Impacts of elevated dissolved CO2 on a shallow groundwater system: Reactive transport modeling of a controlled-release field test
Abstract
We report one of the risks that CO2 geological sequestration imposes on the environment is the impact of potential CO2 /brine leakage on shallow groundwater. The reliability of reactive transport models predicting the response of groundwater to CO2 leakage depends on a thorough understanding of the relevant chemical processes and key parameters affecting dissolved CO2 transport and reaction. Such understanding can be provided by targeted field tests integrated with reactive transport modeling. A controlled-release field experiment was conducted in Mississippi to study the CO2-induced geochemical changes in a shallow sandy aquifer at about 50 m depth. The field test involved a dipole system in which the groundwater was pumped from one well, saturated with CO2 at the pressure corresponding to the hydraulic pressure of the aquifer, and then re-injected into the same aquifer using a second well. Groundwater samples were collected for chemical analyses from four monitoring wells before, during and after the dissolved CO2 was injected. In this paper, we present reactive transport models used to interpret the observed changes in metal concentrations in these groundwater samples. A reasonable agreement between simulated and measured concentrations indicates that the chemical response in the aquifer can be interpreted using a conceptualmore »
- Authors:
-
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- British Geological Survey, Keyworth, Nottingham (United Kingdom)
- Southern Company Services, Birmingham, AL (United States)
- Electric Power Research Institute, Palo Alto, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Fossil Energy (FE)
- OSTI Identifier:
- 1474989
- Alternate Identifier(s):
- OSTI ID: 1411089
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Chemical Geology
- Additional Journal Information:
- Journal Volume: 447; Journal Issue: C; Journal ID: ISSN 0009-2541
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES
Citation Formats
Zheng, Liange, Spycher, Nicolas, Bianchi, Marco, Pugh, John D., Varadharajan, Charuleka, Tinnacher, Ruth M., Birkholzer, Jens T., Nico, Peter, and Trautz, Robert C. Impacts of elevated dissolved CO2 on a shallow groundwater system: Reactive transport modeling of a controlled-release field test. United States: N. p., 2016.
Web. doi:10.1016/j.chemgeo.2016.10.027.
Zheng, Liange, Spycher, Nicolas, Bianchi, Marco, Pugh, John D., Varadharajan, Charuleka, Tinnacher, Ruth M., Birkholzer, Jens T., Nico, Peter, & Trautz, Robert C. Impacts of elevated dissolved CO2 on a shallow groundwater system: Reactive transport modeling of a controlled-release field test. United States. https://doi.org/10.1016/j.chemgeo.2016.10.027
Zheng, Liange, Spycher, Nicolas, Bianchi, Marco, Pugh, John D., Varadharajan, Charuleka, Tinnacher, Ruth M., Birkholzer, Jens T., Nico, Peter, and Trautz, Robert C. Sat .
"Impacts of elevated dissolved CO2 on a shallow groundwater system: Reactive transport modeling of a controlled-release field test". United States. https://doi.org/10.1016/j.chemgeo.2016.10.027. https://www.osti.gov/servlets/purl/1474989.
@article{osti_1474989,
title = {Impacts of elevated dissolved CO2 on a shallow groundwater system: Reactive transport modeling of a controlled-release field test},
author = {Zheng, Liange and Spycher, Nicolas and Bianchi, Marco and Pugh, John D. and Varadharajan, Charuleka and Tinnacher, Ruth M. and Birkholzer, Jens T. and Nico, Peter and Trautz, Robert C.},
abstractNote = {We report one of the risks that CO2 geological sequestration imposes on the environment is the impact of potential CO2 /brine leakage on shallow groundwater. The reliability of reactive transport models predicting the response of groundwater to CO2 leakage depends on a thorough understanding of the relevant chemical processes and key parameters affecting dissolved CO2 transport and reaction. Such understanding can be provided by targeted field tests integrated with reactive transport modeling. A controlled-release field experiment was conducted in Mississippi to study the CO2-induced geochemical changes in a shallow sandy aquifer at about 50 m depth. The field test involved a dipole system in which the groundwater was pumped from one well, saturated with CO2 at the pressure corresponding to the hydraulic pressure of the aquifer, and then re-injected into the same aquifer using a second well. Groundwater samples were collected for chemical analyses from four monitoring wells before, during and after the dissolved CO2 was injected. In this paper, we present reactive transport models used to interpret the observed changes in metal concentrations in these groundwater samples. A reasonable agreement between simulated and measured concentrations indicates that the chemical response in the aquifer can be interpreted using a conceptual model that encompasses two main features: (a) a fast-reacting but limited pool of reactive minerals that responds quickly to changes in pH and causes a pulse-like concentration change, and (b) a slow-reacting but essentially unlimited mineral pool that yields rising metal concentrations upon decreased groundwater velocities after pumping and injection stopped. During the injection, calcite dissolution and Ca-driven cation exchange reactions contribute to a sharp pulse in concentrations of Ca, Ba, Mg, Mn, K, Li, Na and Sr, whereas desorption reactions control a similar increase in Fe concentrations. Finally, after the injection and pumping stops and the groundwater flow rate decreases, the dissolution of relatively slow reacting minerals such as plagioclase drives the rising concentrations of alkali and alkaline earth metals observed at later stages of the test, whereas the dissolution of amorphous iron sulfide causes slowly increasing Fe concentrations.},
doi = {10.1016/j.chemgeo.2016.10.027},
journal = {Chemical Geology},
number = C,
volume = 447,
place = {United States},
year = {Sat Oct 22 00:00:00 EDT 2016},
month = {Sat Oct 22 00:00:00 EDT 2016}
}
Web of Science
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