Geochemical monitoring of fluid-rock interaction and CO 2 storage at the Weyburn CO 2-injection enhanced oil recovery site, Saskatchewan, Canada
The Weyburn Oil Field, Saskatchewan is the site of a large (5000 tonnes/day of CO 2) CO 2-EOR injection project By EnCana Corporation. Pre- and post-injection samples (Baseline and Monitor-1, respectively) of produced fluids from approximately 45 vertical wells were taken and chemically analyzed to...
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Published in | Energy (Oxford) Vol. 29; no. 9; pp. 1393 - 1401 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
2004
|
Online Access | Get full text |
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Summary: | The Weyburn Oil Field, Saskatchewan is the site of a large (5000 tonnes/day of CO
2) CO
2-EOR injection project By EnCana Corporation. Pre- and post-injection samples (Baseline and Monitor-1, respectively) of produced fluids from approximately 45 vertical wells were taken and chemically analyzed to determine changes in the fluid chemistry and isotope composition between August 2000 and March 2001. After 6 months of CO
2 injection, geochemical parameters including pH, [HCO
3], [Ca], [Mg], and δ
13CO
2(g) point to areas in which injected CO
2 dissolution and reservoir carbonate mineral dissolution have occurred. Pre-injection fluid compositions suggest that the reservoir brine in the injection area may be capable of storing as much as 100 million tonnes of dissolved CO
2. Modeling of water-rock reactions show that clay minerals and feldspar, although volumetrically insignificant, may be capable of acting as pH buffers, allowing injected CO
2 to be stored as bicarbonate in the formation water or as newly precipitated carbonate minerals, given favorable reaction kinetics. |
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ISSN: | 0360-5442 |
DOI: | 10.1016/j.energy.2004.03.073 |