Common-Reflection-Point Migration Velocity Analysis of 2D P-Wave Data From TTI Media

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Common-Reflection-Point Migration Velocity Analysis of 2D P-Wave Data From TTI Media

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title Common-Reflection-Point Migration Velocity Analysis of 2D P-Wave Data From TTI Media
contributor.author Oropeza, Ernesto V.
contributor.author McMechan, George A.
contributor.sponsor Center for Lithospheric Studies
description.abstract We have developed a common-reflection-point (CRP)-based kinematic migration velocity analysis for 2D P-wave reflection data to estimate the four transversely isotropic (TI) parameters VPo, δ, and ε, and the tilt angle ϕ of the symmetry axis in a TI medium. In each iteration, the tomographic parameter was updated alternately with prestack anisotropic ray-based migration. Iterations initially used layer stripping to reduce the number of degrees of freedom; after convergence was reached, a couple of more iterations over all parameters and all CRPs ensured global interlayer coupling and parameter interaction. The TI symmetry axis orientation was constrained to be locally perpendicular to the reflectors. The VPo dominated the inversion, and so it was weighted less than δ and ε in the parameter updates. Estimates of δ and ε were influenced if the error in ϕ was >5⁰ estimates of VPo were also influenced if the error in ϕ was >10⁰. Examples included data for a simple model with a homogeneous TI layer whose dips allowed recovery of all anisotropy parameters from noise-free data, and a more realistic model (the BP tilted transversely isotropic (TTI) model) for which only VPo, delta, and ϕ were recoverable. The adequacy of the traveltimes predicted by the inverted anisotropic models was tested by comparing migrated images and common image gathers, with those produced using the known velocity models.
identifier "This paper is contribution no. 1258 from the Department of Geosciences at the University of Texas at Dallas."
identifier.citation Oropeza, Ernesto V., and George A. McMechan. 2014. "Common-reflection-point migration velocity analysis of 2D P-wave data from TTI media." Geophysics 79(3): 65-C79.
identifier.issn 0016-8033
identifier.uri http://hdl.handle.net/10735.1/4238
identifier.uri http://dx.doi.org/10.1190/GEO2013-0295.1
identifier.volume 79
identifier.issue 3
identifier.startpage 65
subject Common reflection point (CRP)
subject Anistrophy
subject Velocity
subject Inversion (Geophysics)
subject Seismic waves—Data processing
date.issued 2014-05
publisher Soc Exploration Geophysicists
rights ©2014 Society of Exploration Geophysicists
rights.holder Society of Exploration Geophysicists
language.iso en
source.journal Geophysics

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