A method for early warning of pressure increase in underground gas storage based on microseismic monitoring technology
A micro-seismic and gas storage technology, applied in seismology, seismic signal processing, geophysical measurement, etc., can solve the problems of gas storage sealing failure, poor real-time performance, small monitoring range, etc., to ensure safe pressure increase, Significant effect of preventing fault activation
Active Publication Date: 2022-04-22
OPTICAL SCI & TECH (CHENGDU) LTD
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Problems solved by technology
[0003] At present, domestic gas storage safety monitoring generally adopts conventional monitoring methods such as temperature, pressure, fluid components, and tracers. Poor, when the collected parameters have significant changes, the airtightness of the gas storage may have been damaged
According to the survey, there is no relevant domestic research results on the use of microseismic monitoring technology for early warning of gas storage pressure increase
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[0026] The method for realizing the early warning of the pressure increase of the underground gas storage based on the microseismic monitoring technology includes the following steps:
[0027] 1) Input the microseismic event location result (x i ,y i ,z i ), microseismic event occurrence time T i , Microseismic event magnitude M wi ; Wherein, i∈[1, N], N is the number of microseismic event location;
[0028] figure 1 For the positioning results of the input microseismic events, there are 536 microseismic events in this example, and each input microseismic event contains spatial location, occurrence time, and magnitude energy information.
[0029] 2) Divide the monitoring process into Q time windows according to the length of time L, and count the number P of microseismic events in each time window j ;where j∈[1,Q];
[0030] figure 2 For the statistical results of the number of microseismic events in different time windows, the time length L of this example is selected...
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The present invention provides a method based on the microseismic monitoring technology to realize the early warning of the pressure increase of the underground gas storage, which comprises the following steps: 1) inputting the microseismic event positioning result (x i ,y i ,z i ), microseismic event occurrence time T i , Microseismic event magnitude M wi ; where, i∈[1, N], N is the number of microseismic event locations; 2) Divide the monitoring process into Q time windows according to the length of time L, and count the number P of microseismic events in each time window j ; where j∈[1, Q]; 3) Determine the microseismic event generation frequency analysis time window step c, calculate the current time window microseismic event generation frequency anomaly index F according to the statistical parameters in step 2); 4) Determine the magnitude analysis The step size is s, and the magnitude anomaly index R is calculated according to the statistical parameters in step 2); 5) Micro-earthquake early warning is implemented during the boosting process. The method of the present invention performs real-time early warning on the process of raising the pressure of the gas storage, and sends out an early warning signal in time when abnormalities occur in stratum activities, so as to ensure the safety of the pressure raising of the gas storage and provide decision-making basis for the production and operation management of the gas storage.
Description
technical field [0001] The invention relates to a method for processing and interpreting microseismic data in gas storage safety monitoring and geophysical exploration, and is a method for realizing pressure raising and early warning of underground gas storage based on microseismic monitoring technology. Background technique [0002] Compared with foreign countries, my country's geological conditions are complex, with the characteristics of broken geological structures, complex fault blocks, deep reservoir burial, and strong heterogeneity. Therefore, the site selection, design and engineering implementation of gas storage construction in my country are difficult and the investment costs are high. ; In addition, the reconstruction of gas storage in the mid-to-late stage of the gas reservoir must go through a period of 5-8 years for capacity expansion to reach production, and the storage construction period is relatively long. Increasing the upper limit of the operating pressur...
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IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/288G01V1/30
Inventor 魏路路王熙明徐刚余刚安树杰夏淑君容娇君梁蓓蓓冯超
Owner OPTICAL SCI & TECH (CHENGDU) LTD