CO2-induced chemo-mechanical alteration in reservoir rocks assessed via batch reaction experiments and scratch testing
Abstract
Here, the injection of carbon dioxide (CO2) into geological formations results in a chemical re-equilibration between the mineral assemblage and the pore fluid, with ensuing mineral dissolution and re-precipitation. Hence, target rock formations may exhibit changes of mechanical and petrophysical properties due to CO2 exposure. We conducted batch reaction experiments with Entrada Sandstone and Summerville Siltstone exposed to de-ionized water and synthetic brine under reservoir pressure (9–10 MPa) and temperature (80°C) for up to four weeks. Samples originate from the Crystal Geyser field site, where a naturally occurring CO2 seepage alters portions of these geologic formations. We conducted micro-scratch tests on rock samples without alteration, altered under laboratory conditions, and naturally altered over geologic time. Scratch toughness and hardness decrease as a function of exposure time and water salinity up to 52% in the case of Entrada and 87% in the case of Summerville after CO2-induced alteration in the laboratory. Imaging of altered cores with SEM-EDS and X-ray microCT methods show dissolution of carbonate and silica cements and matrix accompanied by minor dissolution of Fe-oxides, clays, and other silicates. Parallel experiments using powdered samples confirm that dissolution of carbonate and silica are the primary reactions. The batch reaction experiments inmore »
- Authors:
-
- The Univ. of Texas at Austin, Austin, TX (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Frontiers of Subsurface Energy Security (CFSES)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1399569
- Alternate Identifier(s):
- OSTI ID: 1393992
- Report Number(s):
- SAND-2017-9043J
Journal ID: ISSN 2152-3878; 656485
- Grant/Contract Number:
- AC04-94AL85000
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Greenhouse Gases: Science and Technology
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2152-3878
- Publisher:
- Society of Chemical Industry, Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; micromechanics; chemo-mechanical coupling; dissolution; scratch toughness; carbon storage
Citation Formats
Aman, Michael, Espinoza, D. Nicolas, Ilgen, Anastasia G., Major, Jonathan R., Eichhubl, Peter, and Dewers, Thomas A. CO2-induced chemo-mechanical alteration in reservoir rocks assessed via batch reaction experiments and scratch testing. United States: N. p., 2017.
Web. doi:10.1002/ghg.1726.
Aman, Michael, Espinoza, D. Nicolas, Ilgen, Anastasia G., Major, Jonathan R., Eichhubl, Peter, & Dewers, Thomas A. CO2-induced chemo-mechanical alteration in reservoir rocks assessed via batch reaction experiments and scratch testing. United States. https://doi.org/10.1002/ghg.1726
Aman, Michael, Espinoza, D. Nicolas, Ilgen, Anastasia G., Major, Jonathan R., Eichhubl, Peter, and Dewers, Thomas A. Fri .
"CO2-induced chemo-mechanical alteration in reservoir rocks assessed via batch reaction experiments and scratch testing". United States. https://doi.org/10.1002/ghg.1726. https://www.osti.gov/servlets/purl/1399569.
@article{osti_1399569,
title = {CO2-induced chemo-mechanical alteration in reservoir rocks assessed via batch reaction experiments and scratch testing},
author = {Aman, Michael and Espinoza, D. Nicolas and Ilgen, Anastasia G. and Major, Jonathan R. and Eichhubl, Peter and Dewers, Thomas A.},
abstractNote = {Here, the injection of carbon dioxide (CO2) into geological formations results in a chemical re-equilibration between the mineral assemblage and the pore fluid, with ensuing mineral dissolution and re-precipitation. Hence, target rock formations may exhibit changes of mechanical and petrophysical properties due to CO2 exposure. We conducted batch reaction experiments with Entrada Sandstone and Summerville Siltstone exposed to de-ionized water and synthetic brine under reservoir pressure (9–10 MPa) and temperature (80°C) for up to four weeks. Samples originate from the Crystal Geyser field site, where a naturally occurring CO2 seepage alters portions of these geologic formations. We conducted micro-scratch tests on rock samples without alteration, altered under laboratory conditions, and naturally altered over geologic time. Scratch toughness and hardness decrease as a function of exposure time and water salinity up to 52% in the case of Entrada and 87% in the case of Summerville after CO2-induced alteration in the laboratory. Imaging of altered cores with SEM-EDS and X-ray microCT methods show dissolution of carbonate and silica cements and matrix accompanied by minor dissolution of Fe-oxides, clays, and other silicates. Parallel experiments using powdered samples confirm that dissolution of carbonate and silica are the primary reactions. The batch reaction experiments in the autoclave utilize a high fluid to rock volume ratio and represent an end member of possible alteration associated with CO2 storage systems. These types of tests serve as a pre-screening tool to identify the susceptibility of rock facies to CO2-related chemical-mechanical alteration during long-term CO2 storage.},
doi = {10.1002/ghg.1726},
journal = {Greenhouse Gases: Science and Technology},
number = 1,
volume = 8,
place = {United States},
year = {2017},
month = {9}
}
Web of Science
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