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@wikipedia

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titleBy recoverable volume


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





Expand
titleBy reserves uncertainty (SPE)


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


see also Russian Reserves  Uncertainty Categories

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