Estimating recoveries or oil in the ground is just a guess of what is probable until you actually get it out of the ground.
P90 = very probable i.e with the set of circumstances they can see, 9 times out of 10....this is the volume recoverable. Many companies class this as their "low" recovery scenario.
P50 = 5/10 probable....usually get a mean or 'mid" case classification.
P10 = high case scenario where more is recoverable than expected.
Regards NC
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