Obtaining AVO and AVA curves from CRS attributes

dc.creatorBiloti, R
dc.creatorPortugal, RS
dc.creatorSantos, LT
dc.creatorTygel, M
dc.date2001
dc.dateDEC
dc.date2014-11-13T18:27:36Z
dc.date2015-11-26T17:10:56Z
dc.date2014-11-13T18:27:36Z
dc.date2015-11-26T17:10:56Z
dc.date.accessioned2018-03-28T23:59:28Z
dc.date.available2018-03-28T23:59:28Z
dc.identifierJournal Of Seismic Exploration. Geophysical Press, v. 10, n. 41699, n. 19, n. 29, 2001.
dc.identifier0963-0651
dc.identifierWOS:000174651700003
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/62339
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/62339
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/62339
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1280981
dc.descriptionWe present a method to obtain amplitude-versus-offset (AVO) and amplitude-versus-angle (AVA) curves at selected depth points using the three attributes generated by the Common Reflection Surface (CRS) stack: the emergence angle and the two hypothetical wavefront curvatures associated to each zero-offset ray simulated. Our approach combines the CRS stack/inversion process applied to multicoverage data and the use of a kinematic Kirchhoff migration to achieve true-amplitudes (TA) at assigned depth points in the migrated images. The proposed method consists of the following steps: (i) apply the CRS process to the given multicoverage data; the obtained CRS attributes are then used to produce a simple macro-velocity depth model; (ii) perform an unweighted Kirchhoff migration for imaging purposes only; for selected points on target reflectors in the migrated image, we use ray tracing within the macro-velocity model to determine, by ray tracing, common-reflection-point (CRP) gathers that belong to the input data; for these rays, we compute the incident angles and the geometrical spreadings, (iii) go back to CRP gathers and compensate the amplitudes for geometrical spreading. The whole process permits to construct AVA curves on the assigned CRP's, In summary, our method is designed to aggregate amplitude information on selected points of a reflector, after a purely kinematic image (migration) has been obtained. The method is tested on a synthetic inhomogeneous layered model with encouraging results.
dc.description10
dc.description41699
dc.description19
dc.description29
dc.languageen
dc.publisherGeophysical Press
dc.publisherCastelnau-le-lez
dc.publisherFrança
dc.relationJournal Of Seismic Exploration
dc.relationJ. Seism Explor.
dc.rightsfechado
dc.sourceWeb of Science
dc.subjectmigration
dc.subjectCommon Reflection Surface
dc.subjectAVO
dc.subjectAVA
dc.subjectmacrovelocity model
dc.subjectinversion
dc.subjectReflection
dc.titleObtaining AVO and AVA curves from CRS attributes
dc.typeArtículos de revistas


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