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    Fluid substitution in heavy oil rocks

    117639_8946_16MakarynskaGurevich_SEG2008.pdf (221.1Kb)
    Access Status
    Open access
    Authors
    Makarynska, Dina
    Gurevich, Boris
    Date
    2008
    Type
    Conference Paper
    
    Metadata
    Show full item record
    Citation
    Makarynska, DIna and Gurevich, Boris. 2008. Fluid substitution in heavy oil rocks, in Society of Exploration Geophysicists. (ed), 78th Annual SEG Meeting, Nov 9 2008, pp. 1699-1703. Las Vegas, USA: Society of Exploration Geophysics.
    Source Title
    Society of Exploration Geophysicists SEG, Las Vegas 2008 Annual Meeting
    Source Conference
    78th Annual SEG Meeting
    DOI
    10.1190/1.3059235
    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/20.500.11937/4460
    Collection
    • Curtin Research Publications
    Abstract

    Heavy oils are defined as having high densities and extremely high viscosities. Due to their viscoelastic behavior the traditional rock physics based on Gassmann theory becomes inapplicable. In this paper, we use effective-medium approach known as coherent potential approximation or CPA as an alternative fluid substitution scheme for rocks saturated with viscoelastic fluids. Such rocks are modelled as solids with elliptical fluid inclusions when fluid concentration is small and as suspensions of solid particles in the fluid when the solid concentration is small. This approach is consistent with concepts of percolation and critical porosity, and allows one to model both sandstones and unconsolidated sands. We test the approach against known solutions. First, we apply CPA to fluid-solid mixtures and compare the obtained estimates with Gassmann results. Second, we compare CPA predictions for solid-solid mixtures with numerical simulations. Good match between the results confirms the applicability of the CPA scheme. We extend the scheme to predict the effective frequency- and temperature-dependent properties of heavy oil rocks. CPA scheme reproduces frequency-dependent attenuation and dispersion which are qualitatively consistent with laboratory measurements and numerical simulations. This confirms that the proposed scheme provides realistic estimates of the properties of rocks saturated with heavy oil.

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      Copyright © (2008) by the Society of Exploration Geophysicists All rights reserved. Heavy oils are defined as having high densities and extremely high viscosities. Due to their viscoelastic behavior the traditional rock ...
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