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Comptes Rendus Géoscience
Volume 338, n° 10
pages 683-692 (août 2006)
Doi : 10.1016/j.crte.2006.05.007
Received : 11 December 2005 ;  accepted : 8 May 2006
Relation entre évolution de la matière organique et caractéristiques géostructurales : exemple du bassin yprésien en Tunisie centro-septentrionale
Relation between evolution of organic matter and geostructural characteristics: case of the Ypresian basin in central-northern Tunisia

Adel Arfaoui , Mabrouk Montacer
Laboratoire de géochimie organique, département de géologie, faculté des sciences de Sfax, BP 802, 3038 Sfax, Tunisie 

Auteur correspondant.

Une étude systématique des contenus organiques de faciès riches en matière organique, provenant du bassin yprésien de Tunisie centro-septentrionale, a permis de montrer que la matière organique était exclusivement dʼorigine marine (lignée II), et nʼavait pas atteint, à lʼaffleurement, la fenêtre à huile. Cette étude suggère que la dynamique du bassin yprésien a joué un rôle dans la distribution, la préservation et la composition de la matière organique. LʼYprésien a connu un événement anoxique favorable à lʼaccumulation et à la préservation de bonnes quantités de matière organique, résultant dʼune intense productivité primaire. Pour citer cet article : A. Arfaoui, M. Montacer, C. R. Geoscience 338 (2006).

The full text of this article is available in PDF format.

The geochemical analysis of the organic-rich facies from the Ypresian basin in central-northern Tunisia shows that the organic matter is marine originated (type II) and displays a low thermal maturity level in outcropping samples. This study proves that the distribution, conservation and, therefore, the composition of the organic matter have been controlled by the dynamic of the Ypresian basin. The Ypresian period corresponds to an anoxic event, which led to the accumulation and preservation of good quantities of organic matter derived from a high primary production. To cite this article: A. Arfaoui, M. Montacer, C. R. Geoscience 338 (2006).

The full text of this article is available in PDF format.

Mots-clés : Événement anoxique, Matière organique, Yprésien, Pyrolyse Rock-Eval, Tunisie

Keywords : Ypresian, Organic matter, Anoxic event, Rock-Eval pyrolysis, Tunisia

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