Creep of CarbFix basalt: influence of rock–fluid interaction
<jats:p>Abstract. Geological carbon sequestration provides permanent CO2 storage to mitigate the current high concentration of CO2 in the atmosphere. CO2 mineralization in basalts has been proven to be one of the most secure storage options. For successful implementation and future improvement...
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ftmit:oai:dspace.mit.edu:1721.1/148151 2023-06-11T04:13:10+02:00 Creep of CarbFix basalt: influence of rock–fluid interaction Xing, Tiange Ghaffari, Hamed O Mok, Ulrich Pec, Matej Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences 2023-02-22T17:26:38Z application/pdf https://hdl.handle.net/1721.1/148151 en eng Copernicus GmbH 10.5194/SE-13-137-2022 Solid Earth https://hdl.handle.net/1721.1/148151 Xing, Tiange, Ghaffari, Hamed O, Mok, Ulrich and Pec, Matej. 2022. "Creep of CarbFix basalt: influence of rock–fluid interaction." Solid Earth, 13 (1). Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ Copernicus Publications Article http://purl.org/eprint/type/JournalArticle 2023 ftmit 2023-05-29T08:20:36Z <jats:p>Abstract. Geological carbon sequestration provides permanent CO2 storage to mitigate the current high concentration of CO2 in the atmosphere. CO2 mineralization in basalts has been proven to be one of the most secure storage options. For successful implementation and future improvements of this technology, the time-dependent deformation behavior of reservoir rocks in the presence of reactive fluids needs to be studied in detail. We conducted load-stepping creep experiments on basalts from the CarbFix site (Iceland) under several pore fluid conditions (dry, H2O saturated and H2O + CO2 saturated) at temperature, T≈80 ∘C and effective pressure, Peff=50 MPa, during which we collected mechanical, acoustic and pore fluid chemistry data. We observed transient creep at stresses as low as 11 % of the failure strength. Acoustic emissions (AEs) correlated strongly with strain accumulation, indicating that the creep deformation was a brittle process in agreement with microstructural observations. The rate and magnitude of AEs were higher in fluid-saturated experiments than in dry conditions. We infer that the predominant mechanism governing creep deformation is time- and stress-dependent subcritical dilatant cracking. Our results suggest that the presence of aqueous fluids exerts first-order control on creep deformation of basaltic rocks, while the composition of the fluids plays only a secondary role under the studied conditions. </jats:p> Article in Journal/Newspaper Iceland DSpace@MIT (Massachusetts Institute of Technology) |
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<jats:p>Abstract. Geological carbon sequestration provides permanent CO2 storage to mitigate the current high concentration of CO2 in the atmosphere. CO2 mineralization in basalts has been proven to be one of the most secure storage options. For successful implementation and future improvements of this technology, the time-dependent deformation behavior of reservoir rocks in the presence of reactive fluids needs to be studied in detail. We conducted load-stepping creep experiments on basalts from the CarbFix site (Iceland) under several pore fluid conditions (dry, H2O saturated and H2O + CO2 saturated) at temperature, T≈80 ∘C and effective pressure, Peff=50 MPa, during which we collected mechanical, acoustic and pore fluid chemistry data. We observed transient creep at stresses as low as 11 % of the failure strength. Acoustic emissions (AEs) correlated strongly with strain accumulation, indicating that the creep deformation was a brittle process in agreement with microstructural observations. The rate and magnitude of AEs were higher in fluid-saturated experiments than in dry conditions. We infer that the predominant mechanism governing creep deformation is time- and stress-dependent subcritical dilatant cracking. Our results suggest that the presence of aqueous fluids exerts first-order control on creep deformation of basaltic rocks, while the composition of the fluids plays only a secondary role under the studied conditions. </jats:p> |
author2 |
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
format |
Article in Journal/Newspaper |
author |
Xing, Tiange Ghaffari, Hamed O Mok, Ulrich Pec, Matej |
spellingShingle |
Xing, Tiange Ghaffari, Hamed O Mok, Ulrich Pec, Matej Creep of CarbFix basalt: influence of rock–fluid interaction |
author_facet |
Xing, Tiange Ghaffari, Hamed O Mok, Ulrich Pec, Matej |
author_sort |
Xing, Tiange |
title |
Creep of CarbFix basalt: influence of rock–fluid interaction |
title_short |
Creep of CarbFix basalt: influence of rock–fluid interaction |
title_full |
Creep of CarbFix basalt: influence of rock–fluid interaction |
title_fullStr |
Creep of CarbFix basalt: influence of rock–fluid interaction |
title_full_unstemmed |
Creep of CarbFix basalt: influence of rock–fluid interaction |
title_sort |
creep of carbfix basalt: influence of rock–fluid interaction |
publisher |
Copernicus GmbH |
publishDate |
2023 |
url |
https://hdl.handle.net/1721.1/148151 |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Copernicus Publications |
op_relation |
10.5194/SE-13-137-2022 Solid Earth https://hdl.handle.net/1721.1/148151 Xing, Tiange, Ghaffari, Hamed O, Mok, Ulrich and Pec, Matej. 2022. "Creep of CarbFix basalt: influence of rock–fluid interaction." Solid Earth, 13 (1). |
op_rights |
Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ |
_version_ |
1768389888734920704 |