Weighted-elastic-wave interferometric imaging of microseismic source location
Li Lei1,2, Chen Hao1, and Wang Xiu-Ming1
1. State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China.
2. University of Chinese Academy of Sciences, Beijing 100049, China.
Abstract Knowledge of the locations of seismic sources is critical for microseismic monitoring. Time-window-based elastic wave interferometric imaging and weighted-elastic-wave (WEW) interferometric imaging are proposed and used to locate modeled microseismic sources. The proposed method improves the precision and eliminates artifacts in location profiles. Numerical experiments based on a horizontally layered isotropic medium have shown that the method offers the following advantages: It can deal with low-SNR microseismic data with velocity perturbations as well as relatively sparse receivers and still maintain relatively high precision despite the errors in the velocity model. Furthermore, it is more efficient than conventional traveltime inversion methods because interferometric imaging does not require traveltime picking. Numerical results using a 2D fault model have also suggested that the weighted-elastic-wave interferometric imaging can locate multiple sources with higher location precision than the time-reverse imaging method.
This work is supported by the R&D of Key Instruments and Technologies for Deep Resources Prospecting ( No. ZDYZ2012-1) and National Natural Science Foundation of China (No. 11374322).
Cite this article:
Li Lei,Chen Hao,Wang Xiu-Ming. Weighted-elastic-wave interferometric imaging of microseismic source location[J]. APPLIED GEOPHYSICS, 2015, 12(2): 221-234.
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