Creep of CarbFix basalt: influence of rock–fluid interaction
Geological carbon sequestration provides permanent CO 2 storage to mitigate the current high concentration of CO 2 in the atmosphere. CO 2 mineralization in basalts has been proven to be one of the most secure storage options. For successful implementation and future improvements of this technology,...
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2022
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ftdoajarticles:oai:doaj.org/article:83948df860164992b79d55ad6bbc5956 2023-05-15T16:51:01+02:00 Creep of CarbFix basalt: influence of rock–fluid interaction T. Xing H. O. Ghaffari U. Mok M. Pec 2022-01-01T00:00:00Z https://doi.org/10.5194/se-13-137-2022 https://doaj.org/article/83948df860164992b79d55ad6bbc5956 EN eng Copernicus Publications https://se.copernicus.org/articles/13/137/2022/se-13-137-2022.pdf https://doaj.org/toc/1869-9510 https://doaj.org/toc/1869-9529 doi:10.5194/se-13-137-2022 1869-9510 1869-9529 https://doaj.org/article/83948df860164992b79d55ad6bbc5956 Solid Earth, Vol 13, Pp 137-160 (2022) Geology QE1-996.5 Stratigraphy QE640-699 article 2022 ftdoajarticles https://doi.org/10.5194/se-13-137-2022 2022-12-31T16:30:42Z Geological carbon sequestration provides permanent CO 2 storage to mitigate the current high concentration of CO 2 in the atmosphere. CO 2 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, H 2 O saturated and H 2 O + CO 2 saturated) at temperature, T ≈80 ∘ C and effective pressure, P eff =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. Article in Journal/Newspaper Iceland Directory of Open Access Journals: DOAJ Articles Solid Earth 13 1 137 160 |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geology QE1-996.5 Stratigraphy QE640-699 |
spellingShingle |
Geology QE1-996.5 Stratigraphy QE640-699 T. Xing H. O. Ghaffari U. Mok M. Pec Creep of CarbFix basalt: influence of rock–fluid interaction |
topic_facet |
Geology QE1-996.5 Stratigraphy QE640-699 |
description |
Geological carbon sequestration provides permanent CO 2 storage to mitigate the current high concentration of CO 2 in the atmosphere. CO 2 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, H 2 O saturated and H 2 O + CO 2 saturated) at temperature, T ≈80 ∘ C and effective pressure, P eff =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. |
format |
Article in Journal/Newspaper |
author |
T. Xing H. O. Ghaffari U. Mok M. Pec |
author_facet |
T. Xing H. O. Ghaffari U. Mok M. Pec |
author_sort |
T. Xing |
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 Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/se-13-137-2022 https://doaj.org/article/83948df860164992b79d55ad6bbc5956 |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Solid Earth, Vol 13, Pp 137-160 (2022) |
op_relation |
https://se.copernicus.org/articles/13/137/2022/se-13-137-2022.pdf https://doaj.org/toc/1869-9510 https://doaj.org/toc/1869-9529 doi:10.5194/se-13-137-2022 1869-9510 1869-9529 https://doaj.org/article/83948df860164992b79d55ad6bbc5956 |
op_doi |
https://doi.org/10.5194/se-13-137-2022 |
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Solid Earth |
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13 |
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1 |
container_start_page |
137 |
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160 |
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1766041125174378496 |