Variation in dynamic elastic shear modulus of sandstone upon fluid saturation and substitution
Variation in dynamic elastic shear modulus of sandstone upon fluid saturation and substitution
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
rocks, seismic waves, acoustic wave velocity, porosity, elasticity, fracture, stress effects
472-481
Khazanehdari, J.
6421e1e0-9f57-4947-a876-f58be799bb07
Sothcott, J.
71ab4088-7b13-46d6-9e28-67538a02d595
March 2003
Khazanehdari, J.
6421e1e0-9f57-4947-a876-f58be799bb07
Sothcott, J.
71ab4088-7b13-46d6-9e28-67538a02d595
Khazanehdari, J. and Sothcott, J.
(2003)
Variation in dynamic elastic shear modulus of sandstone upon fluid saturation and substitution.
Geophysics, 68 (2), .
(doi:10.1190/1.1567215).
Abstract
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
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Published date: March 2003
Additional Information:
Actually deposited by Jane Conquer using existing entry as template.
Keywords:
rocks, seismic waves, acoustic wave velocity, porosity, elasticity, fracture, stress effects
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Local EPrints ID: 58842
URI: http://eprints.soton.ac.uk/id/eprint/58842
ISSN: 0016-8033
PURE UUID: 954c4bd4-9984-40d2-a835-5060159d078a
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Date deposited: 18 Aug 2008
Last modified: 15 Mar 2024 11:12
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Author:
J. Khazanehdari
Author:
J. Sothcott
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