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    Testing Gassmann fluid substitution: sonic logs versus ultrasonic core measurements

    Access Status
    Fulltext not available
    Authors
    Grochau, Marcos
    Gurevich, Boris
    Date
    2009
    Type
    Journal Article
    
    Metadata
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    Citation
    Grochau, Marcos and Gurevich, Boris. 2009. Testing Gassmann fluid substitution: sonic logs versus ultrasonic core measurements. Geophysical Prospecting. 57: pp. 75-79.
    Source Title
    Geophysical Prospecting
    DOI
    10.1111/j.1365-2478.2008.00726.x
    ISSN
    00168025
    Faculty
    Department of Exploration Geophysics
    Faculty of Science and Engineering
    WA School of Mines
    Remarks

    Copyright © 2010 John Wiley & Sons, Ltd.

    URI
    http://hdl.handle.net/20.500.11937/43255
    Collection
    • Curtin Research Publications
    Abstract

    Although Gassmann fluid substitution is standard practice for time-lapse studies, its validity in the field environment rests upon a number of underlying assumptions. The impact of violation on the predictions of Gassmann equations can only ultimately be validated by in situ testing in real geological environments. In this paper we show a workflow that we developed to test Gassmann fluid substitution by comparing saturated P-wave moduli computed from dry core measurements against those obtained from sonic and density logs. The workflow has been tested on 43 samples taken from a 45 m turbidite reservoir from the Campos Basin, offshore Brazil. The results show good statistical agreement between the P-wave elastic moduli computed from cores using the Gassmann equation with the corresponding moduli computed from log data. This confirms that all the assumptions of the Gassmann are adequate within the measurement error and natural variability of elastic properties. These results provide further justification for using the Gassmann theory to interpret time-lapse effects in this sandstone reservoir and in similar geological formations.

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