Comparison of Methods for Extracting ADCIGS from RTM

dc.contributor.authorJin, Huen_US
dc.contributor.authorMcMechan, George A.en_US
dc.contributor.authorGuan, Huiminen_US
dc.contributor.utdAuthorMcMechan, George A.en_US
dc.date.accessioned2014-11-06T20:18:16Z
dc.date.available2014-11-06T20:18:16Z
dc.date.created2014-04-01en_US
dc.date.issued2014-04-01en_US
dc.description"This paper is Contribution No. 1256 from the Geosciences Department at the University of Texas at Dallas."en_US
dc.description.abstractMethods for extracting angle-domain common-image gathers (ADCIGs) during 2D reverse-time migration fall into three main categories; direction-vector-based methods, local-plane-wave decomposition methods, and local-shift imaging condition methods. The direction-vector-based methods, which use either amplitude gradients or phase gradients, cannot handle overlapping events because of an assumption of one propagation direction per imaging point per imaging time; however, the ADCIGs from the direction-vector-based methods have the highest angle resolution. A new direction-vector-based method using instantaneous phase gradients in space and time gives the same propagation directions and ADCIGs as those obtained by the Poynting vector or polarization vector based methods, where amplitudes are large. Angles calculated by the phase gradients have larger uncertainties at smaller amplitudes, but they do not significantly degrade the ADCIGs because they contribute only small amplitudes. The local-plane-wave decomposition and local-shift imaging condition methods, implemented either by a Fourier transform or by a slant stack transform, can handle overlapping events, and produce very similar angle gathers. ADCIGs from both methods depend on the local window size in which the transforms are done. In small local windows, both methods produce ADCIGs with low noise, but also with low angle resolution; in large windows, they have high angle resolution, but contain smeared artifacts.en_US
dc.description.sponsorshipen_US
dc.identifier.bibliographicCitationJin, Hu, George A. McMechan, and Huimin Guan. 2014. "Comparison of methods for extracting ADCIGs from RTM." Geophysics 79(3): S89-S103.en_US
dc.identifier.issn0016-8033en_US
dc.identifier.issue3en_US
dc.identifier.startpageS89en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/4151
dc.identifier.volume79en_US
dc.language.isoenen_US
dc.publisherSoc Exploration Geophysicistsen_US
dc.relation.urihttp://dx.doi.org/10.1190/GEO2013-0336.1
dc.rights©2014 Society of Exploration Geophysicistsen_US
dc.sourceGeophysics
dc.subjectAngle-Domain Common-Image Gathers (ADCIGs)en_US
dc.subjectWavefieldsen_US
dc.subjectGeophysicsen_US
dc.subjectReverse-Time Migration (RTM)en_US
dc.subjectLocal-Planewave Decomposition (LPWD)en_US
dc.titleComparison of Methods for Extracting ADCIGS from RTMen_US
dc.type.genreArticleen_US

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