The role of wellbore remediation on the evolution of groundwater quality from CO₂ and brine leakage
Long-term storage of CO₂ in underground reservoirs requires a careful assessment to evaluate risk to groundwater sources. The focus of this study is to assess time-frames required to restore water quality to pre-injection levels based on output from complex reactive transport simulations that exhibit plume retraction within a 200-year simulation period. We examined the relationship between plume volume, cumulative injected CO₂ mass, and permeability. The role of mitigation was assessed by projecting falloffs in plume volumes from their maximum peak levels with a Gaussian function to estimate plume recovery times to reach post-injection groundwater compositions. The results show a strong correlation between cumulative injected CO₂ mass and maximum plume pH volumes and a positive correlation between CO₂ flux, cumulative injected CO₂, and plume recovery times, with secondary dependence on permeability.
- Publication Date:
- OSTI Identifier:
- Accepted Manuscript
- Journal Name:
- Energy Procedia
- Additional Journal Information:
- Journal Volume: 63; Journal Issue: C; Journal ID: ISSN 1876-6102
- Research Org:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org:
- Country of Publication:
- United States
- 54 ENVIRONMENTAL SCIENCES; uncertainty quantification; CO₂; storage; risk assessment; reactive transport; groundwater; wellbore mitigation; plume recovery
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