By recoverable volume

Super-Giant	Giant	Big	Medium	Small
> 5 billion bbl	> 500 million bbl	> 50 million bbl	> 5 million bbl	< 5 million bbl

By uncertainty (SPE)

2P = Proven P90 + Possible P50
1P = Proven P90		Probable P50	Possible P10
Proven developed (PD)	Proven Undeveloped (PUD)

By complexity

Conventional				Unconventional
Gas	Condensate	Oil	Heavy Oil	Shale Gas	Shale Oil	Bitumen

By oil density

	Light crude	Medium oil	Heavy crude	Extra heavy crude
kg/m³	< 870	870 - 920	920 - 1000	> 1000
°API	> 31.1	22.3 - 31.1	10 - 22.3	< 10

By mobility

Red crosses x indicate reservoir-fluid combinations which are currently not exploited by Petroleum Industry.

By reservoir homogeneity

Matrix

Fissured

Fractured

Faulted

Compartmentalized

By trap structure

Anticline	Stratigraphic	Normal Fault	Thrust Fault

References

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