The Britannia Field, Blocks 15/29a, 15/30, 16/26, 16/27a, 16/27b, UK North Sea
P. J. Hill, A. J. Palfrey, 2003. "The Britannia Field, Blocks 15/29a, 15/30, 16/26, 16/27a, 16/27b, UK North Sea", United Kingdom Oil and Gas Fields Commemorative Millennium Volume, J. G. Gluyas, H. M. Hichens
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The Britannia Field is located 140 miles NE of Aberdeen at the southeast end of the Witch Ground Graben, on the southern flank of the Fladen Ground Spur. Gas and condensate are trapped in Lower Cretaceous (Aptian) deepwater, marine sandstones in a combined stratigraphic/structural trap that straddles four UKCS blocks. Reservoir quality varies from west to east across the field. The principal reservoirs in the west (Blocks 15/29a, 15/30) are in clean, blocky, high-density turbidite sands. The principal reservoirs in the east (Blocks 16/26, 16/27a, 16/27b) are in fine-grained sandstones and unusual slurried facies that have a high mud content and show gravity-driven structuring. The bulk of the field’s reserves lies in the east and is produced via a 36-slot platform. A 14-slot sub-sea template tied back to the platform via a nine-mile flowline bundle produces the western area. Reserves are being developed by pressure depletion and are estimated at 3 TCF gas together with 131 MMBOE condensate and natural gas liquids. Britannia came on-stream in August 1998 and is expected to have a field life in the order of 30 years.