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dc.contributor.CRUESPUniversidade Estadual de Campinaspt_BR
dc.typeArtigo de periódicopt_BR
dc.title2D common-offset traveltime based diffraction enhancement and imagingpt_BR
dc.contributor.authorAsgedom, EGpt_BR
dc.contributor.authorGelius, LJpt_BR
dc.contributor.authorTygel, Mpt_BR
unicamp.author.emailmtygel@gmail.compt_BR
unicamp.authorAsgedom, Endrias G. Univ Oslo, Dept Informat, Ctr Imaging, NO-0316 Oslo, Norwaypt_BR
unicamp.authorGelius, Leiv -J. Univ Oslo, Dept Geosci, NO-0316 Oslo, Norwaypt_BR
unicamp.authorTygel, Martin Univ Estadual Campinas, Dept Appl Math, BR-13083859 Campinas, SP, Brazilpt_BR
dc.subjectSemblancept_BR
dc.subjectDiffractionpt_BR
dc.subjectCommon offsetpt_BR
dc.subject.wosMigrationpt_BR
dc.subject.wosSectionspt_BR
dc.subject.wosVelocitypt_BR
dc.subject.wosDepthpt_BR
dc.description.abstractThe diffracted energy in a seismic recording contains key information about small-scale inhomogeneities or discontinuities of the subsurface. Diffractions can therefore lead to high-resolution imaging of subsurface structures associated with hydrocarbon traps. However, seismic diffracted signals are often much weaker than specular reflections and consequently require enhancement before they can be utilized. In this paper diffractions are enhanced relative to reflections based on two traveltime techniques, namely the modified common-reflection-surface approach, which uses the common-reflection-surface technique with some modification to tailor it for diffractions and the replacement-media approach derived here for the purpose of a simplified parametrization of diffraction traveltimes. Both approaches are implemented in the common-offset domain with the use of a finite-offset central ray unlike the zero- or small-offset diffraction enhancement techniques that use a zero-offset central ray. The validity of the two moveout expressions is tested using velocity data taken from a smooth isotropic Marmousi model. A feasibility test was also carried out with respect to the new replacement-media traveltime approximation addressing the various effects of signal-to-noise ratio, depth and lateral displacement of the diffractor location. Finally, diffraction enhancement and imaging was performed on 2D seismic data from the Jequitinhonha basin offshore Brazil. Diffractions were significantly enhanced and a high-resolution image of the discontinuities of the subsurface was obtained.pt
dc.relation.ispartofGeophysical Prospectingpt_BR
dc.relation.ispartofabbreviationGeophys. Prospect.pt_BR
dc.publisher.cityHobokenpt_BR
dc.publisher.countryEUApt_BR
dc.publisherWiley-blackwellpt_BR
dc.date.issued2013pt_BR
dc.date.monthofcirculationNOVpt_BR
dc.identifier.citationGeophysical Prospecting. Wiley-blackwell, v. 61, n. 6, n. 1178, n. 1193, 2013.pt_BR
dc.language.isoenpt_BR
dc.description.volume61pt_BR
dc.description.issuenumber6pt_BR
dc.description.issuespecialSIpt_BR
dc.description.firstpage1178pt_BR
dc.description.lastpage1193pt_BR
dc.rightsfechadopt_BR
dc.rights.licensehttp://olabout.wiley.com/WileyCDA/Section/id-406071.htmlpt_BR
dc.sourceWeb of Sciencept_BR
dc.identifier.issn0016-8025pt_BR
dc.identifier.eissn1365-2478pt_BR
dc.identifier.wosidWOS:000325626700010pt_BR
dc.identifier.doi10.1111/1365-2478.12057pt_BR
dc.description.sponsorshipBrazilian Oil Company (Petrobras)pt_BR
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)pt_BR
dc.description.sponsorship1Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)pt_BR
dc.date.available2014-07-30T13:38:46Z
dc.date.available2015-11-26T17:52:58Z-
dc.date.accessioned2014-07-30T13:38:46Z
dc.date.accessioned2015-11-26T17:52:58Z-
dc.description.provenanceMade available in DSpace on 2014-07-30T13:38:46Z (GMT). No. of bitstreams: 0 Previous issue date: 2013en
dc.description.provenanceMade available in DSpace on 2015-11-26T17:52:58Z (GMT). No. of bitstreams: 0 Previous issue date: 2013en
dc.identifier.urihttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/52578
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/52578-
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