Seismic attenuation due to wave-induced flow

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Analytical expressions for three P-wave attenuation mechanisms in sedimentary rocks are given a unified theoretical framework. Two of the models concern wave-induced flow due to heterogeneity in the elastic moduli at mesoscopic scales (scales greater than grain sizes but smaller than wavelengths). In the first model, the heterogeneity is due to lithological variations (e.g., mixtures of sands and clays) with a single fluid saturating all the pores. In the second model, a single uniform lithology is saturated in mesoscopic ''patches'' by two immiscible fluids (e.g., air and water). In the third model, the heterogeneity is at ''microscopic'' grain scales (broken ... continued below

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17 pages

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Pride, S.R.; Berryman, J.G. & Harris, J.M. October 9, 2003.

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Analytical expressions for three P-wave attenuation mechanisms in sedimentary rocks are given a unified theoretical framework. Two of the models concern wave-induced flow due to heterogeneity in the elastic moduli at mesoscopic scales (scales greater than grain sizes but smaller than wavelengths). In the first model, the heterogeneity is due to lithological variations (e.g., mixtures of sands and clays) with a single fluid saturating all the pores. In the second model, a single uniform lithology is saturated in mesoscopic ''patches'' by two immiscible fluids (e.g., air and water). In the third model, the heterogeneity is at ''microscopic'' grain scales (broken grain contacts and/or micro-cracks in the grains) and the associated fluid response corresponds to ''squirt flow''. The model of squirt flow derived here reduces to proper limits as any of the fluid bulk modulus, crack porosity, and/or frequency is reduced to zero. It is shown that squirt flow is incapable of explaining the measured level of loss (10{sup -2} < Q{sup -1} < 10{sup -1}) within the seismic band of frequencies (1 to 10{sup 4} Hz); however, either of the two mesoscopic scale models easily produce enough attenuation to explain the field data.

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17 pages

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OSTI as DE00836673

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  • Journal Name: Journal of Geophysical Research; Journal Volume: 109; Journal Issue: B1; Other Information: Submitted to Journal of Geophysical Research: Volume 109, No.B1; Journal Publication Date: 01/14/2004

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  • Report No.: LBNL--53898
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 836673
  • Archival Resource Key: ark:/67531/metadc781022

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  • October 9, 2003

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  • Dec. 3, 2015, 9:30 a.m.

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  • April 4, 2016, 2:22 p.m.

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Pride, S.R.; Berryman, J.G. & Harris, J.M. Seismic attenuation due to wave-induced flow, article, October 9, 2003; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc781022/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.