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Variation in dynamic elastic shear modulus of sandstone upon fluid saturation and substitution

Khazanehdari, J.; Sothcott, J.. 2003 Variation in dynamic elastic shear modulus of sandstone upon fluid saturation and substitution. Geophysics, 68 (2). 472-481. 10.1190/1.1567215

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Abstract/Summary

Experimental acoustic measurements on sandstone rocks at both sonic and ultrasonic frequencies show that fluid saturation can cause a noticeable change in both the dynamic bulk and shear elastic moduli of sandstones. We observed that the change in dynamic shear modulus upon fluid saturation is highly dependent on the type of saturant, its viscosity, rock microstructure, and applied pressures. Frequency dispersion has some influence on dynamic elastic moduli too, but its effect is limited to the ultrasonic frequency ranges and above. We propose that viscous coupling, reduction in free surface energy, and, to a limited extent, frequency dispersion due to both local and global flow are the main mechanisms responsible for the change in dynamic shear elastic modulus upon fluid saturation and substitution, and we quantify influences. ©2003 Society of Exploration Geophysicists

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1190/1.1567215
ISSN: 0016-8033
Additional Information. Not used in RCUK Gateway to Research.: Actually deposited by Jane Conquer using existing entry as template.
Additional Keywords: rocks, seismic waves, acoustic wave velocity, porosity, elasticity, fracture, stress effects
Date made live: 18 Aug 2008 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/158842

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