@wikipedia
| 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) |
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| Light crude | Medium oil | Heavy crude | Extra heavy crude |
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| kg/m3 | < 870 | 870 – 920 | 920 – 1000 | > 1000 |
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| API | > 31.1° | 22.3° – 31.1° | 10° – 22.3° | < 10° |
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| Specific Gravity | API Gravity | High perm | Medium perm | Low perm | Tight (Shale) |
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| frac | API | > 100 md | 10 md ÷ 100 md | 0.1 md ÷ 10 md | < 0.1 md |
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| Gas |
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| Gas Condensate |
| > 45° |
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| Light Oil | < 0.87 | > 31.1° |
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| Medium Oil | 0.87 ÷ 0.92 | 22.3° ÷ 31.1° |
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| Heavy Oil | 0.92 ÷ 1.0 | 10° ÷ 22.3° |
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| Extra Heavy Oil (Bitumen) | > 1.0 | 4° ÷ 10° |
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where box colors mean:
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| Matrix | Fissured | Fractured | Faulted | Compartmentalized |
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See Also
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petroleum Geology / Petroleum Reservoir / Hydrocarbon Reserves
[ Russian Reserves 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