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titleBy reserves uncertainty (SPE)


2P = Proven P90 + Possible P50
1P = Proven P90Probable P50Possible P10
Proven developed (PD)Proven Undeveloped (PUD)


see also Russian Reserves  Uncertainty Categories



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titleBy recovery cost
ConventionalUnconventional
GasCondensate
OilHeavy OilShale GasShale OilBitumen
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titleBy petroleum density




GasCondensateLight crudeMedium crudeHeavy crudeExtra heavy crude
kg/m3

< 870870 – 920920 – 1000> 1000
API

> 31.1°22.3° – 31.1°10° – 22.3°< 10°




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titleBy petroleum mobility



Specific GravityAPI Gravity

High perm

Medium perm

Low perm

Tight (Shale)


fracAPI> 100 md10 md  ÷ 100 md0.1 md ÷ 10 md< 0.1 md
Gas< 0.7> 70° 



Condensate0.7 ÷ 0.87> 45° 



Light Oil< 0.87> 31.1°



Medium Oil0.87 ÷ 0.9222.3° ÷ 31.1°



Heavy Oil0.92 ÷ 1.010° ÷ 22.3°



Extra Heavy Oil (Bitumen)> 1.04° ÷ 10°




where box colors mean:

Conventional ReservesUnconventional Reserves Unrecoverable Reserves

and the ranges of properties in the table are only tentatively define the category based on the industry statistics and conventions, which vary over history and locations.


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titleBy aquifer type


No AquiferEdge AquiferBottom Aquifer




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titleBy reservoir homogeneity


MatrixFissuredFracturedFaultedCompartmentalized



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