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Identifying and Understanding Microbial Methanogenesis in CO2 Storage.

R L Tyne1, P H Barry1, M Lawson2

  • 1Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, United States.

Environmental Science & Technology
|June 16, 2023
PubMed
Summary
This summary is machine-generated.

Microbial methanogenesis can impact geological carbon capture and storage (CCS) by altering fluid composition and dynamics. Further research and monitoring are needed to understand these biogeochemical processes in CO2 storage sites.

Keywords:
CO2 storagebiogeochemical tracingclumped isotopesmicrobial methanogenesismicrobial sequencingnoble gasesstable isotopes

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Area of Science:

  • Geological storage of carbon dioxide (CO2)
  • Subsurface biogeochemistry
  • Microbial impacts on energy storage

Background:

  • Carbon capture and storage (CCS) is vital for net-zero strategies, relying on safe geological storage.
  • Current CCS research primarily addresses CO2 physiochemical behavior, overlooking microbial impacts.
  • Subsurface microbial processes, like methanogenesis, can significantly affect CO2 storage.

Purpose of the Study:

  • To review the impact of microbial methanogenesis on CO2 storage in geological systems.
  • To assess the scale and geological settings of methanogenesis relevant to CO2 storage.
  • To identify knowledge gaps and suggest future research directions.

Main Methods:

  • Literature review of microbial methanogenesis in geological CO2 storage.
  • Analysis of factors influencing methanogenesis kinetics and energetics (e.g., H2 availability).
  • Evaluation of methanogenesis potential across different geological storage types.

Main Results:

  • Methanogenesis is possible in all geological CO2 storage types, but often limited by hydrogen (H2) generation.
  • Hydrogen bioavailability, and thus methanogenesis potential, is highest in depleted hydrocarbon fields and lowest in saline aquifers.
  • Microbial activity can alter fluid composition and dynamics, potentially reducing storage capacity and changing CO2 mobility.

Conclusions:

  • Microbial methanogenesis poses a potential risk to the efficacy and safety of geological CO2 storage.
  • Integrated monitoring for biogeochemical processes is essential for effective CO2 storage management.
  • Further research is required to fully understand and mitigate the impacts of microbial methanogenesis on CO2 storage sites.