Shallow gas storage injection-production and ground vibration double-disturbance stability evaluation method and equipment and storage medium

Abstract

The invention discloses a shallow gas storage injection-production and ground vibration double-disturbance stability evaluation method and device and a storage medium. The method specifically comprises the following steps: establishing a gas storage injection-production and ground vibration double-disturbance risk area refined geomechanical model; establishing a gas storage risk area numerical simulation and prediction model; establishing a gas storage stability monitoring system under disturbance; establishing a gas storage double-disturbance stability comprehensive dynamic evaluation system; on the basis of a refined geomechanical model of a gas storage risk area, a numerical simulation prediction model and a monitoring system are combined, corresponding simulation result evaluation standards and monitoring result evaluation standards are established respectively, and stability safety evaluation of a target gas storage is achieved. Related personnel can be reminded to take adjustment measures in time, and safe operation of the gas storage is ensured. According to the method, the vacancy of a gas storage stability evaluation system under the influence of double disturbances at present can be made up, and the effect of safety control of gas storage operation can be well achieved.

Description

Technical Field

[0001] This invention belongs to the field of safety evaluation of underground gas storage facilities, specifically involving a method for evaluating the stability of shallow gas storage facilities under dual disturbances of injection and production and ground vibration. Background Technology

[0002] In recent years, my country's natural gas industry has developed rapidly. In 2021, the dependence on imported natural gas reached 45%. A severe imbalance exists between upstream and downstream natural gas supply and demand, posing a significant challenge to peak shaving and supply assurance. To prevent and mitigate major risks to natural gas supply and demand, the construction of underground gas storage facilities has become an inevitable choice. However, during the operation of these storage facilities, repeated gas injection and extraction, as well as external engineering disturbances (such as tunnel blasting and train vibrations), will cause changes in ground stress. This can lead to a series of elastic deformations in the storage facility's enclosure stability and surrounding faults, potentially exceeding the limits of its capacity, resulting in deformation, failure, and gas leakage, posing significant safety hazards to the storage facility and surrounding areas. These problems encountered during the operation of underground gas storage facilities have become a major factor hindering their widespread adoption.

[0003] To minimize or avoid the aforementioned risks, scholars both domestically and internationally have conducted extensive research. Currently, the methods for assessing the safety impact of gas storage facilities' own circulation injection and production processes, as well as external engineering disturbances, mainly utilize on-site measurements, laboratory experiments, theoretical analysis, and numerical simulations. These methods assess the safety of gas storage facility trap stability, fault slip, and leakage based on monitoring data or simulation results. However, most studies on the safety assessment of gas storage facilities under these disturbances focus only on a single disturbance source or use a single assessment method, which has significant limitations in practical applications.

[0004] Therefore, there is an urgent need to establish a comprehensive evaluation method for the stability of gas storage facilities that considers the dual disturbance sources of gas storage cyclic injection and production and ground vibration, and combines numerical simulation and real-time monitoring technologies. Summary of the Invention

[0005] This invention combines geomechanical models, numerical simulation prediction, and real-time monitoring evaluation methods, focusing on the dual disturbance sources of gas storage cell internal circulation and ground vibration. It can simulate, monitor, and evaluate the stability of gas storage cells under these dual disturbances. The evaluation results can promptly alert relevant personnel to take adjustment measures to ensure the safe operation of the gas storage cell. This invention fills the gap in the current stability evaluation system for gas storage cells under dual disturbances and can effectively achieve the goal of safe operation management of gas storage cells.

[0006] To address the shortcomings of existing gas storage disturbance evaluation methods, the purpose of this invention is to provide a method for evaluating the stability of shallow gas storage facilities under dual disturbances of injection / production and ground vibration. This method utilizes simulation prediction combined with surface and subsurface monitoring to achieve a comprehensive evaluation of the stability of the gas storage facility under the influence of these two disturbances. The technical solution provided by this invention to solve the above-mentioned technical problems is as follows: This invention provides a method for evaluating the stability of shallow gas storage facilities under dual disturbances of injection / production and ground vibration, comprising:

[0007] Step S1: Establish a refined geomechanical model of the risk zone for dual disturbances of gas storage injection and production and ground vibration.

[0008] First, basic data on the target gas storage facility and its two disturbance sources were collected. Second, based on this data, the risk areas of the gas storage facility under the influence of the two disturbance sources—namely, the gas storage facility's own geomechanical characteristics, the characteristics of the gas storage facility's injection and production processes and ground vibrations, and the geomechanical characteristics of the gas storage facility under the influence of these two disturbances—were determined. Finally, a refined three-dimensional geomechanical model was constructed for the gas storage facility's two-disturbance risk areas.

[0009] Step S2: Guided by the refined geomechanical model in Step S1, establish a numerical simulation prediction model for the risk zone of the gas storage facility.

[0010] Guided by a refined geomechanical model of the gas storage risk zone under dual disturbances, a numerical simulation and prediction model for the stability of the gas storage risk zone under the dual disturbances of gas injection and production and ground vibration is established. The model simulates and predicts the stability of the gas storage risk zone, and the stability of the gas storage risk zone is predicted based on the numerical simulation results.

[0011] Step S3: Based on the refined geomechanical model in Step S1, establish a stability monitoring system for the gas storage facility under disturbance.

[0012] Based on a refined geomechanical model of the dual-disturbance risk zone of the gas storage facility, the dual-disturbance risk zone is designated as the key monitoring area, while other areas are designated as normal monitoring areas. The monitoring accuracy of equipment in the key monitoring area is higher than that in the normal monitoring areas. According to the required monitoring content, suitable monitoring methods are selected, and a real-time monitoring system combining surface and underground monitoring is established to monitor the stability of the gas storage facility.

[0013] Step S4: Guided by the refined geomechanical model in Step S1, the numerical simulation prediction model in Step S2, and the gas storage stability monitoring system in Step S3, establish a comprehensive dynamic evaluation system for the stability of the gas storage under dual disturbances.

[0014] Based on the refined geomechanical model of the risk zone of the gas storage facility, the numerical simulation prediction model is combined with the monitoring system, and corresponding evaluation standards for simulation results and monitoring results are established to achieve the stability and safety evaluation of the target gas storage facility.

[0015] Preferably, in step S1:

[0016] The two disturbance sources are the gas storage cyclic injection and production disturbance source and the ground vibration disturbance source. The basic data of the target gas storage and disturbance source include: geological background data, geological exploration data, 3D seismic exploration data, construction data of the target gas storage, construction data of injection wells and production wells, basic parameters of gas storage cyclic injection and production, and engineering parameters such as the area, size, energy and pattern of ground vibration disturbance.

[0017] Based on the fundamental data of the target gas storage facility and disturbance sources, this study conducts a preliminary analysis of the gas storage facility's geographical location and structural characteristics, including reservoir, caprock, structural features, traps, fault characteristics, trap sealing performance, cyclic injection-production characteristics, and surface vibration characteristics. Further analysis of the spatial relationships between the gas storage facility, cyclic injection-production wells, surface vibrations, and faults helps identify risk areas and other regions, preparing for the subsequent establishment of a geomechanical model. The risk areas are primarily fault zones prone to damage under the influence of dual disturbances; all other areas are considered "other" regions.

[0018] Based on the basic data of the gas storage facility and disturbance sources, and defining the boundaries of the divided risk areas, a refined geomechanical model of the dual-disturbance risk zone of the gas storage facility is established using engineering scale as the standard.

[0019] Preferably, in step S2:

[0020] The numerical simulation prediction model is based on the refined geomechanical model of the risk zone established in step S1. Specific simulation parameters are imported from actual data on the gas storage facility and disturbance sources, including relevant formation parameters, reservoir parameters, cyclic injection and production parameters, and ground vibration operation parameters. A suitable mechanical model is selected, and boundary conditions conforming to specifications are set. The simulation prediction content is: under the premise that the cyclic injection and production parameters of the gas storage facility and the ground vibration engineering parameters are set to maximum intensity, the fault slip deformation and ground subsidence within the risk zone of the gas storage facility.

[0021] Preferably, in step S3:

[0022] The dual-disturbance risk area of ​​the gas storage facility is designated as a key monitoring area, and the instruments and equipment used in the monitoring process must be of higher precision than those used in normal monitoring areas. Monitoring content includes: ground vibration, fault disturbance, and natural gas leakage. A real-time monitoring mode combining surface and underground monitoring is implemented. Microseismic monitoring technology is used to monitor ground vibration caused by disturbance sources and fault disturbance within the monitoring area, while internal temperature and pressure monitoring technology is used to monitor natural gas leakage in the gas storage facility.

[0023] Based on the monitoring content and methods, a monitoring system integrating monitoring, feedback, and analysis functions has been formed. Specifically, the monitored data can be fed back to the monitoring personnel in real time, and then the monitoring data can be analyzed to prepare for subsequent safety assessments.

[0024] Preferably, the evaluation criteria for simulation and monitoring in step S4 are as follows:

[0025] In the numerical simulation prediction model, fault slip, plastic deformation, and ground settlement are used as evaluation indicators. The threshold of each indicator is determined by using existing technical standards and combining them with the actual engineering situation. The evaluation is carried out by comparing the simulation results with the threshold values.

[0026] The monitoring system uses the number of seismic events detected by microseismic technology, as well as the magnitude of temperature and pressure inside the gas storage facility, as evaluation indicators. Thresholds are set for the distribution of seismic events in both fault zones and surface areas. When the number of seismic events in a region exceeds this threshold, it indicates that disturbance and instability have occurred in that region. Similarly, thresholds are also set for the changes in temperature and pressure inside the gas storage facility, and evaluation is performed by comparing the monitored values ​​with these thresholds.

[0027] If any of the above indicators exceeds the threshold, it indicates that there is a risk to the stability of the gas storage facility, and a specific evaluation and analysis is required.

[0028] Preferably, the specific evaluation method in step S4 is as follows:

[0029] ① When the numerical simulation results do not exceed the threshold, observe the monitoring results. If the monitoring results also do not exceed the threshold, the stability evaluation of the gas storage facility is safe and no measures need to be taken.

[0030] ② When the numerical simulation results do not exceed the threshold, observe the monitoring results. If the monitoring results exceed the threshold, the effectiveness of the monitoring equipment should be checked and monitoring should be repeated. If the monitoring results still exceed the threshold, it means that there is a danger to the stability of the gas storage facility, and corresponding measures should be taken in time. Otherwise, it is safe.

[0031] ③ When the numerical simulation results exceed the threshold, observe the monitoring results. If the monitoring results also exceed the threshold, the stability of the gas storage facility is extremely dangerous, and corresponding measures should be taken immediately.

[0032] ④ When the numerical simulation result exceeds the threshold, observe the monitoring results. If the monitoring result does not exceed the threshold, the accuracy of the numerical simulation prediction model should be checked. If the simulation result still exceeds the threshold after the check, the stability of the gas storage facility is at risk, and corresponding measures should be taken in time. Otherwise, it is safe.

[0033] ⑤ When the evaluation result is dangerous, the gas storage facility should be safely operated by adjusting and optimizing the cyclic injection and production parameters and reducing ground vibration in a timely manner.

[0034] Preferably, the dynamic evaluation system in step S4 is embodied in:

[0035] Numerical simulation prediction and the monitoring system have a mutual verification relationship. The monitoring system can verify the accuracy of numerical simulation prediction, while numerical simulation can verify the applicability of the monitoring system and the effectiveness of the monitoring equipment. Furthermore, when the monitoring system detects anomalies in areas other than the risk zone, the monitoring results can be fed back to step S1 to expand the risk zone of the gas storage facility. This leads to the expansion of the three-dimensional refined geomechanical model. Based on the newly established geomechanical model, numerical simulation and key monitoring are conducted on the newly added risk zone to achieve the goal of dynamically evaluating the stability of the gas storage facility.

[0036] The present invention also provides a computer device, including a processor and a memory, wherein the memory stores a computer program, and the processor executes the computer program to implement the above-described method.

[0037] The present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-described method.

[0038] This invention provides a method for evaluating the stability of shallow gas storage facilities under dual disturbances of injection / production and ground vibration. It can simulate, monitor, and evaluate the stability of gas storage facilities under the influence of cyclic injection / production and ground vibration. The evaluation results can promptly alert relevant personnel to take adjustment measures to ensure the safe operation of the gas storage facility. This invention fills the gap in the current stability evaluation system for gas storage facilities under dual disturbances and can better achieve the effect of safe operation management of gas storage facilities. Attached Figure Description

[0039] Figure 1 This is a flowchart of the method of the present invention;

[0040] Figure 2 This is a schematic diagram illustrating the dual disturbance effects of the gas storage facility described in this invention. Detailed Implementation

[0041] The present invention will be further described in detail below with reference to embodiments and specific implementation methods. However, this should not be construed as limiting the scope of the above-described subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0042] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0043] like Figure 1 As shown, the stability evaluation method for shallow gas storage facilities under dual disturbances of injection / production and ground vibration proposed in this invention includes the following steps:

[0044] Step S1: Establish a refined geomechanical model of the risk zone for dual disturbances of gas storage injection and production and ground vibration.

[0045] Collect basic data on the target gas storage facility and the dual disturbance sources, including geological background data, geological exploration data, 3D seismic exploration data, construction data, construction data of injection wells and production wells, basic parameters of gas storage facility cycle injection and production, and engineering parameters such as the area, size, energy, and pattern of ground vibration disturbance.

[0046] Secondly, based on the basic data, a preliminary analysis was conducted on the geographical location and structural characteristics of the gas storage facility, including the reservoir, caprock, structure, trap, and fault features, the sealing performance of the trap, the cyclic injection-production characteristics, and surface vibration characteristics. Further analysis was performed on the spatial relationships between the gas storage facility, cyclic injection-production wells, surface vibration, and faults to determine the risk area and other areas of the gas storage facility under the influence of dual disturbance sources. The risk area is primarily the fault zone prone to damage under the influence of dual disturbances; all other areas are considered "other" areas.

[0047] Finally, based on the basic data of the gas storage facility and disturbance sources, the boundaries of the divided risk areas were defined, and a three-dimensional refined geomechanical model of the dual-disturbance risk zone of the gas storage facility was established using engineering scale as the standard.

[0048] Based on the monitoring results of the monitoring system, when anomalies are detected in other areas, the risk areas of the gas storage facility and the three-dimensional refined geomechanical model can be updated and expanded, and then the newly added risk areas can be subject to subsequent numerical simulation and key monitoring.

[0049] Step S2: Guided by the refined geomechanical model in Step S1, establish a numerical simulation prediction model for the risk zone of the gas storage facility.

[0050] The numerical simulation prediction model is based on the refined geomechanical model of the risk area established in step S1. Specific simulation parameters are imported according to the actual data of the gas storage and disturbance source, including relevant formation parameters, reservoir parameters, cyclic injection and production parameters, and ground vibration operation parameters. A suitable mechanical model is selected, and boundary conditions that meet the specifications are set to establish a numerical simulation prediction model for the stability of the gas storage risk area under the dual disturbance of gas storage injection and production and ground vibration, so as to simulate and predict the stability of the gas storage risk area.

[0051] The simulation predicts the fault slip deformation and ground subsidence within the risk zone of the gas storage facility, assuming the gas storage facility's cyclic injection and production and the ground vibration engineering parameters are set to maximum intensity.

[0052] For example, in Figure 2 In the schematic diagram of the dual disturbance of the gas storage facility, the underground disturbance source is the cyclic injection and production of the gas storage injection and production wells, and the ground vibration source is the running train. The red waveform represents the disturbance response of the disturbance source to the surrounding area. The key contents of the simulation and prediction are the slippage of the red fault and the surface subsidence, which serve as important indicators for judging whether the gas storage facility is unstable.

[0053] Step S3: Based on the refined geomechanical model in Step S1, establish a stability monitoring system for the gas storage facility under disturbance.

[0054] Based on a refined geomechanical model of the gas storage facility's dual-disturbance risk zone, this risk area is designated as a key monitoring area. The instruments and equipment used in the monitoring process must be of higher precision than those used in normal monitoring areas. Monitoring content includes ground vibration, fault disturbance, and natural gas leakage. A real-time monitoring mode combining surface and underground monitoring is implemented. Microseismic monitoring technology is used to monitor ground vibration caused by disturbance sources and fault disturbance within the monitoring area, while internal temperature and pressure monitoring technology is used to monitor natural gas leakage in the gas storage facility.

[0055] Based on the monitoring content and methods, an integrated monitoring system with monitoring, feedback, and analysis functions is formed, so that the monitored data can be fed back to the monitoring personnel in real time, and then the monitoring data can be analyzed to prepare for subsequent safety assessments.

[0056] For example, in Figure 2 In the schematic diagram, the monitoring wells are located near the fault area. The black parts at the bottom of the monitoring wells and on the ground represent the monitoring equipment deployed. Through the combined ground and underground monitoring mode, the stability of the gas storage facility can be fully controlled.

[0057] Step S4: Guided by the refined geomechanical model in Step S1, the numerical simulation prediction model in Step S2, and the gas storage stability monitoring system in Step S3, establish a comprehensive dynamic evaluation system for the stability of the gas storage under dual disturbances.

[0058] Based on the refined geomechanical model of the risk zone of the gas storage facility, the numerical simulation prediction model is combined with the monitoring system, and corresponding evaluation standards for simulation results and monitoring results are established to achieve the stability and safety evaluation of the target gas storage facility.

[0059] Specifically, the simulation and monitoring evaluation criteria are as follows:

[0060] The simulation prediction model uses fault slip, plastic deformation, and ground settlement as evaluation indicators. It uses existing technical standards and combines them with the actual engineering situation to determine the threshold of each indicator, and evaluates the results by comparing the simulation results with the threshold values.

[0061] The monitoring system uses the number of seismic events detected by microseismic technology, as well as the magnitude of temperature and pressure inside the gas storage facility, as evaluation indicators. Thresholds are set for the distribution of seismic events in both fault zones and surface areas. When the number of seismic events in a region exceeds this threshold, it indicates that disturbance and instability have occurred in that region. Similarly, thresholds are also set for the changes in temperature and pressure inside the gas storage facility, and evaluation is performed by comparing the monitored values ​​with these thresholds.

[0062] If any of the above indicators exceeds the threshold, it indicates that there is a risk to the stability of the gas storage facility, and a specific evaluation and analysis is required.

[0063] In step S4, the specific evaluation method is as follows:

[0064] ① When the numerical simulation results do not exceed the threshold, observe the monitoring results. If the monitoring results also do not exceed the threshold, the stability evaluation of the gas storage facility is safe and no measures need to be taken.

[0065] ② When the numerical simulation results do not exceed the threshold, observe the monitoring results. If the monitoring results exceed the threshold, the effectiveness of the monitoring equipment should be checked and monitoring should be repeated. If the monitoring results still exceed the threshold, it means that there is a danger to the stability of the gas storage facility, and corresponding measures should be taken in time. Otherwise, it is safe.

[0066] ③ When the numerical simulation results exceed the threshold, observe the monitoring results. If the monitoring results also exceed the threshold, the stability of the gas storage facility is extremely dangerous, and corresponding measures should be taken immediately.

[0067] ④ When the numerical simulation result exceeds the threshold, observe the monitoring results. If the monitoring result does not exceed the threshold, the accuracy of the numerical simulation prediction model should be checked. If the simulation result still exceeds the threshold after the check, the stability of the gas storage facility is at risk, and corresponding measures should be taken in time. Otherwise, it is safe.

[0068] ⑤ When the evaluation result is dangerous, the gas storage facility should be safely operated by adjusting and optimizing the cyclic injection and production parameters and reducing ground vibration in a timely manner.

[0069] The present invention also provides a computer device, including a processor and a memory, wherein the memory stores a computer program, and the processor executes the computer program to implement the above-described method.

[0070] The present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-described method.

[0071] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of the present invention.

Claims

1. A method for evaluating the stability of shallow gas storage injection and production and ground vibration double disturbance, characterized in that, Specifically comprising the following steps: Step S1, establish the gas storage injection and extraction and ground vibration double disturbance risk area refined geomechanical model: First, collect the basic data of the target gas storage and double disturbance source, secondly, according to the basic data, through the analysis of the geomechanical characteristics of the gas storage itself, the characteristics of the double disturbance source of the gas storage injection and extraction and ground vibration, the geomechanical characteristics of the gas storage under the influence of double disturbance, determine the risk area and other areas of the gas storage under the influence of double disturbance source. Finally, for the double disturbance risk area of the gas storage, a three-dimensional refined geomechanical model is established. Step S2, based on the refined geomechanical model in step S1, establish the numerical simulation prediction model of the risk area of the gas storage: Based on the refined geomechanical model of the double disturbance risk area of the gas storage, the numerical simulation prediction model of the stability of the risk area of the gas storage under the influence of double disturbance of gas storage injection and extraction and ground vibration is established, the stability of the risk area of the gas storage is simulated and predicted, and the stability of the double disturbance risk area of the gas storage is predicted according to the numerical simulation results. Step S3, based on the refined geomechanical model in step S1, establish the stability monitoring system of the gas storage under disturbance: Based on the refined geomechanical model of the double disturbance risk area of the gas storage, the double disturbance risk area of the gas storage is taken as the key monitoring area, and the other areas are taken as the normal monitoring area, wherein the equipment monitoring precision of the key monitoring area is higher than that of the normal monitoring area. According to the required monitoring content, the applicable monitoring means are optimized, and through the real-time monitoring mode of ground + underground combination, the stability monitoring system of the gas storage is established. Step S4, based on the refined geomechanical model in step S1, the numerical simulation prediction model in step S2 and the stability monitoring system of the gas storage in step S3, establish the double disturbance stability comprehensive dynamic evaluation system of the gas storage: Based on the refined geomechanical model of the risk area of the gas storage, the numerical simulation prediction model and the monitoring system are combined, the corresponding simulation result evaluation standard and monitoring result evaluation standard are established respectively, and the stability safety evaluation of the target gas storage is realized.

2. The method of claim 1, wherein, In step S1: the double disturbance source is the cyclic injection and extraction disturbance source of the gas storage and the ground vibration disturbance source; the basic data of the target gas storage and the disturbance source includes: the geological background data of the target gas storage, the geological exploration data, the three-dimensional seismic exploration data, the construction data, the construction data of the injection well and the production well, the basic parameters of the cyclic injection and extraction of the gas storage, the engineering parameters of the ground vibration disturbance area, size, energy and law. Based on the basic data of the target gas storage and the disturbance source, through the preliminary analysis of the geographical location and block structure position characteristics of the gas storage, the reservoir, cap rock, structure, trap and fault characteristics of the gas storage, the trap sealing property of the gas storage, the cyclic injection and extraction characteristics of the gas storage, the ground vibration characteristics, the spatial position relationship between the gas storage, the cyclic injection and extraction well, the ground vibration and the fault is further analyzed, so as to determine the risk area and other areas, and to prepare for the subsequent establishment of the geomechanical model. Among them, the risk area is mainly the fault area which is easy to be damaged under the influence of double disturbance, and the other areas are other areas. According to the basic data of the gas storage and the disturbance source, the boundary of the risk area is limited, and a fine geomechanics model of the double-disturbance risk area of the gas storage is established according to the engineering scale.

3. The method of claim 1, wherein, In S2, the numerical simulation prediction model is based on the fine geomechanics model of the risk area established in S1, and specific simulation parameters are imported according to the actual data of the gas storage and the disturbance source, including relevant stratum parameters, reservoir parameters, cyclic injection-production parameters, ground vibration operation parameters, etc., and a suitable mechanical model is selected, and the boundary conditions conforming to the specifications are set. The contents of simulation prediction are: under the premise that the cyclic injection-production of the gas storage and the ground vibration engineering parameters are set to the maximum intensity, the fault slip deformation and ground subsidence in the risk area of the gas storage.

4. A method as claimed in claim 1, characterized in that In S3, the double-disturbance risk area of the gas storage is taken as the key monitoring area, and the instrument and equipment used in the monitoring process are more accurate than those in the normal monitoring area. The monitoring contents include: ground vibration, fault disturbance, and natural gas leakage. The real-time monitoring mode of ground + underground combination is implemented, the microseismic monitoring technology is used to monitor the ground vibration caused by the disturbance source and the fault disturbance in the monitoring area, and the internal temperature and pressure monitoring technology is used to monitor the natural gas leakage of the gas storage. On the basis of the monitoring content and monitoring means, a monitoring system with the functions of monitoring, feedback and analysis is formed, which is specifically reflected in that the monitored data can be fed back to the monitoring personnel in real time, and then the monitoring data can be analyzed to prepare for the subsequent safety evaluation.

5. The method of claim 1, wherein, In S4, the evaluation criteria for simulation and monitoring are: In the numerical simulation prediction model, fault slip, plastic deformation and ground subsidence are taken as evaluation indexes, the threshold value of each index is determined by combining the existing technical standards with the actual engineering situation, and the evaluation is performed by comparing the simulation results with the threshold value. In the monitoring system, the number of seismic events monitored by the microseismic technology, the internal temperature and pressure of the gas storage are taken as evaluation indexes, and there are threshold values for the number of seismic events in the fault area and the ground area. When the number of seismic events in the area exceeds the threshold value, it represents that there is a disturbance instability phenomenon in the area. Similarly, there is a threshold value for the change amount of the internal temperature and pressure of the gas storage, and the evaluation is performed by comparing the monitoring value with the threshold value. When the result of any index exceeds the threshold value, it represents that there is a risk in the stability of the gas storage, and specific evaluation and analysis are needed.

6. The method of claim 1, wherein, In S4, the specific evaluation method is: ① When the numerical simulation result does not exceed the threshold value, observe the monitoring result, if the monitoring result also does not exceed the threshold value, the stability evaluation of the gas storage is safe at this time, and no measures need to be taken; ② When the numerical simulation result does not exceed the threshold value, observe the monitoring result, if the monitoring result exceeds the threshold value, the effectiveness of the monitoring equipment should be checked and re-monitored at this time, if the monitoring result still exceeds the threshold value, it represents that there is a danger in the stability of the gas storage, and appropriate measures should be taken in time, otherwise it is safe; ③ When the numerical simulation result exceeds the threshold value, observe the monitoring result, if the monitoring result also exceeds the threshold value, the stability of the gas storage is very dangerous at this time, and appropriate measures should be taken immediately. IV. When the numerical simulation result exceeds the threshold value, the monitoring result is observed. If the monitoring result does not exceed the threshold value, the accuracy of the numerical simulation prediction model is checked. If the simulation result still exceeds the threshold value after the checking, the gas storage stability is dangerous, and corresponding measures should be taken in time, otherwise it is safe. V. When the evaluation result is dangerous, the circulating injection-production parameters are adjusted and optimized, and the ground vibration is reduced to ensure the safe operation of the gas storage.

7. The method of claim 1, wherein, In the step S4, the dynamic evaluation system is embodied as follows: The numerical simulation prediction and the monitoring system have a mutual verification relationship. The monitoring system can verify the accuracy of the numerical simulation prediction, and the numerical simulation can verify the applicability of the monitoring system and the effectiveness of the monitoring equipment. When the monitoring system monitors that the other areas outside the risk area have abnormal conditions, the monitoring result is fed back to the step S1 to expand the risk area of the gas storage, and then the three-dimensional refined geomechanical model is expanded, and the newly added risk area is numerically simulated and monitored based on the newly built geomechanical model, so as to achieve the purpose of dynamically evaluating the stability of the gas storage.

8. A computer device comprising a processor and a memory, said memory having stored thereon a computer program, characterized in that, The processor executes the computer program to realize the method of any one of claims 1-7.

9. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to realize the method of any one of claims 1-7.

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