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,...
Main Authors: | , , , |
---|---|
Format: | Text |
Language: | English |
Published: |
2021
|
Subjects: | |
Online Access: | https://doi.org/10.5194/se-2021-114 https://se.copernicus.org/preprints/se-2021-114/ |
id |
ftcopernicus:oai:publications.copernicus.org:sed97616 |
---|---|
record_format |
openpolar |
spelling |
ftcopernicus:oai:publications.copernicus.org:sed97616 2023-05-15T16:51:02+02:00 Creep of CarbFix Basalt: Influence of Rock-fluid Interaction Xing, Tiange Ghaffari, Hamed Mok, Ulrich Pec, Matej 2021-09-09 application/pdf https://doi.org/10.5194/se-2021-114 https://se.copernicus.org/preprints/se-2021-114/ eng eng doi:10.5194/se-2021-114 https://se.copernicus.org/preprints/se-2021-114/ eISSN: 1869-9529 Text 2021 ftcopernicus https://doi.org/10.5194/se-2021-114 2021-09-13T16:22:27Z 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 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 ultimate failure strength, well below the stress level at the onset of bulk dilatancy. 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 sub-critical 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. Text Iceland Copernicus Publications: E-Journals |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
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 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 ultimate failure strength, well below the stress level at the onset of bulk dilatancy. 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 sub-critical 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 |
Text |
author |
Xing, Tiange Ghaffari, Hamed Mok, Ulrich Pec, Matej |
spellingShingle |
Xing, Tiange Ghaffari, Hamed Mok, Ulrich Pec, Matej Creep of CarbFix Basalt: Influence of Rock-fluid Interaction |
author_facet |
Xing, Tiange Ghaffari, Hamed 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 |
publishDate |
2021 |
url |
https://doi.org/10.5194/se-2021-114 https://se.copernicus.org/preprints/se-2021-114/ |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
eISSN: 1869-9529 |
op_relation |
doi:10.5194/se-2021-114 https://se.copernicus.org/preprints/se-2021-114/ |
op_doi |
https://doi.org/10.5194/se-2021-114 |
_version_ |
1766041150109515776 |