GLOSSARY

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Expand
titleBy recoverable volume


Super-GiantGiantBigMediumSmall
> 5 billion bbl> 500 million bbl> 50 million bbl> 5 million bbl< 5 million bbl



Expand
titleBy reserves uncertainty (SPE)


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




Expand
titleBy complexityrecovery cost


ConventionalUnconventional
GasCondensate
OilHeavy OilShale GasShale OilBitumen




Expand
titleBy oil 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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Expand
titleBy sulfur content



Sweet crudeSour crude oil
Sulfur  < 0.5%Sulfur  > 0.5%





Expand
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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