Establishment method, device, equipment and storage medium for shale oil and gas evaluation

Abstract

The present invention belongs to the field of geophysical exploration technology and discloses a method for establishing shale oil and gas evaluation. The method comprises loading horizons on a 2D planar map and displaying faults on the horizons; sequentially traversing fault data points to calculate the fault throw values ​​at the fault data points; setting a fault throw threshold and a fault reference zone range value, and drawing the fault reference zone for the fault data point by comparing the fault throw threshold with the fault throw value; connecting the edges of each fault reference zone based on the obtained positions to form several closed areas, and using the obtained closed areas as evaluation areas; calculating the projected area of ​​each evaluation area, and performing a comprehensive evaluation based on the obtained projected area and the geological characteristics of each evaluation area. The present invention also discloses a device, equipment, and storage medium for establishing shale oil and gas evaluation. The present invention, through the method for establishing shale oil and gas evaluation, can provide a basis for reservoir evaluation and horizontal well drilling trajectory design.

Description

Technical Field

[0001] The present invention belongs to the field of geophysical exploration technology and relates to a method, device, equipment and storage medium for shale oil and gas evaluation. Background Art

[0002] As an unconventional clean energy, shale oil and gas has become a hot spot for exploration and development due to its abundant resources and successful large-scale development in the United States.

[0003] Horizontal well drilling technology is crucial in shale oil and gas production. Before drilling a horizontal well in an oilfield, a horizontal well trajectory must be designed on a 2D planar map loaded with the target strata and faults. If the fault throw is less than a threshold at a specific location, the horizontal well should be avoided. If the fault throw is greater than or equal to this threshold, the fault throw difference at each location and the geological conditions within a certain range surrounding the fault are generally required to determine the next horizontal well drilling location. Currently, users typically manually identify locations where the fault throw exceeds the threshold, record the throw, and draw a specific area on either side of the fault, known as the fault reference zone. Seismic horizons are then segmented and marked on the 2D planar map based on the fault. This process is time-consuming, labor-intensive, and requires significant accuracy improvement. Therefore, a method for shale oil and gas evaluation is urgently needed. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for establishing shale oil and gas evaluation, which uses a 2D plan view loaded with target layers and faults to calculate fault throw values ​​to obtain a fault reference area. Based on the fault reference area, an evaluation area is obtained for comprehensive evaluation. On this basis, further reservoir evaluation can be carried out and a basis for horizontal well drilling trajectory design can be provided.

[0005] Another object of the present invention is to provide a device, equipment and storage medium for shale oil and gas evaluation.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] A method for establishing shale oil and gas evaluation includes the following steps:

[0008] S1. Obtain a 2D plane map of the area to be measured with target layers and faults loaded therein, load horizons on the 2D plane map, and display all faults on the horizons;

[0009] S2. Obtain each fault data point according to the survey line number and seismic channel number, traverse the fault data points in turn, and calculate the fault distance value D at the fault data point j ;

[0010] S3. Set the fault distance threshold Dthred And the fault reference area range value L wid , compare the fault distance threshold D thred and fault distance D j , if the fault distance value D j Less than the fault distance threshold D thred , then the fault reference area corresponding to the fault data point will not be drawn; if the fault distance value D j Greater than or equal to the fault distance threshold D thred , then draw the fault reference area corresponding to the position of the fault data point, and the distance between the boundary of the fault reference area and the fault center line is L wid ;

[0011] S4. Connecting the edges of each fault reference area to form a plurality of closed areas according to the obtained positions of each fault reference area, and using the obtained closed areas as evaluation areas;

[0012] S5. Calculate the projected area S of each evaluation area, and perform a comprehensive evaluation based on the obtained projected area S and the geological characteristics of each evaluation area.

[0013] As a limitation, in step S2, the coordinates of each fault data point are obtained according to the survey line number and seismic channel number (INLINE0, XLINE0, Z0), (INLINE1, XLINE1, Z1), (INLINE2, XLINE2, Z2), ..., (INLINE j , XLINE j , Z j )…,(INLINE n , XLINE n , Z n ), where INLINE j is the jth survey line number, XLINE j is the jth earthquake channel number, Z j is the height value, j = 0, 1, 2, ..., n, where n is the total number of fault data points;

[0014] Traverse the fault data points in sequence (INLINE j , XLINE j , Z j ), set the layer search point step size STEP = 1, and get four coordinates (INLINE j -STEP, XLINE j ), (INLINE j +STEP, XLINE j ), (INLINE j , XLINE j -STEP), (INLINEj , XLINE j +STEP) to find the coordinate height difference set D of the fault data points. epth ; In the fault data point coordinate height difference set D epth Middle height greater than Z j Find the height and Z from the fault data points j The minimum absolute value of the difference D part1 , and the coordinate height difference set D of the fault data points epth Middle height is less than Z j Find the height and Z from the fault data points j The minimum absolute value of the difference D part2 , then the fault data point (INLINE j , XLINE j , Z j ) at the fault throw value D j D part1 +D part2 ;

[0015] If the coordinate height difference set D of the fault data points found in the square area epth No height greater than Z j Or no height is less than Z j If a fault data point is found, the layer search point step size STEP is increased by 1, and step S2 is repeated.

[0016] As a second limitation, in step S5, the formula for calculating the projected area S of each evaluation area is:

[0017]

[0018] Among them, (X0, Y0) is the initial coordinate of the discrete points on the edge of the evaluation area, (X i , Y i ) is the i-th coordinate of the discrete point on the edge of the evaluation area, (X i+1 , Y i+1 ) is the i+1th coordinate of the discrete point on the edge of the evaluation area, (X N , Y N ) are the coordinates of the endpoints of the discrete points on the edge of the evaluation area.

[0019] The present invention also discloses a device for establishing shale oil and gas evaluation, comprising:

[0020] The fault display module is used to obtain a 2D plane map of the area to be measured with target layers and faults loaded, load horizons on the 2D plane map, and display all faults on the horizons;

[0021] The fault distance calculation module is used to obtain each fault data point according to the survey line number and seismic channel number, traverse the fault data points in sequence, and calculate the fault distance value D at the fault data point. j ;

[0022] Fault reference area module, used to set the fault distance threshold D thred And the fault reference area range value L wid , compare the fault distance threshold D thred and fault distance D j , if the fault distance value D j Less than the fault distance threshold D thred , then the fault reference area corresponding to the fault data point will not be drawn; if the fault distance value D j Greater than or equal to the fault distance threshold D thred , then draw the fault reference area corresponding to the position of the fault data point, and the distance between the boundary of the fault reference area and the fault center line is L wid ;

[0023] An evaluation region determination module is used to connect the edges of each fault reference region to form a plurality of closed regions according to the obtained positions of each fault reference region, and use the obtained closed regions as evaluation regions;

[0024] The evaluation module is used to calculate the projected area S of each evaluation area and conduct a comprehensive evaluation based on the obtained projected area S and the geological characteristics of each evaluation area.

[0025] The present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store at least one computer program, and the at least one computer program is loaded by the processor and executed by the method for establishing shale oil and gas evaluation.

[0026] The present invention also provides a storage medium, which is used to store at least one computer program, and the at least one computer program is used to execute the method for establishing shale oil and gas evaluation.

[0027] Due to the adoption of the above technical solution, the present invention has achieved the following technical advancements compared with the prior art:

[0028] (1) The present invention uses a 2D planar map loaded with target layers and faults to calculate the fault throw value to obtain a fault reference area. Based on the fault reference area, an evaluation area is obtained for comprehensive evaluation. On this basis, further reservoir evaluation can be carried out and a basis for horizontal well drilling trajectory design can be provided;

[0029] (2) The present invention sets the fault distance threshold D thred And the fault reference area range value L wid, the position of each fault reference area can be obtained, and the edges of each fault reference area can be connected using broken lines to obtain several evaluation areas, and a comprehensive evaluation can be performed based on the geological characteristics of each evaluation area.

[0030] In summary, the present invention can provide a basis for reservoir evaluation and horizontal well drilling trajectory design through the establishment method of shale oil and gas evaluation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Shown is a flow chart of the method of Example 1 of the present invention;

[0032] Figure 2 FIG. 1 is a schematic diagram showing loading horizons and displaying faults on a 2D plane map in Example 1 of the present invention;

[0033] Figure 3 Schematic diagram of the fault reference area in Example 1 of the present invention;

[0034] Figure 4 Shown is a schematic diagram of the names and projected areas of the evaluation areas in Example 1 of the present invention;

[0035] Figure 5 FIG2 is a block diagram of an apparatus according to Embodiment 2 of the present invention;

[0036] Figure 6 FIG2 is a schematic structural diagram of a computer device according to Embodiment 2 of the present invention;

[0037] Figure 7 FIG. 1 is a schematic diagram showing the structure of a computer storage medium according to Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0038] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0039] Example 1: A method for establishing shale oil and gas evaluation

[0040] like Figure 1 As shown, this embodiment is a method for establishing shale oil and gas evaluation, comprising the following steps:

[0041] S1. Obtain a 2D plane map of the area to be measured with target layers and faults, load layers on the 2D plane map, and display all faults on the layers; Figure 2 The figure shows a schematic diagram of loading a layer and displaying a fault on a 2D plane map, in which a layer data and a fault data are displayed;

[0042] S2. Obtain each fault data point according to the survey line number and seismic channel number, traverse the fault data points in turn, and calculate the fault distance value D at the fault data point j ;

[0043] The specific process of this step is:

[0044] According to the survey line number and seismic channel number, the coordinates of each fault data point are obtained (INLINE0, XLINE0, Z0), (INLINE1, XLINE1, Z1), (INLINE2, XLINE2, Z2), ..., (INLINE j , XLINE j , Z j )…,(INLINE n , XLINE n , Z n ), where INLINE j is the jth survey line number, XLINE j is the jth earthquake channel number, Z j is the height value, j = 0, 1, 2, ..., n, where n is the total number of fault data points;

[0045] Traverse the fault data points in sequence (INLINE j , XLINE j , Z j ), set the layer search point step size STEP = 1, and get four coordinates (INLINE j -STEP, XLINE j ), (INLINE j +STEP, XLINE j ), (INLINE j , XLINE j -STEP), (INLINE j , XLINE j +STEP) to find the coordinate height difference set D of the fault data points. epth ; In the fault data point coordinate height difference set D epth Middle height greater than Z j Find the height and Z from the fault data points j The minimum absolute value of the difference D part1 , and the coordinate height difference set D of the fault data points epth Middle height is less than Z j Find the height and Z from the fault data points j The minimum absolute value of the difference D part2 , then the fault data point (INLINE j , XLINE j , Z j ) at the fault throw value D j D part1 +Dpart2 ;

[0046] If the coordinate height difference set D of the fault data points found in the square area epth No height greater than Z j Or no height is less than Z j If there is a fault data point, the layer search point step STEP is increased by 1, and step S2 is repeated;

[0047] S3. Set the fault distance threshold D thred And the fault reference area range value L wid , compare the fault distance threshold D thred and fault distance D j , if the fault distance value D j Less than the fault distance threshold D thred , then the fault reference area corresponding to the fault data point will not be drawn; if the fault distance value D j Greater than or equal to the fault distance threshold D thred , then draw the fault reference area corresponding to the position of the fault data point, and the distance between the boundary of the fault reference area and the fault center line is L wid ;

[0048] Among them, the interruption distance threshold D in this step thred Set to 20, the fault reference area range value L wid Set to 200;

[0049] like Figure 3 Shown is a schematic diagram of the fault reference area, which shows the established fault reference area;

[0050] S4. According to the obtained positions of the fault reference areas, the edges of the fault reference areas are connected by broken lines to form several closed areas, and the obtained closed areas are all used as evaluation areas. Since the evaluation area is an irregular polygon, the coordinates of its edge discrete points are (X0, Y0), (X1, Y1), (X2, Y2), ... (X i , Y i )…,(X N , Y N ), where i = 1, 2, 3, 4, ... N;

[0051] S5. Calculate the projected area S of each evaluation area, and perform a comprehensive evaluation based on the obtained projected area S and the geological characteristics of each evaluation area;

[0052] In this step, the formula for calculating the projected area S of each evaluation area is:

[0053]

[0054] Among them, (X0, Y0) is the initial coordinate of the discrete points on the edge of the evaluation area, (X i , Y i ) is the i-th coordinate of the discrete point on the edge of the evaluation area, (X i+1 , Y i+1 ) is the i+1th coordinate of the discrete point on the edge of the evaluation area, (X N , Y N ) are the coordinates of the endpoints of the discrete points on the edge of the evaluation area.

[0055] like Figure 4 The figure shows a schematic diagram of the names and projected areas of each evaluation area. It can be seen from the figure that five evaluation areas are obtained in this embodiment, which are named units 1 to 5 in sequence, among which the projected area S of unit 1 is 5.98 square kilometers, the projected area S of unit 2 is 3.49 square kilometers, the projected area S of unit 3 is 3.74 square kilometers, the projected area S of unit 4 is 0.93 square kilometers, and the projected area S of unit 5 is 13.54 square kilometers.

[0056] Example 2: A Shale Oil and Gas Evaluation Apparatus, Equipment, and Storage Medium

[0057] like Figure 5 As shown, the present invention also discloses a device for establishing shale oil and gas evaluation, comprising:

[0058] The fault display module is used to obtain a 2D plane map of the area to be measured with target layers and faults loaded therein, load horizons on the 2D plane map, and display all faults on the horizons.

[0059] The fault distance calculation module is used to obtain each fault data point according to the survey line number and seismic channel number, traverse the fault data points in sequence, and calculate the fault distance value D at the fault data point. j .

[0060] Fault reference area module, used to set the fault distance threshold D thred And the fault reference area range value L wid , compare the fault distance threshold D thred and fault distance D j , if the fault distance value D j Less than the fault distance threshold D thred , then the fault reference area corresponding to the fault data point will not be drawn; if the fault distance value D j Greater than or equal to the fault distance threshold D thred , then draw the fault reference area corresponding to the position of the fault data point, and the distance between the boundary of the fault reference area and the fault center line is L wid .

[0061] The evaluation area determination module is used to connect the edges of each fault reference area to form a number of closed areas according to the obtained positions of each fault reference area, and use the obtained closed areas as evaluation areas.

[0062] The evaluation module is used to calculate the projected area S of each evaluation area and conduct a comprehensive evaluation based on the obtained projected area S and the geological characteristics of each evaluation area.

[0063] Based on the same inventive concept, Figure 6 As shown, this embodiment also provides a computer device, including: at least a processor and a memory, the memory is used to store at least one computer program, and the at least one computer program is loaded by the processor and executes the method for establishing shale oil and gas evaluation in Example 1.

[0064] Based on the same inventive concept, Figure 7 As shown, this embodiment also provides a computer-readable storage medium, which is used to store at least one computer program, and the at least one computer program is used to execute the establishment method of shale oil and gas evaluation in Example 1.

[0065] It should be noted that a person skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods.

[0066] Furthermore, it should be appreciated that the computer-readable storage media (eg, memory) herein can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory.

[0067] It will also be appreciated by those skilled in the art that the various exemplary logic blocks, modules, circuits and algorithmic steps described in conjunction with the disclosure herein can be implemented as electronic hardware, computer software or a combination of the two. In order to clearly illustrate this interchangeability of hardware and software, a general description has been given of the functions of various schematic components, blocks, modules, circuits and steps. Whether this function is implemented as software or hardware depends on specific applications and the design constraints imposed on the entire system. Those skilled in the art can implement the function in various ways for each specific application, but this implementation decision should not be interpreted as causing a departure from the disclosed scope of the embodiments of the present invention.

[0068] It should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art may still modify the technical solutions described in the above embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for establishing shale oil and gas evaluation, characterized in that: The following steps are involved: S1. Obtain a 2D plane map of the area to be measured with target layers and faults loaded therein, load horizons on the 2D plane map, and display all faults on the horizons; S2. Obtain each fault data point according to the survey line number and seismic channel number, traverse the fault data points in turn, and calculate the fault distance value D at the fault data point j ; S3. Set the fault distance threshold D thred And the fault reference area range value L wid , compare the fault distance threshold D thred and fault distance D j , if the fault distance value D j Less than the fault distance threshold D thred , then the fault reference area corresponding to the fault data point will not be drawn; if the fault distance value D j Greater than or equal to the fault distance threshold D thred , then draw the fault reference area corresponding to the position of the fault data point, and the distance between the boundary of the fault reference area and the fault center line is L wid ; S4. Connecting the edges of each fault reference area to form a plurality of closed areas according to the obtained positions of each fault reference area, and using the obtained closed areas as evaluation areas; S5. Calculate the projected area S of each evaluation area, and perform a comprehensive evaluation based on the obtained projected area S and the geological characteristics of each evaluation area.

2. The method for establishing shale oil and gas evaluation according to claim 1, characterized in that: In step S2, the coordinates of each fault data point (INLINE0, XLINE0, Z0), (INLINE1, XLINE1, Z1), (INLINE2, XLINE2, Z2), ..., (INLINE j , XLINE j , Z j )…,(INLINE n , XLINE n , Z n ), where INLINE j is the jth survey line number, XLINE j is the jth earthquake channel number, Z j is the height value, j = 0, 1, 2, ..., n, where n is the total number of fault data points; Traverse the fault data points in sequence (INLINE j , XLINE j , Z j ), set the layer search point step size STEP = 1, and get four coordinates (INLINE j -STEP, XLINE j ), (INLINE j +STEP, XLINE j ), (INLINE j , XLINE j -STEP), (INLINE j , XLINE j +STEP) to find the coordinate height difference set D of the fault data points. epth ; In the fault data point coordinate height difference set D epth Middle height greater than Z j Find the height and Z from the fault data points j The minimum absolute value of the difference D part1 , and the coordinate height difference set D of the fault data points epth Middle height is less than Z j Find the height and Z from the fault data points j The minimum absolute value of the difference D part2 , then the fault data point (INLINE j , XLINE j , Z j ) at the fault throw value D j D part1 +D part2 ; If the coordinate height difference set D of the fault data points found in the square area epth No height greater than Z j Or no height is less than Z j If a fault data point is found, the layer search point step size STEP is increased by 1, and step S2 is repeated.

3. The method for establishing shale oil and gas evaluation according to claim 1 or 2, characterized in that: In step S5, the formula for calculating the projected area S of each evaluation area is: Among them, (X0, Y0) is the initial coordinate of the discrete points on the edge of the evaluation area, (X i , Y i ) is the i-th coordinate of the discrete point on the edge of the evaluation area, (X i+1 , Y i+1 ) is the i+1th coordinate of the discrete point on the edge of the evaluation area, (X N , Y N ) are the coordinates of the endpoints of the discrete points on the edge of the evaluation area.

4. A device for shale oil and gas evaluation, characterized in that: include: The fault display module is used to obtain a 2D plane map of the area to be measured with target layers and faults loaded, load horizons on the 2D plane map, and display all faults on the horizons; The fault distance calculation module is used to obtain each fault data point according to the survey line number and seismic channel number, traverse the fault data points in sequence, and calculate the fault distance value D at the fault data point. j ; Fault reference area module, used to set the fault distance threshold D thred And the fault reference area range value L wid , compare the fault distance threshold D thred and fault distance D j , if the fault distance value D j Less than the fault distance threshold D thred , then the fault reference area corresponding to the fault data point will not be drawn; if the fault distance value D j Greater than or equal to the fault distance threshold D thred , then draw the fault reference area corresponding to the position of the fault data point, and the distance between the boundary of the fault reference area and the fault center line is L wid ; An evaluation region determination module is used to connect the edges of each fault reference region to form a plurality of closed regions according to the obtained positions of each fault reference region, and use the obtained closed regions as evaluation regions; The evaluation module is used to calculate the projected area S of each evaluation area and conduct a comprehensive evaluation based on the obtained projected area S and the geological characteristics of each evaluation area.

5. A computer device, characterized in that: The computer device includes a processor and a memory, the memory is used to store at least one computer program, and the at least one computer program is loaded by the processor and executes the method for establishing shale oil and gas evaluation according to any one of claims 1 to 3.

6. A storage medium, characterized in that The storage medium is used to store at least one computer program, and the at least one computer program is used to execute the method for establishing shale oil and gas evaluation according to any one of claims 1 to 3.

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