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    Parameterization of elastic stress sensitivity in shales

    172736_36382_Parameterization of elastic stress sensitivity in shales.pdf (653.6Kb)
    Access Status
    Open access
    Authors
    Pervukhina, M.
    Gurevich, Boris
    Golodoniuc, Pavel
    Dewhurst, D.
    Date
    2011
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Pervukhina, Marina and Gurevich, Boris and Golodoniuc, Pavel and Dewhurst, David N. 2011. Parameterization of elastic stress sensitivity in shales. Geophysics 76 (3): pp. WA147-WA155.
    Source Title
    Geophysics
    DOI
    10.1190/1.3554401
    ISSN
    0016-8033
    School
    Department of Exploration Geophysics
    Remarks

    Copyright © 2011 Society of Exploration Geophysicists.

    URI
    http://hdl.handle.net/20.500.11937/16139
    Collection
    • Curtin Research Publications
    Abstract

    Stress dependency and anisotropy of dynamic elastic properties of shales is important for a number of geophysical applications, including seismic interpretation, fluid identification, and 4D seismic monitoring. Using Sayers-Kachanov formalism, we developed a new model for transversely isotropic (TI) media that describes stress sensitivity behavior of all five elastic coefficients using four physically meaningful parameters. The model is used to parameterize elastic properties of about 20 shales obtained from laboratory measurements and the literature. The four fitting parameters, namely, specific tangential compliance of a single crack, ratio of normal to tangential compliances, characteristic pressure, and crack orientation anisotropy parameter, show moderate to good correlations with the depth from which the shale was extracted. With increasing depth, the tangential compliance exponentially decreases. The crack orientation anisotropy parameter broadly increases with depth for most of the shales, indicating that cracks are getting more aligned in the bedding plane. The ratio of normal to shear compliance and characteristic pressure decreases with depth to 2500 m and then increases below this to 3600 m.This may allow the reconstruction of the stress dependency of all five elastic compliances of a shale from log data, for example.

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      Stress dependency of full elastic tensor of shales is very important for seismic interpretation, overpressure prediction, 4D monitoring, etc. Using Sayers-Kachanov formalism, we develop a new stress sensitivity model for ...
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