Multiwave velocity analysis based on Gaussian beam prestack depth migration |
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Authors: | Jian-Guang Han Yun Wang Ning Han Zhan-Tao Xing Jun Lu |
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Institution: | 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China 2. University of Chinese Academy of Sciences, Beijing, 100049, China 3. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China 4. College of Resources and Environment, Southwest University, Chongqing, 400716, China 5. China University of Geosciences (Beijing), Beijing, 100083, China
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Abstract: | Prestack depth migration of multicomponent seismic data improves the imaging accuracy of subsurface complex geological structures. An accurate velocity field is critical to accurate imaging. Gaussian beam migration was used to perform multicomponent migration velocity analysis of PP- and PS-waves. First, PP- and PS-wave Gaussian beam prestack depth migration algorithms that operate on common-offset gathers are presented to extract offset-domain common-image gathers of PP- and PS-waves. Second, based on the residual moveout equation, the migration velocity fields of P- and S-waves are updated. Depth matching is used to ensure that the depth of the target layers in the PP- and PS-wave migration profiles are consistent, and high-precision P- and S-wave velocities are obtained. Finally, synthetic and field seismic data suggest that the method can be used effectively in multiwave migration velocity analysis. |
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