Glossary
| Term | Definition |
|---|---|
| Oil | 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. |
| OIP | Oil in place. The volume of oil held in a reservoir in the subsurface . Not all of this oil can be recovered. |
| OWC | Oil-water contact, which marks the base of an oil accumulation. |