Liassic Source Rocks from Three Wells from the Sea of Iroise (French Western Approaches) and Dorset (UK) Outcrops: Nature and Modeled Maturity History

Deronzier, Jf.; Bruneton, A.; Mondin, J.; Mascle, A.

doi:10.1007/978-3-642-78849-9_12

Cited by 2 publications

(1 citation statement)

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“…The French side of the Western Approaches is better known as the Iroise Sea Basin. The first stage of exploration was completed in the mid 1980s with the drilling of 13 wells but without any significant result except for minor oil and gas shows in Purbeckian and Liassic to Dogger intervals in two wells (Deronzier et al 1994). However, at the same time, the partly onshore Wytch Farm oil field was discovered in southern England, with production expected to reach about 100 000 bopd at the beginning of 1996.…”

Section: Western Approachesmentioning

confidence: 99%

Petroleum exploration and production in France

Lamiraux

Mascle²

1998

First Break

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Section: Western Approachesmentioning

confidence: 99%

Petroleum exploration and production in France

Lamiraux

Mascle²

1998

First Break

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New insights into the stratigraphic evolution of SW Britain: implications for Triassic salt and hydrocarbon prospectivity

Husein

Fraser

Bell

2023

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The discovery of Wytch Farm field in the Wessex Basin, and Kinsale Head field in the North Celtic Sea Basin in the early 1970s, led to exploration interest offshore in the Western Approaches Trough. Despite this activity, little evidence for prospective hydrocarbon resources has been found. To better understand the failures and analyse remaining hydrocarbon potential in this region, we make use of a large collection of new seismic reflection and well data to map Carboniferous to Neogene stratigraphy. The improved seismic imaging has allowed a better interpretation of the hitherto poorly understood, salt-related structures in the South Melville and the Plymouth Bay basins. The implications of the new interpretations for Carnian (Late Triassic), and Carboniferous stratigraphic and geodynamic evolution are assessed and contextualised with regional salt deposition in the Wessex, Bristol, and South Celtic Sea basins. From a petroleum system perspective, the Lias and Carboniferous source rocks are evaluated and modelled to analyse the maturity and evolution of the petroleum systems. We conclude that the Lias is an ineffective petroleum system due to timing and source maturation risk. However, the Triassic salt and associated subcropping faults have produced several possible pre-salt hydrocarbon traps. The traps may be charged from sporadic Mid-Late Carboniferous coal-bearing post-orogenic basins, a petroleum system previously overlooked. Supplementary material : [Appendix showing seismic, well data and petroleum systems boundary conditions. Burial history plots of the petroleum systems modelling scenarios used to generate source rock transformation ratio plots shown in Figs 9 & 10. [Item 1: Spreadsheet with seismic and well data used in the study, and petroleum system modelling input data. Item 2: Raw decompacted burial history plot, and burial history plots of the 3 Lias petroleum systems scenarios] https://doi.org/10.6084/m9.figshare.c.6486999 Thematic collection: This article is part of the UKCS Atlantic Margin collection available at: https://www.lyellcollection.org/topic/collections/new-learning-from-exploration-and-development-in-the-ukcs-atlantic-margin

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Liassic Source Rocks from Three Wells from the Sea of Iroise (French Western Approaches) and Dorset (UK) Outcrops: Nature and Modeled Maturity History

Cited by 2 publications

References 9 publications

Petroleum exploration and production in France

Petroleum exploration and production in France

New insights into the stratigraphic evolution of SW Britain: implications for Triassic salt and hydrocarbon prospectivity

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