Articles | Volume 13, issue 12
https://doi.org/10.5194/se-13-1823-2022
https://doi.org/10.5194/se-13-1823-2022
Research article
 | 
05 Dec 2022
Research article |  | 05 Dec 2022

Insights into the interaction of a shale with CO2

Eleni Stavropoulou and Lyesse Laloui

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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, https://doi.org/10.1016/j.apgeochem.2011.06.028, 2011. 
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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, https://doi.org/10.1016/j.marpetgeo.2010.03.018, 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, https://doi.org/10.1038/s41598-017-07160-5, 2017. 
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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.