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Non-artifact vector P- and S-wave separation for elastic reverse time migration

文献类型：期刊论文

作者Zhou, Xi-Yan3,4; Chang, Xu2; Wang, Yi-Bo1; Wen, Xiao-Tao3,4; You, Jia-Chun3,4; Sun, Chang3,4
刊名PETROLEUM SCIENCE
出版日期2022-12-01
卷号19期号:6页码:2695-2710
关键词Multicomponent Elastic RTM P-and S-Wave separation Separation artifacts Decoupled velocity-strain equations
ISSN号1672-5107
DOI10.1016/j.petsci.2022.08.006
英文摘要Elastic reverse time migration (RTM) uses the elastic wave equation to extrapolate multicomponent seismic data to the subsurface and separate the elastic wavefield into P-and S-waves. P-and S-wave separation is a necessary step in elastic RTM to avoid crosstalk between coupled wavefields. However, the current curl-divergence operator-based separation method has a polarity reversal problem in PS imaging, and vector separation methods often have separation artifacts at the interface, which affects the quality of the imaging stack. We propose a non-artifact P-and S-wave separation method based on the first-order velocity-strain equation. This equation is used for wavefield extrapolation and separation in the first-order staggered-grid finite-difference scheme, and the storage and calculation amounts are consistent with the classical first-order velocity-stress equation. The separation equation does not calculate the partial derivatives of the elastic parameters, and thus, there is no artifact in the separated P-and S-waves. During wavefield extrapolation, the dynamic characteristics of the reflected wave undergo some changes, but the transmitted wavefield is accurate; therefore, it does not affect the dynamic characteristics of the final migration imaging. Through numerical examples of 2D simple models, part SEAM model, BP model, and 3D 4-layer model, different wavefield separation methods and corre-sponding elastic RTM imaging results are analyzed. We found that the velocity-strain based elastic RTM can image subsurface structures well, without spike artifacts caused by separation artifacts, and without polarity reversal phenomenon of the PS imaging.(c) 2022 The Authors. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/ 4.0/).
WOS关键词LEAST-SQUARES ; IMAGING CONDITION ; FIELD SEPARATION ; MEDIA ; PHASE ; PROPAGATION
资助项目National Natural Science Foundation of China[41774142]
WOS研究方向Energy & Fuels ; Engineering
语种英语
WOS记录号WOS:000920185100001
出版者KEAI PUBLISHING LTD
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/106836]  
专题地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
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Zhou, Xi-Yan
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resource Res, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
3.Chengdu Univ Technol, Coll Geophys, Chengdu 610059, Sichuan, Peoples R China
4.Chengdu Univ Technol, Key Lab Earth Explorat & Informat Tech, Chengdu 610059, Sichuan, Peoples R China
推荐引用方式
GB/T 7714		 Zhou, Xi-Yan,Chang, Xu,Wang, Yi-Bo,et al. Non-artifact vector P- and S-wave separation for elastic reverse time migration[J]. PETROLEUM SCIENCE,2022,19(6):2695-2710.
APA Zhou, Xi-Yan,Chang, Xu,Wang, Yi-Bo,Wen, Xiao-Tao,You, Jia-Chun,&Sun, Chang.(2022).Non-artifact vector P- and S-wave separation for elastic reverse time migration.PETROLEUM SCIENCE,19(6),2695-2710.
MLA Zhou, Xi-Yan,et al."Non-artifact vector P- and S-wave separation for elastic reverse time migration".PETROLEUM SCIENCE 19.6(2022):2695-2710.

入库方式： OAI收割

来源：地质与地球物理研究所

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