Vector field dot product cross-correlation imaging based on 3D elastic wave separation
Wang Pengfei1,2,3, He Bingshou1,2,3
1. Key Laboratory of Geosciences and Prospecting Technology, Ministry of Education, Qingdao, Shandong 266100, China;
2. Laboratory of Evaluation and Detection Technology for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266100, China;
3. Ocean University of China, Qingdao, Shandong 266100, China
Abstract：Since vector S-wave conversion into scalar potential waves is sometime inaccurate in conventional elastic wave reverse-time migrations (RTM),we propose in this paper vector field dot product cross-correlation imaging approach based on 3D elastic wave separation. Firstly,we obtain scalar longitudinal waves and vector shear waves with a conventional wave field separation. Then,we obtain vector potential P-waves by introducing gradient of scalar wave,and vector potential S-waves with curl operator calculation. After that,with Poynting vector of elastic waves we decompose vector potential P-waves and vector potential S-waves into forward-backward going waves,up-down going waves,and left-right going waves respectively. Finally,we perform dot product cross-correlation respectively on these waves at source and receiver points,and obtain PP-wave migration sections,PS-wave migration sections,SP-wave migration sections,and SS-wave migration sections. The proposed imaging approach can suppress low-frequency noise and does not need the polarity correction for the converted wave imaging. Model data tests demonstrate the accuracy and validity of the proposed approach.
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Wang Pengfei, He Bingshou. Vector field dot product cross-correlation imaging based on 3D elastic wave separation. OGP, 2017, 52(3): 477-483.
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