This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1016/j.ijhydene.2022.07.023. This is version 1 of this Preprint.
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.
DOI
https://doi.org/10.31223/X5205X
Subjects
Geology, Physical Sciences and Mathematics
Keywords
Underground Hydrogen Storage, Caprock Integrity, Calcite dissolution, Hydrogen
Dates
Published: 2022-04-22 18:57
Last Updated: 2022-04-22 22:57
License
CC BY Attribution 4.0 International
Additional Metadata
Data Availability (Reason not available):
bulk of the raw data (SEM composite images) are included in the manuscript figures
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