Elastic Reverse Time Migration Based on Decoupled Wave Equation and Inner Product Imaging Condition
P. Yong, J.P. Huang, Z.C. Li, L.P. Qu, Q.Y. Li and P.J. Liu
Event name: 78th EAGE Conference and Exhibition 2016
Session: Multi-component Seismic Imaging
Publication date: 31 May 2016
Info: Extended abstract, PDF ( 1.38Mb )
Price: € 20
In conventional elastic reverse time migration, Helmholtz Decomposition is applied for wavefield separation, which leads to polarity reversal in converted wave imaging. In this paper, we introduce a vector wavefields separation method with amplitude preserved based on decoupled elastic wave equation and illuminate the specific physical meaning of the vector P- and S-wave. In addition, the inner product imaging condition is utilized to obtain image results form the vector P- and S-wavefield. Analysis of imaging kernel indicates that the presented method can effectively circumvent polarity reversal in ground seismic exploration. Migration results have demonstrated the feasibility and effectiveness of this imaging method.