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titleBy petroleum mobility

Dynamic fluid viscosity

High perm

Medium perm

Low perm

Tight (Shale)


cP> 100 md10 md  ÷ 100 md0.1 md ÷ 10 md< 0.1 md
Light OilLow viscous oil< 1



Medium Oilviscous oil

1 ÷ 10





Heavy OilHigh viscous oil10 ÷ 100



Extra Heavy Oilhigh viscous oil100 ÷ 10,000



Bitumen> 10,000




where box 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 water-oil -water relative mobility ratio
Water extra mobileWater more mobileSame mobilityOil more mobileOil extra mobile
>55 ÷ 1.50.5 ÷ 1.50.2 ÷ 0.5<0.2

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