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Efficient anisotropic quasi-P wavefield extrapolation using an isotropic low-rank approximation

文献类型：期刊论文

作者Zhang, Zhen-dong1,2,3; Liu, Yike1; Alkhalifah, Tariq3; Wu, Zedong3
刊名GEOPHYSICAL JOURNAL INTERNATIONAL
出版日期2018-04-01
卷号213期号:1页码:48-57
关键词Numerical modelling Seismic anisotropy Wave propagation
ISSN号0956-540X
DOI10.1093/gji/ggx543
英文摘要The computational cost of quasi-P wave extrapolation depends on the complexity of the medium, and specifically the anisotropy. Our effective-model method splits the anisotropic dispersion relation into an isotropic background and a correction factor to handle this dependency. The correction term depends on the slope (measured using the gradient) of current wavefields and the anisotropy. As a result, the computational cost is independent of the nature of anisotropy, which makes the extrapolation efficient. A dynamic implementation of this approach decomposes the original pseudo-differential operator into a Laplacian, handled using the low-rank approximation of the spectral operator, plus an angular dependent correction factor applied in the space domain to correct for anisotropy. We analyse the role played by the correction factor and propose a new spherical decomposition of the dispersion relation. The proposed method provides accurate wavefields in phase and more balanced amplitudes than a previous spherical decomposition. Also, it is free of SV-wave artefacts. Applications to a simple homogeneous transverse isotropic medium with a vertical symmetry axis (VTI) and a modified Hess VTI model demonstrate the effectiveness of the approach. The Reverse Time Migration applied to a modified BP VTI model reveals that the anisotropic migration using the proposed modelling engine performs better than an isotropic migration.
WOS关键词MEDIA ; PROPAGATION ; EQUATION
资助项目KAUST ; National Natural Science Foundation of China[41730425]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000448715000004
出版者OXFORD UNIV PRESS
资助机构KAUST ; KAUST ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; KAUST ; KAUST ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; KAUST ; KAUST ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; KAUST ; KAUST ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/89136]  
专题地质与地球物理研究所_中国科学院油气资源研究重点实验室
通讯作者Zhang, Zhen-dong
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.King Abdullah Univ Sci & Technol, Dept Phys Sci & Engn, Thuwal 239556900, Saudi Arabia
推荐引用方式
GB/T 7714		 Zhang, Zhen-dong,Liu, Yike,Alkhalifah, Tariq,et al. Efficient anisotropic quasi-P wavefield extrapolation using an isotropic low-rank approximation[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2018,213(1):48-57.
APA Zhang, Zhen-dong,Liu, Yike,Alkhalifah, Tariq,&Wu, Zedong.(2018).Efficient anisotropic quasi-P wavefield extrapolation using an isotropic low-rank approximation.GEOPHYSICAL JOURNAL INTERNATIONAL,213(1),48-57.
MLA Zhang, Zhen-dong,et al."Efficient anisotropic quasi-P wavefield extrapolation using an isotropic low-rank approximation".GEOPHYSICAL JOURNAL INTERNATIONAL 213.1(2018):48-57.

入库方式： OAI收割

来源：地质与地球物理研究所

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