Britannia Satellites Phase One—Combining Mature, Stratigraphically Distinct Discoveries Through a Multi Field Development, Outer Moray Firth, United Kingdom Continental Shelf
Paul McQuillan, Kim Watson, ConocoPhillips (
The Britannia Satellites Phase 1 Development involves the development of two relatively small fields in the Outer Moray Firth of the UKCS. The two fields are known as Callanish, an oil field with a gas cap, and Brodgar a Gas Condensate Field, The Fields are located within a 40 km radius of the Britannia Platform, through which the hydrocarbons will be exported. Due to the complex technical issues around their definition, their size and the commercial situation it was only in December 2003 that a Field development plan gained sanction. This paper will focus primarily on the resolution of the technical GG&RE issues that finally allowed the project to go forward.
The Callanish Field comprises two mappable accumulations: a main field area, discovered by the 15/29b-12 Finder well in 1999, and an untested Outlier separated from the main accumulation by a structural saddle. The main field area was appraised in 2000 by the 15/29b-13 well. The reservoir is a complex Forties Sandstone channel system of late Palaeocene age.
The Brodgar Field is a gas-condensate accumulation. The Field was discovered by the 21/3a- 4 well in 1985 and subsequently appraised in 2000 by the 21/3a- 7 well. The Brodgar accumulation is a northwest-southeast trending compressional ridge in the South Buchan Graben. The reservoir is the Lower Cretaceous Kopervik Sandstone which has 3 way dip closure bounded on the northeast by a stratigraphic seal against the footwall of the Rattray volcanic high.