Assertion (a): The Static Self-Potential for a thick, clean freshwater bearing sandstone formation is positive.

Q. Assertion (a): The Static Self-Potential for a thick, clean freshwater bearing sandstone formation is positive.

Reason(r): Resistivity of the formation water is less than the resistivity of salt water mud- filtrate.

A. Both (a) and (r) are true and (r) is the correct reason for (a).

B. Both (a) and (r) are true and (r) is not the correct reason for (a)

C. Both (a) and (r) are false.

D. (a) is true but (r) is false.

Ans: (a) is true but (r) is false.