Multi-source elastic full waveform inversion based on P-wave and S-wave separation
HUANG Shaohua1, REN Zhiming1, LI Zhenchun1, GU Bingluo1, LI Hongmei2
1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China; 2. Geophysical Research Institute, Shengli Oilfield Branch Co., SINOPEC, Dongying, Shandong 257022, China
Abstract：The elastic wave full waveform inversion (EFWI) can obtain high-accuracy P-wave and S-wave velocity,and density,but the computational cost is rather high.The P-wave and S-wave coupling causes crosstalk noise and decrease inversion accuracy.Multi-source coding can greatly improve EFWI calculation efficiency,but increasing the wavefield complexity,leading to more serious nonlinear problems.In this paper,a multi-source elastic wave full waveform inversion method based on P-wave and S-wave separation is proposed.The method uses dynamic random coding to suppress multi-source crosstalk noise,and uses wavefield separation to mitigate crosstalk effects caused by the P-wave and S-wave coupling.The proposed method is tested on the Marmousi model with consistent P-wave and S-wave velocity structures and on the Marmousi-Ⅱ model with uncorrelated P-wave and S-wave velocity structures.The results show that the inversion method can effectively suppress crosstalk noise and improve computational efficiency.
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