Articles | Volume 13, issue 12
Research article
05 Dec 2022
Research article |  | 05 Dec 2022

Insights into the interaction of a shale with CO2

Eleni Stavropoulou and Lyesse Laloui

Related subject area

Subject area: Tectonic plate interactions, magma genesis, and lithosphere deformation at all scales | Editorial team: Structural geology and tectonics, paleoseismology, rock physics, experimental deformation | Discipline: Tectonics
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Cited articles

Alemu, B. L., Aagaard, P., Munz, I. A., and Skurtveit, E.: Caprock interaction with CO2: A laboratory study of reactivity of shale with supercritical CO2 and brine, Appl. Geochem., 26, 1975–1989,, 2011. 
Amann-Hildenbrand, A., Bertier, P., Busch, A., and Krooss, B. M.: Experimental investigation of the sealing capacity of generic clay-rich caprocks, Int. J. Greenh. Gas Con., 19, 620–641,, 2013 
Armitage, P. J., Worden, R. H., Faulkner, D. R., Aplin, A. C., Butcher, A. R., and Iliffe, J.: Diagenetic and sedimentary controls on porosity in Lower Carboniferous fine-grained lithologies, Krechba field, Algeria: A petrological study of a caprock to a carbon capture site, Mar. Petrol. Geol., 27, 1395–1410,, 2010. 
Armitage, P. J., Faulkner, D. R., and Worden, R. H.: Caprock corrosion, Nat. Geosci., 6, 79–80, 2013. 
Bedford, J., Fusseis, F., Leclère, H., Wheeler, J., and Faulkner, D.: A 4D view on the evolution of metamorphic dehydration reactions, Sci. Rep., 7, 1–7,, 2017. 
Short summary
Shales are identified as suitable caprock formations for geolocigal CO2 storage thanks to their low permeability. Here, small-sized shale samples are studied under field-representative conditions with X-ray tomography. The geochemical impact of CO2 on calcite-rich zones is for the first time visualised, the role of pre-existing micro-fissures in the CO2 invasion trapping in the matererial is highlighted, and the initiation of micro-cracks when in contact with anhydrous CO2 is demonstrated.