Method for realizing underground gas storage pressure rise early warning based on microseism monitoring technology
A micro-seismic and gas storage technology, applied in seismology, geophysical measurement, seismic signal processing, etc., can solve the problems of gas storage damage, poor real-time performance, small monitoring range, etc., to ensure safety, increase pressure, Prevent fault activation, significant effect
Active Publication Date: 2021-08-13
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 invention provides a method for realizing underground gas storage pressure rise early warning based on a microseism monitoring technology. The method comprises the steps of 1) inputting a microseism event positioning result (xi, yi, zi), microseism event occurrence time Ti and a microseism event magnitude Mwi, wherein i belongs to [1, N], and N is the positioning number of the microseism events; 2) equally dividing the monitoring process into Q time windows according to the time length L, and counting the number Pj of microseism events in each time window, wherein j belongs to [1, Q]; 3) determining a time window step length c of microseism event generation frequency analysis, and calculating a current time window microseism event generation frequency anomaly index F according to the statistical parameters in the step 2); 4) determining an earthquake magnitude analysis step length s, and calculating an earthquake magnitude anomaly index R according to the statistical parameters in the step 2); and 5) implementing micro-earthquake early warning in the pressure rise process. According to the method, real-time early warning is carried out on the pressure rise process of the gas storage, when the stratum activity is abnormal, an early warning signal is sent out in time, pressure rise safety of the gas storage is guaranteed, and a decision basis is provided for production, operation and 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