Below are log plots of porosity and resistivity for a reservoir interval between depths of 1725 and 1765m. Calculate water saturation in the uninvaded zone (Sw) and water saturation in the flushed zone (Sxo) using Archie’s equation for each 1.0m interval, then show (as curve lines vs. depth) the Sw, residual hydrocarbon saturation (Shr), and moveable hydrocarbon saturation (Shm) on the same track. Discuss the final result in detail.

Notes: Rw=0.05 ohm.m, Rmf=0.47 ohm.m, a=1.0, m=2.0, n=2.0. The well has been drilled with fresh water mud.

 

OND 0.05 0.1 0.15 0.2 0.25 0.3 1725 1730 1735 1740 Depth (m) 1745 1750 1755 1760 1765