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→Capillary pressure
[[Wettability]] in an oil reservoir controls reservoir quality by affecting the amount of water production. When the reservoir rock is oil-wet, water is located in the central portion of the pores and will flow through the pore system with the oil. Conversely, in a water-wet reservoir, the water is restricted to the perimeter of the pores and will not flow through the pore system until much of the oil has been removed. In addition, the irreducible water saturations of oil-wet reservoirs tend to be much lower than those of water-wet reservoirs.
[[Wettability]] in an oil reservoir controls reservoir quality by affecting the amount of water production. When the reservoir rock is oil-wet, water is located in the central portion of the pores and will flow through the pore system with the oil. Conversely, in a water-wet reservoir, the water is restricted to the perimeter of the pores and will not flow through the pore system until much of the oil has been removed. In addition, the irreducible water saturations of oil-wet reservoirs tend to be much lower than those of water-wet reservoirs.
===[[Capillary pressure]]===
===Capillary pressure===
The [[capillary pressure]] of a reservoir affects the magnitude and distribution of water saturation and thus the hydrocarbon volume in a given reservoir area [[Leverett, 1941]]{{citation needed}}. The capillary pressure is a function of the capillary radius, the interfacial tension, and the contact angle between the water and the solid (see [[Capillary pressure]]). In a reservoir, zones with larger pores and pore throats have lower capillary pressure, lower irreducible water saturation, and higher hydrocarbon pore volume.
The [[capillary pressure]] of a reservoir affects the magnitude and distribution of water saturation and thus the hydrocarbon volume in a given reservoir area [[Leverett, 1941]]{{citation needed}}. The capillary pressure is a function of the capillary radius, the interfacial tension, and the contact angle between the water and the solid (see [[Capillary pressure]]). In a reservoir, zones with larger pores and pore throats have lower capillary pressure, lower irreducible water saturation, and higher hydrocarbon pore volume.