问答题 翻译：Finally, it should be noted that the effective compressibility of an oil-gas mixture below its bubble point pressure is large, since much of the volume decrease with pressure increase is associated with the change in phase of some the gas to a liquid.

问答题 翻译：The gas formation volume factor Bg is the volume measured at reservoir conditions that corresponds to a unit volume of gas at standard conditions. Thus, Bg<1.

问答题 翻译：These reservoirs contains oil at the bubble-point pressure at the gas-oil contact atdiscovery but are increasing toward the aquifer.