Calcite-fluid interfacial tension: H2 and CO2 geological storage in carbonates

Document Type

Journal Article

Publication Title

Energy and Fuels


American Chemical Society


School of Engineering




Hosseini, M., Ali, M., Fahimpour, J., Keshavarz, A., & Iglauer, S. (2023). Calcite-fluid interfacial tension: H2 and CO2 geological storage in carbonates. Energy & Fuels, 37(8), 5986-5994.


Underground hydrogen storage (UHS) and CO2 geological storage (CGS) are two outstanding techniques for meeting the universal energy demand and reducing anthropogenic greenhouse gases (GHGs). In this context, the calcite-fluid interfacial tension (γcalcite-fluid) is a critical parameter for gas s torage in carbonate formations as it affects the spreading and flow of fluids in porous media, gas injection/withdrawal rate, gas storage capacity, and containment safety. However, there is a scarcity of γcalcite-fluid data (e.g., γcalcite-gas and γcalcite-water for carbonate/gas/water systems) at geological conditions in the literature. In addition, there is no independent experimental method to measure γrock-fluid; thus, advancing and receding contact angles are often used to calculate it by a combination of Neumann’s equation of state and Young’s equation. We, therefore, theoretically calculated γcalcite-fluid as a function of the main geological parameters, including temperature, pressure, organic acid concentration, and salinity for calcite/H2/water and calcite/CO2/water systems. We recognized that γcalcite-gas decreased with pressure, salinity, and organic acid concentration but increased with temperature. Also, a slight increase in γcalcite-water with organic acid concentration and salinity was noticed at 15 MPa, 323.15 K, and 10 MPa, 323.15 K, respectively. However, γcalcite-water slightly decreased with temperature, assuming that it remained constant with pressure. Furthermore, the values of γcalcite-fluid for a H2/brine system were more than those for a CO2/brine system. This work thus provides a deep understanding of the wetting characteristics at calcite/H2/water and calcite/CO2/water interfaces and leads to a better investigation of H2/CO2 storage in carbonate formations.



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