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The Acorn and Beechnut Fields, Blocks 29/8a(S), 29/8b, 29/9a(S) and 29/9b, UK North Sea

Hagen, F.; Gluyas, J.G.; Goffey, G.

The Acorn and Beechnut Fields, Blocks 29/8a(S), 29/8b, 29/9a(S) and 29/9b, UK North Sea Thumbnail


Authors

F. Hagen

G. Goffey



Abstract

Unocal discovered the Acorn South Field with wells 29/8b-2 and 29/8b-2s in 1983. The well and its side-track found a small accumulation of oil in Upper Jurassic, Fulmar Formation sandstones in an inter-pod setting. Well 29/8b-3 drilled two years later on what was thought to be the same structure found Acorn North, a larger accumulation of oil in a Triassic Skagerrak Formation reservoir on the crest of a Triassic pod. Premier discovered the Beechnut Field two years later, well 29/9b-2 finding oil in the Fulmar and Skagerrak formations in a faulted, inter-pod setting. Both Acorn and Beechnut are deep, high-pressure and high-temperature fields with complex reservoir stratigraphy due to halokinesis during sedimentation and post-depositional structuration. The Skagerrak Formation reservoir in Acorn North is appreciably poorer than similar-age reservoirs further north whilst the Fulmar Formation in Beechnut is relatively poorly developed. Acorn's mid-case oil in place is 90 MMbbl in the Skagerrak Formation and 13 MMbbl in the Fulmar Formation and, for Beechnut, is 15 MMbbl in the Fulmar Formation. Neither field has been developed. Limiting factors include the resource size, variable reservoir development (Beechnut), modest reservoir quality (Acorn North), compartmentalization concerns and development costs.

Citation

Hagen, F., Gluyas, J., & Goffey, G. (2020). The Acorn and Beechnut Fields, Blocks 29/8a(S), 29/8b, 29/9a(S) and 29/9b, UK North Sea. Memoirs, 52, 349-359. https://doi.org/10.1144/m52-2018-31

Journal Article Type Article
Acceptance Date Nov 16, 2018
Online Publication Date Oct 30, 2020
Publication Date 2020
Deposit Date Nov 21, 2018
Publicly Available Date Mar 29, 2024
Journal Memoirs
Print ISSN 0435-4052
Electronic ISSN 2041-4722
Publisher The Geological Society
Peer Reviewed Peer Reviewed
Volume 52
Pages 349-359
DOI https://doi.org/10.1144/m52-2018-31

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Copyright Statement
Hagen, F. Gluyas,J.G. & Goffey, G. (2020). The Acorn and Beechnut Fields, Blocks 29/8a(S), 29/8b, 29/9a(S) and 29/9b, UK North Sea. Geological Society Memoirs 52: 349-359.https://doi.org/10.1144/M52-2018-31. © Geological Society of London 2020.





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