Dissolved trace elements dynamics during a rich-CO2-water leakage in a near-surface carbonate freshwater aquifer

Rossi, Léna; Loisy, Corinne; Cérepi, Adrian; Petit, Anélia; Roux, Olivier Le; Estublier, Audrey; Noirez, Sonia; Martin, F.D.; Hautefeuille, Benoit; Brichart, Thomas; García, Bruno

doi:10.1016/j.ijggc.2021.103561

Cited by 5 publications

(1 citation statement)

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“…In-situ injection experiments in natural settings have commonly been conducted on permeable deep storage reservoirs (e.g. 40 ) or shallow aquifer systems 38 , 41 , 42 . In-situ studies in formations with permeabilities comparable to a caprock under reservoir conditions are sparse due to practical and experimental challenges 43 .…”

Section: Introductionmentioning

confidence: 99%

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

Weber,

Rinaldi,

Roques

et al. 2023

Sci Rep

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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.

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