Source location through microseismic cross-correlation imaging
ZENG Zhiyi1,2, ZHANG Jianzhong1,2,3
1. Key Lab of Submarine Geosciences and Prospecting Techniques, MOE, Qingdao, Shandong 266100, China; 2. Functional Laboratory for Marine Mineral Resources Assessment and Prospecting, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266061, China; 3. College of Marine Geosciences, Ocean University of China, Qingdao, Shandong 266100, China
Abstract:Microseismic events may be located through migration and stacking,which improves the signal to noise ratio; it is unnecessary to pick arrival time.But such stacking may be affected by the polarity reversal of first arrivals,and noises cannot be efficiently suppressed.In view of similar waveforms from a same source recorded at different geophones,we propose a method of source location through microseismic cross-correlation imaging.An imaging function is formulated by multiplying cross-correlation coefficients of microseismograms after moveout correction,and then imaging energy at all nodes is calculated.The microseismic source is finally located using the maximum energy.Model and field data tests show that noises and the impact of first-arrival polarity reversal on source imaging could be reduced,which results in improved resolution and location accuracy of source imaging.
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