Han Jianguang1,2, Wang Yun3, Lu Jun4, Hu Lianlian4, Wang Yanqiang4
1. Key Laboratory of Mineral Resources, Institute of Ueology and Ueophysics, Chinese Academy of Sciences, Beijing 100029, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Institute of Ueochemistry, Chinese Academy of Sciences, Uuiyang, Uuizhou 550002, China;
4. China University of Ueosciences(Beijing), Bei-jing 100083, China
Abstract：Based on multi-component seismic data offsetdomain common-image gathers flattening principle,an elastic wave migration velocity analysis is proposed in this paper.According to the elastic Kirchhoff pre-stack depth migration equation,PPand PS-waves offset-domain common-image gathers are extracted respectively.Then,migration velocity fields of P-and S-waves are updated based on residual moveout equation.If target depths in the migration profiles between Z-and X-components are inconsistent,depth matching is performed with adjusting the shear wave velocity.So the high precision P-and S-wave velocities are obtained.The velocity update method and depth matching method are presented respectively in the paper.Tests of synthetic and field data illustrate that the method is an applicable and efficient elastic wave migration velocity analysis method.
