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    Estimation of the anisotropy parameters of transversely isotropic shales with a tilted symmetry axis

    Access Status
    Open access via publisher
    Authors
    Nadri, D.
    Sarout, J.
    Bona, Andrej
    Dewhurst, D.
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Nadri, Dariush and Sarout, Joel and Bona, Andrej and Dewhurst, David. 2012. Estimation of the anisotropy parameters of transversely isotropic shales with a tilted symmetry axis. Geophysical Journal International. 190 (2): pp. 1197-1203.
    Source Title
    Geophysical Journal International
    DOI
    10.1111/j.1365-246X.2012.05545.x
    ISSN
    0956-540X
    URI
    http://hdl.handle.net/20.500.11937/15265
    Collection
    • Curtin Research Publications
    Abstract

    This paper reports a new approach for the estimation of Thomsen anisotropy parameters and symmetry axis orientation from ultrasonic P-wave traveltime measurements on transversely isotropic shale samples of arbitrary geometry. This approach can be used for core samples cut in any direction with respect to the bedding plane, because no a priori assumption regarding the symmetry axis orientation is made. This orientation is rather part of the solution of the inverse problem together with the anisotropy parameters themselves. Very fast simulated reannealing is used to search for the best possible estimate of the model parameters. The methodology is applied to spherical and cylindrical anisotropic shale samples.

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