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Research ArticleARTICLES

Two-dimensional reactive transport modeling of CO2 injection in a saline aquifer at the Sleipner site, North Sea

Pascal Audigane, Irina Gaus, Isabelle Czernichowski-Lauriol, Karsten Pruess and Tianfu Xu
American Journal of Science September 2007, 307 (7) 974-1008; DOI: https://doi.org/10.2475/07.2007.02
Pascal Audigane
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Irina Gaus
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Isabelle Czernichowski-Lauriol
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Karsten Pruess
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Tianfu Xu
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Abstract

This paper presents a 2D reactive transport model of long-term geological storage of carbon dioxide. A data set from the Utsira formation in Sleipner (North Sea) is utilized for geochemical simulation, while the aquifer is approximated as a 2D cylindrically symmetric system. Using the reactive transport code TOUGHREACT, a 25 year injection scenario followed by a 10,000 year storage period are simulated. Supercritical CO2 migration, dissolution of the CO2 in the brine, and geochemical reactions with the host rock are considered in the model. Two mineralogical assemblages are considered in the Utsira formation, a sand formation that is highly permeable and a shale formation representing four semi-permeable layers in the system that reduce the upward migration of the supercritical CO2. The impacts of mineral dissolution and precipitation on porosity are calculated. Furthermore, the 2D cylindrical geometry of the mesh allows simulating both the upward migration of the supercritical gas bubble as well as the downward migration of the brine containing dissolved CO2. A mass balance of the CO2 stored in, respectively, the supercritical phase, dissolved in the aqueous phase, and sequestered in solid mineral phases (carbonate precipitation) is calculated over time. Simulations with lower residual gas saturation and with different mesh refinement are also performed to test the sensitivity on mass balance estimates.

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American Journal of Science
Vol. 307, Issue 7
1 Sep 2007
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Two-dimensional reactive transport modeling of CO2 injection in a saline aquifer at the Sleipner site, North Sea
Pascal Audigane, Irina Gaus, Isabelle Czernichowski-Lauriol, Karsten Pruess, Tianfu Xu
American Journal of Science Sep 2007, 307 (7) 974-1008; DOI: 10.2475/07.2007.02

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Two-dimensional reactive transport modeling of CO2 injection in a saline aquifer at the Sleipner site, North Sea
Pascal Audigane, Irina Gaus, Isabelle Czernichowski-Lauriol, Karsten Pruess, Tianfu Xu
American Journal of Science Sep 2007, 307 (7) 974-1008; DOI: 10.2475/07.2007.02
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  • Article
    • Abstract
    • INTRODUCTION
    • NUMERICAL MODELING STATE OF THE ART
    • NUMERICAL METHOD
    • THE SLEIPNER SITE
    • SIMULATION RESULTS
    • SUMMARY AND CONCLUSION
    • Acknowledgments
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