Physical rock properties from wireline logs acquired in several wells that intersect volcanic and sedimentary rocks in the Nechako Basin have been compiled. Different rock types can be classified based on their distinct geophysical rock property characteristics. Porosity, resistivity, density, compressional velocities and acoustic impedance of volcanic rocks are distinctly different from those of sedimentary rocks suggesting that they can be successfully imaged by geophysical techniques such as seismic, magnetotelluric and gravity. Empirical relationships between porosity, resistivity, density and compressional velocities were established. These relationships provide a means of comparing models from datasets acquired from surface seismic, magnetotellurics and gravity measurements.