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Expand
titleBy oil density




Light crudeMedium oilHeavy crudeExtra heavy crude
kg/m3< 870870 – 920920 – 1000> 1000
API> 31.1°22.3° – 31.1°10° – 22.3°< 10°





Expand
titleBy 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° 



Gas 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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