Log analysis of a number of Western Canada oil and gas reservoirs has yielded sufficient date to establish some petrophysical relationships for use in the area. The solution of the Archie saturation equation illustrates that for each reservoir the degree of oil (gas) zone definition is highly variable. The variability is so marked that individual values of water saturaion may only be useful when analogous data is available for reference. In the clay sand or chalky limestone reservoirs of Western Canada water saturation calculations from logs may tions suggest that sandstone travel times are influenced appreciably by cement type and not by depth. The acoustic travel time log is of limited use in the unconsolidated sands of the Western Canada area. Log density-porosity relationships are found to be inconsistent in carbonates but useful in sandstones. Log derived matrix densities are found to be quite different from the theoretical matrix densities for some rocks studied. be of very limited use. Results of travel time-porosity correlaPermeability-porosity relationships appear to be markedly affected by depth in sandstones and controlled by pore system type in carbonates.

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