Method and device for determining minimum earthquake magnitude in micro-earthquake monitoring and electronic equipment

Abstract

The invention provides a method and device for determining the minimum earthquake magnitude in micro-earthquake monitoring and electronic equipment, and the method comprises the steps: obtaining an earthquake magnitude scanning interval and an earthquake magnitude scanning increment, traversing all earthquake source scanning grids, carrying out the successive scanning of each earthquake source scanning grid according to the earthquake magnitude scanning interval and the earthquake magnitude scanning increment, and obtaining the minimum earthquake magnitude in the micro-earthquake monitoring. Obtaining the magnitude of the seismic source scanning grid corresponding to the ith scanning; determining the seismic moment of the seismic source scanning grid corresponding to the ith scanning according to the magnitude, determining the amplitude value of the seismic source scanning grid corresponding to the ith scanning according to the seismic moment, and stopping scanning in response to the situation that the amplitude value of the seismic source scanning grid is greater than or equal to an amplitude threshold value, and taking the magnitude of the seismic source scanning grid corresponding to the ith scanning as the minimum magnitude of the seismic source scanning grid, sorting the minimum magnitude of each seismic source scanning grid, determining the minimum magnitude of the monitoring area, and optimizing the monitoring performance of the microseismic monitoring system based on the minimum magnitude by determining the minimum magnitude of the monitoring area.

Description

Technical Field

[0001] The present invention relates to the technical field of microseismic monitoring, and in particular to a method, device and electronic equipment for determining the minimum magnitude in microseismic monitoring. Background Art

[0002] Microseismic monitoring technology plays an important role in many scenarios such as coal mine earthquake monitoring, horizontal drilling and fracturing in coal mines, geothermal development and geological reservoir research. However, the existing microseismic monitoring system is still not perfect in determining the minimum magnitude (minimum detectable magnitude). Therefore, how to determine the minimum magnitude in microseismic monitoring has become an urgent problem to be solved. Summary of the invention

[0003] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0004] According to the first aspect of the present application, a method for determining the minimum magnitude in microseismic monitoring is provided, comprising: obtaining a source monitoring area, dividing the source monitoring area into grids, and obtaining a plurality of source scanning grids; obtaining a preset magnitude scanning interval and a magnitude scanning increment, traversing all source scanning grids, and scanning each source scanning grid successively according to the magnitude scanning interval and the magnitude scanning increment to obtain the magnitude of the source scanning grid corresponding to the i-th scan, wherein i is a natural number greater than or equal to 1; determining the seismic moment of the source scanning grid corresponding to the i-th scan according to the magnitude, and determining the amplitude value of the source scanning grid corresponding to the i-th scan according to the seismic moment; in response to the amplitude value of the source scanning grid being greater than or equal to an amplitude threshold, stopping the scanning, and taking the magnitude of the source scanning grid corresponding to the i-th scan as the minimum magnitude of the source scanning grid; sorting the minimum magnitude of each source scanning grid, and determining the minimum magnitude of the monitoring area according to the sorting result.

[0005] According to a second aspect of the present application, a device for determining the minimum magnitude in microseismic monitoring is provided, comprising: a grid division module, used to obtain a source monitoring area, grid the source monitoring area, and obtain a plurality of source scanning grids; a scanning module, used to obtain a preset magnitude scanning interval and a magnitude scanning increment, traverse all source scanning grids, and scan each source scanning grid successively according to the magnitude scanning interval and the magnitude scanning increment to obtain the magnitude of the source scanning grid corresponding to the i-th scanning, wherein i is a natural number greater than or equal to 1; the first determination module is used to obtain a preset magnitude scanning interval and a magnitude scanning increment, traverse all source scanning grids, and scan each source scanning grid successively according to the magnitude scanning interval and the magnitude scanning increment to obtain the magnitude of the source scanning grid corresponding to the i-th scanning, wherein i is a natural number greater than or equal to 1; A determination module is used to determine the seismic moment of the source scanning grid corresponding to the i-th scan according to the magnitude, and determine the amplitude value of the source scanning grid corresponding to the i-th scan according to the seismic moment; a second determination module is used to stop scanning in response to the amplitude value of the source scanning grid being greater than or equal to an amplitude threshold, and take the magnitude of the source scanning grid corresponding to the i-th scan as the minimum magnitude of the source scanning grid; a third determination module is used to sort the minimum magnitude of each source scanning grid, and determine the minimum magnitude of the monitoring area according to the sorting result.

[0006] The third aspect of the present application proposes an electronic device, characterized in that it includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the program, it implements the method for determining the minimum magnitude in microseismic monitoring as described in the first aspect.

[0007] The fourth aspect of the present application proposes a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable the computer to execute the method for determining the minimum magnitude in microseismic monitoring described in the first aspect.

[0008] A fifth aspect of the present application proposes a computer program product, comprising a computer program, which, when executed by a processor, implements the method for determining the minimum magnitude in microseismic monitoring according to the first aspect.

[0009] The technical solution provided by the embodiments of the present application includes at least the following beneficial effects:

[0010] The present application provides a method for determining the minimum magnitude in microseismic monitoring. By automatically determining the minimum magnitude of a monitoring area, it reduces human calculation errors, improves the efficiency of determining the minimum magnitude of a monitoring area, and ensures the accuracy and reliability of the minimum magnitude. Based on the minimum magnitude, it can provide data support for the design and optimization of a microseismic monitoring system, so that the microseismic monitoring system can achieve the best monitoring effect.

[0011] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to better understand the present solution and do not constitute a limitation of the present application.

[0013] Figure 1 A schematic flow chart of a method for determining the minimum magnitude in microseismic monitoring provided in an embodiment of the present application;

[0014] Figure 2 A schematic diagram of a source scanning grid division provided in an embodiment of the present application;

[0015] Figure 3 A schematic flow chart of another method for determining the minimum magnitude in microseismic monitoring provided in an embodiment of the present application;

[0016] Figure 4 A schematic diagram of the structure of a device for determining the minimum magnitude in microseismic monitoring provided in an embodiment of the present application;

[0017] Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0018] The following is a description of exemplary embodiments of the present application in conjunction with the accompanying drawings, including various details of the embodiments of the present application to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0019] The following embodiment is used to explain in detail the method for determining the minimum magnitude in microseismic monitoring of the present application.

[0020] Figure 1 A schematic flow chart of a method for determining the minimum magnitude in microseismic monitoring provided in an embodiment of the present application.

[0021] like Figure 1 As shown, the method for determining the minimum magnitude in microseismic monitoring proposed in this embodiment specifically includes the following steps:

[0022] S101, obtaining a seismic source monitoring area, dividing the seismic source monitoring area into grids, and obtaining a plurality of seismic source scanning grids.

[0023] Optionally, in monitoring of horizontal drilling and fracturing in underground coal mines, potential earthquake-causing areas, namely, earthquake source monitoring areas, can be obtained based on geological parameters and historical earthquake data.

[0024] In an embodiment of the present application, after the earthquake source monitoring area is acquired, the earthquake source monitoring area can be divided into grids to obtain multiple earthquake source scanning grids.

[0025] For example, Figure 2 As shown in the figure, the range of the grid can be set according to the range of the earthquake source monitoring area using the X-axis, Y-axis and Z-axis, where the X-axis is the east-west direction and the range is from X to Z. min To X max , dx is the increment in the x-axis direction, the Y-axis is the north-south direction, and the range is from Y min To Y max dy is the increment in the y-axis direction and the Z-axis is the depth direction. The range is from Z min to Z max , dz is the increment in the z-axis direction, and the number of grids N in the x-axis direction is calculated based on the grid range and the corresponding grid increment. x , the number of grids in the y-axis direction N y and the number of grids N in the z-axis direction z Optionally, in order to more accurately determine the minimum magnitude, after obtaining the seismic source scanning grid, the number of seismic source scanning grids in each direction can be appropriately increased to obtain the final multiple seismic source scanning grids, and each seismic source scanning grid can be sorted and numbered.

[0026] S102, obtaining a preset magnitude scanning interval and magnitude scanning increment, traversing all source scanning grids, and scanning each source scanning grid one by one according to the magnitude scanning interval and magnitude scanning increment, to obtain the magnitude M of the source scanning grid corresponding to the i-th scanning. wi , where i is a natural number greater than or equal to 1.

[0027] It should be noted that the present application does not limit the specific settings of the magnitude scanning interval and the magnitude scanning increment, and they can be set according to actual conditions.

[0028] Optionally, the magnitude scan interval can be set to [-5, 1], where -5 is the start value of the magnitude scan, 1 is the end value of the magnitude scan, and the magnitude scan increment d is w Can be set to 0.1.

[0029] In an embodiment of the present application, by traversing all seismic source scanning grids, each seismic source scanning grid is scanned successively according to the magnitude scanning interval and the magnitude scanning increment, and the magnitude of the seismic source scanning grid corresponding to the i-th scan is obtained.

[0030] For example, for a magnitude scan interval of [-5, 1], the magnitude scan increment d w When it is 0.1, the calculation can be cyclically scanned. First, set the outer loop, and traverse all the source scanning grids through the for loop, for k = 1 to N z , for m=1toN x , for j = 1 to N y , and then the inner loop is performed. Each source scanning grid can be scanned one by one through the for loop to obtain the magnitude of the source scanning grid corresponding to the i-th scan for n = -5 to 1 with d w , then the magnitude of the seismic source scanning grid corresponding to the first scan is -5, the magnitude of the seismic source scanning grid corresponding to the second scan is -5+0.1... and the magnitude of the seismic source scanning grid corresponding to the last scan is 1.

[0031] S103. Determine the seismic moment of the source scanning grid corresponding to the i-th scan according to the magnitude, and determine the amplitude value of the source scanning grid corresponding to the i-th scan according to the seismic moment.

[0032] In the embodiment of the present application, after the magnitude is obtained, the seismic moment of the source scanning grid corresponding to the i-th scanning can be determined using the following formula:

[0033]

[0034] Among them, M wi is the magnitude of the source scanning grid corresponding to the i-th scan, M 0i is the seismic moment of the source scanning grid corresponding to the i-th scan.

[0035] In the embodiment of the present application, after obtaining the seismic moment M of the source scanning grid corresponding to the i-th scanning, 0i Afterwards, the angular frequency of the seismic wave of the source scanning grid corresponding to the ith scan and the reference amplitude of the source spectrum can be determined according to the seismic moment, the frequency factor, velocity and attenuation factor of the seismic wave of the source scanning grid corresponding to the ith scan can be obtained, the distance between the source scanning grid corresponding to the ith scan and the deployed detectors can be obtained, and the amplitude value Ω(fi) of the source scanning grid corresponding to the ith scan can be determined according to the angular frequency, reference amplitude, frequency factor, velocity, attenuation factor and distance.

[0036] S104. In response to the amplitude value of the source scanning grid being greater than or equal to the amplitude threshold, the scanning is stopped, and the magnitude of the source scanning grid corresponding to the i-th scanning is used as the minimum magnitude of the source scanning grid.

[0037] In the embodiment of the present application, the noise amplitude value Ω of the deployed detector can be obtained. nThe product of the noise amplitude and the signal-to-noise ratio (SNR) is used as the amplitude threshold Ω. n ×SNR.

[0038] In the embodiment of the present application, in response to the amplitude value of the source scanning grid being greater than or equal to the amplitude threshold, that is, Ω(fi)≥(Ω n × SNR), the scanning is stopped, and the magnitude of the source scanning grid corresponding to the i-th scanning is taken as the minimum magnitude of the source scanning grid.

[0039] The minimum magnitude of the source scanning grid refers to the magnitude of the smallest earthquake event in the source scanning grid that can be detected by the microseismic monitoring system.

[0040] It should be noted that the amplitude value of the source scanning grid corresponding to the i-th scanning is less than the amplitude threshold, that is, Ω(fi)<(Ω n × SNR), then continue scanning, and according to the magnitude scanning interval and magnitude scanning increment, the magnitude of the source scanning grid corresponding to the i+1th scanning is obtained as M wi +d w , for the i+1th scan, determine the seismic moment of the source scanning grid corresponding to the i+1th scan according to the magnitude, and determine the amplitude value of the source scanning grid corresponding to the i+1th scan according to the seismic moment, continue to judge whether the amplitude value of the source scanning grid corresponding to the i+1th scan is greater than or equal to the amplitude threshold, in response to the amplitude value of the source scanning grid being greater than or equal to the amplitude threshold, stop scanning, and use the magnitude of the source scanning grid corresponding to the i+1th scan as the minimum magnitude of the source scanning grid, if in response to the amplitude value of the source scanning grid corresponding to the i+1th scan being less than the amplitude threshold, repeat the above steps to continue scanning, within the magnitude scanning interval, until the amplitude value of the source scanning grid is greater than or equal to the amplitude threshold, optionally, when the magnitude is the end value of the magnitude scanning interval, in this case, the amplitude value of the source scanning grid is still less than the amplitude threshold, then directly use the maximum value of the magnitude scanning interval as the minimum magnitude of the source scanning grid.

[0041] S105. Sort the minimum magnitude of each earthquake source scanning grid, and determine the minimum magnitude of the monitoring area according to the sorting result.

[0042] In an embodiment of the present application, after obtaining the minimum magnitude of each seismic source scanning grid, the minimum magnitudes of the seismic source scanning grids can be sorted in ascending order, and the minimum magnitude of the seismic source scanning grid ranked first is used as the minimum magnitude of the monitoring area.

[0043] The present application provides a method for determining the minimum magnitude in microseismic monitoring, which obtains a source monitoring area, divides the source monitoring area into grids, obtains a plurality of source scanning grids, obtains a preset magnitude scanning interval and a magnitude scanning increment, traverses all source scanning grids, and scans each source scanning grid one by one according to the magnitude scanning interval and the magnitude scanning increment to obtain the magnitude of the source scanning grid corresponding to the i-th scan, wherein i is a natural number greater than or equal to 1, determines the seismic moment of the source scanning grid corresponding to the i-th scan according to the magnitude, and determines the amplitude value of the source scanning grid corresponding to the i-th scan according to the seismic moment, and responds to the seismic moment. If the amplitude value of the source scanning grid is greater than or equal to the amplitude threshold, the scanning is stopped, and the magnitude of the source scanning grid corresponding to the i-th scan is used as the minimum magnitude of the source scanning grid. The minimum magnitude of each source scanning grid is sorted, and the minimum magnitude of the monitoring area is determined according to the sorting result. By realizing the automatic determination of the minimum magnitude of the monitoring area, the human calculation error is reduced, the efficiency of determining the minimum magnitude of the monitoring area is improved, and the accuracy and reliability of the minimum magnitude are guaranteed. Based on the minimum magnitude, data support can be provided for the design and optimization of the microseismic monitoring system, so that the microseismic monitoring system can achieve the best monitoring effect.

[0044] Figure 3 A schematic flow chart of a method for determining the minimum magnitude in microseismic monitoring provided in an embodiment of the present application.

[0045] like Figure 3 As shown, the method for determining the minimum magnitude in microseismic monitoring proposed in this embodiment specifically includes the following steps:

[0046] S301, obtaining a seismic source monitoring area, dividing the seismic source monitoring area into grids, and obtaining a plurality of seismic source scanning grids.

[0047] S302. Obtain a preset magnitude scanning interval and magnitude scanning increment, traverse all source scanning grids, and scan each source scanning grid successively according to the magnitude scanning interval and the magnitude scanning increment to obtain the magnitude of the source scanning grid corresponding to the i-th scan, where i is a natural number greater than or equal to 1.

[0048] S303. Determine the seismic moment of the source scanning grid corresponding to the i-th scan according to the magnitude.

[0049] The steps S301-S303 may be implemented by any implementation method in the embodiments of the present application and will not be described in detail here.

[0050] S304. Determine the angular frequency of the seismic wave of the source scanning grid corresponding to the i-th scan and the reference amplitude of the source spectrum according to the seismic moment.

[0051] Among them, seismic waves can be longitudinal waves (P waves) and transverse waves (S waves).

[0052] In an embodiment of the present application, the stress change value of the microseismic event can be obtained, and the angular frequency of the seismic wave of the source scanning grid corresponding to the i-th scan can be determined based on the seismic moment, stress change value, velocity and influencing factor.

[0053] For example, the angular frequency of the seismic wave of the source scanning grid corresponding to the i-th scanning can be determined by using the following formula:

[0054]

[0055] Among them, M 0i is the seismic moment of the source scanning grid corresponding to the i-th scan, f 0i is the angular frequency of the seismic wave of the source scanning grid corresponding to the i-th scan, Δσ is the stress change value, V is the velocity of the seismic wave, K c is the impact factor, K c is a constant, which can be 0.37, K c Determined by Brune model.

[0056] In an embodiment of the present application, the stratum density and seismic radiation factor of the source scanning grid corresponding to the i-th scan can be obtained, and the reference amplitude of the source spectrum can be determined according to the seismic moment, stratum density, velocity, seismic radiation factor and distance.

[0057] For example, the following formula may be used to determine the reference amplitude of the source spectrum of the source scanning grid corresponding to the i-th scan:

[0058]

[0059] Among them, M 0i is the seismic moment of the source scanning grid corresponding to the i-th scan, Ω 0i is the reference amplitude of the source spectrum of the source scanning grid corresponding to the i-th scan, ρ is the formation density, R is the seismic radiation factor, and r is the distance between the corresponding source scanning grid and the deployed detector.

[0060] S305 , obtaining the frequency factor, velocity and attenuation factor of the seismic wave of the source scanning grid corresponding to the i-th scanning.

[0061] S306, obtaining the distance between the source scanning grid and the deployed geophones corresponding to the i-th scanning.

[0062] S307. Determine the amplitude value of the source scanning grid corresponding to the i-th scanning according to the angular frequency, reference amplitude, frequency factor, speed, attenuation factor and distance.

[0063] In an embodiment of the present application, after obtaining the angular frequency, reference amplitude, frequency factor, velocity, attenuation factor and distance, the amplitude value of the source scanning grid corresponding to the i-th scan can be determined based on the angular frequency, reference amplitude, frequency factor, velocity, attenuation factor and distance.

[0064] For example, the amplitude value of the source scanning grid corresponding to the i-th scan can be determined using the following formula:

[0065]

[0066] Among them, Ω(fi) is the amplitude value of the source scanning grid corresponding to the i-th scan, Ω 0i is the reference amplitude of the source spectrum of the source scanning grid corresponding to the i-th scan, f 0i is the angular frequency of the seismic wave of the source scanning grid corresponding to the i-th scan, r is the distance, Q is the attenuation factor (the degree of absorption of seismic waves by the stratum), V is the velocity of the seismic wave, is the frequency factor (the ratio between the actual frequency of the seismic wave and the reference frequency).

[0067] S308. In response to the amplitude value of the source scanning grid being greater than or equal to the amplitude threshold, the scanning is stopped, and the magnitude of the source scanning grid corresponding to the i-th scanning is taken as the minimum magnitude.

[0068] S309. Sort the minimum magnitude of each earthquake source scanning grid, and determine the minimum magnitude of the monitoring area according to the sorting result.

[0069] The steps S308-S309 may be implemented in any of the implementation methods in the embodiments of the present application and will not be described in detail here.

[0070] To sum up, the method for determining the minimum magnitude in microseismic monitoring provided in the present application can automatically calculate the minimum magnitude of the monitoring area, reduce the error of manual calculation, and improve the accuracy and efficiency of determining the minimum magnitude in microseismic monitoring. By determining the minimum magnitude of the monitoring area, the layout and parameters of the detectors can be adjusted to ensure that the microseismic monitoring system achieves the best monitoring effect. It can also quantify the minimum detectable magnitude of the microseismic monitoring system in different locations and under different conditions, evaluate the detection capability of the microseismic monitoring system, provide data support for the design and optimization of the microseismic monitoring system, and lay a solid foundation for ensuring safe production in coal mines.

[0071] In order to implement the above embodiment, this embodiment provides a device for determining the minimum magnitude in microseismic monitoring. Figure 4 A schematic diagram of the structure of a device for determining the minimum magnitude in microseismic monitoring provided in an embodiment of the present application.

[0072] like Figure 4As shown, the device 1000 for determining the minimum magnitude in microseismic monitoring includes: a grid division module 110 , a scanning module 120 , a first determination module 130 , a second determination module 140 and a third determination module 150 .

[0073] A grid division module 110 is used to obtain a seismic source monitoring area, and to perform grid division on the seismic source monitoring area to obtain a plurality of seismic source scanning grids;

[0074] The scanning module 120 is used to obtain a preset magnitude scanning interval and a magnitude scanning increment, traverse all source scanning grids, and scan each source scanning grid one by one according to the magnitude scanning interval and the magnitude scanning increment to obtain the magnitude of the source scanning grid corresponding to the i-th scanning, where i is a natural number greater than or equal to 1;

[0075] A first determination module 130 is used to determine the seismic moment of the seismic source scanning grid corresponding to the i-th scan according to the magnitude, and determine the amplitude value of the seismic source scanning grid corresponding to the i-th scan according to the seismic moment;

[0076] The second determination module 140 is used to stop scanning in response to the amplitude value of the seismic source scanning grid being greater than or equal to the amplitude threshold, and to use the magnitude of the seismic source scanning grid corresponding to the i-th scanning as the minimum magnitude of the seismic source scanning grid;

[0077] The third determination module 150 is used to sort the minimum magnitude of each earthquake source scanning grid, and determine the minimum magnitude of the monitoring area according to the sorting result.

[0078] According to an embodiment of the present application, the process of determining the seismic moment of the source scanning grid corresponding to the i-th scanning according to the magnitude includes:

[0079]

[0080] Among them, M wi is the magnitude of the source scanning grid corresponding to the i-th scan, M 0i is the seismic moment of the source scanning grid corresponding to the i-th scan.

[0081] In one embodiment of the present application, the first determination module 130 is further used to: determine the angular frequency of the seismic wave of the source scanning grid corresponding to the i-th scan and the reference amplitude of the source spectrum based on the seismic moment; obtain the frequency factor, velocity and attenuation factor of the seismic wave of the source scanning grid corresponding to the i-th scan; obtain the distance between the source scanning grid corresponding to the i-th scan and the deployed detectors; determine the amplitude value of the source scanning grid corresponding to the i-th scan based on the angular frequency, the reference amplitude, the frequency factor, the velocity, the attenuation factor and the distance.

[0082] In one embodiment of the present application, the first determination module 130 is further used to: obtain the stress change value of the microseismic event; and determine the angular frequency according to the seismic moment, the stress change value, the velocity and the influencing factor.

[0083] In one embodiment of the present application, the first determination module 130 is further used to: obtain the stratigraphic density and seismic radiation factor of the source scanning grid corresponding to the i-th scan; and determine the reference amplitude of the source spectrum according to the seismic moment, the stratigraphic density, the velocity, the seismic radiation factor and the distance.

[0084] In one embodiment of the present application, the process of determining the amplitude threshold includes: acquiring a noise amplitude value and a signal-to-noise ratio of a deployed detector; and taking the product of the noise amplitude value and the signal-to-noise ratio as the amplitude threshold.

[0085] In one embodiment of the present application, the third determination module 150 is further used to: sort the minimum magnitudes of the source scanning grids in ascending order, and use the minimum magnitude of the source scanning grid that is at the first position as the minimum magnitude of the monitoring area.

[0086] The device for determining the minimum magnitude in microseismic monitoring provided by the present application obtains a source monitoring area, divides the source monitoring area into grids, obtains multiple source scanning grids, obtains a preset magnitude scanning interval and a magnitude scanning increment, traverses all source scanning grids, and scans each source scanning grid one by one according to the magnitude scanning interval and the magnitude scanning increment to obtain the magnitude of the source scanning grid corresponding to the i-th scan, wherein i is a natural number greater than or equal to 1, determines the seismic moment of the source scanning grid corresponding to the i-th scan according to the magnitude, and determines the amplitude value of the source scanning grid corresponding to the i-th scan according to the seismic moment, and responds to the seismic moment. If the amplitude value of the source scanning grid is greater than or equal to the amplitude threshold, the scanning is stopped, and the magnitude of the source scanning grid corresponding to the i-th scan is used as the minimum magnitude of the source scanning grid. The minimum magnitude of each source scanning grid is sorted, and the minimum magnitude of the monitoring area is determined according to the sorting result. By realizing the automatic determination of the minimum magnitude of the monitoring area, the human calculation error is reduced, the efficiency of determining the minimum magnitude of the monitoring area is improved, and the accuracy and reliability of the minimum magnitude are guaranteed. Based on the minimum magnitude, data support can be provided for the design and optimization of the microseismic monitoring system, so that the microseismic monitoring system can achieve the best monitoring effect.

[0087] In order to implement the above embodiment, the present application also proposes an electronic device 2000, such as Figure 4As shown, it includes: a memory 210, a processor 220, and a computer program stored in the memory 210 and executable on the processor 220. When the processor executes the program, the method for determining the minimum magnitude in microseismic monitoring as described in the first aspect is implemented.

[0088] In order to implement the above embodiment, the present application proposes a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable the computer to execute the method for determining the minimum magnitude in microseismic monitoring described in the first aspect.

[0089] In order to implement the above embodiments, the present application also proposes a computer program product, including a computer program, which, when executed by a processor, implements the method for determining the minimum magnitude in microseismic monitoring described in the first aspect.

[0090] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this application can be executed in parallel, sequentially or in different orders, as long as the expected results of the technical solution disclosed in this application can be achieved, and this document is not limited here.

[0091] The above specific implementations do not constitute a limitation on the protection scope of this application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included in the protection scope of this application.

Claims

1. A method for determining the minimum magnitude in microseismic monitoring, characterized in that: The method comprises: Acquire a seismic source monitoring area, and divide the seismic source monitoring area into grids to obtain a plurality of seismic source scanning grids; Obtaining a preset magnitude scanning interval and magnitude scanning increment, traversing all source scanning grids, scanning each source scanning grid one by one according to the magnitude scanning interval and the magnitude scanning increment, and obtaining the magnitude of the source scanning grid corresponding to the i-th scanning, where i is a natural number greater than or equal to 1; Determine the seismic moment of the seismic source scanning grid corresponding to the i-th scan according to the magnitude, and determine the amplitude value of the seismic source scanning grid corresponding to the i-th scan according to the seismic moment; In response to the amplitude value of the seismic source scanning grid being greater than or equal to the amplitude threshold, the scanning is stopped, and the magnitude of the seismic source scanning grid corresponding to the i-th scanning is used as the minimum magnitude of the seismic source scanning grid; The minimum magnitude of each earthquake source scanning grid is sorted, and the minimum magnitude of the monitoring area is determined according to the sorting result.

2. The method according to claim 1, characterized in that The process of determining the seismic moment of the source scanning grid corresponding to the i-th scanning according to the magnitude includes: Among them, M wi is the magnitude of the source scanning grid corresponding to the i-th scan, M 0i is the seismic moment of the source scanning grid corresponding to the i-th scan.

3. The method according to claim 1, characterized in that Determining the amplitude value of the source scanning grid corresponding to the i-th scanning according to the seismic moment includes: Determine, according to the seismic moment, the angular frequency of the seismic wave of the seismic source scanning grid corresponding to the i-th scanning and the reference amplitude of the seismic source spectrum; Obtain the frequency factor, velocity and attenuation factor of the seismic wave of the source scanning grid corresponding to the i-th scanning; Obtain the distance between the source scanning grid and the deployed geophones corresponding to the i-th scanning; The amplitude value of the source scanning grid corresponding to the i-th scanning is determined according to the angular frequency, the reference amplitude, the frequency factor, the speed, the attenuation factor and the distance.

4. The method according to claim 3, characterized in that The step of determining the angular frequency of the seismic wave of the source scanning grid corresponding to the i-th scanning according to the seismic moment comprises: Obtain stress change values ​​of microseismic events; The angular frequency is determined according to the seismic moment, the stress change value, the velocity and the influencing factor.

5. The method according to claim 3, characterized in that: The step of determining the reference amplitude of the seismic source spectrum of the seismic source scanning grid corresponding to the i-th scanning according to the seismic moment comprises: Obtaining the stratum density and seismic radiation factor of the source scanning grid corresponding to the i-th scanning; A reference amplitude of the earthquake source spectrum is determined according to the seismic moment, the stratum density, the velocity, the seismic radiation factor and the distance.

6. The method according to claim 1, characterized in that The process of determining the amplitude threshold comprises: Obtain the noise amplitude value and signal-to-noise ratio of the deployed detectors; The product of the noise amplitude value and the signal-to-noise ratio is used as the amplitude threshold.

7. The method according to claim 1, characterized in that The step of sorting the minimum magnitudes of the earthquake source scanning grids and determining the minimum magnitude of the monitoring area according to the sorting result includes: The minimum magnitudes of the seismic source scanning grids are sorted in ascending order, and the minimum magnitude of the seismic source scanning grid that is at the first position is used as the minimum magnitude of the monitoring area.

8. A device for determining the minimum magnitude in microseismic monitoring, characterized in that: The device comprises: A grid division module is used to obtain a seismic source monitoring area, and to perform grid division on the seismic source monitoring area to obtain a plurality of seismic source scanning grids; A scanning module is used to obtain a preset magnitude scanning interval and a magnitude scanning increment, traverse all source scanning grids, and scan each source scanning grid one by one according to the magnitude scanning interval and the magnitude scanning increment to obtain the magnitude of the source scanning grid corresponding to the i-th scanning, where i is a natural number greater than or equal to 1; A first determination module is used to determine the seismic moment of the seismic source scanning grid corresponding to the i-th scan according to the magnitude, and determine the amplitude value of the seismic source scanning grid corresponding to the i-th scan according to the seismic moment; A second determination module is used to stop scanning in response to the amplitude value of the seismic source scanning grid being greater than or equal to an amplitude threshold, and to use the magnitude of the seismic source scanning grid corresponding to the i-th scanning as the minimum magnitude of the seismic source scanning grid; The third determination module is used to sort the minimum magnitude of each earthquake source scanning grid, and determine the minimum magnitude of the monitoring area according to the sorting result.

9. An electronic device, comprising: at least one processor; and a memory communicatively coupled to the at least one processor; The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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