The Birch Field, Block 16/12a, UK North Sea
J. Hook, A. Abhvani, J. G. Gluyas, M. Lawlor, 2003. "The Birch Field, Block 16/12a, UK North Sea", United Kingdom Oil and Gas Fields Commemorative Millennium Volume, J. G. Gluyas, H. M. Hichens
Download citation file:
The Birch Field is an oil field located in Block 16/12a on the UK Continental Shelf (UKCS) and is part of the well- established ‘Brae Trend’. Birch produces an undersaturated volatile oil from the Brae Conglomerate, a locally thick conglomeratic unit within the Late Jurassic Brae Formation. The reservoir was deposited as a small submarine fan in the hanging wall of the main fault bounding the western side of the South Viking Graben. The current estimate for oil in place is about 70MMSTB with expected ultimate oil reserves of 30MMSTB. The field was brought on stream in September 1995 as a phased waterflood subsea development, tied back to Marathon’s Brae ‘A’ platform in neighbouring Block 16/7a. During Phase I the discovery and both appraisal wells were re-completed as two oil producers and one water injection well. Phase II comprised a third oil production well and a second water injection well drilled and completed in 1996-1997. Oil production peaked at c. 28 000 BOPD in the second half of 1996. The field is currently in decline and production in June 1999 was c. 7000 BOPD with a water-cut of c. 40%. Cumulative oil production to end June 1999 was 21 MMSTB and remaining oil reserves are estimated as 9 MMSTB.