Nanopore confinement effects on phase behavior and capillary pressure in a Wolfcamp shale reservoir

The capillary pressure curve in a real shale reservoir condition with a multicomponent Wolfcamp oil is the first time generated. The nanopore confinement causes significant effect on capillary pressure, which first increases with the increase of oil saturation (from 0 to 0.76) and then decreases. The finding that low capillary pressure in shale oil reservoir helps explain the observed low gas oil ratio during shale oil production.96