Dependence of seismic wave attenuations and velocities in rock on pore fluid properties

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doi: 10.1016/S0079-1946(97)00080-3
Authors:Wulff, A. M.; Burkhardt, H.
Author Affiliations:Primary:
Technische Universität Berlin, Institut für Angewandte Geophysik, Berlin, Federal Republic of Germany
Volume Title:Solid Earth
Volume Authors:Richter, A. K.
Source:Solid Earth, A. K. Richter. Physics and Chemistry of the Earth, 22(1-2), p.69-73. Publisher: Pergamon, Oxford-New York-Toronto, International. ISSN: 0079-1946
Publication Date:1997
Note:In English. 14 refs.Special issue; illus., incl. 1 table
Summary:Experimental and theoretical results have shown that the influence of pore fluid properties on rock elastic and inelastic properties is explained mainly by two major physical mechanisms: 1) a seismic wave may induce viscous local fluid flow within the pore space, leading to frequence-dependent attenuation and velocity dispersion, and 2) polar fluids cause a modulus reaction which may be effective already at small degrees of saturation. Full saturation of the rock pore space prevents local fluid flow but causes a frequency-independent stiffening of the rock bulk modulus. This additional effect at higher saturations only influences the velocity of the P-wave. Both mechanisms, as well as the additional stiffening effect, have to be considered in relating seismic wave properties to the saturant and the degree of saturation. The pore fluid effects on the seismic properties of rocks are discussed here using experimental results for ultrasonic waves in Obernkirchener sandstone saturated with different fluids. Related calculations of the fluid influences on velocity and attenuation demonstrate the effectiveness of the fluid mechanisms in this rock. [R.E.S.]
Subjects:Attenuation; Body waves; Elastic waves; Fluid phase; P-waves; Pore water; Seismic waves; Seismology; Velocity
Abstract Numbers:98M/2158
Record ID:1998020910
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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