CO2 wettability of rock and implications for core-flooding

Abstract

Rock became more CO2 wet with increasing pressure, temperature and brine salinities and less CO2 wet with increasing surface roughness - i.e. a lower storage capacity can be inferred for structural trapping. Moreover, we demonstrate that gas densities correlate remarkably well with wettability also a physical model was developed to provide a theoretical framework. Furthermore, the permeability of sandstone samples reduced after injection of brine, CO2-saturated brine or supercritical CO2 at reservoir conditions.