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Petroleum geology of the Cygnus gas field, UK North Sea: from discovery to development

Ross Catto, Samantha Taggart and Gareth Poole
Geological Society, London, Petroleum Geology Conference series, 8, 307-318, 23 March 2017, https://doi.org/10.1144/PGC8.39
Ross Catto
ENGIE E&P UK Limited, 40 Holborn Viaduct, London EC1N 2PB, UK
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  • For correspondence: ross.catto@gmail.com
Samantha Taggart
ENGIE E&P UK Limited, 40 Holborn Viaduct, London EC1N 2PB, UK
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Gareth Poole
ENGIE E&P UK Limited, 40 Holborn Viaduct, London EC1N 2PB, UK
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Abstract

The Cygnus Field, operated by ENGIE E&P UK Limited, is located in UK Southern North Sea blocks 44/11 and 44/12. The reservoir comprises sandstones of the Permian Leman Sandstone Formation and Carboniferous Ketch Formation.

Cygnus was first drilled in 1988 by well 44/12-1, which encountered gas shows in sandstones in the Leman Sandstone Formation whilst targeting a Carboniferous objective. The initial evaluation indicated the presence of poor-quality reservoir with conventional log analysis indicating high water saturations. Further appraisal activity ceased until 2002 when a group led by ENGIE E&P UK Limited were awarded the licence in the 20th round having recognized the missed pay potential. Through appraisal drilling, a second reservoir (the Carboniferous Ketch Formation) was discovered and the Leman Sandstone Formation was proven to be capable of achieving stabilized flow rates greater than 30 MMscf/d.

The Cygnus discovery now proves that a northern-sourced Leman Sandstone Formation play fairway exists, establishing an extension of the Rotliegend play to the northern feather edge of the Southern Permian Basin. The Cygnus Field's estimated ultimate recoverable volume is forecast to be 760 Bscf, making it the largest field discovered in the UK Southern North Sea in the last 30 years.

  • © ENGIE E&P UK Limited 2018. Published by the Geological Society, London. All rights reserved
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Geological Society, London, Petroleum Geology Conference 				series: 8 (1)
Geological Society, London, Petroleum Geology Conference series
Volume 8
2018
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Petroleum geology of the Cygnus gas field, UK North Sea: from discovery to development

Ross Catto, Samantha Taggart and Gareth Poole
Geological Society, London, Petroleum Geology Conference series, 8, 307-318, 23 March 2017, https://doi.org/10.1144/PGC8.39
Ross Catto
ENGIE E&P UK Limited, 40 Holborn Viaduct, London EC1N 2PB, UK
  • Find this author on Google Scholar
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  • For correspondence: ross.catto@gmail.com
Samantha Taggart
ENGIE E&P UK Limited, 40 Holborn Viaduct, London EC1N 2PB, UK
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  • Find this author on PubMed
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Gareth Poole
ENGIE E&P UK Limited, 40 Holborn Viaduct, London EC1N 2PB, UK
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Petroleum geology of the Cygnus gas field, UK North Sea: from discovery to development

Ross Catto, Samantha Taggart and Gareth Poole
Geological Society, London, Petroleum Geology Conference series, 8, 307-318, 23 March 2017, https://doi.org/10.1144/PGC8.39
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  • Article
    • Abstract
    • Exploration and appraisal history
    • Development plan
    • Structural evolution
    • Stratigraphy and reservoir sedimentology
    • Seismic mapping of the Base Permian Unconformity and related reservoir distribution
    • Reservoir quality
    • Reservoir exploitation strategy
    • Concluding remarks
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