Common-shot prestack Gaussian beam depth migration in anisotropic media

Duan, Xinyi; Li, Chun; Huang, Jianping; Yang, Shanshan; Zhang, Qing

doi:10.1190/igcbeijing2014-112

Beijing 2014 International Geophysical Conference &Amp; Exposition, Beijing, China, 21-24 April 2014 2014

DOI: 10.1190/igcbeijing2014-112

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Common-shot prestack Gaussian beam depth migration in anisotropic media

Xinyi Duan

Chun Li

Jianping Huang

et al.

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“…Zhu et al (2005Zhu et al ( , 2007 realized an efficient anisotropic prestack Gaussian beam migration by redefining the anisotropic ray tracing systems based on phase velocity. In recent years, a true-amplitude Gaussian beam migration (Gray and Bleistein, 2009;Tcheverda, 2011, 2012), an elastic Gaussian beam migration (Yue, 2011), a least-squares Gaussian beam migration (Hu et al, 2016;Yue et al, 2021) and an anisotropic Gaussian beam migration (Duan et al, 2014) have also been developed.…”

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Reverse time migration with Gaussian beams using optimized ray tracing systems in transversely isotropic media

Liu

Xiao

et al. 2021

Geophysical Prospecting

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Prestack depth migration is a key technology for imaging complex reservoirs in media with strong lateral velocity variations. Prestack migrations are broadly separated into ray-based and wave-equation-based methods. Because of its efficiency and flexibility, ray-based Kirchhoff migration is popular in the industry. However, it has difficulties in dealing with the multi-arrivals, caustics and shadow zones. On the other hand, waveequation-based methods produce images superior to that of the ray-based methods, but they are expensive numerically, especially methods based on two-way propagators in imaging large regions. Therefore, reverse time migration algorithms with Gaussian beams have recently been proposed to reduce the cost, as they combine the high computational efficiency of Gaussian beam migration and the high accuracy of reverse time migration. However, this method was based on the assumption that the subsurface is isotropic. As the acquired azimuth and maximum offsets increase, taking into account the influence of anisotropy on seismic migration is becoming more and more crucial. Using anisotropic ray tracing systems in terms of phase velocity, we proposed an anisotropic reverse time migration using the Gaussian beams method. We consider the influence of anisotropy on the propagation direction and calculate the amplitude of Gaussian beams with optimized correlation coefficients in dynamic ray tracing, which simplifies the calculations and improves the applicability of the proposed method. Numerical tests on anisotropic models demonstrate the efficiency and accuracy of the proposed method, which can be used to image complex structures in the presence of anisotropy in the overburden.

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Reverse time migration with Gaussian beams using optimized ray tracing systems in transversely isotropic media

Liu

Xiao

et al. 2021

Geophysical Prospecting

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Common-shot prestack Gaussian beam depth migration in anisotropic media

Cited by 1 publication

References 6 publications

Reverse time migration with Gaussian beams using optimized ray tracing systems in transversely isotropic media

Reverse time migration with Gaussian beams using optimized ray tracing systems in transversely isotropic media

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