Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/5075
Título: The thermal history and hydrocarbon source rock potential of the mid Carboniferous Quebradas Formation in SW Portugal and its correlatives in western Atlantic offshore basins
Autor: Clayton, Geoff
Fernandes, Paulo
Goodhue, R.
McCormack, Niall
Musgrave, J. A.
O'Donoghue, E. P.
Palavras-chave: Portugal
Quebradas Formation
Carboniferous
Maturity
Thermal history
Data: 2010
Editora: Método Directo
Citação: Clayton, Geoff; Fernandes, Paulo; Goodhue, R.; McCormack, Niall; Musgrave, J.A.; O'Donoghue, E.P.The thermal history and hydrocarbon source rock potential of the mid Carboniferous Quebradas Formation in SW Portugal and its correlatives in western Atlantic offshore basins, Trabalho apresentado em II Central & North Conjugate Margins Conference - Lisbon, In II Central & North Conjugate Margins Conference - Lisbon. Book of Abstracts, Lisboa, 2010.
Resumo: The mid Carboniferous Quebradas Formation of the ‘South Portuguese Zone’ (SPZ) comprises 80m of post-mature black mudrocks with a mean TOC of 2.5%. Lithostratigraphic units of similar facies and age such as the Holywell Shale, the Edale Shale and the Bowland Shale are important HC source rocks in the UK, having sourced a considerable proportion of the hydrocarbons in the East Irish Sea, East Midlands and Formby oilfields respectively. The kerogen content of the Quebradas Formation is mixed but slightly more oil-prone in its lower part. At outcrop, it is strongly post-mature with vitrinite reflectance (Rr) ca. 4%. Illite crystallinity results from the Quebradas Formation and associated units suggest lower maturity than vitrinite reflectance. Analysis of the optic fabric of very thin coal lenses within the Brejeira Formation which overlies the Quebradas Formation suggests that peak temperatures were attained before the Variscan (late Carboniferous – early Permian) deformation. Triassic rocks unconformably overlying the Carboniferous sequence are much less mature, with Rr ca. 1.2%. Although the the Quebradas Fm has no HC source potential onshore due to its high maturity, Carboniferous rocks offshore may not have experienced the same extreme thermal history as the SPZ.
Peer review: yes
URI: http://hdl.handle.net/10400.1/5075
ISBN: 978-989-96923-1-2
Versão do Editor: http://metododirecto.pt/CM2010/index.php/vol/article/view/201/14
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