Zeta Potential of a Natural Clayey Sandstone Saturated With Carbonated NaCl Solutions at Supercritical CO2 Conditions

Miftah Hidayat, Mohammad Sarmadivaleh, Jos Derksen, David Vega-Maza, Stefan Iglauer, Jan Vinogradov

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The zeta potential is a measure of electric potential at the mineral-electrolyte interfaces. The zeta potential of natural sandstones depends on mineralogy, electrolyte pH, concentration, composition, amount of dissolved CO2, and temperature. We report for the first time the zeta potential measured on clayey sandstone comprising quartz, kaolinite, illite, albite and microcline saturated with NaCl solutions at supercritical CO2 conditions. Our results demonstrate that zeta potentials in clayey sandstone samples at supercritical CO2 conditions are significantly different from similar measurements conducted under ambient conditions and from those obtained with clean sandstones. Supercritical CO2 zeta potential remains negative but is influenced by clays and feldspars due to their significant presence and exposure to large pores, which yields less negative zeta potential compared to quartz, under identical conditions. Our results have significant implications to natural subsurface systems such as CO2 geo-sequestration sites, aquifers, geothermal sources and hydrocarbon reservoirs.

Original languageEnglish
Article numbere2022GL099277
JournalGeophysical Research Letters
Volume49
Issue number15
DOIs
StatePublished - 16 Aug 2022
Externally publishedYes

Keywords

  • carbonated NaCl solutions
  • effect of clays
  • intact natural sandstone
  • streaming potential method
  • supercritical CO conditions
  • zeta potential

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