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Bernard Giroux edited abstract.tex
over 9 years ago
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We have performed a series of laboratory rock physics testing under various pressure and temperature conditions to
test assess the seismic response to different CO$_2$ phases on two tight sandstone samples of the sedimentary basin of the St. Lawrence Lowlands in Qu\'ebec, Canada. Results show that the seimic velocity and amplitude can be used to detect the CO$_2$ phase transition. These laboratory measurements have been used to calibrate a numerical geological model used to generate synthetic seimograms reproducing the vertical seismic profiling response to CO$_2$ injection in the reservoir formations. Results show that substitution of brine by 100\% CO$_2$ is responsible for a time-delay in the seismic traces despite very low permeabilities and porosities.
Keywords: CO$_2$, ultrasonic measurements, seismic modeling, VSP, low porosity sandstones, Gassmann's model.