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Geological Society, London, Special Publications; 2009; v. 319; p. 171-183;
DOI: 10.1144/SP319.14
© 2009 Geological Society of London

Articles

Can CO2 hydrate assist in the underground storage of carbon dioxide?

C. A. Rochelle1,*, A. P. Camps1,2, D. Long3, A. Milodowski1, K. Bateman1, D. Gunn1, P. Jackson1, M. A. Lovell2 & J. Rees1

1 British Geological Survey, Keyworth, Nottingham NG12 5GG, UK
2 Department of Geology, University of Leicester, Leicester LE1 7RH, UK
3 British Geological Survey, Edinburgh EH9 3LA, UK

* Corresponding author (e-mail: caro{at}bgs.ac.uk)

The sequestration of CO2 in the deep geosphere is one potential method for reducing anthropogenic emissions to the atmosphere without necessarily incurring a significant change in our energy-producing technologies. Containment of CO2 as a liquid and an associated hydrate phase, under cool conditions, offers an alternative underground storage approach compared with conventional supercritical CO2 storage at higher temperatures. We briefly describe conventional approaches to underground storage, review possible approaches for using CO2 hydrate in CO2 storage generally, and comment on the important role CO2 hydrate could play in underground storage. Cool underground storage appears to offer certain advantages in terms of physical, chemical and mineralogical processes, which may usefully enhance trapping of the stored CO2. This approach also appears to be potentially applicable to large areas of sub-seabed sediments offshore Western Europe.