Dear friend,

I am working a petrophysic project, and the well I work with is using Oil Base Mud (OBM).

I have several Questions actually.

1. When I using geolog, it will ask the Rmf (Res of mud filtrate) and Rmc (Res of mud cake). Since OBM well using oil as drilling fluid, i dont think It have Rmf and Rmc. How can I ignore geolog for asking Rmf and Rmc?
2. Why do we need calculate saturation in invaded zone?