Influence of Pore Size Distribution on the Electrokinetic Coupling Coefficient in Two-Phase Flow Conditions

Streaming potential is a promising method for variety of hydrogeophysical applications, including the characterisation critical zone, contaminant transport or saline intrusion. A simple bundle capillary tubes model that accounts realistic pore and throat size distribution porous rocks presented in this paper to simulate electrokinetic coupling coefficient compared with previously published models. In contrast previous studies, non-monotonic function used our relies on experimental data Berea sandstone samples. approach, we combined explicit alternating radius each tube mimic pores throats real rocks. The simulation results obtained predicts water saturation dependence relative more accurately studies. Compared demonstrate remains stable at higher saturations but vanishes zero rapidly as approaches irreducible value. This prediction consistent data. Moreover, was accurate studies computing true value reported an study sample saturated tap liquid CO2. Further modifications, modelling trapping non-wetting phase, are required improve accuracy model.