Changes

==Two phases are better than one==

==Two phases are better than one==

Seal capacity depends on both the hydrocarbon phase and the physical character of the top seal. Since displacement pressure is a function of the seal and the coefficient of interfacial tension of the hydrocarbon phase beneath the seal, it is possible to trap a thicker two-phase hydrocarbon column than oil alone or gas alone.<ref name=ch10r92>Watts, N., L., 1987, Theoretical aspects of cap-rock and fault seals for single and two-phase hydrocarbon columns: Marine and Petroleum Geology, vol. 4, no. 4, p. 274–307., 10., 1016/0264-8172(87)90008-0</ref> The gas in contact with the base of the seal determines the displacement pressure (P_d) of the seal. The buoyant effect of the oil column, however, is less than that of a pure gas column, and a greater total hydrocarbon column can be trapped.

[[Seal capacity]] depends on both the hydrocarbon phase and the physical character of the top seal. Since [[Top seal displacement pressure|displacement pressure]] is a function of the seal and the [[coefficient of interfacial tension]] of the [[hydrocarbon phase]] beneath the seal, it is possible to trap a thicker two-phase hydrocarbon column than oil alone or gas alone.<ref name=ch10r92>Watts, N., L., 1987, Theoretical aspects of cap-rock and fault seals for single and two-phase hydrocarbon columns: Marine and Petroleum Geology, vol. 4, no. 4, p. 274–307., 10., 1016/0264-8172(87)90008-0</ref> The gas in contact with the base of the seal determines the displacement pressure (P_d) of the seal. The [[Buoyancy forces in reservoir fluids|buoyant effect]] of the oil column, however, is less than that of a pure gas column, and a greater total [[hydrocarbon column]] can be trapped.

==Single phase vs. two phase==

==Single phase vs. two phase==