Importance of mineralogical data for groundwater quality affectedby CO2 leakage
Conference
·
OSTI ID:889323
Recently, geological storage of CO{sub 2} has been extensively investigated. The impact of leakage from CO{sub 2} storage reservoirs on groundwater quality is one of the concerns. Dissolution of CO{sub 2} in groundwater results in a decrease in pH. Such acidic condition can affect the dissolution and sorption mechanisms of many minerals (Jaffe and Wang, 2004). Some heavy-metal-bearing minerals dissolve under acidic conditions. For example, galena (PbS) can dissolve and increase significantly Pb concentrations and diminish groundwater quality. If calcite is present in the rock, it can buffer the pH and decrease galena dissolution. Therefore, mineralogical composition and distribution in caprock, overlying aquifers, and along the leakage paths are important data that should be obtained from site characterization. Insight into which minerals and compounds are most important for groundwater quality can be obtained from reactive geochemical transport simulations. Here we present results of simulations using the code TOUGHREACT, whose physical and chemical process capabilities have been discussed by Xu et al. (2006). The simulator can be applied to one-, two-, or three-dimensional porous and fractured media with physical and chemical heterogeneity, and can accommodate any number of chemical species present in liquid, gas and solid phases.
- Research Organization:
- Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
- Sponsoring Organization:
- USDOE Director, Office of Science; Environmental ProtectionAgency
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 889323
- Report Number(s):
- LBNL--59728; BnR: 400408000
- Country of Publication:
- United States
- Language:
- English
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