Abstract
Imaging the PP- and PS-wave for the elastic vector wave reverse-time migration requires separating the P- and S-waves during the wave field extrapolation. The amplitude and phase of the P- and S-waves are distorted when divergence and curl operators are used to separate the P- and S-waves. We present a P- and S-wave amplitude-preserving separation algorithm for the elastic wavefield extrapolation. First, we add the P-wave pressure and P-wave vibration velocity equation to the conventional elastic wave equation to decompose the P- and S-wave vectors. Then, we synthesize the scalar P- and S-wave from the vector Pand S-wave to obtain the scalar P- and S-wave. The amplitude-preserved separated P- and S-waves are imaged based on the vector wave reverse-time migration (RTM). This method ensures that the amplitude and phase of the separated P- and S-wave remain unchanged compared with the divergence and curl operators. In addition, after decomposition, the P-wave pressure and vibration velocity can be used to suppress the interlayer reflection noise and to correct the S-wave polarity. This improves the image quality of P- and S-wave in multicomponent seismic data and the true-amplitude elastic reverse time migration used in prestack inversion.
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This work is supported by Special Research Grant for Non-profit Public Service (No. 201511037), National Natural Science Foundation of China (No. 41504109, 41506084, and 41406071), China Postdoctoral Science Foundation (No. 2015M582060), and Qingdao Municipal Applied Research Projects (No. 2015308).
Yang Jia-Jia, got her PhD Degree in geophysical prospecting from Ocean University of China in 2015. Now she works in Qingdao Institute of Marine Geology as a post-doctoral. Her research interests are seismic wave theory, multi-technology and multi-component seismic wave reverse-time depth migration.
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Yang, JJ., Luan, XW., Fang, G. et al. Elastic reverse-time migration based on amplitude-preserving P- and S-wave separation. Appl. Geophys. 13, 500–510 (2016). https://doi.org/10.1007/s11770-016-0571-z
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DOI: https://doi.org/10.1007/s11770-016-0571-z