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Measurements of the elastic and anelastic properties of sandstone flooded with supercritical CO 2
Author(s) -
Mikhaltsevitch Vassily,
Lebedev Maxim,
Gurevich Boris
Publication year - 2014
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/1365-2478.12181
Subject(s) - supercritical fluid , geology , ultrasonic sensor , attenuation , bed , extensional definition , mineralogy , geotechnical engineering , materials science , anisotropy , seismology , thermodynamics , optics , acoustics , tectonics , physics
The aim of this study was to investigate the effects of supercritical CO 2 (scCO 2 ) injection on the elastic and anelastic properties of sandstone at seismic and ultrasonic frequencies. We present the results of the low‐frequency and ultrasonic experiments conducted on water‐saturated sandstone (Donnybrook, Western Australia) flooded with scCO 2 . The sandstone was cut in the direction perpendicular to a formation bedding plane and tested in a Hoek triaxial pressure cell. During the experiments with scCO 2, the low‐frequency and ultrasonic systems and the pump dispensing scCO 2 were held at a temperature of 42°C. The elastic parameters obtained for the sandstone with scCO 2 at seismic (0.1 Hz–100 Hz) and ultrasonic (∼0.5 MHz) frequencies are very close to those for the dry rock. The extensional attenuation was also measured at seismic frequencies for the dry, water‐saturated, and scCO 2 ‐injected sandstones. The applicability of Gassmann's fluid substitution theory to obtained results was also tested during the experiments.