Abstract：
:Storage of anthropogenic CO2 in geological formations relies on a caprock as the primary seal preventing buoyant super-critical CO2 escaping. Although natural CO2 reservoirs demonstrate that CO2 may be stored safely for millions of years, uncertainty remains in predicting how caprocks will react with CO2-bearing brines. This uncertainty poses a significant challenge to the risk assessment of geological carbon storage. Here we describe mineral reaction fronts in a CO2 reservoir-caprock system exposed to CO2 over a timescale comparable with that needed for geological carbon storage. The propagation of the reaction front is retarded by redox-sensitive mineral dissolution reactions and carbonate precipitation, which reduces its penetration into the caprock to ∼7 cm in ∼10(5) years. This distance is an order-of-magnitude smaller than previous predictions. The results attest to the significance of transport-limited reactions to the long-term integrity of sealing behaviour in caprocks exposed to CO2.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Kampman N,Busch A,Bertier P,Snippe J,Hangx S,Pipich V,Di Z,Rother G,Harrington JF,Evans JP,Maskell A,Chapman HJ,Bickle MJdoi
10.1038/ncomms12268subject
Has Abstractpub_date
2016-07-28 00:00:00pages
12268issn
2041-1723pii
ncomms12268journal_volume
7pub_type
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