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Title: Permeability, porosity, and mineral surface area changes in basalt cores induced by reactive transport of CO2-rich brine

Journal Article · · Water Resources Research
DOI:https://doi.org/10.1002/2016WR019216· OSTI ID:1466025
ORCiD logo [1];  [2];  [3];  [4]; ORCiD logo [3];  [5]
  1. New Mexico Institute of Mining and Technology, Socorro, NM (United States); Univ. of Minnesota, Minneapolis, MN (United States)
  2. Univ. of Minnesota, Minneapolis, MN (United States); Univ. of Oxford, Oxford (United Kingdom)
  3. Univ. of Minnesota, Minneapolis, MN (United States)
  4. National Institute of Standards and Technology, Gaithersburg, MD (United States)
  5. Univ. of Minnesota, Minneapolis, MN (United States); ETH-Zurich, Zurich (Switzerland)

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 the larger pores in all four cores. (Ultra) small–angle neutron scattering ((U)SANS) data sets 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 porosity changes from 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. Altogether, these data sets 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.

Research Organization:
Univ. of Minnesota, Minneapolis (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Geothermal Technologies Office
Grant/Contract Number:
EE0002764
OSTI ID:
1466025
Journal Information:
Water Resources Research, Vol. 53, Issue 3; ISSN 0043-1397
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 56 works
Citation information provided by
Web of Science

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Cited By (5)

The Impact of Mineral Dissolution on Drainage Relative Permeability and Residual Trapping in Two Carbonate Rocks journal November 2019
CO 2 ‐Saturated Brine Injection Into Unconsolidated Sandstone: Implications for Carbon Geosequestration journal November 2019
Permeability Prediction in Rocks Experiencing Mineral Precipitation and Dissolution: A Numerical Study journal April 2019
Simulation of mineral dissolution at the pore scale with evolving fluid-solid interfaces: review of approaches and benchmark problem set journal January 2020
A review of geochemical–mechanical impacts in geological carbon storage reservoirs journal May 2019