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In this scheme, Overall Prospect Chance is divided into Play Chance and Prospect Specific Chance. The is also a modifier for DHI evidence ("Amplitude prospect)
Play Chance is divided into three categories: Reservoir, Source and seal (or Regional Reservoir, Regional Source and Regional Seal).
Prospect Chance is divided into four categories: Reservoir, Migration, Seal and Trap.
Each category has one, two or more key elements. You are required to assign a chance to each element. This is a "minimum element" scheme; the final category chance is the lowest of all the element chances.
Individual chances are rounded to the nearest 5%.
The overall Prospect Chance is the multiplication of the Play Chance and Prospect Specific Chance:
Overall Prospect Chance = P100 = P(play) x P(prospect specific) + Amplitude modifier
P(play) = P(regional reservoir) x P(regional seal) x P(regional source)
P(prospect specific) = P(reservoir) x P(migration) x P(seal) x P(trap)
Tip: answer the question, the whole question and nothing but the question.