Nonlinear estimation of thomsen anisotropy parameters in TI media

Dariush Nadri; Anderj Bóna; Milovan Urosevic

doi:10.1071/ASEG2009ab030

ISSN: 2202-0586
E-ISSN:

oa Nonlinear estimation of thomsen anisotropy parameters in TI media
Authors Dariush Nadri^a, Anderj Bóna^b and Milovan Urosevic^c
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^a CSIRO, , [email protected] ^b Curtin University of Technology, , [email protected] ^c Curtin University of Technology, , [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2009, Issue ASEG2009 - 20th Geophysical Conference, Dec 2009, p. 1 - 9
DOI: https://doi.org/10.1071/ASEG2009ab030
- Published online: 01 Dec 2009

Abstract

Introduction

Transverse isotropy with the horizontal axis of symmetry (HTI) is the simplest anisotropic model to characterize a geological formation with vertical fractures. We formulate an azimuthally dependent parametric equation for P-wave traveltimes in a layered HTI medium. Also, assuming a known vertical velocity model, we estimate simultaneously the fracture orientation and Thomsen’s anisotropy parameters in a stack of horizontal layers using a modified preconditioning conjugate gradient algorithm. In a numerical example, we show that in the context of weak anisotropy, Thomsen’s anisotropy parameters ( δ and ε ) and fracture orientation can be efficiently estimated using the P-wave traveltimes without a prior information.

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References

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Ur sin, B., Hokstad, K., 2003, Geometrical spreading in a layered transversely isotropic medium with vertical symmetry axis: Geophysics, 68, 2082-2091.
Ur sin, B., Stovas, A., 2006, Traveltime approximations for a layered transversely isotropic medium: Geophysics, 71, D23-D33.

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Article Type: Research Article

Keyword(s): Inverse Modelling; Preconditioning Conjugate Gradient; Thomsen Parameters; TI Anisotropy; Traveltime Inversion

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oa Nonlinear estimation of thomsen anisotropy parameters in TI media

Abstract

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