Patent ID: 8332155

Claim:
A computer-implemented method of characterizing hydrocarbon gas net pay zones in a subterranean reservoir, comprising: determining, via a computer processor, a sweet zone indicator based on well log data related to the reservoir; determining, via the computer processor, rock properties based on the well log data, wherein the rock properties comprise a total water saturation, an adsorbed gas saturation, a total gas content, a porosity, a propensity for hydraulic fracturing, an uncertainty level of the total water saturation, an uncertainty level of the total gas content, a porosity baseline for carbonate rocks present in the subterranean reservoir, and a total gas content baseline for rocks present in the subterranean reservoir; deriving, via the computer processor, one or more classes of net pay zones from the sweet zone indicator and the rock properties, wherein the one or more classes of net pay zones comprise one or more first-class net pay zones and wherein the first-class net pay zones have the sweet zone indicator greater than zero, the total gas content greater than a sum of the total gas content baseline for the rocks and the uncertainty level of the total gas content, the porosity greater than the porosity baseline for the carbonate rocks, the adsorbed gas saturation greater than the uncertainty level of the total water saturation and a large propensity for hydraulic fracture; and outputting, from the computer processor, the one or more net pay zones to identify areas of interest within the subterranean reservoir.