Full-wavefield migration method by amplitude-preserving inverse scattering imaging condition
XU Jie1, YANG Jidong1, WANG Yangzhou2, HUANG Jianping1, GUO Wei2, YANG Yonghong3
1. School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong 266580, China; 2. Shandong Energy Group South America Co., Ltd, Qingdao, Shandong 266580, China; 3. Exploration and Development Research Institute, Shengli Oilfield Company, SINOPEC, Dongying, Shandong 257022, China
Abstract：As seismic wave simulation and imaging methods have made great progress， multiple scattering waves are no longer suppressed as the noise but are used for high-precision seismic imaging. Unlike the conventional imaging method that is based on single scattering，the full-wavefield migration is a new data-driven method for imaging all scattering waves based on the multiple scattering assumption and inversion theory. Based on inverse scattering imaging theory，this paper improves the existing full-wavefield migration scheme and develops an amplitude-preserving inverse scattering imaging condition for high-precision seismic imaging. Laplacian filter and source illumination term are added the cross-correlation imaging condition of the existing direct wave estimation and downward Green’s function to attenuate backscattering and compensate for deep energy. The improved amplitude-preserving inverse scattering imaging condition produces higher imaging accuracy and stronger adaptability for complex structures than the traditional imaging condition. Numerical tests demonstrate the effectiveness and applicability of the proposed method.
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