Journal Article

FZJ-2016-06901

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Observational evidence confirms modelling of the long-term integrity of CO2-reservoir caprocks

Kampman, N. ; Busch, A. ; Bertier, P. ; Snippe, J. ; Hangx, S. ; Pipich, V.FZJ* ; Di, Z. ; Rother, G. ; Harrington, J. F. ; Evans, J. P. ; Maskell, A. ; Chapman, H. J. ; Bickle, M. J. (Corresponding author)

2016
Nature Publishing Group London

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Please use a persistent id in citations: http://hdl.handle.net/2128/13475  doi:10.1038/ncomms12268

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 ∼105 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.

Keyword(s): Earth, Environment and Cultural Heritage (1st) ; Geosciences (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS (München) ; Jülich Centre for Neutron Science JCNS (München) ; JCNS-FRM-II)
2. Neutronenstreuung (Neutronenstreuung ; JCNS-1)
3. Neutronenstreuung (ICS-1)

Research Program(s):

1. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)
2. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Experiment(s):

1. KWS-1: Small angle scattering diffractometer (NL3b)
2. KWS-3: Very small angle scattering diffractometer with focusing mirror (NL3auS)

Appears in the scientific report 2016

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