cementation exponent — Oil & Gas Glossary

The exponent of porosity, m, in the relation of formation factor, F, to porosity, phi. In the Archie equation, F = 1 / phim, H. Guyod termed m the cementation exponent because m was observed to be higher in cemented rock. The more general term is porosity exponent.Reference:Guyod H: Fundamental Data for the Interpretation of Electric Logs, The Oil Weekly