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    Ultrasonic moduli for fluid-saturated rocks: Mavko-Jizba relations rederived and generalized

    132515_13154_020GurevichMakarynskaPervukhina.pdf (118.4Kb)
    Access Status
    Open access
    Authors
    Gurevich, Boris
    Makarynska, D
    Pervukhina, M.
    Date
    2009
    Type
    Journal Article
    
    Metadata
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    Citation
    Gurevich, Boris and Makarynska, Dina and Pervukhina, Marina. 2009. Ultrasonic moduli for fluid-saturated rocks: Mavko-Jizba relations rederived and generalized. Geophysics. 74 (4): pp. 25-30.
    Source Title
    Geophysics
    DOI
    10.1190/1.3123802
    ISSN
    00168033
    School
    Department of Exploration Geophysics
    Remarks

    Published by the Society of Exploration Geophysicists

    © 2009 Society of Exploration Geophysicists

    The link to the journal’s home page is at : http://segdl.org/geophysics/

    URI
    http://hdl.handle.net/20.500.11937/38956
    Collection
    • Curtin Research Publications
    Abstract

    Mavko and Jizba propose a quantitative model for squirt dispersion of elastic-wave velocities between seismic and ultrasonic frequencies in granular rocks. Their central results are the expressions for the so-called unrelaxed frame bulk and shear moduli computed under an assumption that the stiff pores are drained (or dry) but the soft pores are filled with fluid. Mavko-Jizba expressions are limited to liquid-saturated rocks but become inaccurate when the fluid-bulk modulus is small (e.g., for gas-saturated rocks). We have derived new expressions for unrelaxed moduli of fluid-saturated porous rocks using Sayers-Kachanov discontinuity formalism. The derived expressions generalize the established Mavko-Jizba relations to gas-saturated rocks, reduce to Mavko-Jizba results when the pore fluid is liquid, and yield dry moduli when fluid-bulk modulus tends to zero. We tested this by comparing our model and the model of Mavko and Jizba against laboratory measurements on a sample of Westerly granite.

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