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    Gassmann Theory Applies to Nanoporous Media

    Access Status
    Fulltext not available
    Authors
    Gor, G.
    Gurevich, Boris
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Gor, G. and Gurevich, B. 2018. Gassmann Theory Applies to Nanoporous Media. Geophysical Research Letters. 45 (1): pp. 146-155.
    Source Title
    Geophysical Research Letters
    DOI
    10.1002/2017GL075321
    ISSN
    0094-8276
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    Remarks

    Copyright © 2017 The American Geophysical Union

    URI
    http://hdl.handle.net/20.500.11937/66410
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 American Geophysical Union. All Rights Reserved. Recent progress in extraction of unconventional hydrocarbon resources has ignited the interest in the studies of nanoporous media. Since many thermodynamic and mechanical properties of nanoscale solids and fluids differ from the analogous bulk materials, it is not obvious whether wave propagation in nanoporous media can be described using the same framework as in macroporous media. Here we test the validity of Gassmann equation using two published sets of ultrasonic measurements for a model nanoporous medium, Vycor glass, saturated with two different fluids, argon, and n-hexane. Predictions of the Gassmann theory depend on the bulk and shear moduli of the dry samples, which are known from ultrasonic measurements and the bulk moduli of the solid and fluid constituents. The solid bulk modulus can be estimated from adsorption-induced deformation or from elastic effective medium theory. The fluid modulus can be calculated according to the Tait-Murnaghan equation at the solvation pressure in the pore. Substitution of these parameters into the Gassmann equation provides predictions consistent with measured data. Our findings set up a theoretical framework for investigation of fluid-saturated nanoporous media using ultrasonic elastic wave propagation.

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