Multi-source monitoring method and device for fracturing of hard roof area

Abstract

The invention provides a hard roof area fracturing multi-source monitoring method and device, and relates to the technical field of geological prospecting, and the method comprises the steps: determining the position of a seismic source according to a micro-seismic waveform record collected by a ground three-component detector; carrying out two-dimensional positioning on a microseismic event waveform acquired by the distributed optical fiber in a seismic source direction to obtain a seismic plane distance and depth; jointly determining the three-dimensional space position of the seismic source according to the three parameters of the seismic source orientation, the seismic plane distance and the depth; and analyzing the diffusion range of the fracturing fluid according to the three-dimensional space position through an electromagnetic method to obtain the diffusion range of the fracturing fluid. And finally, accurate monitoring and evaluation of the diffusion and transformation range of the fracturing fluid during the hydraulic fracturing operation of the hard roof are realized through microseism, distributed optical fiber sensing and electromagnetic method multi-source monitoring.

Description

Technical Field

[0001] The present invention relates to the field of geological exploration technology, and in particular to a method and device for multi-source monitoring of fracturing in a hard roof area. Background Art

[0002] Hydraulic fracturing technology, as an environmentally friendly and efficient means of decompression and weakening, has been rapidly developed in coal mine rock formations in recent years. In this field, crack expansion monitoring and fracturing effect evaluation are key links. At present, microseismic monitoring is the main method for monitoring the dynamic expansion of hydraulic fracturing cracks. However, due to the interference signals of various rock fractures in the mining area, it is still challenging to quickly and accurately identify the development direction and geometric dimensions of the cracks. In addition, the existing fracturing effect evaluation system is not yet fully mature, resulting in insufficient feedback on the optimization of the fracturing design scheme, and the inability to comprehensively and accurately measure the actual effect of fracturing.

[0003] Therefore, how to conduct crack monitoring more effectively has become an urgent problem to be solved in the industry. Summary of the invention

[0004] The present invention provides a multi-source monitoring method and device for fracturing in a hard roof area, which are used to solve the defect of how to more effectively monitor cracks in the prior art.

[0005] The present invention provides a multi-source monitoring method for fracturing in a hard roof area, comprising: Determine the earthquake source location based on the microseismic waveform records collected by the ground three-component geophone; The microseismic event waveform collected by distributed optical fiber is two-dimensionally positioned in the earthquake source azimuth to obtain the distance and depth of the earthquake plane; Determine the three-dimensional spatial position of the earthquake source according to the earthquake source azimuth, the earthquake plane distance and the depth; By using an electromagnetic method, the diffusion range of the fracturing liquid is analyzed according to the three-dimensional spatial position to obtain the diffusion range of the fracturing liquid. According to a multi-source monitoring method for fracturing in a hard roof area provided by the present invention, the diffusion range of the fracturing liquid is analyzed according to the three-dimensional spatial position by using an electromagnetic method to obtain the diffusion range of the fracturing liquid, including: Arranging the electromagnetic receiver and the electromagnetic transmitter array according to the three-dimensional spatial position; Monitor the diffusion of fracturing fluid in rock by exciting and detecting depth-matched electromagnetic wave energy; Dynamically measure changes in the scattered field before, during or after fluid injection, and changes in the electromagnetic field before and after fracturing; An inversion analysis is performed based on the variation of the scattering field and the variation of the electromagnetic field to obtain the diffusion range of the fracturing fluid.

[0006] According to a multi-source monitoring method for fracturing in a hard roof area provided by the present invention, the microseismic event waveform collected by distributed optical fiber is two-dimensionally positioned in the earthquake source azimuth to obtain the distance and depth of the earthquake generating plane, including: Determine the earthquake source location based on the waveform data of microseismic events recorded by the ground three-component geophone; Based on the microseismic event waveform data collected by distributed optical fiber, two-dimensional positioning is performed on the earthquake source azimuth to obtain the distance and depth of the earthquake generating plane.

[0007] According to a multi-source monitoring method for fracturing in a hard roof area provided by the present invention, the source orientation is determined based on the microseismic event waveform data recorded by the ground three-component geophone, including: The ground three-component geophone captures waveform data in three orthogonal directions of microseismic events in the hard roof region; The estimated earthquake source azimuth is calculated using the time difference in the waveform data and the preset wave velocity model; The earthquake source orientation is determined based on the earthquake positioning algorithm and combined with the estimated earthquake source orientation.

[0008] The present invention also provides a multi-source monitoring device for fracturing in a hard roof area, comprising: The first determination module is used to determine the earthquake source azimuth according to the microseismic waveform records collected by the ground three-component detector; The second determination module is used to perform two-dimensional positioning on the microseismic event waveform collected by the distributed optical fiber in the earthquake source direction to obtain the distance and depth of the earthquake generating plane; A third determination module is used to determine the three-dimensional spatial position of the earthquake source according to the earthquake source azimuth, the distance from the earthquake generating plane and the depth; The monitoring module is used to analyze the diffusion range of the fracturing fluid according to the three-dimensional spatial position by electromagnetic method to obtain the diffusion range of the fracturing fluid.

[0009] According to the multi-source monitoring device for fracturing in a hard roof area provided in an embodiment of the present application, the device is also used for: Arranging the electromagnetic receiver and the electromagnetic transmitter array according to the three-dimensional spatial position; Monitor the diffusion of fracturing fluid in rock by exciting and detecting depth-matched electromagnetic wave energy; Dynamically measure changes in the scattered field before, during or after fluid injection, and changes in the electromagnetic field before and after fracturing; An inversion analysis is performed based on the variation of the scattering field and the variation of the electromagnetic field to obtain the diffusion range of the fracturing fluid.

[0010] According to the multi-source monitoring device for fracturing in a hard roof area provided in an embodiment of the present application, the device is also used for: Determine the earthquake source location based on the waveform data of microseismic events recorded by the ground three-component geophone; Based on the microseismic event waveform data collected by distributed optical fiber, two-dimensional positioning is performed on the earthquake source azimuth to obtain the distance and depth of the earthquake generating plane.

[0011] According to the multi-source monitoring device for fracturing in a hard roof area provided in an embodiment of the present application, the device is also used for: The ground three-component geophone captures waveform data in three orthogonal directions of microseismic events in the hard roof region; The estimated earthquake source azimuth is calculated using the time difference in the waveform data and the preset wave velocity model; The earthquake source orientation is determined based on the earthquake positioning algorithm and combined with the estimated earthquake source orientation.

[0012] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the multi-source monitoring method for fracturing in a hard roof area as described above is implemented.

[0013] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the multi-source monitoring method for fracturing in a hard roof area as described in any one of the above is implemented.

[0014] The present invention also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the multi-source monitoring method for fracturing in a hard roof area as described above is implemented.

[0015] The multi-source monitoring method and device for fracturing in a hard roof area provided by the present invention can capture the vibration of seismic waves in three orthogonal directions, namely two horizontal directions and one vertical direction, through the detector, and provide comprehensive waveform data. The data obtained from the three-component detector and the DAS system are integrated to improve the accuracy of positioning, and the precise location of the earthquake source in three-dimensional space is provided, which is essential for understanding the distribution and expansion of cracks. In addition, through electromagnetic monitoring, the diffusion range of the fracturing fluid in the fracture network can be analyzed and determined, and the accuracy of the fracturing effect evaluation can be improved through the multi-source monitoring method, and dynamic feedback can be quickly performed to continuously optimize the fracturing design and guide the on-site fracturing operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of a multi-source monitoring method for fracturing in a hard roof area provided in an embodiment of the present application; Figure 2 A schematic diagram of multi-source monitoring of fracturing in a hard roof area described in an embodiment of the present application; Figure 3 This is a schematic diagram of multi-source monitoring results of actual hard roof area fracturing in an embodiment of the present application; Figure 4 A schematic diagram of the structure of a multi-source monitoring device for fracturing in a hard roof area provided in an embodiment of the present application; Figure 5 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Among the related technologies, the traditional single microseismic monitoring technology has certain limitations in fracture monitoring. This technology often has difficulty in ensuring sufficient accuracy, especially when distinguishing between fractures with fluid injection (fluid-injected fractures) and fractures without fluid injection (non-fluid-injected fractures). In addition, it is also unable to quickly answer the key question about the fluid migration path, that is, "Where does the water flow?". Currently, one of the main challenges facing microseismic monitoring is that the collected signals are mixed with a large number of non-fracturing events, such as rock fracture events caused by mining operations, drilling activities, or fractures in overlying rock formations. These events are intertwined with microseismic events triggered by hydraulic fracturing, making them difficult to accurately distinguish, thereby increasing the risk of misjudgment.

[0020] In particular, stress disturbance events caused by a large number of fracturing activities often interfere with the interpretation of microseismic fracture networks, resulting in deviations in event determination by existing microseismic systems. This deviation may lead to significant differences between the positioning results and the actual fracture network, which in turn affects the scientific assessment of the extent of fracture extension and the dynamic adjustment of the fracturing design. Therefore, there is a certain degree of blindness in the fracturing design process, and "underpressure" or "overpressure" may occur, which not only affects the fracturing effect but also may bring safety risks. In order to overcome these challenges, more advanced multi-source monitoring technologies are needed to improve the monitoring accuracy and the accuracy of fracture identification.

[0021] Figure 1A schematic diagram of a multi-source monitoring method for fracturing in a hard roof region provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, including: Step 110, determining the earthquake source azimuth according to the microseismic waveform records collected by the ground three-component geophone; Step 120, performing two-dimensional positioning on the microseismic event waveform collected by the distributed optical fiber in the earthquake source azimuth to obtain the distance and depth of the earthquake generating plane; In the embodiment of the present application, the ground three-component detector is capable of capturing the vibration of seismic waves in three orthogonal directions (two horizontal directions and one vertical direction), and providing comprehensive waveform data.

[0022] More specifically, continuous monitoring of seismic waves along the line through optical fiber enables high-density spatial sampling, which helps capture subtle seismic activity.

[0023] By analyzing waveform data in different directions, the source direction of the microseismic event, that is, the direction of the earthquake source, is determined. Use DAS data for two-dimensional positioning to determine the position (distance and depth) of the microseismic event on the plane. Combined with the earthquake source direction, plane distance and depth data, the position of the microseismic event in three-dimensional space is determined through a three-dimensional positioning algorithm.

[0024] Step 130, determining the three-dimensional spatial position of the earthquake source according to the earthquake source azimuth, the distance from the earthquake generating plane and the depth; In the embodiment of the present application, the data obtained from the three-component detector and the DAS system are integrated to improve the accuracy of positioning.

[0025] Apply 3D positioning algorithms, such as the least squares method and Kalman filter, to calculate the 3D coordinates of the earthquake source by combining the earthquake source azimuth, plane distance and depth data. Through an iterative optimization process, adjust the earthquake source parameters until the difference between the observed data and the model predicted data is minimized.

[0026] Step 140: analyzing the diffusion range of the fracturing liquid according to the three-dimensional spatial position by electromagnetic method to obtain the diffusion range of the fracturing liquid.

[0027] In an embodiment of the present application, receiver and transmitter arrays are arranged on the ground to excite and detect depth-matched electromagnetic wave energy.

[0028] Dynamically measure the change in the scattered field before, during or after fluid injection, and record the change in the electromagnetic field before and after fracturing. Use the inversion algorithm to process the electromagnetic monitoring data to characterize the diffusion range of the fracturing fluid. The electromagnetic method can be used to monitor, analyze and determine the diffusion range of the fracturing fluid in the fracture network, which is of great significance for evaluating the effect of hydraulic fracturing and optimizing fracturing design.

[0029] In the embodiment of the present application, the detector can capture the vibration of seismic waves in three orthogonal directions, namely two horizontal directions and one vertical direction, and provide comprehensive waveform data. The data obtained from the three-component detector and the DAS system are integrated to improve the accuracy of positioning, and the precise location of the earthquake source in three-dimensional space is provided, which is essential for understanding the distribution and expansion of cracks. In addition, through electromagnetic monitoring, the diffusion range of the fracturing fluid in the fracture network can be analyzed and determined, and the accuracy of the fracturing effect evaluation can be improved through multi-source monitoring methods, and dynamic feedback can be quickly performed to continuously optimize the fracturing design and guide the on-site fracturing operation.

[0030] Optionally, the fracturing liquid diffusion range is analyzed according to the three-dimensional spatial position by electromagnetic method to obtain the fracturing liquid diffusion range, including: Arranging the electromagnetic receiver and the electromagnetic transmitter array according to the three-dimensional spatial position; Monitor the diffusion of fracturing fluid in rock by exciting and detecting depth-matched electromagnetic wave energy; Dynamically measure changes in the scattered field before, during or after fluid injection, and changes in the electromagnetic field before and after fracturing; An inversion analysis is performed based on the variation of the scattering field and the variation of the electromagnetic field to obtain the diffusion range of the fracturing fluid.

[0031] In the embodiment of the present application, an array of electromagnetic receivers and transmitters is designed and arranged according to the known three-dimensional spatial position. The layout of the array should cover the expected fracturing area to ensure comprehensive monitoring. The electromagnetic receivers and transmitters are installed on the surface or underground to ensure the correct positioning and function of the equipment.

[0032] In the embodiment of the present application, electromagnetic waves of a specific frequency are excited by an electromagnetic transmitter, and these waves will propagate in underground rocks and fluids. Electromagnetic receivers capture reflected and scattered electromagnetic wave signals, which carry information about the characteristics of underground media. By exciting and detecting electromagnetic waves, the electromagnetic characteristics of rocks and fluids in the fracturing area can be obtained, providing data for analyzing the diffusion of fracturing fluids.

[0033] In the embodiments of the present application, the changes of the scattered field are dynamically monitored before, during and after the fluid injection, and these changes reflect the interaction between the fracturing fluid and the rock.

[0034] The changes in the electromagnetic field before and after fracturing are measured, and these changes are directly related to the diffusion of the fracturing fluid. Dynamic measurements provide real-time data on changes in rock physical properties during fracturing, which helps to evaluate the diffusion of fracturing fluids.

[0035] In the embodiment of the present application, the collected electromagnetic wave data is pre-processed, including filtering, denoising and signal enhancement, and inversion algorithms such as time inversion and forward simulation are applied to process the data and establish a model to infer the diffusion range of the fracturing fluid. Based on the results of the inversion analysis, the diffusion path and range of the fracturing fluid in the rock are explained.

[0036] The simulation analysis provides a detailed picture of fracturing fluid diffusion, which is crucial for optimizing fracturing design and improving resource extraction efficiency.

[0037] Optionally, the determining of the earthquake source azimuth, distance from the earthquake generating plane and depth based on the microseismic event waveform data collected by the ground three-component geophone and the distributed optical fiber includes: Determine the earthquake source location based on the waveform data of microseismic events recorded by the ground three-component geophone; Based on the microseismic event waveform data collected by distributed optical fiber, two-dimensional positioning is performed on the earthquake source azimuth to obtain the distance and depth of the earthquake generating plane.

[0038] In the embodiment of the present application, ground three-component geophones are used to record the waveform data of microseismic events. These geophones can capture the movement of seismic waves in three orthogonal directions (two horizontal directions and one vertical direction).

[0039] The data are collected to ensure that enough time windows are covered to capture all phases of seismic waves. The collected waveform data are pre-processed, including filtering, denoising and signal enhancement, to improve data quality.

[0040] Feature extraction, such as the arrival time, amplitude and frequency of seismic waves. The time difference between the arrival of seismic waves at different detectors (the arrival time difference between P waves and S waves) is used in combination with the known seismic wave velocity model to calculate the direction of the earthquake source. Earthquake location algorithms, such as multilateral location or wavefront location, are used to determine the direction of the earthquake source.

[0041] The waveform data of microseismic events are collected using a distributed optical fiber (DAS) system. DAS technology continuously monitors seismic waves along the optical fiber line to achieve high-density spatial sampling.

[0042] Preprocessing of the data collected by DAS, including filtering, denoising and signal enhancement. Feature extraction, such as the arrival time, amplitude and frequency of seismic waves.

[0043] Based on the known location of the earthquake source, DAS data is used for two-dimensional positioning. This step involves techniques such as waveform fitting, wave velocity modeling, and travel time calculation. By analyzing the arrival time and propagation speed of seismic waves at different locations, the plane distance and depth of the earthquake source can be determined.

[0044] Figure 2This is a schematic diagram of multi-source monitoring of fracturing in a hard roof area described in an embodiment of the present application. Figure 3 This is a schematic diagram of the multi-source monitoring results of the actual hard roof regional fracturing in the embodiment of this application. Through the multi-source detection method, it is possible to quickly monitor dry and wet cracks during the hydraulic fracturing operation of the hard roof and display the fluid diffusion path and expansion range, and dynamically feedback the design and correction of the fracturing plan. During the hydraulic fracturing operation, after each fracturing section, the fracture network distribution and the diffusion range of the fracturing fluid are quickly given within 30 minutes, and guidance opinions are provided for the design of the next fracturing plan to avoid "overpressure" or "underpressure" and achieve full transformation of the roof by regional fracturing.

[0045] The multi-source monitoring device for fracturing in a hard roof region provided by the present invention is described below. The multi-source monitoring device for fracturing in a hard roof region described below and the multi-source monitoring method for fracturing in a hard roof region described above can be referred to each other.

[0046] Figure 4 A schematic diagram of the structure of a multi-source monitoring device for fracturing in a hard roof area provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, including: The first determination module 410 is used to determine the earthquake source azimuth according to the microseismic waveform records collected by the ground three-component detector; The second determination module 420 is used to perform two-dimensional positioning on the microseismic event waveform collected by the distributed optical fiber in the earthquake source azimuth to obtain the distance and depth of the earthquake generating plane; The third determination module 430 is used to determine the three-dimensional spatial position of the earthquake source according to the earthquake source azimuth, the earthquake plane distance and the depth; The monitoring module 440 is used to analyze the diffusion range of the fracturing fluid according to the three-dimensional spatial position by electromagnetic method to obtain the diffusion range of the fracturing fluid.

[0047] Optionally, the device is also used for: Arranging the electromagnetic receiver and the electromagnetic transmitter array according to the three-dimensional spatial position; Monitor the diffusion of fracturing fluid in rock by exciting and detecting depth-matched electromagnetic wave energy; Dynamically measure changes in the scattered field before, during or after fluid injection, and changes in the electromagnetic field before and after fracturing; An inversion analysis is performed based on the variation of the scattering field and the variation of the electromagnetic field to obtain the diffusion range of the fracturing fluid.

[0048] Optionally, the device is also used for: Determine the earthquake source location based on the waveform data of microseismic events recorded by the ground three-component geophone; Based on the microseismic event waveform data collected by distributed optical fiber, two-dimensional positioning is performed on the earthquake source azimuth to obtain the distance and depth of the earthquake generating plane.

[0049] In the embodiment of the present application, the detector can capture the vibration of seismic waves in three orthogonal directions, namely two horizontal directions and one vertical direction, and provide comprehensive waveform data. The data obtained from the three-component detector and the DAS system are integrated to improve the accuracy of positioning, and the precise location of the earthquake source in three-dimensional space is provided, which is essential for understanding the distribution and expansion of cracks. In addition, through electromagnetic monitoring, the diffusion range of the fracturing fluid in the fracture network can be analyzed and determined, and the accuracy of the fracturing effect evaluation can be improved through multi-source monitoring methods, and dynamic feedback can be quickly performed to continuously optimize the fracturing design and guide the on-site fracturing operation.

[0050] Figure 5 is a schematic diagram of the structure of the electronic device provided by the present invention, such as Figure 5 As shown, the electronic device may include: a processor 510, a communication interface 520, a memory 530 and a communication bus 540, wherein the processor 510, the communication interface 520 and the memory 530 communicate with each other through the communication bus 540. The processor 510 may call the logic instructions in the memory 530 to execute the multi-source monitoring method for fracturing in a hard roof area, the method comprising: determining the earthquake source azimuth according to the microseismic waveform records collected by the ground three-component detector; performing two-dimensional positioning on the earthquake source azimuth for the microseismic event waveform collected by the distributed optical fiber to obtain the distance and depth of the earthquake plane; determining the three-dimensional spatial position of the earthquake source according to the earthquake source azimuth, the distance and depth of the earthquake plane; and performing the analysis of the diffusion range of the fracturing liquid according to the three-dimensional spatial position by the electromagnetic method to obtain the diffusion range of the fracturing liquid.

[0051] In addition, the logic instructions in the above-mentioned memory 530 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0052] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the multi-source monitoring method for fracturing in a hard roof area provided by the above-mentioned methods, the method including: determining the source orientation based on the microseismic waveform records collected by the ground three-component detector; performing two-dimensional positioning on the microseismic event waveforms collected by the distributed optical fiber at the source orientation to obtain the distance and depth of the seismic plane; determining the three-dimensional spatial position of the source based on the source orientation, the distance and depth of the seismic plane; and analyzing the diffusion range of the fracturing liquid based on the three-dimensional spatial position by electromagnetic method to obtain the diffusion range of the fracturing liquid.

[0053] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the multi-source monitoring method for fracturing in a hard roof area provided by the above-mentioned methods, the method comprising: determining the earthquake source orientation based on the microseismic waveform records collected by a ground three-component detector; performing two-dimensional positioning of the microseismic event waveforms collected by distributed optical fibers at the earthquake source orientation to obtain the earthquake plane distance and depth; determining the three-dimensional spatial position of the earthquake source based on the earthquake source orientation, the earthquake plane distance and the depth; and performing a fracturing liquid diffusion range analysis based on the three-dimensional spatial position by an electromagnetic method to obtain the fracturing liquid diffusion range.

[0054] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0055] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-source monitoring method for fracturing in a hard roof area, characterized in that: include: Determine the earthquake source location based on the microseismic waveform records collected by the ground three-component geophone; The microseismic event waveform collected by distributed optical fiber is two-dimensionally positioned in the earthquake source azimuth to obtain the distance and depth of the earthquake plane; Determine the three-dimensional spatial position of the earthquake source according to the earthquake source azimuth, the earthquake plane distance and the depth; The diffusion range of the fracturing liquid is analyzed according to the three-dimensional spatial position by electromagnetic method to obtain the diffusion range of the fracturing liquid.

2. The multi-source monitoring method for fracturing in a hard roof area according to claim 1, characterized in that: The fracturing liquid diffusion range is analyzed according to the three-dimensional spatial position by electromagnetic method to obtain the fracturing liquid diffusion range, including: Arranging the electromagnetic receiver and the electromagnetic transmitter array according to the three-dimensional spatial position; Monitor the diffusion of fracturing fluid in rock by exciting and detecting depth-matched electromagnetic wave energy; Dynamically measure changes in the scattered field before, during or after fluid injection, and changes in the electromagnetic field before and after fracturing; An inversion analysis is performed based on the variation of the scattering field and the variation of the electromagnetic field to obtain the diffusion range of the fracturing fluid.

3. The multi-source monitoring method for fracturing in a hard roof area according to claim 1, characterized in that: The two-dimensional positioning of the microseismic event waveform collected by the distributed optical fiber in the earthquake source azimuth to obtain the distance and depth of the earthquake generating plane includes: Determine the earthquake source location based on the waveform data of microseismic events recorded by the ground three-component geophone; Based on the microseismic event waveform data collected by distributed optical fiber, two-dimensional positioning is performed on the earthquake source azimuth to obtain the distance and depth of the earthquake generating plane.

4. The multi-source monitoring method for fracturing in a hard roof area according to claim 3 is characterized in that: The method of determining the earthquake source azimuth according to the microseismic event waveform data recorded by the ground three-component geophone comprises: The ground three-component geophone captures waveform data in three orthogonal directions of microseismic events in the hard roof region; The estimated earthquake source azimuth is calculated using the time difference in the waveform data and the preset wave velocity model; The earthquake source orientation is determined based on the earthquake positioning algorithm and combined with the estimated earthquake source orientation.

5. A multi-source monitoring device for fracturing in a hard roof area, characterized in that: include: The first determination module is used to determine the earthquake source azimuth according to the microseismic waveform records collected by the ground three-component detector; The second determination module is used to perform two-dimensional positioning on the microseismic event waveform collected by the distributed optical fiber in the earthquake source direction to obtain the distance and depth of the earthquake generating plane; A third determination module is used to determine the three-dimensional spatial position of the earthquake source according to the earthquake source azimuth, the distance from the earthquake generating plane and the depth; The monitoring module is used to analyze the diffusion range of the fracturing fluid according to the three-dimensional spatial position by electromagnetic method to obtain the diffusion range of the fracturing fluid.

6. The multi-source monitoring device for fracturing in a hard roof area according to claim 5, characterized in that: The device is also used for: Arranging the electromagnetic receiver and the electromagnetic transmitter array according to the three-dimensional spatial position; Monitor the diffusion of fracturing fluid in rock by exciting and detecting depth-matched electromagnetic wave energy; Dynamically measure changes in the scattered field before, during or after fluid injection, and changes in the electromagnetic field before and after fracturing; An inversion analysis is performed based on the variation of the scattering field and the variation of the electromagnetic field to obtain the diffusion range of the fracturing fluid.

7. The multi-source monitoring device for fracturing in a hard roof area according to claim 5, characterized in that: The device is also used for: Determine the earthquake source location based on the waveform data of microseismic events recorded by the ground three-component geophone; Based on the microseismic event waveform data collected by distributed optical fiber, two-dimensional positioning is performed on the earthquake source azimuth to obtain the distance and depth of the earthquake generating plane.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the multi-source monitoring method for fracturing in a hard roof area as claimed in any one of claims 1 to 4 is implemented.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the multi-source monitoring method for fracturing in a hard roof area as claimed in any one of claims 1 to 4 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the multi-source monitoring method for fracturing in a hard roof area as claimed in any one of claims 1 to 4 is implemented.

Images