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- Title
In-situ experiment reveals CO<sub>2</sub> enriched fluid migration in faulted caprock.
- Authors
Weber, Ulrich Wolfgang; Rinaldi, Antonio Pio; Roques, Clément; Wenning, Quinn C.; Bernasconi, Stefano M.; Brennwald, Matthias S.; Jaggi, Madalina; Nussbaum, Christophe; Schefer, Senecio; Mazzotti, Marco; Wiemer, Stefan; Giardini, Domenico; Zappone, Alba; Kipfer, Rolf
- Abstract
The sealing characteristics of the geological formation located above a CO2 storage reservoir, the so-called caprock, are essential to ensure efficient geological carbon storage. If CO2 were to leak through the caprock, temporal changes in fluid geochemistry can reveal fundamental information on migration mechanisms and induced fluid–rock interactions. Here, we present the results from a unique in-situ injection experiment, where CO2-enriched fluid was continuously injected in a faulted caprock analogue. Our results show that the CO2 migration follows complex pathways within the fault structure. The joint analysis of noble gases, ion concentrations and carbon isotopes allow us to quantify mixing between injected CO2-enriched fluid and resident formation water and to describe the temporal evolution of water–rock interaction processes. The results presented here are a crucial complement to the geophysical monitoring at the fracture scale highlighting a unique migration of CO2 in fault zones.
- Subjects
CAP rock; GEOLOGICAL carbon sequestration; WATER-rock interaction; FAULT zones; GEOLOGICAL formations; CARBON isotopes; NOBLE gases
- Publication
Scientific Reports, 2023, Vol 13, Issue 1, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/s41598-023-43231-6