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 improve...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Copernicus GmbH
2023
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| Online Access: | https://hdl.handle.net/1721.1/148151 |
| _version_ | 1826196682428121088 |
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| author | Xing, Tiange Ghaffari, Hamed O Mok, Ulrich Pec, Matej |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Xing, Tiange Ghaffari, Hamed O Mok, Ulrich Pec, Matej |
| author_sort | Xing, Tiange |
| collection | MIT |
| description | <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> |
| first_indexed | 2024-09-23T10:33:18Z |
| format | Article |
| id | mit-1721.1/148151 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T10:33:18Z |
| publishDate | 2023 |
| publisher | Copernicus GmbH |
| record_format | dspace |
| spelling | mit-1721.1/1481512023-02-23T03:35:36Z 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 <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> 2023-02-22T17:44:02Z 2023-02-22T17:44:02Z 2022 2023-02-22T17:26:38Z Article http://purl.org/eprint/type/JournalArticle 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). en 10.5194/SE-13-137-2022 Solid Earth Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf Copernicus GmbH Copernicus Publications |
| spellingShingle | Xing, Tiange Ghaffari, Hamed O Mok, Ulrich Pec, Matej Creep of CarbFix basalt: influence of rock–fluid interaction |
| title | 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_short | Creep of CarbFix basalt: influence of rock–fluid interaction |
| title_sort | creep of carbfix basalt influence of rock fluid interaction |
| url | https://hdl.handle.net/1721.1/148151 |
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