The estimation of petrophysical parameters of reservoir which includes porosity, saturation and permeability, is the first and the most important step in an accurate evaluation and modeling of reservoirs. Porosity and saturation can be determined by row petrophysical logs and core analysis, meanwhile permeability only can be measured by the core analysis. For economic and technical reasons it’s impossible to take cores in all wells in a field or even completely in the depth of a well, so the estimation of permeability is necessary on the basis of petrophysical logs and core data.
In this study fuzzy logic is used as a new and strong way in estimation of permeability by using petrophysical logs in one of the heterogeneous reservoirs in Iran.