Hydrogen-induced calcite dissolution in Amaltheenton Formation claystones: Implications for underground hydrogen storage caprock integrity

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung


With the rising potential of underground hydrogen storage (UHS) in depleted oil and gas reservoirs or deep saline aquifers, questions remain regarding changes to geological units due to interaction with injected hydrogen. Of particular importance is the integrity of potential caprocks/seals with respect to UHS. The results of this study show significant dissolution of calcite fossil fragments in claystone caprock proxies that were treated with a combination of hydrogen and 10 wt% NaCl brine. This is the first time it has been experimentally observed in claystones. The purpose of this short communication is to document the initial results that indicate the potential alteration of caprocks with injected hydrogen, and to further highlight the need for hydrogen-specific studies of caprocks in areas proposed for UHS.
Seiten (von - bis)30621-30626
FachzeitschriftInternational Journal of Hydrogen Energy
PublikationsstatusVeröffentlicht - 19 Aug. 2022

Bibliographische Notiz

Funding Information:
Gerhard Hawranek prepared BIB-SEM samples and collected SEM mapping data. Peter Obermeier is thanked for collecting and providing sample material for the experiments. This study was funded by the Austrian Science Fund FWF (grant no. 33883 ) with additional financial support provided by the hydrogen research program at Montanuniversitaet Leoben.

Publisher Copyright:
© 2022 The Author(s)

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