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Title: Element mobilization and immobilization from carbonate rocks between CO 2 storage reservoirs and the overlying aquifers during a potential CO 2 leakage

Abstract

In spite of the numerous studies on changes within the reservoir following CO2 injection and the effects of CO2 release into overlying aquifers, little or no literature is available on the effect of CO2 release on rock between the storage reservoirs and subsurface. This is important, because the interactions that occur in this zone between the CO2 storage reservoir and the subsurface may have a significant impact on risk analysis for CO2 storage projects. To address this knowledge gap, relevant rock materials, temperatures and pressures were used to study mineralogical and elemental changes in this intermediate zone. Furthermore, after rocks reacted with CO2-acidified 0.01 M NaCl, liquid analysis showed an increase of major elements (e.g., Ca and Mg) and variable concentrations of potential contaminants (e.g., Sr and Ba); lower aqueous concentrations of these elements were observed in N2 control experiments, likely due to differences in pH between the CO2 and N2 experiments. In experiments with As/Cd and/or organic spikes, representing potential contaminants in the CO2 plume originating in the storage reservoir, most or all of these contaminants were removed from the aqueous phase. SEM and Mössbauer spectroscopy results showed the formation of new minerals and Fe oxides in some CO2-reactedmore » samples, indicating potential for contaminant removal through mineral incorporation or adsorption onto Fe oxides. These experiments show the interactions between the CO2-laden plume and the rock between storage reservoirs and overlying aquifers have the potential to affect the level of risk to overlying groundwater, and should be considered during site selection and risk evaluation.« less

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1416958
Report Number(s):
PNNL-SA-125304
Journal ID: ISSN 0045-6535; PII: S004565351732177X
Grant/Contract Number:  
AC05-76RL01830; AC06-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Chemosphere
Additional Journal Information:
Journal Volume: 197; Journal ID: ISSN 0045-6535
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; CO2 sequestration; carbonate; CO2 transport; storage reservoir

Citation Formats

Lawter, Amanda R., Qafoku, Nikolla P., Asmussen, R. Matthew, Kukkadapu, Ravi K., Qafoku, Odeta, Bacon, Diana H., and Brown, Christopher F. Element mobilization and immobilization from carbonate rocks between CO 2 storage reservoirs and the overlying aquifers during a potential CO 2 leakage. United States: N. p., 2018. Web. doi:10.1016/j.chemosphere.2017.12.199.
Lawter, Amanda R., Qafoku, Nikolla P., Asmussen, R. Matthew, Kukkadapu, Ravi K., Qafoku, Odeta, Bacon, Diana H., & Brown, Christopher F. Element mobilization and immobilization from carbonate rocks between CO 2 storage reservoirs and the overlying aquifers during a potential CO 2 leakage. United States. doi:10.1016/j.chemosphere.2017.12.199.
Lawter, Amanda R., Qafoku, Nikolla P., Asmussen, R. Matthew, Kukkadapu, Ravi K., Qafoku, Odeta, Bacon, Diana H., and Brown, Christopher F. Thu . "Element mobilization and immobilization from carbonate rocks between CO 2 storage reservoirs and the overlying aquifers during a potential CO 2 leakage". United States. doi:10.1016/j.chemosphere.2017.12.199. https://www.osti.gov/servlets/purl/1416958.
@article{osti_1416958,
title = {Element mobilization and immobilization from carbonate rocks between CO 2 storage reservoirs and the overlying aquifers during a potential CO 2 leakage},
author = {Lawter, Amanda R. and Qafoku, Nikolla P. and Asmussen, R. Matthew and Kukkadapu, Ravi K. and Qafoku, Odeta and Bacon, Diana H. and Brown, Christopher F.},
abstractNote = {In spite of the numerous studies on changes within the reservoir following CO2 injection and the effects of CO2 release into overlying aquifers, little or no literature is available on the effect of CO2 release on rock between the storage reservoirs and subsurface. This is important, because the interactions that occur in this zone between the CO2 storage reservoir and the subsurface may have a significant impact on risk analysis for CO2 storage projects. To address this knowledge gap, relevant rock materials, temperatures and pressures were used to study mineralogical and elemental changes in this intermediate zone. Furthermore, after rocks reacted with CO2-acidified 0.01 M NaCl, liquid analysis showed an increase of major elements (e.g., Ca and Mg) and variable concentrations of potential contaminants (e.g., Sr and Ba); lower aqueous concentrations of these elements were observed in N2 control experiments, likely due to differences in pH between the CO2 and N2 experiments. In experiments with As/Cd and/or organic spikes, representing potential contaminants in the CO2 plume originating in the storage reservoir, most or all of these contaminants were removed from the aqueous phase. SEM and Mössbauer spectroscopy results showed the formation of new minerals and Fe oxides in some CO2-reacted samples, indicating potential for contaminant removal through mineral incorporation or adsorption onto Fe oxides. These experiments show the interactions between the CO2-laden plume and the rock between storage reservoirs and overlying aquifers have the potential to affect the level of risk to overlying groundwater, and should be considered during site selection and risk evaluation.},
doi = {10.1016/j.chemosphere.2017.12.199},
journal = {Chemosphere},
number = ,
volume = 197,
place = {United States},
year = {2018},
month = {1}
}

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