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Fluids which may occur in petroleum reservoir, either naturally or as a result of Anthropogenic Invasion:
| Liquid hydrocarbons | Gaseous hydrocarbons | Water | Non-organic fluids |
|---|---|---|---|
| Oil including Solution Gas | Natural Gas | Formation water | |
| Condensate | Injection Gas | Injection water |
All hydrocarbons initially present in Petroleum Reservoir before the anthropogenic invasion are called Hydrocarbon Initial In Place (HCIIP).
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