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    Effects of Fracture Intersections on Seismic Dispersion - Theoretical Predictions Versus Numerical Simulations

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    Fulltext not available
    Authors
    Guo
    Rubino, G.
    Gurevich, Boris
    Glubokovskikh, Stanislav
    Dyskin, A.
    Paternak, E.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Guo and Rubino, G. and Gurevich, B. and Glubokovskikh, S. and Dyskin, A. and Paternak, E. 2017. Effects of Fracture Intersections on Seismic Dispersion - Theoretical Predictions Versus Numerical Simulations. Geophysical Prospecting. 65 (5): pp. 1264-1276.
    Source Title
    Geophysical Prospecting
    DOI
    10.1111/1365-2478.12474
    ISSN
    0016-8025
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/56949
    Collection
    • Curtin Research Publications
    Abstract

    The detection and characterisation of domains of intersecting fractures are important goals in several disciplines of current interest, including exploration and production of unconventional reservoirs, nuclear waste storage, CO2 sequestration, and groundwater hydrology, among others. The objective of this study is to propose a theoretical framework for quantifying the effects of fracture intersections on the frequency-dependent elastic properties of fluid-saturated porous and fractured rocks. Three characteristic frequency regimes for fluid pressure communication are identified. In the low-frequency limit, fractures are in full pressure communication with the embedding porous matrix and with other fractures. Conversely, in the high-frequency limit, fractures are hydraulically isolated from the matrix and from other fractures. At intermediate frequencies, fractures are hydraulically isolated from the matrix porosity but can be in hydraulic communication with each other, depending on whether fracture sets are intersecting. For each frequency regime, the effective stiffness coefficients are derived using the linear-slip theory and anisotropic Gassmann equations. Explicit mathematical expressions for the two characteristic frequencies that separate the three frequency regimes are also determined. Theoretical predictions are then applied to two synthetic 2D samples, each containing two orthogonal fracture sets: one with and another without intersections. The resulting stiffness coefficients, Thomsen-style anisotropy parameters, and the transition frequencies show good agreement with corresponding numerical simulations. The theoretical results are applicable not only to 2D but also to 3D fracture systems and are amenable to being employed in inversion schemes designed to characterise fracture systems.

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    • Effects of fracture intersections on seismic dispersion: theoretical predictions versus numerical simulations
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      The detection and characterisation of domains of intersecting fractures are important goals in several disciplines of current interest, including exploration and production of unconventional reservoirs, nuclear waste ...
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      Guo, J.; Rubino, J.; Barbosa, N.; Glubokovskikh, Stanislav; Gurevich, Boris (2018)
      When a seismic wave travels through a fluid-saturated porous reservoir containing aligned fractures, it induces oscillatory fluid flow between the fractures and the embedding background medium. Although there are numerous ...
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      Numerous theoretical models have been proposed for computing seismic wave dispersion and attenuation in rocks with aligned fractures due to wave-induced fluid flow between the fractures and the embedding background. ...
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