The range of total estimated prospective recoverable oil volumes for Zion’s prospect in the four target horizons ranges from 20.7 million barrels to 234.6 million barrels of oil. The “best estimate” (P50 case) for recoverable oil in the Mid Cretaceous is 27.8 million barrels, Upper Jurassic is 18.3 million barrels, Mid Jurassic is 17.9 million barrels and Triassic is 5.7 million barrels for a total “best estimate” for recoverable hydrocarbons at 69.7 million barrels, if a discovery is made.