Ground Monitoring of Microseismic Based on Low Signal-to-Noise Ratio

At present, the principle, data acquisition, data processing, and/or interpretation of many microseismic monitoring methods around the world are far from the requirements of microseismic monitoring characteristics, and impossible to analyze the microseismicity. The main technical reason for the situation is still the lack of understanding the characteristics of microseismic and corresponding monitoring for it, so that the monitoring R Among them, the most important is an in-depth understanding of the existing principles: VS uses the focal mechanism (i.e., the relationship between the strain and the stress fields) to implement large-scale migration and stacking, carry out various possible combinations of positive and negative initial movements for all seismic stations, and select the spatiotemporal distribution with high probability of the greater microseismic released energy (i.e., the correlation coefficient recorded of stations, also the minimum S/N). A large number of cases are available for mathematical statistics, which provide a basis for analyzing the details of microseismicity. Finally, we describe the specific morphology of the stimulated rock volume in stimulation, the equivalent microseismic focal mechanism, and the effect of production measures such as in-situ pump shutdown. The necessary conditions, monitoring output patterns and analyses described in the paper also provide a basis for the test of the microseismic methods.