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Interpretation of phase reversals in seismic reflections from attenuating targets

Wu, Xiaoyang; Chapman, Mark; Angerer, Erika. 2014 Interpretation of phase reversals in seismic reflections from attenuating targets. Geophysical Journal International, 200 (1). 690-697. https://doi.org/10.1093/gji/ggu426

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This is a pre-copyedited, author-produced PDF of an article accepted for publication in Geophysical Journal International following peer review. The version of record is available online at: http://gji.oxfordjournals.org/content/200/1/690
gjixyw.pdf - Accepted Version

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Abstract/Summary

Phase reversals are commonly observed during exploration seismic amplitude-versus-offset analysis, and usually modelled with the Zoeppritz equations. In practice, when multiple fluids are present we often deal with reflections from interfaces having a contrast in both elastic and anelastic properties. In this paper, we present a new phenomenological model for phase reversals in cases in which velocity dispersion and attenuation are present. We demonstrate strong qualitative differences in behaviour between the elastic and anelastic cases, influencing both the amplitude and phase of the reflection coefficient. Analysis of seismic data showing a phase reversal from a gas reservoir in the Vienna basin shows a striking agreement with the modelling. We conclude that the influence of fluid-induced dispersion on reflection data is a significant and measurable phenomenon in cases of practical interest, that recognition of the phenomena may be used as a novel fluid indicator and that frequency-dependent rock physics analysis may be an important tool for both industrial geophysics and seismic monitoring of CO2 storage.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.1093/gji/ggu426
ISSN: 0956-540X
Additional Keywords: Phase reversal; Frequency domain; Rock physics; Seismic exploration
Date made live: 16 Dec 2014 14:10 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/509103

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