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    Role of compliant porosity in stress dependency of ultrasonic velocities in carbonates and sandstones

    Access Status
    Fulltext not available
    Authors
    De Paula, Osni
    Pervukhina, M.
    Gurevich, Boris
    Date
    2008
    Type
    Conference Paper
    
    Metadata
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    Citation
    De Paula, Osni and Pervukhina, Marina and Gurevich, Boris. 2008. Role of compliant porosity in stress dependency of ultrasonic velocities in carbonates and sandstones, in Brazilian Geophysical Society (ed), III Simposio Brasileiro de Geofisica, Nov 26 2008. Brazil: SBGf.
    Source Title
    SBGf Brazilian Geophysical Society
    Source Conference
    III Simposio Brasileiro de Geofisica
    ISBN
    9788588690134
    Faculty
    Department of Exploration Geophysics
    Faculty of Science and Engineering
    WA School of Mines
    URI
    http://hdl.handle.net/20.500.11937/44617
    Collection
    • Curtin Research Publications
    Abstract

    A study of complex dual-nature porosity of reservoir rocks is necessary for quantitative understanding of seismic wave propagation in reservoirs. We analyze here the ratios of stiff and compliant porosities in 6 samples of carbonates and 6 samples of sandstones, and effect of compliant porosity on ultrasonic shear and compressional wave velocities measured at effective stresses from 0 to 60 MPa. The compliant porosity is estimated from stress dependency of dry rock compressibility using isotropic Shapiro theory (2003). In the case of sandstones, we have direct measurements of porosity variations with pressure whichvalidate the estimated compliant porosities. Finally, we use Gassmann equations to estimate the stress dependence of shear and compressional wave velocitiesin saturated rocks. Two examples discussed here show that a better estimation is obtained using the high frequency unrelaxed frame shear and bulk modulus(Mavko&Jizzba,1991) to “saturate” the samples.

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