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
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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.
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Memoir 20 is the most comprehensive reference work on the UK’s oil and gas fields available. It updates and substantially extends Memoir 14 (1991), United Kingdom 0il and Gas Fields, one of the Geological Society’s best-selling books. This new edition contains updates on many of the ageing giant fields, as well as entries for fields either undiscovered or undeveloped when Memoir 14 was published.
The book is divided into nine parts covering the major petroleum provinces both offshore and onshore United Kingdom, from the Gas Basin in the southern North Sea to the Viking Graben in the northern North Sea, from the Atlantic Frontier to the Irish Sea and from the Wessex Basin to the East Midlands. Each part contains a reference map showing field locations. The introductory chapters reveal the stories behind the major plays and discoveries therein, and their tectonic and stratigraphic framework. There are two appendices: tabulated field data and a comprehensive list for all of the UK's 300+ oil and gas fields.