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Reserves Classification

Created by Rushana Farakhova, last modified by Arthur Aslanyan (Nafta College) on Sep 15, 2019

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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

	High perm	Medium perm	Low perm	Shale
	> 100 md	10 md ÷ 100 md	0.1 md ÷ 10 md	< 0.1 md
Gas
Gas condensate
Light oil
Oil
Heavy oil
Bitumen

where box colors mean:

Conventional Reserves

Unconventional reserves

Reserves 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

See Also

Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petroleum Geology / Petroleum Reservoir / Hydrocarbon Reserves

[ Russian Reserves Categories ]

References

https://www.spe.org/industry/reserves.php

https://www.spe.org/industry/docs/GuidelinesEvaluationReservesResources_2001.pdf

https://www.spe.org/industry/docs/PRMS-Guide-for-Non-Technical-Users-2007.pdf

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