Establishing an effective offset-dependent velocity model by ray tracing and its application in Kirchhoff time migration
文献类型：期刊论文
| 作者 | Chen, Guiting1,2,3; Wang, Zhenli2,3; Rotimi, Oluwatosin John2,3; Zhang, Suyang2,3 |
| 刊名 | GEOPHYSICAL PROSPECTING
 |
| 出版日期 | 2020-02-25 |
| 页码 | 14 |
| 关键词 | Imaging Modelling Velocity analysis |
| ISSN号 | 0016-8025 |
| DOI | 10.1111/1365-2478.12931 |
| 英文摘要 | Conventional Kirchhoff prestack time migration based on the hyperbolic moveout can cause ambiguity in laterally inhomogeneous media, because the root mean square velocity corresponds to a one-dimensional model under the horizontal layer assumption; it does not include the lateral variations. The shot/receiver configuration with different offsets and azimuths should adopt different migration velocities as they contribute to a single image point. Therefore, we propose to use an offset-vector to describe the lateral variations through an offset-dependent velocity corresponding to the difference in offset from surface points to the image point. The offset-vector is decomposed into orthogonal directions along the in-line and cross-line directions so that the single velocity can be expressed as a series of actual velocities. We use a simple Snell's law-based ray tracing to calculate the travel time recorded at the image point and convert the travel time to an equivalent velocity corresponding to a pseudo-straight ray. The double-square-root equation using such an equivalent velocity in the offset-vector domain is non-hyperbolic and asymmetrical, which improves the accuracy of the migration. Numerical examples using the Marmousi model and a wide azimuth field data show that the proposed method can achieve reasonable accuracy and significantly enhances the imaging of complex structures. |
| WOS关键词 | TRANSVERSELY ISOTROPIC MEDIA ; APPROXIMATIONS ; MOVEOUT ; ANGLE |
| 资助项目 | National Key R&D Program of The Ministry of Science and Technology of China[2018YFC0603500] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000515682500001 |
| 出版者 | WILEY |
| 资助机构 | National Key R&D Program of The Ministry of Science and Technology of China ; National Key R&D Program of The Ministry of Science and Technology of China ; National Key R&D Program of The Ministry of Science and Technology of China ; National Key R&D Program of The Ministry of Science and Technology of China ; National Key R&D Program of The Ministry of Science and Technology of China ; National Key R&D Program of The Ministry of Science and Technology of China ; National Key R&D Program of The Ministry of Science and Technology of China ; National Key R&D Program of The Ministry of Science and Technology of China ; National Key R&D Program of The Ministry of Science and Technology of China ; National Key R&D Program of The Ministry of Science and Technology of China ; National Key R&D Program of The Ministry of Science and Technology of China ; National Key R&D Program of The Ministry of Science and Technology of China ; National Key R&D Program of The Ministry of Science and Technology of China ; National Key R&D Program of The Ministry of Science and Technology of China ; National Key R&D Program of The Ministry of Science and Technology of China ; National Key R&D Program of The Ministry of Science and Technology of China |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/95619]  |
| 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 | Wang, Zhenli |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China 3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Guiting,Wang, Zhenli,Rotimi, Oluwatosin John,et al. Establishing an effective offset-dependent velocity model by ray tracing and its application in Kirchhoff time migration[J]. GEOPHYSICAL PROSPECTING,2020:14. |
| APA | Chen, Guiting,Wang, Zhenli,Rotimi, Oluwatosin John,&Zhang, Suyang.(2020).Establishing an effective offset-dependent velocity model by ray tracing and its application in Kirchhoff time migration.GEOPHYSICAL PROSPECTING,14. |
| MLA | Chen, Guiting,et al."Establishing an effective offset-dependent velocity model by ray tracing and its application in Kirchhoff time migration".GEOPHYSICAL PROSPECTING (2020):14. |
入库方式： OAI收割
来源：地质与地球物理研究所
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