Suppression of dispersion in elastic wavefield simulation by FCT of separated P- and S-waves
文献类型：期刊论文
| 作者 | Liu Cong1,2; Zhou XiYan1,2; Chang Xu3; Wang YiBo3; Cheng BingJie1,2 |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2023-06-01 |
| 卷号 | 66期号:6页码:2534-2549 |
| 关键词 | Elastic wave simulation Finite-difference P- and S-wave separation FCT Suppression of dispersion |
| ISSN号 | 0001-5733 |
| DOI | 10.6038/cjg2022Q0012 |
| 英文摘要 | The finite difference method is widely used in the numerical simulation and propagation of seismic wavefield. The traditional finite difference method uses Taylor series expansion to calculate the spatial partial derivative, but this method will produce numerical dispersion due to grid discretization, which reduces the accuracy of seismic wavefield simulation. The numerical simulation method of optimizing the difference coefficient can suppress some dispersion to a certain extent. However, under the stability condition of the maximum P- wave velocity, due to the large difference of P- and S-wave velocities, the elastic wavefield numerical simulation will lead to obvious numerical dispersion in the shallow low velocity S-wave. To reduce the numerical dispersion coefficient method to and improve the simulation accuracy, this paper first uses the optimized difference grid to reduce part numerical dispersion, and then uses the FCT (Flux-Corrected Transport) further suppress the finite difference numerical dispersion of elastic wavefield. The conventional FCT method directly suppress the elastic wavefield dispersion. But due to the obvious difference in the P- and S-wave velocity, the dispersion of the S-wave is stronger than that of the P-wave. To suppress the S-wave numerical dispersion, it needs to select a larger dispersion suppression parameter, while this will produce artifacts for P-waves. Therefore, this paper proposes a suppression of dispersion method in elastic wavefield simulation by FCT of separated P- and S- waves. By selecting appropriate dispersion suppression parameters for the separated P- and Swave to perform flux correction, the numerical dispersion can be effectively suppressed and the P wave artifacts can be weakened. Through theoretical analysis and numerical examples, it is found that the method in this paper can effectively reduce the numerical dispersion of elastic wave equation finite-difference, and there are no P-wave artifacts compared with the conventional FCT method. |
| WOS关键词 | GRID FINITE-DIFFERENCE ; APPROXIMATION METHOD ; PROPAGATION ; MEDIA ; MIGRATION ; MODEL ; BIOT |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001004188400022 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/111242]  |
| 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 | Zhou XiYan |
| 作者单位 | 1.Chengdu Univ Technol, Coll Geophys, Chengdu 610059, Peoples R China 2.Chengdu Univ Technol, Minist Educ, Key Lab Earth Explorat & Informat Technol, Chengdu 610059, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resource Res, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu Cong,Zhou XiYan,Chang Xu,et al. Suppression of dispersion in elastic wavefield simulation by FCT of separated P- and S-waves[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2023,66(6):2534-2549. |
| APA | Liu Cong,Zhou XiYan,Chang Xu,Wang YiBo,&Cheng BingJie.(2023).Suppression of dispersion in elastic wavefield simulation by FCT of separated P- and S-waves.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,66(6),2534-2549. |
| MLA | Liu Cong,et al."Suppression of dispersion in elastic wavefield simulation by FCT of separated P- and S-waves".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 66.6(2023):2534-2549. |
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。