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@wikipedia


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


complexityBitumen
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titleBy
ConventionalUnconventional
GasCondensate
OilHeavy OilShale GasShale Oil
recoverable volume
Very SmallSmallMediumBigGiantSuper-Giant
< 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
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titleBy reserves uncertainty (SPE)

Excerpt Include
Hydrocarbon Reserves Uncertainty
Hydrocarbon Reserves Uncertainty
nopaneltrue

oil
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titleBy
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
API> 70°45° ÷ 70°45° ÷
>
31.1°22.3
-
° ÷ 31.1°10
-
° ÷ 22.3°4° ÷ 10°


* – with reference to air.

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titleBy petroleum mobility

Dynamic fluid viscosity

Extra high perm

High perm

Medium perm

Low perm

Tight (Shale)


cP> 1000 md100 md  ÷ 1000 md10 md  ÷ 100 md0.1 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.

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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 
Reservoir 

Wet Gas Reservoir

Dry Gas Reservoir


both underlying Natural Gas Reservoir 
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titleBy sulfur content
Sweet crudeSour crude
Sulfur  < 0.5%Sulfur  > 0.5%
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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
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titleBy rock quality (FZI)
Very PoorPoorMediumGoodVery Good

< 0.45

0.45 ÷ 1.0

1.0 ÷ 3.5

3.5 ÷ 8.0

> 8.0

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titleBy aquifer type and strength

Strong AquiferPoor AquiferNo Aquifer
Edge Aquifer


Bottom Aquifer


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titleBy rock type
SedimentaryIgneousMetamorphic
Clastic RockCarbonate Rock

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titleBy reservoir homogeneity
MatrixFissuredFractured
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titleBy vertical homogeneity
UniformDissected
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titleBy fault developemnt
Faulted 
Faulted
Compartmentalized
Image Removed
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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

FlatDomeStructural Trap
Image Removed

Image Removed



See Also

...

Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petroleum Geology

...

grouparax

 / Petroleum Reservoir / Hydrocarbon Reserves

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


References

...

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

https://www.spe.org/industry/docs/GuidelinesEvaluationReservesResources_2001.pdf

https://www.spe.org/industry/docs/PRMS-Guide-for-Non-Technical-Users-2007.pdf

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bgColorpapayawhip
titleARAX

[ Russian Reserves Categories [in russian] ]

...


Show If
grouparax
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bgColorpapayawhip
titleARAX

[1] Dr. Jon Olson, Dr. Mukul Sharma, Dr. Zoya Heidari, Shale Fracturing: The Geology And Technology That Sustained The Boom