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    The frequency exponent of artificial sandstone's complex resistivity spectrum

    Access Status
    Fulltext not available
    Authors
    Jia, Jiang
    Ke, S.
    Rezaee, Reza
    Li, J.
    Wu, F.
    Date
    2021
    Type
    Journal Article
    
    Metadata
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    Citation
    Jia, J. and Ke, S. and Rezaee, R. and Li, J. and Wu, F. 2021. The frequency exponent of artificial sandstone's complex resistivity spectrum. Geophysical Prospecting. 69 (4): pp. 856-871.
    Source Title
    Geophysical Prospecting
    DOI
    10.1111/1365-2478.13072
    ISSN
    0016-8025
    Faculty
    Faculty of Science and Engineering
    School
    WASM: Minerals, Energy and Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/89543
    Collection
    • Curtin Research Publications
    Abstract

    The complex resistivity spectra of 16 artificial sandstone samples with different physical property at different water and solution saturations were measured and fitted with the Cole–Cole model in the frequency band of 40 Hz to 110 MHz. The frequency exponent in the model indicates the ideal degree of the sample's capacitive property. The experimental result shows that the frequency exponents of the samples are concentrated mainly between 0.82 and 0.88 and present a segmented law that decreases first and then increases with decreasing the water saturation. The minimum frequency exponent has a linear relationship with porosity and cementation index and an exponential relationship with formation factors. The frequency exponent is expected to be used in the study of the oil–water distribution in the reservoir. The frequency exponents of the samples decrease with an increase in clay content. Frequency exponents are independent of the ion type in the solution. Numerical simulation results support that the capacitive property generated by the connected pore-throat spaces is near ideal, but the capacitive property contributed by the closed pore-throat spaces is non-ideal. This could be the possible reason why the frequency exponents of the samples are less than one. The pore-throats with higher capillary pressure can be blocked and become secondary closed pore-throat space during the flooding process and result in a decrease in frequency exponent. This can explain the influence of reservoir parameters on frequency exponent and can further clarify the physical significance of the Cole–Cole frequency exponent on the rock's complex resistivity.

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