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Establishing an effective offset-dependent velocity model by ray tracing and its application in Kirchhoff time migration
Chen, Guiting1,2,3; Wang, Zhenli1,2; Rotimi, Oluwatosin John1,2; Zhang, Suyang1,2
2020-02-25
Source PublicationGEOPHYSICAL PROSPECTING
ISSN0016-8025
Pages14
AbstractConventional 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.
KeywordImaging Modelling Velocity analysis
DOI10.1111/1365-2478.12931
Funding OrganizationNational 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
WOS KeywordTRANSVERSELY ISOTROPIC MEDIA ; APPROXIMATIONS ; MOVEOUT ; ANGLE
Language英语
Funding ProjectNational Key R&D Program of The Ministry of Science and Technology of China[2018YFC0603500]
Funding OrganizationNational 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
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000515682500001
PublisherWILEY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95619
Collection油气资源研究院重点实验室
Corresponding AuthorWang, Zhenli
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
First Author AffilicationKey Laboratory of Petroleum Resource Research, Chinese Academy of Sciences
Corresponding Author AffilicationKey Laboratory of Petroleum Resource Research, Chinese Academy of Sciences
Recommended Citation
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.
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