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Published on: October 5, 2019
Microbial-geochemical Interactions in Underground Reservoirs: Implications for Hydrogen Storage
Laura Fablet1, Arnaud Belcour2,3, Sylvain Stephant4
1BRGM, 3 Avenue Claude Guillemin, Orléans Cedex 2, 45060, France. fablet.laura@gmail.com.
Microbial Ecology
|June 5, 2026
Summary
Deep geological environments host diverse microbes influencing underground hydrogen storage. Salinity, carbon, and human activity shape microbial communities, with some potentially consuming stored hydrogen.
Area of Science:
- Geomicrobiology
- Environmental Science
- Subsurface Microbiology
Background:
- Understanding deep subsurface microbial ecosystems is critical for natural biogeochemical processes.
- Assessing microbial roles is essential for subsurface activities like underground hydrogen storage.
Purpose of the Study:
- To compare microbial communities and geochemistry in porous reservoirs versus salt caverns.
- To investigate factors influencing microbial structure and metabolic potential in deep geological settings.
Main Methods:
- Analysis of water chemistry.
- Characterization of microbial community composition.
- Assessment of microbial metabolic potential in contrasting geological environments.
Main Results:
- Porous reservoirs (esp. carbonate facies) have carbonate-rich fluids and anaerobic microbes (methanogens, fermenters, acetogens).
- Salt caverns contain salt-saturated brines and halophilic, chemoorganotrophic microbes adapted to high salinity.
- Anthropogenic activities and hydrogeological connections can alter reservoir geochemistry and microbial profiles.
Conclusions:
- Salinity, carbon availability, temperature, and human impact significantly influence microbial communities and their functions.
- Hydrogenotrophic microorganisms in reservoirs may consume injected hydrogen, impacting gas quality.
- Activity-based assessments of microbial hydrogen consumption are needed for effective mitigation strategies in underground hydrogen storage.
Keywords:
Anaerobic microbiologyHydrogen underground storageHydrogenotrophic microorganismsSubsurfaceMore Related Videos
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