Patent ID: 7054749
Filing Date: 2006-05-30
Classification: G01V

Abstract:
1. A method to use porosity and water saturation logs from one of more wells to construct dimensionless capillary pressure functions for the purposes of indicating or identifying reservoir compartments, rock types or lithologies, comprising: constructing a permeability log via analytical equations, laboratory-derived correlations, or measured permeability logs; estimating fluid densities for reservoir fluids; estimating interfacial tension and contact angle; calculating the dimensionless capillary pressure functions as a function of measured water saturation for well log data from measurements of porosity and elevation, and from estimates of interfacial tension, contact angle, and permeability as a function of porosity; estimating the shape and extent of free water surfaces, for which the capillary pressure is zero; modifying or adding to shapes of the free water surfaces to identify reservoir compartments; and identifying rock types or lithologies through differences in the shapes of the dimensionless capillary pressure functions.