A stable excitation amplitude imaging condition for reverse time migration in elastic wave equation
文献类型：期刊论文
| 作者 | Zhang Zhi1; Liu You-Shan2,3; Xu Tao2; Bat Zhi-Ming2 |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2013-10-01 |
| 卷号 | 56期号:10页码:3523-3533 |
| 关键词 | Elastic wave equation Reverse time migration Imaging condition Energy density Stable excitation amplitude Excitation time Normalized correlation |
| ISSN号 | 0001-5733 |
| DOI | 10.6038/cjg20131027 |
| 文献子类 | Article |
| 英文摘要 | A stable excitation amplitude (SEA) imaging condition for the elastic wave equation is proposed. In the propagation of the source wavefield extrapolation along a positive time axis, the energy density for total grid points are computed at each time-step, and the traveltime as well as wavefield values corresponding to the maximum energy density are saved as the excitation criterion. While in the propagation of the receiver wavefield extrapolation along a negative time axis, the excitation criterion is applied to obtain the imaging profiles at each grid point that satisfies the image time at each time step. Then the receiver wavefield is normalized by the source wavefield to form the angle-dependent reflection coefficient profiles. Compared to the normalized correlation (NC) imaging condition, the SEA imaging condition can eliminate the need of the hard disk, which saves a large volume of hard disk space (especially for three dimensions) and avoid a lot of I/O tasks. Consequently, the computational efficiency is enhanced significantly due to the application of SEA imaging condition. Compared to the excitation traveltime (ET) imaging condition in elastic media, the polarity reverse of horizontal component at opposite sides of the source will be corrected automatically to enhance the imaging when it involves in the stacking of many shot profiles, which is beneficial from the normalized amplitude (i. e. the angle-dependent reflection coefficients). Numerical tests validate the feasibility of the SEA imaging condition. When comparing the NC imaging condition with the SEA imaging condition in the numerical tests, the latter has a small computational amount than the former, and the latter can produce less low-frequency artifacts, and also has better imaging capability as well as higher spatial resolution than the former. |
| WOS关键词 | FINITE-DIFFERENCE METHOD ; TRAVEL-TIME ; HETEROGENEOUS MEDIA ; FREQUENCY-DOMAIN ; SYNTHETIC SEISMOGRAMS ; DEPTH MIGRATION ; TRUE-AMPLITUDE ; ANGLE-DOMAIN ; ONE-WAY ; PROPAGATION |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000326848400027 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/87464]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Zhang Zhi |
| 作者单位 | 1.Guilin Univ Technol, Guangxi Sci Expt Ctr Min Met & Environm, Guangxi Key Lab Hidden Metall Ore Deposits Explor, Guilin 541004, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State key Lab Lithospher Evolut, Beijing 100029, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang Zhi,Liu You-Shan,Xu Tao,et al. A stable excitation amplitude imaging condition for reverse time migration in elastic wave equation[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2013,56(10):3523-3533. |
| APA | Zhang Zhi,Liu You-Shan,Xu Tao,&Bat Zhi-Ming.(2013).A stable excitation amplitude imaging condition for reverse time migration in elastic wave equation.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,56(10),3523-3533. |
| MLA | Zhang Zhi,et al."A stable excitation amplitude imaging condition for reverse time migration in elastic wave equation".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 56.10(2013):3523-3533. |
入库方式： OAI收割
来源：地质与地球物理研究所
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