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A large part of the resources on the continental shelf have not been discovered yet. There are several methods for calculating the undiscovered volumes. The NPD employs a method called play analysis.
A play is a geographically and stratigraphically delimited area where a specific set of geological factors such as reservoir rock, trap, mature source rock and migrations paths exist in order that petroleum may be provable.
The NPD's current and updated plays will be available from this website.