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dc.contributor.authorLi, Vladimir
dc.contributor.authorTsvankin, Ilya
dc.contributor.authorAlkhalifah, Tariq Ali
dc.date.accessioned2016-01-10T10:37:19Z
dc.date.available2016-01-10T10:37:19Z
dc.date.issued2015-08-19
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/segam2015-5930996.1
dc.identifier.doi10.1190/segam2015-5930996.1
dc.identifier.urihttp://hdl.handle.net/10754/593185
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.
dc.language.isoen
dc.publisherSociety of Exploration Geophysicists
dc.relation.urlhttp://library.seg.org/doi/10.1190/segam2015-5930996.1
dc.rightsArchived with thanks to SEG Technical Program Expanded Abstracts 2015
dc.subjectVTI
dc.subjectanisotropy
dc.subjectimaging
dc.titleAnalysis of RTM extended images for VTI media
dc.typeArticle
dc.contributor.departmentEarth Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentSeismic Wave Analysis Group
dc.identifier.journalSEG Technical Program Expanded Abstracts 2015
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionCenter for Wave Phenomena, Colorado School of Mines
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)
kaust.personAlkhalifah, Tariq Ali
refterms.dateFOA2018-06-13T13:46:21Z
dc.date.published-online2015-08-19
dc.date.published-print2015-08-19


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