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

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Abstract

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.
Original languageEnglish
Pages (from-to)30621-30626
Number of pages6
JournalInternational Journal of Hydrogen Energy
Volume47.2022
Issue number71
DOIs
Publication statusPublished - 19 Aug 2022

Bibliographical note

Publisher Copyright: © 2022 The Author(s)

Keywords

  • Calcite dissolution
  • Caprock integrity
  • Hydrogen
  • Underground hydrogen storage

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