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    P-wave dispersion and attenuation due to scattering by aligned fluid saturated fractures with finite thickness: Theory and experiment

    72292.pdf (1.563Mb)
    Access Status
    Open access
    Authors
    Guo, J.
    Shuai, D.
    Wei, J.
    Ding, P.
    Gurevich, Boris
    Date
    2018
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Guo, J. and Shuai, D. and Wei, J. and Ding, P. and Gurevich, B. 2018. P-wave dispersion and attenuation due to scattering by aligned fluid saturated fractures with finite thickness: Theory and experiment. Geophysical Journal International. 215 (3): pp. 2114-2133.
    Source Title
    Geophysical Journal International
    DOI
    10.1093/gji/ggy406
    ISSN
    0956-540X
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    Remarks

    This article has been accepted for publication in Geophysical Journal International ©: The Author(s) 2018. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/72049
    Collection
    • Curtin Research Publications
    Abstract

    Fractures often play an important role in controlling the fluid flow in hydrocarbon reservoirs. When the seismic wave propagates through media containing fracture corridors, significant scattering dispersion and attenuation can occur. In this work, we study the P-wave dispersion and attenuation due to the scattering caused by 2-D fluid-saturated aligned fractures with finite thickness, which are embedded in an isotropic elastic background medium. Using the Foldy approximation and the representation theorem, the P-wave dispersion and attenuation are related to the displacement discontinuities across the fractures. These fracture displacement discontinuities are obtained from the boundary conditions and the P-wave dispersion and attenuation can thus be calculated. A numerical example shows that the fracture thickness has significant influence on the dispersion and attenuation, especially in the low-frequency regime when the fracture size is smaller than the seismic wavelength. The effects of the fluid bulk modulus are also significant,which are opposite to those of the fracture thickness. However, the effect of the fluid viscosity is found to be negligible for the studied configurations. To validate the proposed model, the theoretical predictions are compared with ultrasonic measurements on fractured samples. The comparison shows overall good agreement between theory and experiment. This work reveals the important influence of fracture thickness and saturating fluid properties on the P-wave scattering dispersion and attenuation. Hence, it shows a potential to extract these parameters from seismic data.

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