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Reverse Time Migration with Elastodynamic Gaussian Beams

Jianping Huang, Maolin Yuan, Qing Zhang, Lingxiao Jia, Zhenchun Li, Jiguang Li, Shengtian Zhao
School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China

Elastic migration has been widely paid attention by employing the vector processing of multicomponent
seismic data. Ray based elastic Kirchhoff migration has such properties as high flexibility
and high efficiency. However, it has failed to solve many problems caused by multipath. On the other hand,
elastic reverse-time migration (RTM) based on the two-way wave equation is known to be capable of
dealing with these problems, but it is extremely expensive when applied in 3D cases and velocity model
building. Based on the elastic Kirchhoff-Helmholtz integral, we calculate decoupled backward-continued
wavefields by introducing elastic Green functions for P- and S-waves, which is expressed by a summation
of elastodynamic Gaussian beams. The PP and polarity-corrected PS images are obtained by calculating
the correlation between downward and decoupled backward-continued vector wavefields, where polarity
correction is performed by analyzing the relation between the polarization direction of converted PS
waves and incident angle on the interface. To a large extent, our method combines the high efficiency of
ray-based migration with the high accuracy of wave-equation based reverse-time migration. Application
of this method to multicomponent synthetic datasets from the fault model and Marmousi2 model
demonstrates the validity, flexibility and accuracy of the new method.

Keywords:reverse time migration, elastodynamic Gaussian beams, Green function, polarity correction, correlation.

DOI:
10.1007/s12583-015-0609-9
CLC number:
U469.72
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