简答题 翻译：The retort method has several disadvantages as far as commercial work is concerned.

问答题翻译：Conditions of viscous flow mean that the rate of flow will be sufficiently low to be directly proportinal to the potential gradient.

问答题翻译：The data for subsurface maps are obtained from a number of sources.

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。