A single well encounters multiple clean sands of exactly the same thickness porosity and permeability

Q. A single well encounters multiple clean sands of exactly the same thickness, porosity and permeability. Rw is the formation fluid resistivity and Rmf is the mud filtrate resistivity.

P. Rmf > Rw                                    I.    No deflection

Q. Rmf = Rw                                   II. Positive deflection

R. Rmf < Rw                                    III. Negative deflection

Which one of the following match the relation between Rw and Rmf to that of Self Potential (SP) log deflection?

(A) P-I, Q-III, R-II                                  

(B) P-III, Q-I, R-II

(C) P-II, Q-I, R-III                     

(D) P-I, Q-II, R-III

Ans: P-III, Q-I, R-II