The Analysis of Equivalent Velocity in Surface Array Micro-seismic Monitoring

A hydraulic fracturing which had 12 fracturing segments was carried out in well Y of Shengli Oilfield. The surface array micro-seismic monitoring had 1000 detectors which were divided into 10 arrays Contrasting with the data size of dozens of detectors, the micro-seismic data of 1000 detectors was increased significantly. In order to realize real-time locating of micro-seismic events and optimize hydraulic fracturing plan, the field processing efficiency must be increased. Whether the effect of equivalent velocity can be accepted in field processing? We built a 3D flat layer model based on logging information, and simulated micro-seismic data with actual recording geometry of well Y. Based on some locating methods, the locations of simulation data can be obtained. Comparing locations with actual gun perforations, the accuracy of locations can incarnate the feasibility of equivalent velocity in field processing of well Y. Finally the optimal equivalent velocity was effectively used to locate source point positions in field processing.