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油水间的界面张力（ＩＦＴ）是造成油藏中大量原油用常规的气驱或水驱方法不能采出的主要原因。当油和驱替液间的ＩＦＴ为 ０时，两相变为混相。最小混相压力（ＭＭＰ）即为ＩＦＴ变为０时的压力，也是注入气和油相互混相时的最小压力。 用于确定ＭＭＰ的常规方法需要好几天。
Interfacial tension (IFT) between oil and water is the main reason that large amount of crude oil in oil reservoir can not be produced by conventional gas drive or waterflooding method. When the IFT between the oil and the displacement fluid is zero, the two phases become miscible. Minimum miscibility pressure (MMP) is the pressure at which IFT becomes zero, and is the minimum pressure at which the injected gas and oil mix with each other. The conventional method for determining MMP takes several days.