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    Testing Gassmann fluid substitution in carbonates: sonic log versus ultrasonic core measurements

    152471_25518_Testing Gassmann fluid substitution in carbonates -sonic log versus ultrasonic core.pdf (504.5Kb)
    Access Status
    Open access
    Authors
    De Paula, Osni
    Pervukhina, M.
    Gurevich, Boris
    Date
    2010
    Type
    Conference Paper
    
    Metadata
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    Citation
    De Paula, Osni Bastos and Pervukhina, Marina and Gurevich, Boris. 2010. Testing Gassmann fluid substitution in carbonates: sonic log versus ultrasonic core measurements, SEG Denver 2010: Imaging our future, Oct 17 2010, pp. 2670-2674. Denver, Colorado: Society of Exploration Geophysicists.
    Source Title
    SEG Technical Program Expanded Abstracts
    Source Conference
    SEG Denver 2010: Imaging our future
    DOI
    10.1190/1.3513396
    ISSN
    1949-5552
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/21097
    Collection
    • Curtin Research Publications
    Abstract

    The technique of fluid substitution is widely used to model elastic properties of rocks saturated with different fluids The applicability of this technique to in-situ seismic and sonic measurements is a matter of frequent debate. Most of the analysis is based on laboratory measurements, with little or no constraints from field environments. In addition, until recently, most of the data were from sand reservoirs. Applicability of Gassmann fluid substitution to carbonates is even more uncertain. To analyze this problem, we compare elastic moduli obtained using fluid substitution against the moduli obtained from sonic and density logs The dry moduli for fluid substitution are obtained from ultrasonic measurements on 50 core samples from a cretaceous reservoir buried at 5000 meters depth in Santos Basin, offshore Brazil. The good agreement between the saturated moduli obtained from cores and logs is obtained. This shows that the Gassmann equations can be applied not only in siliciclastic reservoirs, but also deep and complex carbonates reservoirs.

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