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Imaging 3-D faults using diffractions with modified dip-angle gathers
Li, Zhengwei1; Zhang, Jianfeng2
2020-03-01
Source PublicationGEOPHYSICAL JOURNAL INTERNATIONAL
ISSN0956-540X
Volume220Issue:3Pages:1569-1584
AbstractAccurate identification of the locations and orientations of small-scale faults plays an important role in seismic interpretation. We have developed a 3-D migration scheme that can image small-scale faults using diffractions in time. This provides a resolution beyond the classical Rayleigh limit of half a wavelength in detecting faults. The scheme images weak diffractions by building a modified dip-angle gather, which is obtained by replacing the two dip angles dimensions of the conventional 2-D dip-angle gather with tangents of the dip angles. We build the modified 2-D dip-angle gathers by calculating the tangents of dip angles following 3-D prestack time migration (PSTM). In the resulting modified 2-D dip-angle gathers, the Fresnel zone related to the specular reflection exhibits an ellipse. Comparing with the conventional 2-D dip-angle gather, diffraction event related a fault exhibits a straight cylinder shape with phase-reversal across a line related the orientation of the fault. As a result, we can not only mute the Fresnel zones related to reflections, correct phase for edge diffractions and obtain the image of faults, but also detect the orientations of 3-13 faults using the modified dip-angle gathers. Like the conventional dip-angle gathers, the modified dip-angle gathers can also be used to image diffractions resulting from other sources. 3-D Field data tests demonstrate the validity of the proposed diffraction imaging scheme.
KeywordImage processing Wave propagation Wave scattering and diffraction
DOI10.1093/gji/ggz527
Funding OrganizationNational Natural Science Fund of China ; National Natural Science Fund of China ; National Major Project of China ; National Major Project of China ; National Natural Science Fund of China ; National Natural Science Fund of China ; National Major Project of China ; National Major Project of China ; National Natural Science Fund of China ; National Natural Science Fund of China ; National Major Project of China ; National Major Project of China ; National Natural Science Fund of China ; National Natural Science Fund of China ; National Major Project of China ; National Major Project of China
WOS KeywordSEPARATION
Language英语
Funding ProjectNational Natural Science Fund of China[41330316] ; National Natural Science Fund of China[41574135] ; National Major Project of China[2017ZX05008-007]
Funding OrganizationNational Natural Science Fund of China ; National Natural Science Fund of China ; National Major Project of China ; National Major Project of China ; National Natural Science Fund of China ; National Natural Science Fund of China ; National Major Project of China ; National Major Project of China ; National Natural Science Fund of China ; National Natural Science Fund of China ; National Major Project of China ; National Major Project of China ; National Natural Science Fund of China ; National Natural Science Fund of China ; National Major Project of China ; National Major Project of China
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000525944600009
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95563
Collection油气资源研究院重点实验室
Corresponding AuthorZhang, Jianfeng
Affiliation1.Chinese Acad Sci, Key Lab Petr Resources Res, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen 518055, Peoples R China
Recommended Citation
GB/T 7714
Li, Zhengwei,Zhang, Jianfeng. Imaging 3-D faults using diffractions with modified dip-angle gathers[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2020,220(3):1569-1584.
APA Li, Zhengwei,&Zhang, Jianfeng.(2020).Imaging 3-D faults using diffractions with modified dip-angle gathers.GEOPHYSICAL JOURNAL INTERNATIONAL,220(3),1569-1584.
MLA Li, Zhengwei,et al."Imaging 3-D faults using diffractions with modified dip-angle gathers".GEOPHYSICAL JOURNAL INTERNATIONAL 220.3(2020):1569-1584.
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