Actually,the wettability of a system can range from strongly water-wet to strongly oil-wet depending on the brined interactions with the rock surface.If no preference is shown by the rock to either fluid,the system is said to exhibit neutral wettability or intermediate wettability,a condition that one might visualize as being equally wet by both fluids (50%/50%wettability).Actually, the wettability of a system can range from strongly water-wet to strongly oil-wet depending on the brined interactions with the rock surface. If no preference is shown by the rock to either fluid, the system is said to exhibit neutral wettability or intermediate wettability, a condition that one might visualize as being equally wet by both fluids (50%/50% wettability)