Figure 4. Schematic graph illustrating petroleum volumes and probabilities. Curves represent categories of oil assessment. How one reads this graph is illustrated by the blue and orange lines projected to the curve for economically recoverable oil—in this example, there is a 95% chance (probability F95 ) of at least volume V1 of economically recoverable oil, and there is a 5% chance (probability F05) of at least volume V2 of economically recoverable oil.
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