United Kingdom Oil and Gas Fields: 50th Anniversary Commemorative Volume
Geological Society Memoir 52 records the extraordinary journey of more than 50 years that has led to the development of some 458 oil and gas fields on the UK Continental Shelf (UKCS). It contains papers on almost 150 onshore and offshore fields in all of the UK's main petroliferous basins. These papers range from look-backs on some of the first-developed gas fields in the Southern North Sea, to papers on fields that have only just been brought into production or may still remain undeveloped, and includes two candidate CO2 sequestration projects.
These papers are intended to provide a consistent summary of the exploration, appraisal, development and production history of each field, leading to the current subsurface understanding which is described in greater detail. As such, the Memoir will be an enduring reference source for those exploring for, developing, producing hydrocarbons and sequestering CO2 on the UKCS in the coming decades. It encapsulates the petroleum industry's deep subsurface knowledge accrued over more than 50 years of exploration and production.
The Cygnus Field, Blocks 44/11a and 44/12a, UK North Sea
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Published:October 30, 2020
Abstract
The Cygnus Field is located in Blocks 44/11a and 44/12a of the UK Southern North Sea. The field was first discovered in 1988 as a tight lower Leman Sandstone Formation gas discovery by well 44/12- 1. After the licences had sat idle for several years, GDF Britain (now Neptune E&P UK Ltd) appraised the field from 2006 to 2010. During the appraisal phase, the lower Leman Sandstone was found to be of better quality than first discovered and the gas-bearing lower Ketch Member reservoir was also encountered. The field development was sanctioned in 2012.
The field has been developed from two wellhead platforms targeting Leman Sandstone and Ketch Member reservoirs. Five main fault blocks have been developed, with two wells in each fault block planned in the field development plan. The wells are long horizontal wells completed with stand-alone sand screens. At the time of writing, the production plateau is 320 MMscfgd (266 MMscfgd when third-party constraints apply), producing from nine wells with the final production well to be drilled.
- Atlantic Ocean
- block structures
- Caledonian Orogeny
- data integration
- drilling
- enhanced recovery
- Europe
- exploitation
- faults
- history
- Leman Sandstone Formation
- Lower Permian
- marine installations
- marine platforms
- natural gas
- North Atlantic
- North Sea
- offshore
- oil wells
- Paleozoic
- Permian
- petroleum
- platforms
- production
- reserves
- reservoir properties
- reservoir rocks
- systems
- tight sands
- United Kingdom
- Western Europe
- Ketch Member
- Cygnus Field