There are various different levels of "proven" oil reserves (P1, P2, P3) for crude oil reserves. They can be summarized as follows:
Proved 1P - at least 90% probability
Proved + Probable 2P - at least 50% probability
Proved + Probable +Possible 3P - at least 10 % probability
However, to make things more confusing, some people do not use the definition of geological probability for the existence of an oil reserve, but vague assertions like:
Proved P1 - reasonable certainty
Probable P2 - more likely than not
Possible P3 - less likely than probable
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