Method and device for determining stratum pinching line based on virtual well

Abstract

The invention discloses a method and device for determining a stratum pinching line based on virtual wells, and the method comprises the steps: determining the initial position of the stratum pinching line according to the comparison of a drilled stratum, and building a plurality of virtual wells; performing resampling processing on the original seismic data, and establishing a time-depth relationship of each virtual well; extracting a plurality of attribute parameters of a well bypass of the virtual well, and obtaining a pseudo curve corresponding to each attribute parameter of a depth domain according to the time-depth relationship of the virtual well; and according to the pseudo curve of the virtual well, virtual well connection comparison is carried out, and the final position of the stratum pinching line is determined.

Description

Technical Field

[0001] The present invention relates to the field of oil exploration technology, and in particular to a method and device for determining a formation pinch-out line based on a virtual well. Background Art

[0002] The formation pinch-out line is of great significance in stratigraphic-lithological oil and gas reservoirs. In the process of searching for effective stratigraphic traps, it is difficult to effectively locate and characterize the pinch-out line directly using seismic amplitude, energy and other attributes due to the quality and resolution of seismic data.

[0003] Predecessors have done a lot of research on the identification of pinch-out lines. In development blocks with more drilling, the position of the pinch-out line is determined by mainly using stratigraphic sequence analysis of multiple wells, detailed comparison of small layers and sand bodies, and comparison of connected wells. For exploration blocks with fewer drillings, the stratigraphic pinch-out line is described in detail by mainly using seismic data frequency enhancement processing technology, seismic frequency and phase attribute analysis technology, seismic reflection angle analysis technology, and geological statistics. Summary of the invention

[0004] The inventors found that:

[0005] In development blocks with more drillings, detailed stratigraphic sequence analysis, sub-layer and sand body comparison can be carried out through abundant well data. Through comparison, stratigraphic pinch-out, overlap or lithology change lines can be identified more accurately, but this method is limited to mature development blocks with more drillings.

[0006] For exploration or evaluation blocks with fewer drillings, predecessors have proposed some technical methods based on seismic data analysis to identify and characterize pinch-out lines, mainly based on seismic waveforms, amplitude or frequency attributes. However, due to the limitations of seismic data signal-to-noise ratio, diffraction waves, vertical and horizontal resolution, and the relationship between strata and lithology, the thinner strata near the pinch-out line of some layers cannot form an effective seismic reflection event axis change trend alone. The termination of the seismic reflection axis near the formation pinch-out line does not represent the pinch-out of the formation. The seismic attribute changes near the pinch-out line are multi-solutionable, and the seismic attribute change line cannot fully represent the formation pinch-out line. Therefore, there are still certain limitations in identifying the formation pinch-out line based solely on seismic attributes.

[0007] The present invention provides a method for determining a formation pinch-out line based on a virtual well, which can solve the problem that a small number of oil reservoirs are drilled and it is difficult to accurately determine the pinch-out line position.

[0008] The present application provides a method and device for determining a formation pinch-out line based on a virtual well. The method establishes multiple virtual wells at the initial position of the pinch-out line, establishes a pseudo-curve for each well, and utilizes a detailed comparative analysis of the "pseudo-curves" of small layers of drilled wells and virtual wells to effectively improve the prediction accuracy of the formation pinch-out line, thereby providing support for the evaluation and development of stratigraphic-lithological trapped oil and gas reservoirs.

[0009] In a first aspect, the present application provides a method for determining a formation pinch-out line based on a virtual well, the method comprising:

[0010] Determine the initial position of the formation pinch-out line based on the detailed comparison of the drilled formations, and establish multiple virtual wells;

[0011] Resample the original seismic data and establish the time-depth relationship of each virtual well;

[0012] Extract multiple attribute parameters of the virtual well bypass channel, and obtain a pseudo curve corresponding to each attribute parameter in the depth domain according to the time-depth relationship of the virtual well;

[0013] According to the pseudo curve in the depth domain, a virtual well connection comparison analysis is performed to determine the final position of the formation pinch-out line.

[0014] In the second aspect, an embodiment of the present invention also provides a device for determining a formation pinch-out line based on a virtual well, the device comprising: a memory and a processor; the memory is used to store a program for determining a formation pinch-out line based on a virtual well, and the processor is used to read and execute the program for determining a formation pinch-out line based on a virtual well, and execute any one of the methods described in the above embodiments.

[0015] In a third aspect, an embodiment of the present invention further provides a computer-readable storage medium having a data processing program stored thereon, and the data processing program is executed by a processor to perform the method for determining a formation pinch-out line based on a virtual well as described in any one of the above embodiments.

[0016] Compared with the related art, the present application provides a method and device for determining the formation pinch-out line based on a virtual well, the method comprising: determining the initial position of the formation pinch-out line based on the detailed comparison of the drilled formation, and establishing multiple virtual wells; resampling the original seismic data, and establishing the time-depth relationship of each virtual well; extracting multiple attribute parameters of the virtual well bypass channel, and obtaining the pseudo-curve corresponding to each attribute parameter in the depth domain according to the time-depth relationship of the virtual well; performing virtual well-to-well comparison analysis based on the pseudo-curve in the depth domain to determine the final position of the formation pinch-out line. The present application establishes multiple virtual wells, and further establishes a pseudo-curve for each well, and uses the detailed comparative analysis of the "pseudo-curve" of the small layer of the drilled well and the virtual well to effectively improve the prediction accuracy of the formation pinch-out line, and provide support for the evaluation and development of stratigraphic lithological trap oil and gas reservoirs.

[0017] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by implementing the present application. Other advantages of the present application can be realized and obtained by the schemes described in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide an understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0019] Figure 1 This is a flow chart of a method for determining a formation pinch-out line based on a virtual well according to an embodiment of the present application;

[0020] Figure 2 This is a schematic diagram of a device for determining a formation pinch-out line based on a virtual well in an embodiment of the present application;

[0021] Figure 3 A comparison diagram of Carboniferous strata and pinch-out line wells in a basin in western China in some exemplary embodiments;

[0022] Figure 4 A schematic diagram of time-frequency analysis of a single well in some exemplary embodiments;

[0023] Figure 5 Schematic diagram of seismic profiles of stratigraphic formations and pinch-out lines in a basin in western China in some exemplary embodiments;

[0024] Figure 6 A schematic diagram of a time-depth distribution diagram of a single well in a basin in western China in some exemplary embodiments;

[0025] Figure 7 A schematic diagram of a virtual well comparison cross section showing energy ratio attributes of each frequency band in some exemplary embodiments;

[0026] Figure 8 A schematic diagram of a plane depicting a geological pinch-out line depicting the energy ratio attributes of each frequency band in a virtual well time-frequency analysis in some exemplary embodiments. DETAILED DESCRIPTION

[0027] The present application describes multiple embodiments, but the description is exemplary rather than restrictive, and it is obvious to those skilled in the art that there may be more embodiments and implementations within the scope of the embodiments described in the present application. Although many possible feature combinations are shown in the drawings and discussed in the specific embodiments, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with any other feature or element in any other embodiment, or may replace any other feature or element in any other embodiment.

[0028] The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in the present application may also be combined with any conventional features or elements to form a unique invention scheme defined by the claims. Any features or elements of any embodiment may also be combined with features or elements from other invention schemes to form another unique invention scheme defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in the present application may be implemented individually or in any appropriate combination. Therefore, except for the limitations made according to the attached claims and their equivalents, the embodiments are not subject to other restrictions. In addition, various modifications and changes may be made within the scope of protection of the attached claims.

[0029] In addition, when describing representative embodiments, the specification may have presented the method and / or process as a specific sequence of steps. However, to the extent that the method or process does not rely on the specific order of the steps described herein, the method or process should not be limited to the steps of the specific order described. As will be understood by those of ordinary skill in the art, other sequences of steps are also possible. Therefore, the specific sequence of the steps set forth in the specification should not be interpreted as a limitation to the claims. In addition, the claims for the method and / or process should not be limited to the steps of performing them in the order written, and those skilled in the art can easily understand that these sequences can be changed and still remain within the spirit and scope of the embodiments of the present application.

[0030] The embodiment of the present invention provides a method for determining a formation pinch-out line based on a virtual well, such as Figure 1 As shown, the method includes steps S100-S130:

[0031] S100: Determine the initial position of the formation pinch-out line based on the detailed comparison of the drilled formations, and establish multiple virtual wells;

[0032] S110: resampling the original seismic data and establishing the time-depth relationship of each virtual well;

[0033] S120: extracting multiple attribute parameters of the virtual well bypass channel, and obtaining a pseudo curve corresponding to each attribute parameter in the depth domain according to the time-depth relationship of the virtual well;

[0034] S130: performing virtual well multi-attribute well comparison according to the pseudo curve corresponding to the depth domain multi-attribute, and determining the final position of the formation pinch-out line.

[0035] In an exemplary embodiment, the process of determining the initial position of the formation pinch-out line is as follows:

[0036] Step 1. Establish a well connection grid of formations and lithology for the drilled wells;

[0037] Step 2. Determine the contact relationship of the strata through the well connection grid of the strata and lithology;

[0038] Step 3. Determine the preliminary position of the formation pinch-out based on the seismic structural interpretation results and the contact relationship of the formation. In this embodiment, the well connection comparison of the drilled wells is carried out, and the small layer comparison of the high-precision stratigraphic sequence analysis is carried out to establish the stratigraphic and lithological group framework of each small layer. Through the small layer comparison, the contact relationship of the formation, the change law of the formation thickness, and the preliminary position of the formation pinch-out are determined;

[0039] In an exemplary embodiment, the process of establishing multiple virtual wells includes: establishing multiple virtual wells according to small density values ​​at the initial position of the formation pinch-out line; establishing multiple virtual wells according to large density values ​​at the initial position of the non-formation pinch-out line. Virtual wells are established at different structures, lithology changes and suspected pinch-out line positions of the reservoir. The principle of establishment is that at the approximate position of the non-suspected pinch-out line, the number of virtual wells should reach 1,000 square meters per well, which can reflect the changes in formation thickness and lithology combination. Virtual wells should be established more densely near the suspected pinch-out line, reaching 200 square meters per well, to ensure a sufficient number of virtual well samples to accurately determine the pinch-out line.

[0040] In an exemplary embodiment, the original seismic data is resampled and the time-depth relationship of each virtual well is established, including:

[0041] Step 1. Resample the original seismic data;

[0042] The original seismic data was decomposed and reconstructed at multiple scales, and the seismic data was resampled from 2ms sampling rate to 0.5ms to increase the number of vertical samples of the seismic data and provide a basis for the subsequent calculation of well bypass seismic multi-attribute curves.

[0043] Step 2. Using the seismic data resampled after fine calibration of the drilled wells, determine the regional marker layers and establish the time-depth relationship of the drilled wells;

[0044] Step 3. Establish a virtual well time-depth relationship based on the time-depth relationship of the drilled wells and the determined regional marker layers.

[0045] In an exemplary embodiment, after resampling the original seismic data and establishing the time-depth relationship of each virtual well, the method further includes: extracting seismic information of the wellside channel of the drilled well, conducting time-frequency analysis of the wellside channel, and obtaining the relationship between the wellside channel seismic and the formation lithology and formation thickness changes; determining the relationship between the formation and lithology, and the formation and seismic amplitude according to the time-frequency relationship, and determining sensitive parameters. In this embodiment, the high-precision seismic data after fine calibration and resampling of the drilled well is used to establish an accurate time-depth relationship, and further fine well seismic calibration of small layers and lithology is performed. At the same time, the time-frequency relationship analysis of the wellside channel of the drilled well is carried out, and the combined relationship between the small layers and lithology combination and the seismic amplitude and waveform is analyzed, which lays the foundation for the subsequent analysis of the characteristics of seismic attributes near the formation pinch-out line. .

[0046] In an exemplary embodiment, the extracting multiple attribute parameters of the virtual well bypass channel and obtaining a pseudo curve corresponding to multiple attributes in the depth domain according to the time-depth relationship of the virtual well includes:

[0047] According to the determined sensitive parameters, corresponding sensitive attribute parameters of the bypass channel of each virtual well are extracted;

[0048] The extracted sensitive attribute parameters are converted into a pseudo curve in the depth domain according to the time-depth relationship of the virtual well.

[0049] In an exemplary embodiment, establishing a multi-attribute well comparison grid for the entire area based on the marker parameters to determine the final position of the formation pinch-out line includes: establishing a formation comparison grid for the entire area based on the marker parameters to determine the longitudinal and lateral thickness changes of the formation; extracting the planar distribution characteristics of sensitive attributes, and combining them with the structural interpretation results to determine the final position of the formation pinch-out line.

[0050] In this embodiment, seismic attribute parameters of the drilled wells and virtual well side channels in the entire area are extracted, and converted through the determined time-depth relationship to obtain a multi-attribute "pseudo-curve" in the depth domain. The "true curve" of the drilled electrical logging curve is used to further calibrate the "pseudo-curve", and the "marker parameters" in the "pseudo-curve" in each sublayer are determined. Based on the marker parameters, sublayer comparison in the entire area is carried out, and a comparison grid for the entire area is established.

[0051] In an exemplary embodiment, a stratigraphic comparison framework for the entire region is established based on the marker parameters to determine the final position of the stratigraphic pinch-out line, including:

[0052] Establish a stratigraphic comparison framework for the entire region based on the marker parameters to determine the vertical and horizontal thickness changes of the stratigraphic layers;

[0053] The plane distribution characteristics of seismic attributes are extracted and combined with the structural interpretation results to determine the final position of the stratigraphic pinch-out line.

[0054] In this embodiment, according to the longitudinal and lateral thickness change trends of the marking parameters in the "pseudo-curves" of each small layer of the drilled wells and virtual wells in the study area, the pinch-out lines of the key small layers are compared to form a corresponding pinch-out line. If the local pinch-out points are irregular, the virtual wells are further encrypted locally, and the multi-parameter comparison of the "pseudo-curve" is iterated to finally determine the formation pinch-out line.

[0055] The present invention proposes a method for carrying out formation comparison of "pseudo-curves" of multiple virtual wells and determining formation pinch-out lines. The method comprises the following steps: establishing multiple virtual wells near an initial pinch-out point, extracting the waveform, amplitude, frequency and phase information of seismic waves of the virtual well side channels, converting the time-depth relationship, forming a "pseudo-curve" reflecting the seismic properties of the virtual well side channels, and then carrying out a detailed comparative analysis of the "pseudo-curves" of the sub-layers of the drilled wells and the virtual wells, analyzing the vertical and horizontal changes of the "pseudo-curves" of the seismic properties of each sub-layer and near the formation pinch-out line, summarizing the change rules of the "pseudo-curves" near the formation pinch-out line, and then extracting the seismic properties corresponding to the "pseudo-curves". The method can effectively improve the prediction accuracy of the formation pinch-out line, and provide support for the evaluation and development of stratigraphic-lithological trapped oil and gas reservoirs.

[0056] The embodiment of the present invention also provides a device for determining a formation pinch-out line based on a virtual well, such as Figure 2 As shown, the device includes: a memory 200 and a processor 210; the memory is used to store a program for determining a formation pinch-out line based on a virtual well, and the processor is used to read and execute the program for determining a formation pinch-out line based on a virtual well, and execute any one of the methods described in the above embodiments.

[0057] An embodiment of the present invention further provides a computer-readable storage medium, on which a data processing program is stored. The data processing program is executed by a processor to perform the method for determining a formation pinch-out line based on a virtual well as described in any one of the above embodiments.

[0058] Example 1

[0059] The following example takes the Carboniferous strata in a basin in western China as an example to illustrate the method of determining the pinch-out line of the Carboniferous sub-layer strata based on a virtual well. The process is as follows:

[0060] Step 1: Establish a well-to-well comparison chart of formations and lithology based on the wells that have been drilled

[0061] Carry out well-to-well comparison of drilled wells, use the drilled wells to conduct high-precision stratigraphic sequence analysis and small-layer comparison, establish the stratigraphic and lithological group framework of each small layer, and judge the contact relationship of the strata through fine comparison of small layers. Figure 3From the comparison chart, we can see that: Sand Group 2 and Sand Group 3 are in an integrated relationship, Sand Group 0 and Sand Group 1 are also in an integrated contact relationship, Sand Group 0 is eroded as a whole, and part of the strata in Sand Group 1 is eroded. From the comparison chart, we can see that the pinch-out point is relatively clear. By combining well and seismic data to analyze the trend of thinning of the stratum thickness of each small layer, the preliminary position of the stratum pinch-out is determined.

[0062] The second step is to determine the initial position of the formation pinch-out by using the contact relationship of the strata determined by the well comparison map and combining it with the seismic structural interpretation results.

[0063] like Figure 5 The seismic profile of the strata and pinch-out line of a basin in western China is shown. Based on the results of seismic tectonic interpretation, the location of stratum thinning or pinch-out is determined. The preliminary location of the pinch-out of the lower segment of the Sangtamu Formation and the Lianglitage Tumuxiu Formation can be clearly seen from the seismic profile.

[0064] Step 3: Establish multiple virtual wells.

[0065] At the initial position of the formation pinch-out line, multiple virtual wells are established according to the small density value; at the initial position not at the formation pinch-out line, multiple virtual wells are established according to the large density value.

[0066] like Figure 5 As shown, virtual wells are established in different reservoir structures, lithology changes and suspected pinch-out line locations. The principle of establishment is that at the approximate location of the non-suspected pinch-out line, the number of virtual wells should reach 1,000 square meters per well, which can reflect the changes in formation thickness and lithology combination. Virtual wells should be established more densely near the suspected pinch-out line, reaching 200 square meters per well, to ensure a sufficient number of virtual well samples and accurately determine the pinch-out line.

[0067] The fourth step is to resample the seismic data.

[0068] The original seismic data was decomposed and reconstructed at multiple scales, and the seismic data was resampled from 2ms sampling rate to 0.5ms to increase the number of vertical samples of the seismic data and provide a basis for the subsequent calculation of well bypass seismic multi-attribute curves.

[0069] Step 5: Establish a time-depth relationship.

[0070] The seismic data after fine calibration and resampling of the drilled wells are used to determine the regional marker layers and establish the time-depth relationship of the drilled wells; the time-depth relationship of the virtual wells is established based on the time-depth relationship of the drilled wells and the determined regional marker layers.

[0071] In this step, according to the time-depth relationship of the wells drilled in the study area, the time-depth relationship of the virtual well is established with the regional marker layer as the standard, and the time-domain seismic data and the depth-domain well data are directly linked; Figure 6As shown in Figure 1, the time-depth distribution diagram of a single well in a basin in western China. Through the above calibration, a relatively consistent time-depth relationship between the drilled wells and the virtual wells in the study area was obtained.

[0072] Step 6: Determine sensitive attributes.

[0073] For the wells that have been drilled and the time-depth relationship has been determined, the time-frequency relationship analysis of the well side track is carried out to analyze the corresponding relationship between the small layers and lithology combinations and the seismic amplitude and waveform, and to optimize the matching relationship between the seismic attributes and the pinch-out line, laying the foundation for the subsequent analysis of the characteristics of the seismic attributes near the formation pinch-out line, such as Figure 4 The single well time-frequency analysis diagram shown above identifies the multi-band energy ratio attribute as a sensitive attribute for determining the pinch-out line.

[0074] Step 7: extracting geophysical multi-information parameters of the virtual well side track, and obtaining a depth domain multi-attribute pseudo curve according to the time-depth relationship of the virtual well.

[0075] Extract multi-information geophysical parameters of the bypass channels of real wells and virtual wells in the whole area. For example, according to the sensitive attribute determined in the sixth step as the energy ratio of each frequency band, extract the energy ratio attribute of each frequency band, and establish a multi-attribute "pseudo curve" in the depth domain through the time-to-depth conversion extracted in the fifth step.

[0076] Step 8. Establish a stratigraphic comparison framework for the entire area based on the marker parameters.

[0077] Determine the marker parameter according to the pseudo curve in the depth domain and the time-depth relationship of the virtual well;

[0078] In this step, the "true curve" of the actual drilling electrical logging curve is used to further calibrate the "pseudo curve" to determine the "marker parameters" in the "pseudo curve" in each sub-layer, and the sub-layer comparison of the whole area is carried out according to the mark parameters to establish the comparison framework of the whole area; Figure 7 The energy ratio attributes of each frequency band are shown in the virtual well comparison profile.

[0079] Step 9. Determine the final position of the formation pinch-out line.

[0080] According to the energy ratio attributes of each frequency band in the "pseudo-curve" of each layer in the drilled well and virtual well in the study area, the vertical and horizontal thickness change trends of the layers are reflected, and the pinch-out points of the key layers are compared to form the corresponding pinch-out line. If the local pinch-out points are irregular, the virtual wells are further encrypted locally, and the multi-parameter comparison of the "pseudo-curve" is iterated to finally determine the formation pinch-out line. Figure 8 As shown in the figure, the energy ratio attributes of each frequency band in the time-frequency analysis of the virtual well characterize the geological pinch-out line and the plane.

[0081] The method for determining the pinch-out line of a formation based on establishing virtual wells implemented in the embodiment of the present application solves the problem of a small number of well points in the method of determining the pinch-out line by comparing wells in an exploration or evaluation block by establishing a large number of virtual wells, thereby effectively improving the accuracy of pinch-out line recognition.

[0082] It will be appreciated by those skilled in the art that all or some of the steps, systems, and functional modules / units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those of ordinary skill in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

Claims

1. A method for determining a formation pinch-out line based on a virtual well, characterized in that: The method comprises: Determine the initial position of the formation pinch-out line based on the comparison of the drilled formations, and establish multiple virtual wells; Resample the original seismic data and establish the time-depth relationship of each virtual well; Extract multiple attribute parameters of the virtual well bypass channel, and obtain a pseudo curve corresponding to each attribute parameter in the depth domain according to the time-depth relationship of the virtual well; According to the pseudo curve of the virtual well, a virtual well connection comparison is performed and the final position of the formation pinch-out line is determined.

2. The method for determining a formation pinch-out line based on a virtual well according to claim 1, characterized in that: The process of determining the initial position of the formation pinch-out line is: Establish a well-connecting grid of drilled formations and lithologies; Determine the contact relationship of the strata through the well connection grid of the strata and lithology; The preliminary position of the stratum pinch-out is determined based on the seismic structural interpretation results and the contact relationship of the strata.

3. The method for determining a formation pinch-out line based on a virtual well according to claim 1, characterized in that: The process of establishing multiple virtual wells includes: At the initial position of the formation pinch-out line, a plurality of virtual wells are established according to a small grid density; At the initial position of the non-formation pinch-out line, multiple virtual wells are established according to the large grid density.

4. The method for determining a formation pinch-out line based on a virtual well according to claim 1, characterized in that: The resampling of the original seismic data and establishment of the time-depth relationship of each virtual well include: Resample the original seismic data; Using the seismic data resampled after calibration of the drilled wells, the regional marker layers are determined and the time-depth relationship of the drilled wells is established; A virtual well time-depth relationship is established based on the time-depth relationship of the drilled well and in combination with the determined regional marker layer.

5. The method for determining a formation pinch-out line based on a virtual well according to claim 1, characterized in that: After resampling the original seismic data and establishing the time-depth relationship of each virtual well, the method further includes: Extract the seismic information of the well side track of the drilled well and perform time-frequency analysis on the seismic information of the well side track; Determine the relationship between the well bypass seismic data and the formation lithology, and the relationship between the well bypass seismic data and the formation thickness change according to the time-frequency analysis; Sensitive parameters are determined based on the relationship between the well bypass seismic data and the formation lithology, and the relationship between the well bypass seismic data and the change in formation thickness.

6. The method for determining a formation pinch-out line based on a virtual well according to claim 5, characterized in that: The step of extracting multiple attribute parameters of the virtual well bypass channel and obtaining a pseudo curve corresponding to each attribute parameter in the depth domain according to the time-depth relationship of the virtual well includes: According to the determined sensitive parameters, corresponding sensitive attribute parameters of the bypass channel of each virtual well are extracted; The extracted sensitive attribute parameters are converted into a pseudo curve in the depth domain according to the time-depth relationship of the virtual well.

7. The method for determining a formation pinch-out line based on a virtual well according to claim 6, characterized in that: The step of performing virtual well connection comparison and determining the final position of the formation pinch-out line according to the pseudo curve of the virtual well includes: Determine the marker parameter according to the pseudo curve in the depth domain and the time-depth relationship of the virtual well; A multi-attribute well comparison framework is established according to the marker parameters to determine the final position of the formation pinch-out line.

8. The method for determining a formation pinch-out line based on a virtual well according to claim 1, characterized in that: The step of establishing a multi-attribute well comparison framework according to the marker parameters to determine the final position of the formation pinch-out line includes: Establish a stratigraphic comparison framework based on the marker parameters to determine the vertical and horizontal thickness changes of the stratigraphic layers; The planar distribution characteristics of sensitive attributes are extracted and combined with the structural interpretation results to determine the final position of the stratigraphic pinch-out line.

9. A device for determining a formation pinch-out line based on a virtual well, characterized in that: The device comprises: a memory and a processor; the memory is used to store a program for determining a formation pinch-out line based on a virtual well, and the processor is used to read and execute the program for determining a formation pinch-out line based on a virtual well, and execute the method described in any one of claims 1-8.

10. A computer-readable storage medium having a data processing program stored thereon, wherein the data processing program is executed by a processor to implement the method for determining a formation pinch-out line based on a virtual well as described in any one of claims 1 to 8.

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