Zeta potential of a natural clayey sandstone saturated with carbonated NaCl solutions at supercritical CO2 conditions

Miftah Hidayat* (Corresponding Author), Mohammad Sarmadivaleh, Jos Derksen, David Vega-Maza, Stefan Iglauer, Jan Vinogradov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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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
Number of pages10
JournalGeophysical Research Letters
Early online date8 Aug 2022
Publication statusPublished - 16 Aug 2022

Bibliographical note

Open Access via the Wiley Agreement
Miftah Hidayat was supported by the Aberdeen-Curtin PhD studentship. David Vega-Maza is funded by the Spanish Ministry of Science, Innovation and Universities (“Beatriz Galindo Senior” fellowship BEAGAL18/00259). Abbie McLaughlin from School of Natural and Computing Sciences and John Still from the School of Geoscience, University of Aberdeen are acknowledged for their assistance in the XRD and SEM analyses.

Data Availability Statement

Detailed information on rock sample preparation and petrophysical characterization is available for download in the Supporting Information S1. Summarized experimental data of San Saba sandstone in this study is available for download at https://doi.org/10.5281/zenodo.6477225.


  • Zeta potential
  • Intact natural sandstone
  • Carbonated NaCl solutions
  • Supercritical CO2 conditions
  • Effect of clays
  • Streaming potential method


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