Which one of the following statements is INCORRECT with regard to Nuclear Magnetic Resonance (NMR) logging?

Q. Which one of the following statements is INCORRECT with regard to Nuclear Magnetic Resonance (NMR) logging? (ΦNMR – NMR derived total porosity, ΦD – Density porosity)

(A)The relaxation time (T2) decreases with decrease in pore size.

(B)The ΦNMR is greater than ΦD in a water saturated sandstone formation.

(C)The NMR logs provide lithology independent measurement of total porosity.

(D)The ΦNMR is less than ΦD in a gas saturated shaly sandstone formation.

Ans: The ΦNMR is greater than ΦD in a water saturated sandstone formation.