Patent ID: 8311789

Claim:
A method for developing petrophysical models for use with well log measurement data from a predetermined set of logging tools, wherein said predetermined set includes logging tools for determining water saturation and permeability values in a reservoir, the method comprising: providing to a processor predetermined error ranges associated with each logging tool in the set; executing a predetermined software program in said processor to implement Monte Carlo numerical analysis of the predetermined error ranges to determine error distribution data; executing a predetermined software program in said processor to derive saturation uncertainty modeled values and permeability uncertainty modeled values based on such error distribution data; and executing a predetermined software program in said processor to calibrate the saturation uncertainty modeled values and permeability uncertainty modeled values against data obtained from actual flow tests to develop petrophysical models which, when used with actual logging data, determine whether a location at which such logging measurements were taken is a hydrocarbon productive, non-productive, or undetermined productivity zone, wherein the predetermined set of logging tools further includes tools for determining permeability of the reservoir by providing actual well log measurements to solve the equation (3): K = [ 200 ⁢ ( Φ 4.5 ) Sw 2 ] , ( 3 ) where K is the permeability in milliDarcies (md), Φ is the calculated porosity from the actual well log measurements, and Sw is the water saturation.