Updated: Sep 21
The contact angle measured through the water phase measures 10°, what can qualitatively be said about the wettability of the rock surface?
(a) It is water wet
(b) It is oil wet
(c) It is strongly water wet
(d) It is strongly oil-wet
Difficulty Level: Medium
NCEES Topic/Subtopic: Reservoir/Rock Properties
Comment: The closer the contact angle is to 0° the more strongly water wet the rock surface is and the closer it is to 180° the more strongly oil-wet the rock surface is.
Answer & Reference(s): (C): Page. 13 – 20. The Reservoir Engineering Aspects of Waterflooding, Forrest F. Craig. Jr. (1993)