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Title: Seismic attenuation due to wave-induced flow

Abstract

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 field data.

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
15013612
Report Number(s):
UCRL-JRNL-200391
Journal ID: ISSN 0148-0227; JGREA2; TRN: US200601%%489
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Journal Article
Journal Name:
Journal of Geophysical Research
Additional Journal Information:
Journal Volume: 109; Journal Issue: 1; Journal ID: ISSN 0148-0227
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; ATTENUATION; CLAYS; GRAIN SIZE; LITHOLOGY; MIXTURES; POROSITY; SCALE MODELS; SEDIMENTARY ROCKS; WATER; WAVELENGTHS

Citation Formats

Pride, S, Berryman, J, and Harris, J. Seismic attenuation due to wave-induced flow. United States: N. p., 2003. Web.
Pride, S, Berryman, J, & Harris, J. Seismic attenuation due to wave-induced flow. United States.
Pride, S, Berryman, J, and Harris, J. Fri . "Seismic attenuation due to wave-induced flow". United States. https://www.osti.gov/servlets/purl/15013612.
@article{osti_15013612,
title = {Seismic attenuation due to wave-induced flow},
author = {Pride, S and Berryman, J and Harris, J},
abstractNote = {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 field data.},
doi = {},
url = {https://www.osti.gov/biblio/15013612}, journal = {Journal of Geophysical Research},
issn = {0148-0227},
number = 1,
volume = 109,
place = {United States},
year = {2003},
month = {10}
}