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Permanent link (DOI): https://doi.org/10.7939/R36X1D

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Effects of CO2 on seismic wave speed in Fontainebleau sandstone Open Access

Descriptions

Other title
Subject/Keyword
Reservoir samulation
Seismic wave speed in sandstone
Pterophysics of Fontainebleau sandstone
Rock physics
Remote seismic detectability of CO2
Carbon geological sequestration
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Chowdhury, Md Mizanul Huq
Supervisor and department
Schmitt, Douglas R (Physics)
Examining committee member and department
Freeman, Mark (Physics )
Nouri, Alireza (Petroleum Engineering)
Heimpel, Moritz (Physics )
Department
Department of Physics
Specialization
Geophysics
Date accepted
2014-09-24T16:09:49Z
Graduation date
2014-11
Degree
Master of Science
Degree level
Master's
Abstract
In geological sequestration CO2 leakage is a vital concern; consequently monitoring and verifying the subsurface movement and phase behaviour of the injected CO2 is very important to ensure the integrity of the reservoir. Seismic methods are thought to be one way to monitor the changes in subsurface because the seismic velocities are sensitive to a rock's pore space content. The study of the effect of CO2 on seismic wave propagation is scientifically interesting because CO2 can exist in gas, liquid, and supercritical fluid phases over the modest temperature and pressure ranges; CO2's critical point lies near 31' C and 7.4 MPa. We have carried out a series of ultrasonic pulse transmission experiments on several samples of fully CO2 saturated Fontainebleau sandstone over pore fluid pressure ranges of 1 MPa to 20 MPa and at two constant temperatures below (21' C) and above (50' C) the critical temperature. These ranges were chosen to cross the gas-liquid and gas-supercritical transitions, respectively. We have noticed a 1.5-2% P-wave speed reduction in our gas to liquid transition while other two transitions show gradual changes. The main motivation of this work is to obtain a good understanding of the rock physics involved with CO2 as pore fluid. This work also provides an idea of remote seismic detectability of CO2 in the monitoring process.
Language
English
DOI
doi:10.7939/R36X1D
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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