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@wikipedia


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


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titleBy recoverable volume


Super-GiantGiantBigMediumSmall
> 5 billion bbl> 500 million bbl> 50 million bbl> 5 million bbl< 5 million bbl




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titleBy reserves uncertainty (SPE)


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


see also Russian Hydrocarbon Reserves Uncertainty Categories



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Expand
titleBy petroleum density




GasCondensateLight oilMedium OilHeavy OilExtra Heavy Oil (Bitumen)
kg/m3

< 870870 ÷ 920920 ÷ 1000> 1000
API
45° ÷ 70°45° ÷ 31.1°22.3° ÷ 31.1°10° ÷ 22.3°4° ÷ 10°




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Expand
titleBy petroleum mobility



Specific Gravity *API Gravity

High perm

Medium perm

Low perm

Tight (Shale)


fracAPI> 100 md10 md  ÷ 100 md0.1 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°



* – with reference to air.

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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titleBy sulfur content



Sweet crudeSour crude oil
Sulfur  < 0.5%Sulfur  > 0.5%





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Expand
titleBy gas saturation


Undersaturated oil reservoirSaturated oil reservoir




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Expand
titleBy aquifer type and strength



No AquiferPoor AquiferStrong Aquifer
Edge Aquifer


Bottom Aquifer





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titleBy reservoir homogeneity


MatrixFissuredFracturedFaultedCompartmentalized





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Expand
titleBy trap structure


AnticlineStratigraphicNormal FaultThrust Fault

Excerpt Include
Anticline Structure
Anticline Structure
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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 ]


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