Fig. 4

Pickett plot for the determination of formation water resistivity (Rw) in Simian-1 well. The log–log crossplot of effective porosity (φeff) versus true formation resistivity (Rt) in the water-bearing zone yields a trendline whose intercept at 100% porosity gives an Rw value of 0.062 Ω·m, consistent with direct MDT sample measurements RW.