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Panel
Expand
titleBy recoverable volume
Very SmallSmallMediumBigGiantSuper-Giant
GiantBigMediumSmall> 5 billion bbl> 500 million bbl> 50 million bbl> 5 million bbl
< 7 mln bbl7 ÷ 70 mln bbl70 ÷ 200 mln bbl200 ÷ 700 mln bbl700 ÷ 2,000 mln bbl> 2,000 mln bbl
< 1 mln ton1 ÷ 10 mln ton10 ÷ 30 mln ton30 ÷ 100 mln ton100 ÷ 300 mln ton> 300 mln ton
< 5 million bbl
Panel
see also Russian Hydrocarbon Reserves Uncertainty Categories

Expand
titleBy reserves uncertainty (SPE)

Excerpt Include
Hydrocarbon Reserves Uncertainty
Hydrocarbon Reserves Uncertainty
nopaneltrue

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

Panel
Expand
titleBy petroleum density at surface




GasCondensateLight oilMedium OilHeavy OilExtra Heavy Oil (Bitumen)
kg/m3< 702*702 ÷ 801801 ÷ 870870 ÷ 920920 ÷ 1000> 1000
API> 70°45° ÷ 70°45° ÷ 31.1°22.3° ÷ 31.1°10° ÷ 22.3°4° ÷ 10°


* – with reference to air.

> 100 
Panel
API Gravity
Expand
titleBy petroleum mobility

Dynamic fluid viscosity

Extra high perm

Specific Gravity *

High perm

Medium perm

Low perm

Tight (Shale)

frac

cP
API
> 1000 md100 md  ÷ 1000 md10 md  ÷ 100 md0.1
md ÷ 10 
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°
Low viscous oil< 1




Medium viscous oil

1 ÷ 10






High viscous oil10 ÷ 100




Extra high viscous oil100 ÷ 10,000




Bitumen> 10,000





* – with reference to air.
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.

PanelSulfur  > 0

.

5%

Expand
titleBy sulfur content
Sweet crudeSour crude
Sulfur  < 0.5%
Panel
Expand
titleBy reservoir gas conditions
Reservoir 
Undersaturated Oil ReservoirSaturated Oil ReservoirNatural Gas Reservoir 

Black Oil
Reservoir

Volatile OilOil 
Reservoir

Gas Cap Oil
Reservoir

Oil Rim
Reservoir

Retrograde Gas Condensate 
Reservoir 

Wet Gas Reservoir

Dry Gas Reservoir


both underlying Natural Gas Reservoir 
Panel
Expand
titleBy sulfur content
Sweet crudeSour crude
Sulfur  < 0.5%Sulfur  > 0.5%
Panel
Expand
titleBy water-oil relative mobility ratio
Very Fast OilFast OilCommensurable mobilitie of Oil and WaterFast WaterVery Fast Water
<0.20.2 ÷ 0.750.75 ÷ 1.251.25 ÷ 5>5
Panel
Expand
titleBy rock quality (FZI)
Very PoorPoorMediumGoodVery Good

< 0.45

0.45 ÷ 1.0

1.0 ÷ 3.5

3.5 ÷ 8.0

> 8.0

Panel
Expand
titleBy aquifer type and strength

Strong AquiferPoor AquiferNo Aquifer
Edge Aquifer


Bottom Aquifer


Panel
Expand
titleBy rock type
SedimentaryIgneousMetamorphic
Clastic RockCarbonate Rock

Panel
Expand
titleBy reservoir homogeneity
MatrixFissuredFractured
FaultedCompartmentalized
Panel
Expand
titleBy rock typevertical homogeneity
UniformDissected
Panel
Carbonate Rock
Expand
titleBy fault developemnt
Faulted Compartmentalized
SedimentaryIgneousMetamorphic
Clastic Rock
Panel
Expand
titleBy trap structure
AnticlineStratigraphicNormal FaultThrust Fault

Excerpt Include
Anticline Structure
Anticline Structure
nopaneltrue

Excerpt Include
Stratigraphic Structure
Stratigraphic Structure
nopaneltrue

Excerpt Include
Normal Fault Structure
Normal Fault Structure
nopaneltrue

Excerpt Include
Thrust Fault Structure
Thrust Fault Structure
nopaneltrue

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[ Russian Hydrocarbon Reserves Uncertainty Categories ][ Hydrocarbon Reserves Uncertainty ]


References

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https://www.spe.org/industry/reserves.php

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