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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

In-situ experiment reveals CO2 enriched fluid migration in faulted caprock

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  • Media type: E-Article
  • Title: In-situ experiment reveals CO2 enriched fluid migration in faulted caprock
  • Contributor: 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
  • imprint: Springer Science and Business Media LLC, 2023
  • Published in: Scientific Reports
  • Language: English
  • DOI: 10.1038/s41598-023-43231-6
  • ISSN: 2045-2322
  • Keywords: Multidisciplinary
  • Origination:
  • Footnote:
  • Description: <jats:title>Abstract</jats:title><jats:p>The sealing characteristics of the geological formation located above a CO<jats:sub>2</jats:sub> storage reservoir, the so-called caprock, are essential to ensure efficient geological carbon storage. If CO<jats:sub>2</jats:sub> 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 CO<jats:sub>2</jats:sub>-enriched fluid was continuously injected in a faulted caprock analogue. Our results show that the CO<jats:sub>2</jats:sub> 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 CO<jats:sub>2</jats:sub>-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 CO<jats:sub>2</jats:sub> in fault zones.</jats:p>
  • Access State: Open Access