Analysis of RTM extended images for VTI media

Handle URI:
http://hdl.handle.net/10754/593185
Title:
Analysis of RTM extended images for VTI media
Authors:
Li, Vladimir; Tsvankin, Ilya; Alkhalifah, Tariq Ali ( 0000-0002-9363-9799 )
Abstract:
Extended images obtained from reverse-time migration (RTM) contain information about the accuracy of the velocity field and subsurface illumination at different incidence angles. Here, we evaluate the influence of errors in the anisotropy parameters on the shape of the residual moveout (RMO) in P-wave RTM extended images for VTI (transversely isotropic with a vertical symmetry axis) media. Considering the actual spatial distribution of the zero-dip NMO velocity (Vnmo), which could be approximately estimated by conventional techniques, we analyze the extended images obtained with distorted fields of the parameters η and δ. Differential semblance optimization (DSO) and stack-power estimates are employed to study the sensitivity of focusing to the anisotropy parameters. The results show that the signature of η is dip-dependent, whereas errors in δ cause defocusing only if that parameter is laterally varying. Hence, earlier results regarding the influence of η and δ on reflection moveout and migration velocity analysis remain generally valid in the extended image space for complex media. The dependence of RMO on errors in the anisotropy parameters provides essential insights for anisotropic wavefield tomography using extended images.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Vladimir Li, Ilya Tsvankin, and Tariq Alkhalifah (2015) Analysis of RTM extended images for VTI media. SEG Technical Program Expanded Abstracts 2015: pp. 519-524. doi: 10.1190/segam2015-5930996.1
Publisher:
Society of Exploration Geophysicists
Journal:
SEG Technical Program Expanded Abstracts 2015
Issue Date:
19-Aug-2015
DOI:
10.1190/segam2015-5930996.1
Type:
Article
Additional Links:
http://library.seg.org/doi/10.1190/segam2015-5930996.1
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorLi, Vladimiren
dc.contributor.authorTsvankin, Ilyaen
dc.contributor.authorAlkhalifah, Tariq Alien
dc.date.accessioned2016-01-10T10:37:19Zen
dc.date.available2016-01-10T10:37:19Zen
dc.date.issued2015-08-19en
dc.identifier.citationVladimir Li, Ilya Tsvankin, and Tariq Alkhalifah (2015) Analysis of RTM extended images for VTI media. SEG Technical Program Expanded Abstracts 2015: pp. 519-524. doi: 10.1190/segam2015-5930996.1en
dc.identifier.doi10.1190/segam2015-5930996.1en
dc.identifier.urihttp://hdl.handle.net/10754/593185en
dc.description.abstractExtended images obtained from reverse-time migration (RTM) contain information about the accuracy of the velocity field and subsurface illumination at different incidence angles. Here, we evaluate the influence of errors in the anisotropy parameters on the shape of the residual moveout (RMO) in P-wave RTM extended images for VTI (transversely isotropic with a vertical symmetry axis) media. Considering the actual spatial distribution of the zero-dip NMO velocity (Vnmo), which could be approximately estimated by conventional techniques, we analyze the extended images obtained with distorted fields of the parameters η and δ. Differential semblance optimization (DSO) and stack-power estimates are employed to study the sensitivity of focusing to the anisotropy parameters. The results show that the signature of η is dip-dependent, whereas errors in δ cause defocusing only if that parameter is laterally varying. Hence, earlier results regarding the influence of η and δ on reflection moveout and migration velocity analysis remain generally valid in the extended image space for complex media. The dependence of RMO on errors in the anisotropy parameters provides essential insights for anisotropic wavefield tomography using extended images.en
dc.language.isoenen
dc.publisherSociety of Exploration Geophysicistsen
dc.relation.urlhttp://library.seg.org/doi/10.1190/segam2015-5930996.1en
dc.rightsArchived with thanks to SEG Technical Program Expanded Abstracts 2015en
dc.subjectVTIen
dc.subjectanisotropyen
dc.subjectimagingen
dc.titleAnalysis of RTM extended images for VTI mediaen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalSEG Technical Program Expanded Abstracts 2015en
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionCenter for Wave Phenomena, Colorado School of Minesen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorAlkhalifah, Tariq Alien
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