An Improved Method for Estimating Capillary Pressure from 3D Microtomography Images and its Application to the Study of Disconnected Nonwetting Phase

•Improved estimates of interfacial curvature significantly advances the potential to unravel phenomena associated with multi-phase flow.•The approach combines selective interface modification and distance weighting approaches and is verified against synthetic and real data.•We demonstrate significant improvement over previous methods.•Pressure of disconnected, non-wetting phase is controlled more by pore geometry, and less by bulk liquid phase behavior.