Wettability is a key parameter of a reservoir rock system. The understanding of wettability plays a very important role in reservoir behavior and multiphase flow because it has a huge influence on the different petrophysical characteristics of the reservoir such as relative permeability and capillary pressure. Wettability is perhaps among one of the most important and crucial factors that affects the rate of oil recovery and residual oil saturation, and this is very important in the field of enhanced oil recovery. Wettability can be measured qualitatively and quantitatively. Qualitative methods include microscopic visualization of fluid distribution, relative permeability curves and imbibition methods and all these qualititative methods are indirectly inferred from other measurements while on the other hand quantitative methods are the direct measurements and wettability is measured on actual reservoir rock samples using reservoir fluids.