Synonym: Hydrocarbon Reservoir = Hydrocarbon Deposit
Petroleum Reservoir or its part with dominating petroleum hydrocarbons saturation.
It's normally classified as a Gas Reservoir or as an Oil Reservoir:
Sometimes the two share the same Petroleum Reservoir with Gas Reservoir overlying Saturated Oil Reservoir.
See Also
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petroleum Geology / Petroleum Reservoir
[ Hydrocarbon Reserves ][ Hydrocarbon Reserves Classification ]