@wikipedia
There are different ways of classifying reserves and their structure, below are the most popular categoriesHydrocarbon Reserves Classification provides the primary insight into the size, uncertainty and structure of the Hydrocarbon Reserves.
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title | By recoverable volume |
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title | By reserves uncertainty (SPE) |
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| | 2P = Proven P90 + Possible P50 |
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1P = Proven P90 | Probable P50 | Possible P10 |
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Proven developed (PD) | Proven Undeveloped (PUD) | see also Russian Reserves Uncertainty Categories
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| Conventional | Unconventional |
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Gas | Condensate
| Oil | Heavy Oil | Shale Gas | Shale Oil | Bitumen | reserves uncertainty (SPE) |
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| Hydrocarbon Reserves Uncertainty |
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| Hydrocarbon Reserves Uncertainty |
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title | By petroleum density at surface |
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crude crude crude heavy crude870 – 920 – > – – < 10° | |
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Sweet crude | Sour crude oil |
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Sulfur < 0.5% | Sulfur > 0.5% |
* – with reference to air. |
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title | By petroleum mobility |
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| Specific Gravity | API Gravity | High perm | Medium perm | Low perm | Tight (Shale) |
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fracAPI | > 100 md ÷ 10 Gas | < 0.7 | > 70° | Condensate | 0.7 ÷ 0.87 | > 45° | Light Oil | < 0.87 | > 31.1° | Medium Oil | 0.87 ÷ 0.92 | 22.3° ÷ 31.1° | Heavy Oil | 0.92 ÷ 1.0 | 10° ÷ 22.3° | Extra Heavy Oil (Bitumen) | > 1.0 | 4° ÷ 10° | Low viscous oil | < 1 |
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Medium viscous oil | 1 ÷ 10 |
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High viscous oil | 10 ÷ 100 |
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Extra high viscous oil | 100 ÷ 10,000 |
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Bitumen | > 10,000 |
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where box colours where box colors mean:
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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title | By reservoir gas conditions |
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title | By water-oil relative mobility ratio |
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| Very Fast Oil | Fast Oil | Commensurable mobilitie of Oil and Water | Fast Water | Very Fast Water |
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<0.2 | 0.2 ÷ 0.75 | 0.75 ÷ 1.25 | 1.25 ÷ 5 | >5 |
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title | By rock quality (FZI) |
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| Very Poor | Poor | Medium | Good | Very Good |
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title | By aquifer type and strength |
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title | By reservoir homogeneity |
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title | By vertical homogeneity |
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title | By fault developemnt |
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| Anticline | Stratigraphic | Normal Fault | Thrust Fault |
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| Anticline Structure |
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| Stratigraphic Structure |
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| Normal Fault Structure |
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| Normal Fault Structure |
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| Thrust Fault Structure |
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See Also
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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petroleum Geology / Petroleum Reservoir / Hydrocarbon Reserves
[ Russian Reserves Hydrocarbon Reserves Uncertainty Categories ][ Hydrocarbon Reserves Uncertainty ]
References
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https://www.spe.org/industry/reserves.php
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