Inversion for Thomsen’s anisotropy parameters

Pavan Elapavuluri; John Bancroft

doi:10.1071/ASEG2004ab039

ISSN: 2202-0586
E-ISSN:

oa Inversion for Thomsen’s anisotropy parameters
Authors Pavan Elapavuluri^a and John Bancroft^b
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^a University of Calgary, , CREWES [email protected] ^b University of Calgary, , CREWES [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2004, Issue ASEG2004 - 17th Geophysical Conference, Dec 2004, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2004ab039
- Published online: 01 Dec 2004

Abstract

In order to extend seismic processing techniques to anisotropic media, it is required that we have a measure of the different anisotropy parameters.

The purpose of this study is to estimate the Thomsen’s parameters, µ and ´, for transversely isotropic (TI) media using the shifted hyperbola NMO equation by Castle.

A non-linear inversion technique has been developed to invert the Castle’s Shifted Hyperbola NMO Equation for obtaining the shift parameter.

This method will be used for the estimation of these parameters over the Blackfoot field in western Canada.

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References

Bancroft, J.C., 1996, Velocity sensitivity for equivalent offset prestack migration, Ann. Mtg: Can. Soc. of Exp. Geophys.
Bancroft, J.C., Geiger, H.D. and Margrave, G.F, 1998, The equivalent offset method of prestack time migration: Geophysics, Soc. Of Exp. Geophys., 63, 2041-2053.
Castle, R.J., 1994, Theory of normal moveout: Geophysics, Soc. Of Exp. Geophys., 59, 983-999.
Dix, C.H., 1955, Seismic velocities from surface measurements: Geophysics, Soc. Of Exp. Geophys., 20, 68-86.
Elapavuluri, P., and Bancroft, J.C., 2002, Estimation of anisotropy parameters using shifted hyperbola NMO equation, 64th Ann. Mtg: EAGE.
Taner, M.T. and Koehler, F., 1969, Velocity spectra - Digital computer derivation and applications of velocity functions, Geophysics, Soc. Of Exp. Geophys., 34, 859-881.
Haase, A. B., 1998, Non hyperbolic moveout in plains data and the anisotropy question: Recorder, Can. Soc. of Exp Geophys. Nov, 1998,21-33.
Miller, S.L.M., Aydemir, E.O. and Margrave, G.F., 1995, Preliminary interpretation of P-P and P-S seismic data from Blackfoot broad-band survey: CREWES Research Report 1995, Ch 42.
Thomsen, L., 1986, Weak elastic anisotropy: Geophysics, Soc. Of Exp. Geophys., 51, 1954-1966.
Tsvankin, I. and Thomsen, L., 1994, Nonhyperbolic reflection moveout in anisotropic media: Geophysics, Soc. Of Exp. Geophys., 59, 1290-1304.

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Article Type: Research Article

Keyword(s): Anisotropy; shifted hyperbola; Thomsen’s parameters; velocity analysis

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oa Inversion for Thomsen’s anisotropy parameters

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