 The structure comprises a series of southwesterly dipping tilted fault blocks.The reservoir sandstones are Middle Jurassic in age and were deposited as a result of deltaic progradation across the Hutton area.The oil bearing Brent Group sandstones vary in thickness from 150 ft to 380 ft with average porosities of 22% and permeabilities of 500-2000 md in the producing zones.