A method and device for determining formation pinch-out line based on virtual well

Abstract

A method and device for determining a formation pinch-out line based on a virtual well, the method comprising: determining an initial position of the formation pinch-out line based on a comparison of drilled formations, and establishing multiple virtual wells; resampling original seismic data, and establishing a time-depth relationship for each virtual well; extracting multiple attribute parameters of the virtual well bypass channel, and obtaining a pseudo-curve corresponding to each attribute parameter in the depth domain based on the time-depth relationship of the virtual well; and performing a virtual well-to-well comparison based on the pseudo-curve of the virtual well to determine the final position of the formation pinch-out line.

Description

Technical Field

[0001] This article relates to the field of petroleum 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-lithologic oil and gas reservoirs. Due to the influence of seismic data quality and resolution, it is difficult to effectively locate and characterize the pinch-out line by directly using seismic amplitude, energy and other attributes in the process of searching for effective stratigraphic traps.

[0003] Previous researchers have done a lot of research on the identification of pinch-out lines. In development blocks with more drilling, they mainly use stratigraphic sequence analysis of multiple wells, detailed comparison of small layers and sand bodies, and comparison of connected wells to determine the location of the pinch-out line. For exploration blocks with fewer drilling wells, they mainly use seismic data frequency enhancement processing technology, seismic frequency and phase attribute analysis technology, seismic reflection angle analysis technology and geological statistics to describe the stratigraphic pinch-out line in detail. Summary of the Invention

[0004] The inventors discovered that:

[0005] In development blocks with a large number of wells, 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 lithologic change lines can be identified more accurately. However, this method is limited to mature development blocks with a large number of wells.

[0006] For exploration or evaluation blocks with few drilling wells, predecessors have proposed some technical methods for identifying and characterizing pinch-out lines based on seismic data analysis, mainly based on seismic waveform, amplitude or frequency attributes. However, due to limitations such as the signal-to-noise ratio of seismic data, diffraction waves, vertical and horizontal resolution, and the relationship between strata and lithologic combinations, the thinner strata near the pinch-out line of some intervals cannot independently form an effective seismic reflection event change trend. 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, identifying formation pinch-out lines based solely on seismic attributes still has certain limitations.

[0007] The present invention proposes a method for determining a formation pinch-out line based on a virtual well, which can solve the problem that a small number of wells are drilled in an oil reservoir 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 the small layers of the drilled wells and the virtual wells to effectively improve the prediction accuracy of the formation pinch-out line, thereby providing support for the evaluation and development of stratigraphic-lithologic 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 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] 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;

[0013] Based on 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 implement 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 related technologies, the present application provides a method and device for determining a formation pinch-out line based on a virtual well. The method includes: determining the initial position of the formation pinch-out line based on a detailed comparison of the drilled formation, and establishing multiple virtual wells; resampling the original seismic data and establishing a time-depth relationship for each virtual well; extracting multiple attribute parameters of the virtual well bypass channel, and obtaining a pseudo-curve corresponding to each attribute parameter in the depth domain based on the time-depth relationship of the virtual well; performing a 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. By establishing multiple virtual wells and further establishing a pseudo-curve for each well, the present application effectively improves the prediction accuracy of the formation pinch-out line by using a detailed comparative analysis of the "pseudo-curves" of the small layers of the drilled wells and the virtual wells, providing support for the evaluation and development of stratigraphic lithologic trap oil and gas reservoirs.

[0017] Other features and advantages of the present application will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present application. Other advantages of the present application can be realized and obtained by the solutions 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 in an embodiment of the present application;

[0020] Figure 2 Schematic diagram of a device for determining a formation pinch-out line based on a virtual well according to an embodiment of the present application;

[0021] Figure 3 A comparison diagram of Carboniferous strata and pinch-out line well connections 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 a seismic cross section 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 Schematic diagram of a virtual well cross-section comparison of 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 energy ratio attributes of each frequency band in a time-frequency analysis of a virtual well in some exemplary embodiments. DETAILED DESCRIPTION

[0027] This application describes multiple embodiments, but this description is exemplary rather than restrictive, and it will be apparent to those skilled in the art that there may be more embodiments and implementations within the scope of the embodiments described herein. Although many possible feature combinations are shown in the drawings and discussed in the detailed description, 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] This 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 this application may also be combined with any conventional features or elements to form a unique inventive solution defined by the claims. Any features or elements of any embodiment may also be combined with features or elements from other inventive solutions to form another unique inventive solution defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in this application may be implemented individually or in any appropriate combination. Therefore, except for the limitations made according to the appended claims and their equivalents, the embodiments are not subject to other limitations. In addition, various modifications and changes may be made within the scope of protection of the appended 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 in the specific order described. As will be understood by those skilled in the art, other orders of steps are also possible. Therefore, the specific order 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 performing their steps in the order written, and those skilled in the art can readily understand that these orders 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. Figure 1 As shown, the method includes steps S100-S130:

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

[0032] S110: resampling the original seismic data and establishing a time-depth relationship for 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 based on the pseudo curve corresponding to the depth domain multi-attribute to determine 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 based on formations and lithologies 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 location of the formation pinch-out based on the seismic tectonic interpretation results and the contact relationship of the formations. In this embodiment, well-to-well comparison of existing wells is carried out, and high-precision stratigraphic sequence analysis and small-layer comparison are performed to establish the stratigraphic and lithologic group frameworks of each small layer. Through small-layer comparison, the contact relationship of the formations, the variation pattern of the formation thickness, and the preliminary location of the formation pinch-out are determined;

[0039] In one exemplary embodiment, the process of establishing multiple virtual wells includes: establishing multiple virtual wells at the initial location of the formation pinch-out line according to a low density value; and establishing multiple virtual wells at the initial location outside the formation pinch-out line according to a high density value. Virtual wells are established at different reservoir structures, lithologic variations, and suspected pinch-out line locations. The principle of establishing virtual wells is to have a virtual well density of 1,000 square meters per well at locations near the suspected pinch-out line to reflect changes in formation thickness and lithologic composition. Virtual wells are to be established more frequently near the suspected pinch-out line, with a density of 200 square meters per well, to ensure a sufficient number of virtual well samples for accurately determining the pinch-out line.

[0040] In an exemplary embodiment, resampling the original seismic data and establishing a time-depth relationship for each virtual well includes:

[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. The seismic data with a sampling rate of 2ms was resampled to 0.5ms to increase the number of vertical samples of the seismic data and provide a basis for the subsequent calculation of the well bypass seismic multi-attribute curve.

[0043] Step 2. Using the finely calibrated and resampled seismic data from 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 one exemplary embodiment, after resampling the original seismic data and establishing a time-depth relationship for each virtual well, the method further includes: extracting seismic information from wellside channels of the drilled wells, performing time-frequency analysis of the wellside channels, and determining the relationship between wellside channel seismic information and changes in formation lithology and thickness; determining the relationship between formations and lithology, and between formations and seismic amplitude based on the time-frequency relationship, and determining sensitive parameters. In this embodiment, high-precision seismic data resampled from finely calibrated drilled wells is used to establish an accurate time-depth relationship. Fine well-seismic calibration of sublayers and lithology is further performed, and time-frequency analysis of the drilled wellside channels is performed simultaneously. The relationship between sublayer and lithology combinations and seismic amplitude and waveform is analyzed, laying the foundation for subsequent analysis of seismic attribute characteristics near the formation pinch-out line.

[0046] In an exemplary embodiment, extracting multiple attribute parameters of a 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 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 and determining 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 side channels of drilled wells and virtual wells in the entire area are extracted, and converted through the determined time-depth relationship to obtain multi-attribute "pseudo-curves" in the depth domain. The "true curves" of the drilled electrical logging curves are used to further calibrate the "pseudo-curves" and determine the "marker parameters" in the "pseudo-curves" in each sub-layer. Based on the marker parameters, sub-layer comparison in the entire area is carried out to establish a comparison grid for the entire area.

[0051] In an exemplary embodiment, establishing a stratigraphic comparison framework for the entire region based on marker parameters and determining the final position of the stratigraphic pinch-out line includes:

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

[0053] The planar 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 variation trends of the marker 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 the corresponding pinch-out lines. 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 conducting formation comparison of "pseudo-curves" of multiple virtual wells and determining formation pinch-out lines. The method comprises establishing multiple virtual wells near an initial pinch-out point, extracting the waveform, amplitude, frequency, and phase information of seismic signals from the virtual well side channels, and converting the time-depth relationship to form "pseudo-curves" reflecting the seismic attributes of the virtual well side channels. A detailed comparative analysis of the "pseudo-curves" of the sub-layers of the drilled wells and the virtual wells is then conducted. The vertical and horizontal variations of the seismic attribute "pseudo-curves" of each sub-layer and near the formation pinch-out line are analyzed, and the variation patterns of the "pseudo-curves" near the formation pinch-out line are summarized. Based on the extracted seismic attributes corresponding to the "pseudo-curves", the prediction accuracy of the formation pinch-out line can be effectively improved, providing support for the evaluation and development of stratigraphic-lithologic trap 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 having a data processing program stored thereon. The data processing program is used by a processor to execute the method for determining a formation pinch-out line based on a virtual well according to any one of the above embodiments.

[0058] Example 1

[0059] The following example uses the Carboniferous strata in a basin in western China as an example to illustrate the method of determining the pinch-out line of a Carboniferous sub-layer 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 drilled wells

[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 lithologic group framework of each small layer, and judge the contact relationship of the strata through fine comparison of small layers. Figure 3From the comparison diagram, 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 diagram, 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 preliminary position of the stratigraphic pinch-out by combining the stratigraphic contact relationship determined by the well-connected comparison map with the seismic structural interpretation results.

[0063] like Figure 5 The figure shows a seismic profile of the stratigraphy and pinch-out line in a basin in western China. Based on the results of seismic tectonic interpretation, the location of stratigraphic thinning or pinch-out is determined. The preliminary locations of the pinch-out of the lower Sangtamu Formation and the Lianglitage Tumuxiu Formation are clearly visible on the seismic profile.

[0064] Step 3: Create 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 in the figure, virtual wells are established at different structures, lithologic changes, and suspected pinch-out line locations in the reservoir. 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 lithologic 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] Step 4: Resample the seismic data.

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

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

[0070] Using the seismic data of the drilled wells after fine calibration and resampling, the regional marker layer is determined and the time-depth relationship of the drilled wells is established; based on the time-depth relationship of the drilled wells and combined with the determined regional marker layer, the time-depth relationship of the virtual well is established.

[0071] In this step, based on the time-depth relationship of the wells drilled in the study area and taking the regional marker layer as the standard, a virtual well time-depth relationship is established to establish a direct connection between the time domain seismic data and the depth domain well data; Figure 6As shown in Figure 3, the time-depth distribution of a single well in a basin in western China. Through the above calibration, a relatively consistent time-depth relationship is obtained for the drilled wells and virtual wells in the study area.

[0072] Step 6: Determine sensitive attributes.

[0073] For the wells with determined time-depth relationships, time-frequency relationship analysis of the wellside channel is carried out to analyze the corresponding relationship between the small layers and lithologic 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: Extract geophysical multi-information parameters of the virtual well side channel, and obtain a depth domain multi-attribute pseudo curve based on the time-depth relationship of the virtual well.

[0075] Extract multi-information geophysical parameters of the bypass paths of real wells and virtual wells in the entire area. For example, based on 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] Determining marker parameters based on 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" of each layer. Based on the mark parameters, the whole-area layer comparison is carried out to establish the whole-area comparison grid; 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 study area, the vertical and horizontal thickness variation trend of the layer is 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 infilled 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 Figure 2, 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 embodiments 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 connected wells in an exploration or evaluation block by establishing a large number of virtual wells, thereby effectively improving the accuracy of pinch-out line identification.

[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 is well 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 tape, 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 skilled in the art that communication media generally embodies 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; Extracting wellside channel seismic information from drilled wells and performing time-frequency analysis on the wellside channel seismic information; determining the relationship between the wellside channel seismic data and formation lithology, and between the wellside channel seismic data and formation thickness changes based on the time-frequency analysis; determining sensitive parameters based on the relationship between the wellside channel seismic data and formation lithology, and between the wellside channel seismic data and formation thickness changes; Extracting corresponding sensitive attribute parameters of the bypass channel of each virtual well according to the determined sensitive parameters; converting the extracted sensitive attribute parameters into a pseudo curve 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 to determine the final position of the formation pinch-out line.

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 as follows: Establish a well-connecting grid based on the 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 tectonic 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, wherein: The process of establishing multiple virtual wells includes: At the initial position of the formation pinch-out line, multiple 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, wherein: 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 resampled seismic data from the drilled wells, 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, wherein: The step of performing virtual well comparison based on the pseudo curve of the virtual well and determining the final position of the formation pinch-out line includes: Determining marker parameters based on the pseudo curve in the depth domain and the time-depth relationship of the virtual well; A multi-attribute well comparison framework is established based on the marker parameters to determine the final position of the formation pinch-out line.

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 establishing a multi-attribute well comparison framework based on the marker parameters and determining the final position of the formation pinch-out line includes: Establish a stratigraphic comparison framework based on 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.

7. A device for determining a formation pinch-out line based on a virtual well, characterized in that: The device includes: 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 according to any one of claims 1 to 6.

8. A computer-readable storage medium having a data processing program stored thereon, wherein a processor executes the method for determining a formation pinch-out line based on a virtual well according to any one of claims 1 to 6.

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