Fines content plays an important role in the properties of two-size particle mixtures, for example sand-gravel, sand-silt and sand-clay. The determination of the porosity or void ratio based on the fines content is useful for characterization of the properties of such mixtures. The application of petrophysical and geotechnical models for binary packing materials are discussed in this study. The geotechnical model was used to predict the geophysical properties of sandstones with different amounts of fines. This study suggests a good potential to use this model for interpreting geophysical properties of sediments.