Waveform tomography of two-dimensional three-component seismic data for HTI anisotropic media

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Title: Waveform tomography of two-dimensional three-component seismic data for HTI anisotropic media
Authors: Gao, F
Wang, Y
Wang, Y
Item Type: Journal Article
Abstract: Reservoirs with vertically aligned fractures can be represented equivalently by HTI (horizontal transverse isotropy) media. But inverting for the anisotropic parameters of HTI media is a challenging inverse problem, because of difficulties inherent in a multiple parameter inversion. In this paper, when we invert for the anisotropic parameters, we consider for the first time the azimuthal rotation of a two-dimensional seismic survey line from the symmetry of HTI. The established wave equations for the HTI media with azimuthal rotation consist of nine elastic coefficients, expressed in terms of five modified Thomsen parameters. The latter are parallel to the Thomsen parameters for describing velocity characteristics of weak VTI (vertical transverse isotropy) media. We analyze the sensitivity differences of the five modified Thomsen parameters from their radiation patterns, and attempt to balance the magnitude and sensitivity differences between the parameters through normalization and tuning factors which help to update the model parameters properly. We demonstrate an effective inversion strategy by inverting velocity parameters in the first stage and updates the five modified Thomsen parameters simultaneously in the second stage, for generating reliably reconstructed models.
Issue Date: 7-Jun-2018
Date of Acceptance: 11-May-2018
URI: http://hdl.handle.net/10044/1/60039
DOI: https://dx.doi.org/10.1007/s00024-018-1904-z
ISSN: 0033-4553
Publisher: Springer Verlag
Journal / Book Title: Pure and Applied Geophysics
Copyright Statement: © Springer International Publishing AG, part of Springer Nature 2018. The final publication is available at Springer via https://link.springer.com/article/10.1007/s00024-018-1904-z
Keywords: 0404 Geophysics
Geochemistry & Geophysics
Publication Status: Published online
Embargo Date: 2019-06-07
Online Publication Date: 2018-06-07
Appears in Collections:Faculty of Engineering
Earth Science and Engineering



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