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    Effect of fluid on wave propagation in weakly anisotropic porous media

    Access Status
    Fulltext not available
    Authors
    Collet, O.
    Gurevich, Boris
    Date
    2013
    Type
    Conference Paper
    
    Metadata
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    Citation
    Collet, O. and Gurevich, B. 2013. Effect of fluid on wave propagation in weakly anisotropic porous media, in American Society of Civil Engineers (ed), Proceedings of the 5th BIOT Conference of Poromechanics, Jul 10-12 2013, pp. 227-234. Vienna: American Society of Civil Engineers.
    Source Title
    Poromechanics V: Proceedings of the Fifth Biot Conference on Poromechanics
    Source Conference
    5th BIOT Conference on Poromechanics
    DOI
    10.1061/9780784412992.026
    ISBN
    978-0-7844-1299-2
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/36755
    Collection
    • Curtin Research Publications
    Abstract

    Predicting seismic velocities in isotropic fluid-saturated rocks is commonly done using the isotropic Biot-Gassmann theory. For anisotropic media, the Biot-Gassmann solution is expressed in terms of stiffness or compliance, which does not provide an intuitive understanding on the impact of fluid on anisotropy. To analyse how the pore fluid affects wave propagation in weakly anisotropic media, we rederived these expressions in terms of dimensionless anisotropy parameters. Besides, we study the effect of fluid on two anisotropy patterns, the one caused by aligned fractures embedded in an isotropic porous background and the stress-induced anisotropy pattern. By deriving an approximation of the anellipticity parameter η, we show that if the dry medium is elliptical, the saturated medium is also elliptical but only if the porosity is not too small. This result can provide a way of differentiating between stress- and fracture-induced anisotropy.

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