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A model for strong attenuation and dispersion of seismic P-waves in a partially saturated fractured reservoir

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  • Special Topics on Reservoir Acoustics
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Abstract

In this work we interpret the data showing unusually strong velocity dispersion of P-waves (up to 30%) and attenuation in a relatively narrow frequency range. The cross-hole and VSP data were measured in a reservoir, which is in the porous zone of the Silurian Kankakee Limestone Formation formed by vertical fractures within a porous matrix saturated by oil, and gas patches. Such a medium exhibits significant attenuation due to wave-induced fluid flow across the interfaces between different types of inclusions (fractures, fluid patches) and background. Other models of intrinsic attenuation (in particular squirt flow models) cannot explain the amount of observed dispersion when using realistic rock properties. In order to interpret data in a satisfactory way we develop a superposition model for fractured porous rocks accounting also for the patchy saturation effect.

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Authors and Affiliations

  1. Department of Exploration Geophysics, Curtin University of Technology, Perth, Australia

    Miroslav Brajanovski

  2. Geophysical Institute, University of Karlsruhe, Karlsruhe, Germany

    Tobias M. Müller

  3. Southwest Research Institute, San Antonio, USA

    Jorge O. Parra

Authors
  1. Miroslav Brajanovski
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  2. Tobias M. Müller
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  3. Jorge O. Parra
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Corresponding author

Correspondence to Miroslav Brajanovski.

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Brajanovski, M., Müller, T.M. & Parra, J.O. A model for strong attenuation and dispersion of seismic P-waves in a partially saturated fractured reservoir. Sci. China Phys. Mech. Astron. 53, 1383–1387 (2010). https://doi.org/10.1007/s11433-010-3205-0

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  • DOI: https://doi.org/10.1007/s11433-010-3205-0

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