Experimental Study of Porosity Changes in Shale Caprocks Exposed to Carbon Dioxide-Saturated Brine II: Insights from Aqueous Geochemistry
Abstract
Laboratory experiments evaluated two shale caprock formations, the Gothic Shale and Marine Tuscaloosa Formation, at conditions relevant to carbon dioxide (CO2) sequestration. Both rocks were exposed to CO2-saturated brines at 160°C and 15 MPa for ~45 days. Baseline experiments for both rocks were pressurized with argon to 15 MPa for ~35 days. Varying concentrations of iron, aqueous silica, sulfate, and initial pH decreases coincide with enhanced carbonate and silicate dissolution due to reaction between CO2-saturated brine and shale. Saturation indices were calculated and activity diagrams were constructed to gain insights into sulfate, silicate, and carbonate mineral stabilities. We found that upon exposure to CO2-saturated brines, the Marine Tuscaloosa Formation appeared to be more reactive than the Gothic Shale. Evolution of aqueous geochemistry in the experiments is consistent with mineral precipitation and dissolution reactions that affect porosity. Finally, this study highlights the importance of tracking fluid chemistry to clarify downhole physicochemical responses to CO2 injection and subsequent changes in sealing capacity in CO2 storage and utilization projects.
- Authors:
-
- Univ. of Wyoming, Laramie, WY (United States). Dept. of Geology and Geophysics
- Univ. of Wyoming, Laramie, WY (United States). Dept. of Geology and Geophysics; Univ. of Wyoming, Laramie, WY (United States). School of Energy Resources
- Colorado School of Mines, Golden, CO (United States). Dept. of Geology and Geological Engineering and Hydrologic Sciences and Engineering Program
- Univ. of Wyoming, Laramie, WY (United States). Dept. of Chemical Engineering
- Colorado School of Mines, Golden, CO (United States). Civil and Environmental Engineering
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Dept. of Geomechanics
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Nanoscale Control of Geologic CO2 (NCGC)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1328308
- Grant/Contract Number:
- AC05-00OR22725; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Environmental Engineering Science
- Additional Journal Information:
- Journal Name: Environmental Engineering Science; Journal ID: ISSN 1092-8758
- Publisher:
- Mary Ann Liebert, Inc.
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; geologic carbon storage; caprock; porosity
Citation Formats
Miller, Quin R. S., Wang, Xiuyu, Kaszuba, John P., Mouzakis, Katherine M., Navarre-Sitchler, Alexis K., Alvarado, Vladimir, McCray, John E., Rother, Gernot, Bañuelos, José Leobardo, and Heath, Jason E. Experimental Study of Porosity Changes in Shale Caprocks Exposed to Carbon Dioxide-Saturated Brine II: Insights from Aqueous Geochemistry. United States: N. p., 2016.
Web. doi:10.1089/ees.2015.0592.
Miller, Quin R. S., Wang, Xiuyu, Kaszuba, John P., Mouzakis, Katherine M., Navarre-Sitchler, Alexis K., Alvarado, Vladimir, McCray, John E., Rother, Gernot, Bañuelos, José Leobardo, & Heath, Jason E. Experimental Study of Porosity Changes in Shale Caprocks Exposed to Carbon Dioxide-Saturated Brine II: Insights from Aqueous Geochemistry. United States. https://doi.org/10.1089/ees.2015.0592
Miller, Quin R. S., Wang, Xiuyu, Kaszuba, John P., Mouzakis, Katherine M., Navarre-Sitchler, Alexis K., Alvarado, Vladimir, McCray, John E., Rother, Gernot, Bañuelos, José Leobardo, and Heath, Jason E. Mon .
"Experimental Study of Porosity Changes in Shale Caprocks Exposed to Carbon Dioxide-Saturated Brine II: Insights from Aqueous Geochemistry". United States. https://doi.org/10.1089/ees.2015.0592. https://www.osti.gov/servlets/purl/1328308.
@article{osti_1328308,
title = {Experimental Study of Porosity Changes in Shale Caprocks Exposed to Carbon Dioxide-Saturated Brine II: Insights from Aqueous Geochemistry},
author = {Miller, Quin R. S. and Wang, Xiuyu and Kaszuba, John P. and Mouzakis, Katherine M. and Navarre-Sitchler, Alexis K. and Alvarado, Vladimir and McCray, John E. and Rother, Gernot and Bañuelos, José Leobardo and Heath, Jason E.},
abstractNote = {Laboratory experiments evaluated two shale caprock formations, the Gothic Shale and Marine Tuscaloosa Formation, at conditions relevant to carbon dioxide (CO2) sequestration. Both rocks were exposed to CO2-saturated brines at 160°C and 15 MPa for ~45 days. Baseline experiments for both rocks were pressurized with argon to 15 MPa for ~35 days. Varying concentrations of iron, aqueous silica, sulfate, and initial pH decreases coincide with enhanced carbonate and silicate dissolution due to reaction between CO2-saturated brine and shale. Saturation indices were calculated and activity diagrams were constructed to gain insights into sulfate, silicate, and carbonate mineral stabilities. We found that upon exposure to CO2-saturated brines, the Marine Tuscaloosa Formation appeared to be more reactive than the Gothic Shale. Evolution of aqueous geochemistry in the experiments is consistent with mineral precipitation and dissolution reactions that affect porosity. Finally, this study highlights the importance of tracking fluid chemistry to clarify downhole physicochemical responses to CO2 injection and subsequent changes in sealing capacity in CO2 storage and utilization projects.},
doi = {10.1089/ees.2015.0592},
journal = {Environmental Engineering Science},
number = ,
volume = ,
place = {United States},
year = {Mon Jul 18 00:00:00 EDT 2016},
month = {Mon Jul 18 00:00:00 EDT 2016}
}
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Works referencing / citing this record:
Water–rock–CO 2 interactions and CO 2 storage of Honghe tight oil reservoirs: an experimental and simulation study
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- Greenhouse Gases: Science and Technology, Vol. 9, Issue 4
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