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    Influence of microheterogeneity on effective stress law for elastic properties of rocks

    117582_8937_17CizSigginsGurevichDvorkin_Geophysics2008.pdf (324.0Kb)
    Access Status
    Open access
    Authors
    Ciz, Radim
    Siggins, A.
    Gurevich, Boris
    Dvorkin, J.
    Date
    2008
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Ciz, Radim and Siggins, A. and Gurevich, Boris and Dvorkin, J. 2008. Influence of microheterogeneity on effective stress law for elastic properties of rocks. Geophysics. 73 (1): pp. E7-E14.
    Source Title
    Geophysics
    DOI
    10.1190/1.2816667
    ISSN
    00168033
    Faculty
    Department of Exploration Geophysics
    Faculty of Science and Engineering
    The Western Australian School of Mines
    Remarks

    Published by the Society of Exploration Geophysicists.

    Copyright © 2008 Society of Exploration Geophysicists.

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

    URI
    http://hdl.handle.net/20.500.11937/37129
    Collection
    • Curtin Research Publications
    Abstract

    Understanding the effective stress coefficient for seismic velocity is important for geophysical applications such as overpressure prediction from seismic data as well as for hydrocarbon production and monitoring using time-lapse seismic measurements. This quantity is still not completely understood. Laboratory measurements show that the seismic velocities as a function of effective stress yield effective stress coefficients less than one and usually vary between 0.5 and 1. At the same time, theoretical analysis shows that for an idealized monomineral rock, the effective stress coefficient for elastic moduli (and therefore also for seismic velocities) will always equal one. We explore whether this deviation of the effective stress coefficient from unity can be caused by the spatial microheterogeneity of the rock. The results show that only a small amount (less than 1%) of a very soft component is sufficient to cause this effect. Such soft material may be present in grain contact areas of many rocks and may explain the variation observed experimentally.

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