Slow Waves in Fractures Filled with Viscous Fluid

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Stoneley guided waves in a fluid-filled fracture generally have larger amplitudes than other waves, and therefore, their properties need to be incorporated in more realistic models. In this study, a fracture is modeled as an infinite layer of viscous fluid bounded by two elastic half-spaces with identical parameters. For small fracture thickness, I obtain a simple dispersion equation for wave-propagation velocity. This velocity is much smaller than the velocity of a fluid wave in a Biot-type solution, in which fracture walls are assumed to be rigid. At seismic prospecting frequencies and realistic fracture thicknesses, the Stoneley guided wave has wavelengths ... continued below

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Korneev, Valeri January 8, 2008.

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Stoneley guided waves in a fluid-filled fracture generally have larger amplitudes than other waves, and therefore, their properties need to be incorporated in more realistic models. In this study, a fracture is modeled as an infinite layer of viscous fluid bounded by two elastic half-spaces with identical parameters. For small fracture thickness, I obtain a simple dispersion equation for wave-propagation velocity. This velocity is much smaller than the velocity of a fluid wave in a Biot-type solution, in which fracture walls are assumed to be rigid. At seismic prospecting frequencies and realistic fracture thicknesses, the Stoneley guided wave has wavelengths on the order of several meters and an attenuation Q factor exceeding 10, which indicates the possibility of resonance excitation in fluid-bearing rocks. The velocity and attenuation of Stoneley guided waves are distinctly different at low frequencies for water and oil. The predominant role of fractures in fluid flow at field scales is supported by permeability data showing an increase of several orders of magnitude when compared to values obtained at laboratory scales. These data suggest that Stoneley guided waves should be taken into account in theories describing seismic wave propagation in fluid-saturated rocks.

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  • Journal Name: Geophysics; Journal Volume: 73; Journal Issue: 1; Related Information: Journal Publication Date: Jan./Feb.2008

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  • Report No.: LBNL--63821
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1190/1.2802174 | External Link
  • Office of Scientific & Technical Information Report Number: 929065
  • Archival Resource Key: ark:/67531/metadc899681

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 8, 2008

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 7, 2016, 9:26 p.m.

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Korneev, Valeri. Slow Waves in Fractures Filled with Viscous Fluid, article, January 8, 2008; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc899681/: accessed July 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.