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RECORD NUMBER: 4 OF 15

OLS Field Name OLS Field Data
Main Title Effects of pore fluids in the subsurface on ultrasonic wave propagation.
Author Seifert, P. K. ;
CORP Author USDOE Office of Energy Research, Washington, DC (United States). ;Environmental Protection Agency, Washington, DC (United States). ;Department of Defense, Washington, DC (United States).
Publisher 31 May 1998
Year Published 1998
Report Number LBNL-41781; AC03-76SF00098, AFOSR-960010;
Stock Number DE98056108
Additional Subjects Sand ; Water Saturation ; Interstitial Water ; Ultrasonic Waves ; Wave Propagation ; Mathematical Models ; Site Characterization ; Dodecane ; Viscosity ; Electric Conductivity ; EDB/580000 ; EDB/540210 ; Theses
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NTIS  DE98056108 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 05/04/2000
Collation 121p
Abstract
This thesis investigates ultrasonic wave propagation in unconsolidated sands in the presence of different pore fluids. Laboratory experiments have been conducted in the sub-MHz range using quartz sand fully saturated with one or two liquids. Elastic wave propagation in unconsolidated granular material is computed with different numerical models: in one-dimension a scattering model based on an analytical propagator solution, in two dimensions a numerical approach using the boundary integral equation method, in three dimensions the local flow model (LFM), the combined Biot and squirt flow theory (BISQ) and the dynamic composite elastic medium theory (DYCEM). The combination of theoretical and experimental analysis yields a better understanding of how wave propagation in unconsolidated sand is affected by (a) homogeneous phase distribution; (b) inhomogeneous phase distribution, (fingering, gas inclusions); (c) pore fluids of different viscosity; (d) wettabilities of a porous medium. The first study reveals that the main ultrasonic P-wave signatures, as a function of the fraction on nonaqueous-phase liquids in initially water-saturated sand samples, can be explained by a 1-D scattering model. The next study investigates effects of pore fluid viscosity on elastic wave propagation, in laboratory experiments conducted with sand samples saturated with fluids of different viscosities. The last study concentrates on the wettability of the grains and its effect on elastic wave propagation and electrical resistivity.