问答题 翻译：It has been suggested that an effective oil source rock generates 10-40 bbl of oil per acre ft (0.0013-0.0052cc/cc) for each one per cent of organic carbon. This is approximately 500-2000 ppm by weight。

问答题 翻译：Gas and oil, either as separate fluids or in mixtures, change their state or phase as reservoir pressure changes。

问答题 翻译：The problem consists of being able to predict the variation of pressure with elevation along the length of the flow string for known conditions of flow。