Permeability, porosity, and mineral surface area changes in basalt cores induced by reactive transport of CO2-rich brine
Four reactive flow-through laboratory experiments (two each at 0.1 ml/min and 0.01 ml/min flow rates) at 150°C and 150 bar (15 MPa) are conducted on intact basalt cores to assess changes in porosity, permeability, and surface area caused by CO2-rich fluid-rock interaction. Permeability decreases sli...
| Main Authors: | , , , , , |
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| Format: | Journal article |
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Wiley
2017
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| _version_ | 1797061077627830272 |
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| author | Luhmann, A Tutolo, B Bagley, B Mildner, D Seyfried, W Saar, M |
| author_facet | Luhmann, A Tutolo, B Bagley, B Mildner, D Seyfried, W Saar, M |
| author_sort | Luhmann, A |
| collection | OXFORD |
| description | Four reactive flow-through laboratory experiments (two each at 0.1 ml/min and 0.01 ml/min flow rates) at 150°C and 150 bar (15 MPa) are conducted on intact basalt cores to assess changes in porosity, permeability, and surface area caused by CO2-rich fluid-rock interaction. Permeability decreases slightly during the lower flow rate experiments and increases during the higher flow rate experiments. At the higher flow rate, core permeability increases by more than one order of magnitude in one experiment and less than a factor of two in the other due to differences in preexisting flow path structure. X-ray computed tomography (XRCT) scans of pre- and post-experiment cores identify both mineral dissolution and secondary mineralization, with a net decrease in XRCT porosity of ∼0.7% – 0.8% for all four cores. (Ultra) small-angle neutron scattering ((U)SANS) datasets indicate an increase in both (U)SANS porosity and specific surface area (SSA) over the ∼ 1 nm- to 10 µm-scale range in post-experiment basalt samples, with differences due to flow rate and reaction time. Net porosity increases from summing XRCT and (U)SANS analyses are consistent with core mass decreases. (U)SANS data suggest an overall preservation of the pore structure with no change in mineral surface roughness from reaction, and the pore structure is unique in comparison to previously published basalt analyses. Together, these datasets illustrate changes in physical parameters that arise due to fluid-basalt interaction in relatively low pH environments with elevated CO2 concentration, with significant implications for flow, transport, and reaction through geologic formations. |
| first_indexed | 2024-03-06T20:25:56Z |
| format | Journal article |
| id | oxford-uuid:2f6691dc-e790-4106-9166-611300ddbb28 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T20:25:56Z |
| publishDate | 2017 |
| publisher | Wiley |
| record_format | dspace |
| spelling | oxford-uuid:2f6691dc-e790-4106-9166-611300ddbb282022-03-26T12:55:07ZPermeability, porosity, and mineral surface area changes in basalt cores induced by reactive transport of CO2-rich brineJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:2f6691dc-e790-4106-9166-611300ddbb28Symplectic Elements at OxfordWiley2017Luhmann, ATutolo, BBagley, BMildner, DSeyfried, WSaar, MFour reactive flow-through laboratory experiments (two each at 0.1 ml/min and 0.01 ml/min flow rates) at 150°C and 150 bar (15 MPa) are conducted on intact basalt cores to assess changes in porosity, permeability, and surface area caused by CO2-rich fluid-rock interaction. Permeability decreases slightly during the lower flow rate experiments and increases during the higher flow rate experiments. At the higher flow rate, core permeability increases by more than one order of magnitude in one experiment and less than a factor of two in the other due to differences in preexisting flow path structure. X-ray computed tomography (XRCT) scans of pre- and post-experiment cores identify both mineral dissolution and secondary mineralization, with a net decrease in XRCT porosity of ∼0.7% – 0.8% for all four cores. (Ultra) small-angle neutron scattering ((U)SANS) datasets indicate an increase in both (U)SANS porosity and specific surface area (SSA) over the ∼ 1 nm- to 10 µm-scale range in post-experiment basalt samples, with differences due to flow rate and reaction time. Net porosity increases from summing XRCT and (U)SANS analyses are consistent with core mass decreases. (U)SANS data suggest an overall preservation of the pore structure with no change in mineral surface roughness from reaction, and the pore structure is unique in comparison to previously published basalt analyses. Together, these datasets illustrate changes in physical parameters that arise due to fluid-basalt interaction in relatively low pH environments with elevated CO2 concentration, with significant implications for flow, transport, and reaction through geologic formations. |
| spellingShingle | Luhmann, A Tutolo, B Bagley, B Mildner, D Seyfried, W Saar, M Permeability, porosity, and mineral surface area changes in basalt cores induced by reactive transport of CO2-rich brine |
| title | Permeability, porosity, and mineral surface area changes in basalt cores induced by reactive transport of CO2-rich brine |
| title_full | Permeability, porosity, and mineral surface area changes in basalt cores induced by reactive transport of CO2-rich brine |
| title_fullStr | Permeability, porosity, and mineral surface area changes in basalt cores induced by reactive transport of CO2-rich brine |
| title_full_unstemmed | Permeability, porosity, and mineral surface area changes in basalt cores induced by reactive transport of CO2-rich brine |
| title_short | Permeability, porosity, and mineral surface area changes in basalt cores induced by reactive transport of CO2-rich brine |
| title_sort | permeability porosity and mineral surface area changes in basalt cores induced by reactive transport of co2 rich brine |
| work_keys_str_mv | AT luhmanna permeabilityporosityandmineralsurfaceareachangesinbasaltcoresinducedbyreactivetransportofco2richbrine AT tutolob permeabilityporosityandmineralsurfaceareachangesinbasaltcoresinducedbyreactivetransportofco2richbrine AT bagleyb permeabilityporosityandmineralsurfaceareachangesinbasaltcoresinducedbyreactivetransportofco2richbrine AT mildnerd permeabilityporosityandmineralsurfaceareachangesinbasaltcoresinducedbyreactivetransportofco2richbrine AT seyfriedw permeabilityporosityandmineralsurfaceareachangesinbasaltcoresinducedbyreactivetransportofco2richbrine AT saarm permeabilityporosityandmineralsurfaceareachangesinbasaltcoresinducedbyreactivetransportofco2richbrine |