The directional dependence of reservoir properties was measured on oriented plugs cut from six samples of MWX-3 core. Properties measured by special core analysis included porosity , permeability and pore volume compressibility under conditions of in-situ net confining stress representative of both virgin reservoir conditions and 50% drawdown. Results of the analysis indicated virtually no correlation of porosity or pore volume compressibility with direction. however, were as much as 77% greater in the direction orthogonal to maximum principal stress when compared to those parallel to maximum principal stress. Although characteristic flow path widths were found to be similar in both directions, flow path tortuosities were significantly lower in the higher permeability direction. This lower tortuosity orthogonal to maximum principal stress may be the result of pressure solution of quartz grain contacts. Vertical permeabilities were lower than the horizontal values in cores from the and coastal zones. This is presumed to be due to the presence of thin coaly or shaly laminae crossing the entire width of the vertical plugs. These laminae run lengthwise in the horizontal plugs and present little or no barrier to gas flow. Vertical permeabllities in the fluvial zone were as high or higher than the horizontal values, possibly because of cross-bedding in these cores which prevents the formation of permeability barriers in vertical plugs.