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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. and Gluyas, J.G. and 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 . pp. 349-359.

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.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1144/M52-2018-31
Publisher 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.
Date accepted:16 November 2018
Date deposited:21 November 2018
Date of first online publication:30 October 2020
Date first made open access:30 October 2021

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