Commercial oil and gas production requires the presence of hydrocarbons and the ability of the reservoir to give them up.

Property value is related to the magnitude of hydrocarbon concentration and reservoir permeability. Of course, other factors, such as the relative position of a possible critical water-saturation level, well depth, and the efficiency of exploration and reservoir development, also are important.

To look for hydrocarbons, it is logical to map hydrocarbon concentration project trends. To predict production rates from proposed wells, it is logical to map permeability from existing well data and project permeability trends. These mapping parameters are derived easily from well-log data. Such maps may bear little resemblance to isopach and structure maps of the same reservoir.

Hydrocarbon concentration and permeability mapping are vastly superior to those obtained by conventional structural and isopach mapping techniques in some places.

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