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@wikipedia


Hydrocarbon Reserves Classification provides the primary insight into the size, uncertainty and structure of the Hydrocarbon Reserves.


Giant
Panel
Expand
titleBy recoverable volume
Very SmallSmallMedium
Super-Giant
Big
Medium
Giant
Small> 5 billion
Super-Giant
< 7 mln bbl
> 500 million
7 ÷ 70 mln bbl
> 50 million
70 ÷ 200 mln bbl
> 5 million
200 ÷ 700 mln bbl
< 5 million
700 ÷ 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
Panel
Expand
titleBy uncertainty (SPE)
2P = Proven P90 + Possible P50
1P = Proven P90Probable P50Possible P10
Proven developed (PD)Proven Undeveloped (PUD)
Expand
titleBy
complexity
reserves uncertainty (SPE)

Excerpt Include
Hydrocarbon Reserves Uncertainty
Hydrocarbon Reserves Uncertainty
nopaneltrue

Panel
ConventionalUnconventional
GasCondensate
OilHeavy OilShale GasShale OilBitumen
Expand
titleBy
oil
petroleum density at surface




GasCondensateLight
crude
oilMedium
oil
OilHeavy
crude
OilExtra
heavy crude
Heavy Oil (Bitumen)
kg/m3< 702*702 ÷ 801801 ÷ 870
870 –
870 ÷ 920
920 –
920 ÷ 1000> 1000
API
> 70°45° ÷ 70°45° ÷
>
31.1°22.3°
–
 ÷ 31.1°10°
–
 ÷ 22.3°
< 10
4° ÷ 10°


* – with reference to air.

API Gravity
Panel
Expand
titleBy petroleum mobility
Specific Gravity

Dynamic fluid viscosity

Extra high perm

High perm

Medium perm

Low perm

Tight (Shale)

frac> 100 

cP
API
> 1000 md100 md  ÷ 1000
md10 md  ÷ 100 md0.1
md ÷ 10 
md ÷ 10 md< 0.1 md
Low viscous oil< 1




Medium viscous oil

1 ÷ 10






High viscous oil10 ÷ 100




Extra high 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.

where box colors mean:
Reserves which are currently not exploited by Petroleum Industry
Panel
Expand
titleBy reservoir gas conditions
Undersaturated Oil ReservoirSaturated Oil ReservoirNatural Gas Reservoir 

Black Oil Reservoir

Volatile Oil 
Reservoir

Gas Cap Oil
Reservoir

Oil Rim
Reservoir

Retrograde Gas Condensate

> 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°Conventional ReservesUnconventional reserves 

 
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

Compartmentalized
Panel
Expand
titleBy reservoir homogeneity
MatrixFissuredFractured
Faulted
Panel
Expand
titleBy vertical homogeneity
UniformDissected
Panel
Expand
titleBy fault developemnt
Faulted Compartmentalized
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



See Also

...

Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petroleum Geology / Petroleum Reservoir / Hydrocarbon Reserves

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


References

...

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

...