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。