中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地质与地球物理研究所
  3. 中国科学院地质与地球物理研究所
  4. 中国科学院矿产资源研究重点实验室
First-order particle velocity equations of decoupled P- and S-wavefields and their application in elastic reverse time migration

文献类型：期刊论文

作者Li, Zhiyuan1,2,3; Liu, Youshan1,2,5; Liang, Guanghe1,2,3; Xue, Guoqiang1,2,3; Wang, Runjie4
刊名GEOPHYSICS
出版日期2021-11-01
卷号86期号:6页码:S387-S404
ISSN号0016-8033
DOI10.1190/geo2020-0452.1
英文摘要The separation of P-and S-wavefields is considered to be an effective approach for eliminating wave-mode crosstalk in elastic reverse time migration (RTM). At present, the Helmholtz decomposition method is widely used for isotropic media. However, it tends to change the amplitudes and phases of the separated wave fields compared with the original wavefields. Other methods used to obtain pure P-and S-wavefields include the application of the elastic wave equations of the decoupled wavefields. To achieve high computational accuracy, staggered-grid finite-difference (FD) schemes are usually used to numerically solve the equations by introducing an additional stress variable. However, the computational cost of this method is high because a conventional hybrid wavefield (the P-and S-wavefields are mixed together) simulation must be created before the P-and S-wavefields can be calculated. We have developed the first-order particle velocity equations to reduce the computational cost. The equations can describe four types of particle-velocity wavefields: the vector P-wavefield, the scalar P-wavefield, the vector S-wavefield, and the vector S-wavefield rotated in the direction of the curl factor. Without introducing the stress variable, only the four types of particle velocity variables are used to construct the staggered-grid FD schemes; therefore, the computational cost is reduced. We also develop an algorithm to calculate the P and S propagation vectors using the four particle velocities, which is simpler than the Poynting vector. Finally, we apply the velocity equations and propagation vectors to elastic RTM and angle-domain common-image gather computations. These numerical examples illustrate the efficiency of our methods.
WOS关键词COMMON-IMAGE GATHERS ; ANGLE-DOMAIN ; VECTOR ; SEPARATION ; PHASE ; 2D ; LAYER
资助项目Key Research Program of the Institute of Geology & Geophysics, CAS[IGGCAS-201902] ; National Key R&D Program of China[2017YFC0601201]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者SOC EXPLORATION GEOPHYSICISTS
WOS记录号WOS:000744542800001
资助机构Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/103993]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Xue, Guoqiang
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
4.Beijing Univ Civil Engn & Architecture, Sch Geomat & Urban Spatial Informat, Beijing 100044, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Li, Zhiyuan,Liu, Youshan,Liang, Guanghe,et al. First-order particle velocity equations of decoupled P- and S-wavefields and their application in elastic reverse time migration[J]. GEOPHYSICS,2021,86(6):S387-S404.
APA Li, Zhiyuan,Liu, Youshan,Liang, Guanghe,Xue, Guoqiang,&Wang, Runjie.(2021).First-order particle velocity equations of decoupled P- and S-wavefields and their application in elastic reverse time migration.GEOPHYSICS,86(6),S387-S404.
MLA Li, Zhiyuan,et al."First-order particle velocity equations of decoupled P- and S-wavefields and their application in elastic reverse time migration".GEOPHYSICS 86.6(2021):S387-S404.

入库方式： OAI收割

来源：地质与地球物理研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。