Which one of the following is CORRECT for the density porosity (fD) and neutron porosity (fN) estimated for a finely interbedded organic-rich

Q. Which one of the following is CORRECT for the density porosity (fD) and neutron porosity (fN) estimated for a finely interbedded organic-rich, shaly sandstone formation relative to those for a shale-free sandstone formation at shallow depths?

(A) ΦN decreases and ΦD increases.

(B) ΦN increases and ΦD decreases.

(C) Both ΦN and ΦD decrease.

(D) Both ΦN and ΦD increase.

Ans: Both ΦN and ΦD increase.