Wettability Forecast of Reservoirs Using Log Data.
Xie Ranghong,Gao Guozhong and Feng Qining, et al..
Laboratory measurements of electrical properties and wettability on cores have shown Archie's saturation exponent n is greatly affected by wettability. A linear relationship exists between the logarithm of saturation exponent n and relative wettability index,which provides the basis for forecasting the wettability of reservoirs using saturation exponent. Saturation exponent n (vs) depth curve is given through Electmagnetic Propagation Tool (EPT) and Microspherical Focused Log (MSFL), from which the changes of wettability with depth will be forecasted. The processed result of in-site log data shows this method can quickly and immediately indicate the changes of reservoir's wettability.