Extensional wave attenuation and velocity in partially saturated sand in the sonic frequency range

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Extensional wave attenuation and velocity measurements on a high permeability Monterey sand were performed over a range of gas saturations for imbibition and degassing conditions. These measurements were conducted using extensional wave pulse propagation and resonance over a 1-9 kHz frequency range for a hydrostatic confining pressure of 8.3 MPa. Analysis of the extensional wave data and the corresponding X-ray CT images of the gas saturation show strong attenuation resulting from the presence of the gas (Q{sub E} dropped from 300 for the dry sand to 30 for the partially-saturated sand), with larger attenuation at a given saturation resulting from ... continued below

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Liu, Z.; Rector, J.W.; Nihei, K.T.; Tomutsa, L.; Myer, L.R. & Nakagawa, S. August 10, 2001.

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Extensional wave attenuation and velocity measurements on a high permeability Monterey sand were performed over a range of gas saturations for imbibition and degassing conditions. These measurements were conducted using extensional wave pulse propagation and resonance over a 1-9 kHz frequency range for a hydrostatic confining pressure of 8.3 MPa. Analysis of the extensional wave data and the corresponding X-ray CT images of the gas saturation show strong attenuation resulting from the presence of the gas (Q{sub E} dropped from 300 for the dry sand to 30 for the partially-saturated sand), with larger attenuation at a given saturation resulting from heterogeneous gas distributions. The extensional wave velocities are in agreement with Gassmann theory for the test with near-homogeneous gas saturation and with a patchy saturation model for the test with heterogeneous gas saturation. These results show that partially-saturated sands under moderate confining pressure can produce strong intrinsic attenuation for extensional waves.

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OSTI as DE00797849

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  • SEG International Exposition and Seventy First Annual Meeting, San Antonio, TX (US), 09/09/2001--09/14/2001

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  • Report No.: LBNL--50301
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 797849
  • Archival Resource Key: ark:/67531/metadc742102

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  • August 10, 2001

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  • Oct. 19, 2015, 7:39 p.m.

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  • April 4, 2016, 12:56 p.m.

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Liu, Z.; Rector, J.W.; Nihei, K.T.; Tomutsa, L.; Myer, L.R. & Nakagawa, S. Extensional wave attenuation and velocity in partially saturated sand in the sonic frequency range, article, August 10, 2001; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc742102/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.