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    Linking the pressure dependency of elastic and electrical properties of porous rocks by a dual porosity model

    Access Status
    Open access via publisher
    Authors
    Han, T.
    Gurevich, Boris
    Pervukhina, M.
    Clennell, M.
    Zhang, J.
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Han, T. and Gurevich, B. and Pervukhina, M. and Clennell, M. and Zhang, J. 2016. Linking the pressure dependency of elastic and electrical properties of porous rocks by a dual porosity model. Geophysical Journal International. 205 (1): pp. 378-388.
    Source Title
    Geophysical Journal International
    DOI
    10.1093/gji/ggw019
    ISSN
    0956-540X
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/32809
    Collection
    • Curtin Research Publications
    Abstract

    Knowledge about the pressure dependency of elastic and electrical properties is important for a variety of geophysical applications. We present a technique to invert for the stiff and compliant porosity from velocity measurements made as a function of differential pressure on saturated sandstones. A dual porosity concept is used for dry rock compressibility and a squirt model is employed for the pressure and frequency dependent elastic properties of the rocks when saturated. The total porosity obtained from inversion shows satisfactory agreement with experimental results. The electrical cementation factor was determined using the inverted porosity in combination with measured electrical conductivity. It was found that cementation factor increased exponentially with increasing differential pressure during isostatic loading. Elastic compressibility, electrical cementation factor and electrical conductivity of the saturated rocks correlate linearly with compliant porosity, and electrical cementation factor and electrical conductivity exhibit linear correlations with elastic compressibility of the saturated rocks under loading. The results show that the dual porosity concept is sufficient to explain the pressure dependency of elastic, electrical and joint elastic-electrical properties of saturated porous sandstones.

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