Saturations (So, Sw, Sg) are also required for each cell; as with pressures, they may be directly assigned to cells; however, if the saturations are known at any given datum (usually the gas oil contact and water oil contact), they may be determined at equilibrium based on capillary pressures for each cell. For example, to determine the oil and water saturations 10 feet above the water oil contact (defined in this example as 100% water) for a 50 lb/ft3 oil and 65 lb/ft3 water, the water oil capillary pressure, at the contact, is 0 psi (since no oil present). If the pressure at the WOC is 3000 psi (which is a water pressure)?