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dc.contributor.authorBona, Andrej
dc.date.accessioned2017-01-30T12:00:37Z
dc.date.available2017-01-30T12:00:37Z
dc.date.created2011-05-17T20:01:36Z
dc.date.issued2011
dc.identifier.citationBona, Andrej. 2011. Shot-gather time migration of planar reflectors without velocity model. Geophysics. 76 (2): pp. S93-S101.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/17241
dc.identifier.doi10.1190/1.3549641
dc.description.abstract

Standard migration techniques require a velocity model. A new and fast prestack time migration method is presented that does not require a velocity model as an input. The only input is a shot gather, unlike other velocity-independent migrations that also require input of data in other gathers. The output of the presented migration is a time-migrated image and the migration velocity model. The method uses the first and second derivatives of the traveltimes with respect to the location of the receiver. These attributes are estimated by computing the gradient of the amplitude in a shot gather. The assumptions of the approach are a laterally slowly changing velocity and reflectors with small curvatures; the dip of the reflector can be arbitrary. The migration velocity corresponds to the root mean square (rms) velocity for laterally homogeneous media for near offsets. The migration expressions for 2D and 3D cases are derived from a simple geometrical construction considering the image of the source. The strengths and weaknesses of the methods are demonstrated on synthetic data. At last, the applicability of the method is discussed by interpreting the migration velocity in terms of the Taylor expansion of the traveltime around the zero offset.

dc.publisherSociety of Exploration Geophysicists
dc.titleShot-gather time migration of planar reflectors without velocity model
dc.typeJournal Article
dcterms.source.volume76
dcterms.source.number2
dcterms.source.startPage93
dcterms.source.endPage101
dcterms.source.issn0016-8033
dcterms.source.titleGeophysics
curtin.note

Copyright © 2011 Society of Exploration Geophysicists.

curtin.departmentDepartment of Exploration Geophysics
curtin.accessStatusOpen access


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