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Book Chapter

Anisotropy: Seismic anisotropy in exploration and reservoir characterization: An overview

By
Ilya Tsvankin
Ilya Tsvankin
1Colorado School of Mines, Department of Geophysics, Center for Wave Phenomena, Golden, Colorado, U.S.A. E-mail: ilya@dix.mines.edu.
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James Gaiser
James Gaiser
2Geokinetics, Denver, Colorado, U.S.A. E-mail: jim.gaiser@geokinetics.com.
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Vladimir Grechka
Vladimir Grechka
3Shell Exploration & Production Company, Houston, Texas, U.S.A. E-mail: Vladimir.Grechka@Shell.com.
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Mirko van der Baan
Mirko van der Baan
4University of Alberta, Department of Physics, Edmonton, Alberta, Canada. E-mail: Mirko.vanderBaan@ualberta.ca.
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Leon Thomsen
Leon Thomsen
5Delta Geophysics, Houston, Texas, U.S.A. E-mail: leon.thomsen@deltageophysics.net.
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Published:
January 01, 2010

Abstract

Recent advances in parameter estimation and seismic processing have allowed incorporation of anisotropic models into a wide range of seismic methods. In particular, vertical and tilted transverse isotropy are currently treated as an integral part of velocity fields employed in prestack depth migration algorithms, especially those based on the wave equation. We briefly review the state of the art in modeling, processing, and inversion of seismic data for anisotropic media. Topics include optimal parameterization, body-wave modeling methods, P-wave velocity analysis and imaging, processing in the τ-p domain, anisotropy estimation from vertical-seismic-profiling (VSP) surveys, moveout inversion of wide-azimuth data, amplitude-variation-with-offset (AVO) analysis, processing and applications of shear and mode-converted waves, and fracture characterization. When outlining future trends in anisotropy studies, we emphasize that continued progress in data-acquisition technology is likely to spur transition from transverse isotropy to lower anisotropic symmetries (e.g., orthorhombic). Further development of inversion and processing methods for such realistic anisotropic models should facilitate effective application of anisotropy parameters in lithology discrimination, fracture detection, and time-lapse seismology.

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Contents

Geophysical References Series

Geophysics Today: A Survey of the Field as the Journal Celebrates its 75th Anniversary

Sergey Fomel
Sergey Fomel
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Society of Exploration Geophysicists
Volume
16
ISBN electronic:
9781560802273
Publication date:
January 01, 2010

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