Capillary pressure model predicts distance to gas/water, oil/water contact

Gas/water and oil/water contacts can be predicted by a method based on a new capillary pressure model that relates four quantities: porosity, water saturation, air permeability, and capillary pressure. This advanced capillary pressure method, Adcap, provides integration of laboratory-measured capillary pressure (P[sub c]) data with routine log and core analysis. In the absence of laboratory P[sub c] data, the model depends on correlations from data obtained worldwide. Water levels are predicted through regression analysis using porosity and water saturation from log and/or core analysis. An important statistical result of the regression analysis is that an error range can be assigned to the predicted water level.