based on the characteristics of the region including structural characteristics and stratum thickness, comprehensively analyze the location of the macroscopic area of ​​stratum erosion.

[0011] In one embodiment, determining the position of the stratum erosion pinch-out line by optimizing the seismic attributes includes:

[0012] In the macro-region, through the analysis of one or more seismic attributes including amplitude, phase, frequency, waveform, and spectral decomposition, combined with drilling information, multiple seismic attributes are used to predict the stratum erosion pinch-out line, and one or more seismic attributes with the clearest pinch-out lines displayed by the seismic profile are taken as the optimal seismic attributes. The optimal seismic attributes are used in combination with the seismic profile to describe the distribution position of the stratum erosion pinch-out line on the plane.

[0013] In one embodiment, the calculating of the extrapolated distance of the stratum erosion pinch-out point according to the target stratum thickness, unconformity surface dip angle and stratum dip angle of the pinch-out point comprises:

[0014] The extrapolated distance is calculated according to the following formula:

[0015] X=v*cosα*sinβ / 4f*sin(β-α);

[0016] Among them, α is the dip angle of the unconformity surface; β is the dip angle of the formation; X is the extrapolated distance of the formation erosion pinch-out point; v is the formation velocity; and f is the frequency of the seismic data.

[0017] In one embodiment, predicting the actual position of the stratum erosion pinch-out line according to the preliminary position of the stratum erosion pinch-out line and the extrapolated distance includes:

[0018] According to the preliminary position of the stratum erosion pinch-out line and the extrapolated distance corresponding to each stratum erosion pinch-out point, the position of each stratum erosion pinch-out point on the stratum erosion pinch-out line is extrapolated by the length of the extrapolated distance to obtain the predicted stratum erosion pinch-out line position.

[0019] In a second aspect, an embodiment of the present invention provides a device for predicting a stratum erosion pinch-out line, comprising:

[0020] The calculation position module is used to describe the preliminary position of the stratigraphic erosion pinch-out line by analyzing the regional geology and optimizing the seismic attributes in combination with the seismic profile;

[0021] A pinch-out point selection module is used to select a stratum erosion pinch-out point on the stratum erosion pinch-out line according to a preliminary position of the stratum erosion pinch-out line;

[0022] A distance calculation module is used to calculate the extrapolated distance of each stratum denudation pinch-out point according to the stratum thickness of the target layer, the dip angle of the unconformity surface and the stratum dip angle of the stratum denudation pinch-out point;

[0023] The prediction module predicts the actual position of the stratum erosion pinch-out line according to the preliminary position of the stratum erosion pinch-out line and the extrapolated distance.

[0024] In one embodiment, the distance calculation module is specifically used to calculate the extrapolated distance of the stratum erosion pinch-out point according to the following formula:

[0025] X=v*cosα*sinβ / 4f*sin(β-α).

[0026] In a third aspect, an embodiment of the present invention provides a computing device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the program executed by the processor implements the method for predicting the stratum erosion pinch-out line.

[0027] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for predicting a stratum erosion pinch-out line is implemented.

[0028] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0029] The embodiment of the present invention provides a method and device for predicting a stratigraphic erosion pinch-out line. The method describes the preliminary position of the stratigraphic erosion pinch-out line by analyzing regional geology and preferred seismic attributes in combination with seismic profiles; selects stratigraphic erosion pinch-out points on the stratigraphic erosion pinch-out line according to the preliminary position of the stratigraphic erosion pinch-out line; calculates the extrapolated distance of each stratigraphic erosion pinch-out point according to the stratigraphic thickness of the target layer, the dip angle of the unconformity surface and the dip angle of the stratigraphic erosion pinch-out point; predicts the actual position of the stratigraphic erosion pinch-out line according to the preliminary position of the stratigraphic erosion pinch-out line and the extrapolated distance. In order to further improve the recognition accuracy of the stratigraphic erosion pinch-out line and save exploration and development investment, the embodiment of the present invention proposes a new recognition idea of ​​"regional geological analysis for area determination, seismic attribute analysis for location determination, and theoretical formula calculation for quantification" step by step control, forming a new method for identifying carbonate rock stratigraphic erosion pinch-out lines. The method of stratigraphic overlay pinch-out line and the extrapolated distance of stratigraphic erosion pinch-out line were used to predict the position of stratigraphic erosion pinch-out line, which improved the accuracy of stratigraphic erosion pinch-out line identification and is of great significance to my country's oil and gas exploration.

[0030] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0031] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0033] Figure 1 A flow chart of a method for predicting a stratum erosion pinch-out line provided by an embodiment of the present invention;

[0034] Figure 2 A DT1 prestack time migration section provided by an embodiment of the present invention;

[0035] Figure 3 The instantaneous phase profile over DT1 provided by the embodiment of the present invention;

[0036] Figure 4 A distribution diagram of stratum erosion pinch-out lines predicted by using amplitude attributes provided in an embodiment of the present invention;

[0037] Figure 5 A schematic diagram of the derivation of the theoretical formula for the stratum erosion pinch-out point provided in an embodiment of the present invention;

[0038] Figure 6 A distribution diagram of stratum erosion pinch-out lines calculated and predicted using a theoretical formula provided in an embodiment of the present invention;

[0039] Figure 7 A structural block diagram of a device for predicting stratum erosion pinch-off line provided by an embodiment of the present invention;

[0040] Figure 8 An example of an overall flow chart of step-by-step prediction of a method for predicting stratum erosion pinch-off lines provided in an embodiment of the present invention. DETAILED DESCRIPTION

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

[0042] In order to solve the problem of low accuracy of the above-mentioned stratum erosion pinch-out line identification method, the embodiment of the present invention provides a stratum erosion pinch-out line prediction method, and its flow chart is as follows: Figure 1 As shown, including:

[0043] S11. Describe the preliminary location of the stratigraphic erosion pinch-out line by analyzing the regional geology and selecting seismic attributes in combination with seismic profiles;

[0044] S12, selecting a stratum erosion pinch-out point on the stratum erosion pinch-out line according to the preliminary position of the stratum erosion pinch-out line;

[0045] S13, for each stratum erosion pinch-out point, calculating the extrapolated distance of the stratum erosion pinch-out point according to the stratum thickness of the target layer, the dip angle of the unconformity surface and the stratum dip angle of the stratum erosion pinch-out point;

[0046] S14. Predicting the actual position of the stratum erosion pinch-out line according to the preliminary position of the stratum erosion pinch-out line and the extrapolated distance.

[0047] In the above step S11, by analyzing the regional geology and the preferred seismic attributes, combined with the seismic profile, the preliminary position of the stratum erosion pinch-out line is described. In specific implementation, it can be achieved in the following ways:

[0048] Through regional geological analysis, the area of ​​the stratigraphic erosion pinch-out line is determined; through the optimization of seismic attributes and in combination with seismic profiles, the distribution position of the stratigraphic erosion pinch-out line on the plane is described.

[0049] Specifically, the areas where the stratigraphic erosion pinch-out line is determined through regional geological analysis include:

[0050] According to the seismic reflection characteristics, observe whether there is stratum erosion from the seismic section;

[0051] Based on the regional characteristics including structural features and stratigraphic thickness, the location of the macro-area of ​​stratigraphic erosion is comprehensively analyzed.

[0052] Specifically, the above observation of whether there is stratum erosion from the seismic section based on the seismic reflection characteristics should be based on the regional structural characteristics on the seismic section to determine the macroscopic area of ​​stratum erosion. If tectonic movement occurs in the study area to form a regional unconformity, there will be stratum erosion pinch-out below the unconformity. In areas with strong tectonic movement, the stratum erosion pinch-out phenomenon is obvious.

[0053] Since the thickness of the strata near the stratigraphic erosion pinch-out line often decreases significantly or even disappears, the seismic reflection on the seismic section often weakens or disappears in advance. Therefore, the above-mentioned characteristics of the region, including structural characteristics and stratigraphic thickness, comprehensively analyze the location of the macroscopic region of stratigraphic erosion, which can be carried out according to the seismic reflection characteristics on the seismic section. When the seismic reflection weakens or disappears, it can be confirmed that the area where the seismic reflection weakens or disappears is the macroscopic area where the stratigraphic erosion pinch-out line is located.

[0054] Combining the location of the stratigraphic erosion pinch-out line predicted by the aforementioned structural features and the location of the stratigraphic erosion pinch-out line predicted by the stratigraphic thickness, a comprehensive analysis is conducted on the location of the macroscopic area of ​​stratigraphic erosion.

[0055] Specifically, the above-mentioned determination of the position of the stratum erosion pinch-out line through seismic attribute optimization can be achieved, for example, by the following method:

[0056] In the macro-region, through the analysis of one or more seismic attributes including amplitude, phase, frequency, waveform, and spectral decomposition, combined with drilling information, multiple seismic attributes are used to predict the stratum erosion pinch-out line, and one or more seismic attributes with the clearest pinch-out lines displayed by the seismic profile are taken as the optimal seismic attributes. The optimal seismic attributes are used in combination with the seismic profile to describe the distribution position of the stratum erosion pinch-out line on the plane.

[0057] Specifically, the above-mentioned preferred determination of the position of the stratum erosion pinch-out line by using seismic attributes can be implemented, for example, according to the following method:

[0058] Figure 2 The figure shows the pre-stack time migration section through DT1, which reflects the stratigraphic erosion pinch-out line predicted based on the amplitude. At the pinch-out point, the seismic amplitude weakens until it disappears, indicating that the stratigraphic thickness becomes thinner until it pinches out. Figure 3 The figure shows the instantaneous phase section through DT1, which reflects the stratigraphic erosion pinch-out line predicted based on the phase. At the pinch-out point, the phase weakens until it disappears, indicating that the stratigraphic thickness becomes thinner until it pinches out.

[0059] Through the comparative analysis of these two attributes, Figure 2 The phenomenon of moderate earthquakes becoming weaker and eventually disappearing is more obvious than Figure 3 The phenomenon that the middle phase weakens and eventually disappears is more obvious, so it is believed that the amplitude attribute is most consistent with the actual drilling formation thickness, so the following invention embodiments preferably use the amplitude attribute.

[0060] The above confirmation of the position of the stratigraphic erosion pinch-out line can be carried out, for example, in a certain area of ​​a certain basin. In the certain area of ​​the basin, the distribution map describing the position of the stratigraphic erosion pinch-out line using the amplitude attribute is as follows: Figure 4 As shown, Figure 4The dotted line in the middle indicates the location of the stratum erosion pinch-out line. The markers PG5, DT1, and D2 are the locations of the deployed wells, which are used to verify whether the final calculated stratum erosion pinch-out line location is accurate.

[0061] By using the seismic data of the stratum erosion pinch-out point on the predicted stratum erosion pinch-out line, all the data required for the following calculation of the extrapolated distance can be obtained.

[0062] In one embodiment, the calculating of the extrapolated distance of the stratum erosion pinch-out point according to the target stratum thickness, unconformity surface dip angle and stratum dip angle of the pinch-out point comprises:

[0063] The extrapolated distance is calculated according to the following formula:

[0064] X=v*cosα*sinβ / 4f*sin(β-α);

[0065] The above formula can be obtained, for example, by the following method:

[0066] like Figure 5 As shown, AB represents the unconformity surface, the shaded part is the denuded stratum, and the length of BC is the required extrapolated distance. Point B is the stratum denudation pinch-out point on the predicted stratum denudation pinch-out line selected in the above step S12, and point C is the pinch-out point at the actual position of the stratum denudation pinch-out line described in the above step S14 obtained by calculation according to the formula, and the length X of BC is the required extrapolated distance.

[0067] In △ADB, sin(β-α)=H / AB; in △ACB, cosα=X / AB; combining the above two formulas, we get X=cosα*H / sin(β-α). According to the thin layer tuning principle, the end point of the seismic reflection event axis is often at λ / 4, that is, H=λ / 4. Substituting H=λ / 4 into the above formula, we get X=cosα*λ / 4sin(β-α), and λ=v / f, so we can deduce X=v*cosα*sinβ / 4f*sin(β-α).

[0068] Wherein, α is the dip angle of the unconformity surface; β is the dip angle of the formation; H is the thickness of the uneroded formation (for example, the unit may be m); X is the extrapolated distance of the formation erosion pinch-out point (for example, the unit may be m); v is the formation velocity (for example, the unit may be m / s); and f is the frequency of the seismic data (for example, the unit may be Hz).

[0069] In the above step S14, the actual position of the stratum erosion pinch-out line is predicted according to the preliminary position of the stratum erosion pinch-out line and the extrapolated distance, which can be achieved, for example, by the following method:

[0070] According to the preliminary position of the stratum erosion pinch-out line and the extrapolated distance corresponding to each stratum erosion pinch-out point, the position of each stratum erosion pinch-out point on the stratum erosion pinch-out line is extrapolated by the length of the extrapolated distance to obtain the predicted stratum erosion pinch-out line position.

[0071] The prediction of stratigraphic erosion pinch-out line can be carried out, for example, in a certain area of ​​a certain basin mentioned above. The distribution map of the predicted stratigraphic erosion pinch-out line in a certain area of ​​the basin is as follows: Figure 6 As shown, Figure 6 This is a schematic diagram of the extrapolated stratigraphic erosion pinch-out line. Figure 6 The middle dotted line is the formation erosion pinch-out line, where PG5, DT1, and D2 are the locations of deployed wells. Figure 4 As can be seen in Figure 2, the well numbered D2 is located on the formation erosion pinch-out line (shown by the dotted line). Figure 6 As shown, after the formation erosion pinch-out line is extrapolated, the location of the well numbered D2 is located inside the formation erosion pinch-out line.

[0072] An example of the overall process of the above-mentioned method for predicting the stratum erosion pinch-out line can be found in Figure 8 As shown, the process includes the following three steps:

[0073] 1. Determine the area of ​​the stratigraphic erosion pinch-out line based on structural features, stratigraphic thickness, and seismic reflection characteristics;

[0074] 2. Describe the location of the stratum erosion pinch-out line based on amplitude attributes, phase attributes, frequency attributes, and waveform clustering;

[0075] 3. Use theoretical formulas to derive and calculate, and calculate the extrapolated distance to determine the range of the stratum erosion pinch-out line.

[0076] Based on the same inventive concept, the embodiment of the present invention also provides a prediction device for stratum erosion pinch-out line, and the device structure diagram is as follows: Figure 7 As shown, including:

[0077] The calculation position module 71 is used to describe the preliminary position of the stratigraphic erosion pinch-out line by analyzing the regional geology and the preferred seismic attributes in combination with the seismic profile;

[0078] A pinch-out point selection module 72 is used to select a stratum erosion pinch-out point on the stratum erosion pinch-out line according to a preliminary position of the stratum erosion pinch-out line;

[0079] A distance calculation module 73 is used to calculate, for each stratum denudation pinch-out point, an extrapolated distance of the stratum denudation pinch-out point according to the stratum thickness of the target layer, the unconformity surface dip angle and the stratum dip angle of the stratum denudation pinch-out point;

[0080] The prediction module 74 predicts the actual position of the stratum erosion pinch-out line according to the preliminary position of the stratum erosion pinch-out line and the extrapolated distance.

[0081] In one embodiment, the distance calculation module is specifically used to calculate the extrapolated distance of the stratum erosion pinch-out point according to the following formula:

[0082] X=v*cosα*sinβ / 4f*sin(β-α).

[0083] Based on the same inventive concept, an embodiment of the present invention also provides a computing device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the program executed by the processor implements the method for predicting the stratum erosion pinch-out line.

[0084] Based on the same inventive concept, an embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for predicting the stratum erosion pinch-out line is implemented.

[0085] Since the principles of the problems solved by these devices are similar to the aforementioned method for predicting the stratum erosion pinch-out line, the implementation of the devices can refer to the implementation of the aforementioned method, and the repeated parts will not be repeated.

[0086] By analyzing the regional geology and the preferred seismic attributes, combined with the seismic profile, the preliminary position of the stratigraphic erosion pinch-out line is described; according to the preliminary position of the stratigraphic erosion pinch-out line, the stratigraphic erosion pinch-out point on the stratigraphic erosion pinch-out line is selected; for each stratigraphic erosion pinch-out point, the extrapolated distance of the stratigraphic erosion pinch-out point is calculated according to the stratigraphic thickness of the target layer, the dip angle of the unconformity surface and the dip angle of the stratigraphic erosion pinch-out point; according to the preliminary position of the stratigraphic erosion pinch-out line and the extrapolated distance, the actual position of the stratigraphic erosion pinch-out line is predicted. In order to further improve the recognition accuracy of the stratigraphic erosion pinch-out line and save exploration and development investment, a new identification idea of ​​"regional geological analysis for area determination, seismic attribute analysis for location, and theoretical formula calculation for quantification" is proposed, forming a new method for identifying the stratigraphic erosion pinch-out line of carbonate rocks. Among them, the method of referring to the stratigraphic overlap pinch-out line and the extrapolation distance of the stratigraphic erosion pinch-out line are used to predict the position of the stratigraphic erosion pinch-out line, which improves the accuracy of stratigraphic erosion pinch-out line identification and is of great significance to my country's oil and gas exploration.

[0087] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program code.

[0088] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0089] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0090] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0091] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for predicting a stratum erosion pinch-out line, characterized in that: include: By analyzing regional geology and selecting seismic attributes, combined with seismic profiles, the preliminary location of the stratigraphic erosion pinch-out line is described; According to the preliminary position of the stratum erosion pinch-out line, selecting a stratum erosion pinch-out point on the stratum erosion pinch-out line; For each stratum erosion pinch-out point, according to the stratum thickness of the target layer, the dip angle of the unconformity surface and the stratum dip angle of the stratum erosion pinch-out point, the extrapolated distance of the stratum erosion pinch-out point is calculated; The actual position of the stratum erosion pinch-out line is predicted according to the preliminary position of the stratum erosion pinch-out line and the extrapolated distance.

2. The method according to claim 1, characterized in that The method of analyzing regional geology and selecting seismic attributes, in combination with seismic profiles, describes the preliminary location of the stratigraphic erosion pinch-out line, including: Through regional geological analysis, determine the area of ​​stratum erosion pinch-out line; By optimizing seismic attributes and combining seismic sections, the distribution position of stratum erosion pinch-out lines on the plane is described.

3. The method according to claim 2, characterized in that The areas where the stratigraphic erosion pinch-out line is determined through regional geological analysis include: According to the seismic reflection characteristics, observe whether there is stratum erosion from the seismic section; Based on the regional characteristics including structural features and stratigraphic thickness, the location of the macro-area of ​​stratigraphic erosion is comprehensively analyzed.

4. The method according to claim 3, characterized in that Determining the position of the stratum erosion pinch-out line by optimizing the seismic attributes includes: In the macro-region, one or more seismic attributes including amplitude, phase, frequency, waveform, and spectral decomposition are analyzed in combination with drilling information; multiple seismic attributes are used to predict the stratum erosion pinch-out line, and one or more seismic attributes with the clearest pinch-out lines displayed by the seismic profile are taken as the optimal seismic attributes. The optimal seismic attributes are used in combination with the seismic profile to describe the distribution position of the stratum erosion pinch-out line on the plane.

5. The method according to claim 1, characterized in that Calculating the extrapolated distance of the stratum erosion pinch-out point according to the target stratum stratum thickness, unconformity surface dip angle and stratum dip angle of the pinch-out point comprises: The extrapolated distance is calculated according to the following formula: X=v*cosα*sinβ / 4f*sin(β-α); Among them, α is the dip angle of the unconformity surface; β is the dip angle of the formation; X is the extrapolated distance of the formation erosion pinch-out point; v is the formation velocity; and f is the frequency of the seismic data.

6. The method according to claim 1, characterized in that Predicting the actual position of the stratum erosion pinch-out line according to the preliminary position of the stratum erosion pinch-out line and the extrapolated distance includes: According to the preliminary position of the stratum erosion pinch-out line and the extrapolated distance corresponding to each stratum erosion pinch-out point, the position of each stratum erosion pinch-out point on the stratum erosion pinch-out line is extrapolated by the length of the extrapolated distance to obtain the predicted stratum erosion pinch-out line position.

7. A prediction device for stratum erosion pinch-out line, characterized in that: include: The calculation position module is used to describe the preliminary position of the stratigraphic erosion pinch-out line by analyzing the regional geology and optimizing the seismic attributes in combination with the seismic profile; A pinch-out point selection module is used to select a stratum erosion pinch-out point on the stratum erosion pinch-out line according to a preliminary position of the stratum erosion pinch-out line; A distance calculation module is used to calculate the extrapolated distance of each stratum erosion pinch-out point according to the stratum thickness of the target layer, the unconformity surface dip angle and the stratum dip angle of the stratum erosion pinch-out point; The prediction module predicts the actual position of the stratum erosion pinch-out line according to the preliminary position of the stratum erosion pinch-out line and the extrapolated distance.

8. The device according to claim 7, characterized in that The distance calculation module is specifically used to calculate the extrapolated distance of the stratum erosion pinch-out point according to the following formula: X=v*cosα*sinβ / 4f*sin(β-α).

9. A computing device, characterized in that include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the program executed by the processor implements the method for predicting the stratum erosion pinch-out line described in claims 1-6.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for predicting the stratum erosion pinch-out line according to claims 1-6 is implemented.

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