A Misunderstanding of Low resistivity Pay Zone and Its Correction.
Li Houyi,Zhao Yufang, Cai Lin, et al ..
Formation water resistivity ( R w) of intervals of interest shonld be first determined while gaining water saturation of the intervals, than put it into Archie equation. R w is often different from oilbed bound water resistivity ( R wi ). I 2 often appears when I of the intervals is obtained from R w ,in this way,it is wrong to define oilbed as low resistivity pay zone. Log interpretation of terrestrial reservoir is not the same as that of marine reservoir.