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dc.contributor.authorLi, Vladimir
dc.contributor.authorTsvankin, Ilya
dc.contributor.authorAlkhalifah, Tariq Ali
dc.date.accessioned2016-05-11T07:28:30Z
dc.date.available2016-05-11T07:28:30Z
dc.date.issued2016-04-28
dc.identifier.citationAnalysis of RTM extended images for VTI media 2016, 81 (3):S0 GEOPHYSICS
dc.identifier.issn0016-8033
dc.identifier.issn1942-2156
dc.identifier.doi10.1190/geo2015-0384.1
dc.identifier.urihttp://hdl.handle.net/10754/609002
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. Using 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. We also build angle gathers to facilitate interpretation of the shape of RMO in the extended images. 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.description.sponsorshipWe are grateful to Paul Sava (CWP) and members of the A(nisotropy) and i(maging) teams at CWP for useful discussions. Model 2 represents a modified version of the TTI model created by Hemang Shah of BP (http://www.freeusp.org/2007_BP_Ani_Vel_ Benchmark/). This publication is based upon work supported by the Consortium Project on Seismic Inverse Methods for Complex Structures at CWP and the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OCRF-2014- CRG3-32140407/ORS#2230. The reproducible numeric examples in this paper use the Madagascar open-source software package (Fomel et al., 2013a) freely available from http://www.ahay.org.
dc.language.isoen
dc.publisherSociety of Exploration Geophysicists
dc.relation.urlhttp://library.seg.org/doi/10.1190/geo2015-0384.1
dc.rightsArchived with thanks to GEOPHYSICS
dc.subjectanisotropy
dc.subjectimaging
dc.subjectVTI
dc.subjectwave equation
dc.subjectreverse time migration
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.journalGEOPHYSICS
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionColorado School of Mines, Center for Wave Phenomena, Golden, Colorado, USA
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)
kaust.personAlkhalifah, Tariq Ali
kaust.grant.numberCRG3
refterms.dateFOA2018-06-14T08:03:36Z
kaust.acknowledged.supportUnitOSR
dc.date.published-online2016-04-28
dc.date.published-print2016-05


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