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Term Definition

Liquid hydrocarbons, generally more viscous and darker in color than condensates.

oil field

A subsurface accumulation of hydrocarbons.

oil window

The depth interval in which source rock can actively generate mobile oil.


Oil in place. The volume of oil held in a reservoir in the subsurface . Not all of this oil can be recovered.


Oil-water contact, which marks the base of an oil accumulation.

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