GLOSSARY

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titleBy petroleum density at surface




GasCondensateLight oilMedium OilHeavy OilExtra Heavy Oil (Bitumen)
kg/m3

< 870870 ÷ 920920 ÷ 1000> 1000
API
45° ÷ 70°45° ÷ 31.1°22.3° ÷ 31.1°10° ÷ 22.3°4° ÷ 10°



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titleBy petroleum mobility



Specific Gravity *API Gravity

High perm

Medium perm

Low perm

Tight (Shale)


fracAPI> 100 md10 md  ÷ 100 md0.1 md ÷ 10 md< 0.1 md
Gas< 0.5 *> 70° 



Condensate0.69 ÷ 0.81645° ÷ 70°



Light Oil

0.816 ÷ 0.87

31.1° ÷ 45°



Medium Oil0.87 ÷ 0.9320.7° ÷ 31.1°



Heavy Oil0.93 ÷ 1.010° ÷ 20.7°



Extra Heavy Oil (Bitumen)1.0 ÷ 1.044° ÷ 10°



* – with reference to air.

where box colors colours 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 sulfur content



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





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titleBy reservoir gas saturationconditions


Undersaturated oil reservoirSaturated oil reservoirGas Condensate  reservoirRetrograde Gas Condensate Reservoir Gas reservoir




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titleBy aquifer type and strength



No AquiferPoor AquiferStrong Aquifer
Edge Aquifer


Bottom Aquifer




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