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Assessment of shallow aquifer remediation capacity under different groundwater management conditions in CGS field

Journal Article · · Arabian Journal of Geosciences
 [1];  [2];  [3]
  1. Jilin Univ., Changchun (China). Inst. of Water Resources and Environment and Key Lab. of Groundwater Resources and Environment; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth Science Division
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth Science Division
  3. Jilin Univ., Changchun (China). Inst. of Water Resources and Environment and Key Lab. of Groundwater Resources and Environment
Because of unknown faults and fractures in the overlying rock, CO2 stored deep underground may move upward, and the intrusion may impact shallow groundwater quality. After leakage of CO2 has ceased, the affected aquifer may show remediation capacity under natural conditions and injections and extractions. Here, the reactive transport modeling software TOUGHREACT was used to simulate the remediation capacity of a study aquifer. The simulation results show that the intrusion of leaked CO2 would decrease the pH of the target aquifer and trigger the dissolution of calcite minerals. After CO2 leakage has ceased, the pH would increase as would the concentration of Ca because of the dissolution of calcite along the flow path. Scenario simulation results of amelioration of groundwater quality by water injection and extraction show that single injection is the best option and a combination approach of injection and extraction could control the range of the affected area. The pH value should not be regarded as the single indicator for remediation capacity assessment. Parameter sensitive analysis results show that the rates of injection and extraction affect the repair results significantly.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE); Electric Power Research Inst. (EPRI), Palo Alto, CA (United States); US Environmental Protection Agency (EPA) Office of Water; Jilin Province Science and Technology Development Plan (China)
DOE Contract Number:
AC02-05CH11231
OSTI ID:
1474936
Journal Information:
Arabian Journal of Geosciences, Journal Name: Arabian Journal of Geosciences Journal Issue: 6 Vol. 9; ISSN 1866-7511
Publisher:
Springer Nature
Country of Publication:
United States
Language:
English

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