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Line 16: − [[File:M91FG24.JPG|thumb|300px|{{figure number|1}}Wetting and nonwetting relationships between fluids and rocks have a major effect on the static and dynamic behavior of hydrocarbons in reservoirs.]]+ − + − [[File:M91FG25.JPG|thumb|300px|{{figure number|2}}In a water-wet reservoir, water wets the surface of the grains, and hydrocarbons occupy the central parts of the pore space. Moving water will displace the oil from the center of the pores (from Clark et al., 1958). Reprinted with permission from the Society of Petroleum Engineers.]]+ +
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==Wettability==
==Wettability==
<gallery mode=packed heights=300px widths=300px>
M91FG24.JPG|{{figure number|1}}Wetting and nonwetting relationships between fluids and rocks have a major effect on the static and dynamic behavior of hydrocarbons in reservoirs.
M91FG25.JPG|{{figure number|2}}In a water-wet reservoir, water wets the surface of the grains, and hydrocarbons occupy the central parts of the pore space. Moving water will displace the oil from the center of the pores (from Clark et al., 1958). Reprinted with permission from the Society of Petroleum Engineers.
</gallery>
Much of the physical processes that control the fluid distribution in a reservoir occurs at the molecular level. Individual molecules show an attraction for each other resulting from weak intermolecular forces. In a body of liquid, the tendency is for the molecules to be pulled in toward the center of the body; surface tension forces will reduce the surface area of the liquid to a minimum. For an interface between two immiscible liquids, the term interfacial tension is used for the force acting to reduce the area of contact between two different fluids.
Much of the physical processes that control the fluid distribution in a reservoir occurs at the molecular level. Individual molecules show an attraction for each other resulting from weak intermolecular forces. In a body of liquid, the tendency is for the molecules to be pulled in toward the center of the body; surface tension forces will reduce the surface area of the liquid to a minimum. For an interface between two immiscible liquids, the term interfacial tension is used for the force acting to reduce the area of contact between two different fluids.