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Title: Probabilistic evaluation of shallow groundwater resources at a hypothetical carbon sequestration site

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep04006· OSTI ID:1158456
 [1];  [1];  [2];  [1];  [1];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Carbon sequestration in geologic reservoirs is an important approach for mitigating greenhouse gases emissions to the atmosphere. This study first develops an integrated Monte Carlo method for simulating CO2 and brine leakage from carbon sequestration and subsequent geochemical interactions in shallow aquifers. Then, we estimate probability distributions of five risk proxies related to the likelihood and volume of changes in pH, total dissolved solids, and trace concentrations of lead, arsenic, and cadmium for two possible consequence thresholds. The results indicate that shallow groundwater resources may degrade locally around leakage points by reduced pH and increased total dissolved solids (TDS). The volumes of pH and TDS plumes are most sensitive to aquifer porosity, permeability, and CO2 and brine leakage rates. The estimated plume size of pH change is the largest, while that of cadmium is the smallest among the risk proxies. Plume volume distributions of arsenic and lead are similar to those of TDS. The scientific results from this study provide substantial insight for understanding risks of deep fluids leaking into shallow aquifers, determining the area of review, and designing monitoring networks at carbon sequestration sites.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1158456
Report Number(s):
PNNL-SA-100638; AA9010200
Journal Information:
Scientific Reports, Vol. 4; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 60 works
Citation information provided by
Web of Science

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Cited By (11)

Modeling the potential impacts of CO 2 sequestration on shallow groundwater: The fate of trace metals and organic compounds before and after leakage stops : Original Research Article: Modeling the potential impacts of CO journal September 2017
Sensitivity thresholds of groundwater parameters for detecting CO2 leakage at a geologic carbon sequestration site journal October 2019
Case study for investigating groundwater and the future of mountain spring discharges in Southern Italy journal September 2017
The measurement of metals by diffusive gradients in thin films (DGT) at sediment/water interface (SWI) of bay and remobilization assessment journal November 2014
Reactive transport modeling of arsenic mobilization in shallow groundwater: impacts of CO2 and brine leakage journal April 2017
Impact of naturally leaking carbon dioxide on soil properties and ecosystems in the Qinghai-Tibet plateau journal June 2017
Unstable, Super Critical CO2–Water Displacement in Fine Grained Porous Media under Geologic Carbon Sequestration Conditions journal August 2019
A quantitative analysis of hydraulic interaction processes in stream-aquifer systems journal January 2016
Improved estimation of hydraulic conductivity by combining stochastically simulated hydrofacies with geophysical data journal March 2016
Reactive Transport Modeling of the Enhancement of Density-Driven CO2 Convective Mixing in Carbonate Aquifers and its Potential Implication on Geological Carbon Sequestration journal April 2016
Divergence of stable isotopes in tap water across China journal March 2017