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    Time-lapse sonic logs reveal patchy CO2 saturation in-situ

    172799_39262_Time-lapse sonic logs reveal patchy C02 saturation.pdf (278.6Kb)
    Access Status
    Open access
    Authors
    Caspari, Eva
    Müller, T.
    Gurevich, Boris
    Date
    2011
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Caspari, E. and Müller, T.M. and Gurevich, B. 2011. Time-lapse sonic logs reveal patchy CO2 saturation in-situ. Geophysical Research Letters. 38 (L13301).
    Source Title
    Geophysical Research Letters
    DOI
    10.1029/2011GL046959
    ISSN
    0094-8276
    School
    Department of Exploration Geophysics
    Remarks

    Copyright © 2011 The American Geophysical Union

    URI
    http://hdl.handle.net/20.500.11937/21086
    Collection
    • Curtin Research Publications
    Abstract

    Based on time-lapse sonic and neutron porosity logs from the Nagaoka CO2 sequestration experiment, a P-wave velocity-saturation relation at reservoir depth is retrieved. It does not coincide with either of the end-member models of uniform and patchy saturation but falls in between even if realistic error estimates for the host rock properties are considered. Assuming a random distribution of CO2 patches it is shown that the mechanism of wave-induced flow can be evoked to explain this velocity-saturation relation. Characteristic CO2 patch size estimates range from 1 to 5 mm. Such mesoscopic heterogeneity can be responsible for attenuation and dispersion in the well logging frequency band.

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