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titleBy 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 tonne ton1 ÷ 10 mln tonne ton10 ÷ 30 mln tonne ton30 ÷ 100 mln tonne ton100 ÷ 300 mln tonne ton> 300 mln tonne ton
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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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