Importance of mineralogical data for groundwater quality affectedby CO2 leakage

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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 ... continued below

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Xu, Tianfu February 13, 2006.

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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.

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  • Internation Symposium on Site Characterizationfor CO2 Geological Storage, Berkeley, CA, 20-22 March2006

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  • Report No.: LBNL--59728
  • Grant Number: DE-AC02-05CH11231
  • Grant Number: EPA:G4W009
  • Office of Scientific & Technical Information Report Number: 889323
  • Archival Resource Key: ark:/67531/metadc874343

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • February 13, 2006

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  • Sept. 21, 2016, 2:29 a.m.

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  • Oct. 3, 2017, 2 p.m.

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Xu, Tianfu. Importance of mineralogical data for groundwater quality affectedby CO2 leakage, article, February 13, 2006; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc874343/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.