Comparison of Methods for Extracting ADCIGS from RTM

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Comparison of Methods for Extracting ADCIGS from RTM

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title Comparison of Methods for Extracting ADCIGS from RTM
contributor.author Jin, Hu
contributor.author McMechan, George A.
contributor.author Guan, Huimin
contributor.sponsor Center for Lithospheric Studies
description "This paper is Contribution No. 1256 from the Geosciences Department at the University of Texas at Dallas."
description.abstract Methods 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.
description.sponsorship
identifier.citation Jin, Hu, George A. McMechan, and Huimin Guan. 2014. "Comparison of methods for extracting ADCIGs from RTM." Geophysics 79(3): S89-S103.
identifier.issn 0016-8033
identifier.uri http://hdl.handle.net/10735.1/4151
identifier.uri http://dx.doi.org/10.1190/GEO2013-0336.1
identifier.volume 79
identifier.issue 3
identifier.startpage S89
subject Angle-Domain Common-Image Gathers (ADCIGs)
subject Wavefields
subject Geophysics
subject Reverse-Time Migration (RTM)
subject Local-Planewave Decomposition (LPWD)
date.issued 2014-04-01
publisher Soc Exploration Geophysicists
rights ©2014 Society of Exploration Geophysicists
rights.holder ©2014 Society of Exploration Geophysicists
language.iso en
source.journal Geophysics

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