Capillary Pressure Curves

Example capillary pressure curves for Council Grove and Mesavede-Frontier rocks illustrate that within each rock type the saturation at any given capillary pressure generally decreases with increasing porosity and permeability, as seen in many formations. Comparison between rock type figures shows that as porosity and permeability generally increase with increasing grain size, the pressure at which principal desaturation occurs decreases (the curves flatten
towards the X axis) and the irreducible saturations decrease.