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Table of Contents


Vol. 9 - 2010

Vol. 8 - 2009

Vol. 7 - 2008
SP 1 - 2008

Vol. 6 - 2007
Vol. 5 - 2006
Vol. 4 - 2005
Vol. 3 - 2004
Vol. 2 - 2003
Vol. 1 - 2001-2002

Notes for Authors
(PDF - 80 kb)



GeoActa Special Publication 1 2008


Acquisto online

GeoActa
an international Journal of Earth Sciences


Adel Arfaoui, Mabrouk Montacer
Unite´ de recherche «Georessources, Environnements naturels et Changements globaux», GEOGLOB code 03/UR/10-02, Universite´ de Sfax, Faculte´ des Sciences, Departement de Geologie. B.P. 802, 3038 Sfax, Tunisia. E-mail: arfmon@yahoo.fr, Mabrouk.Montacer@univgb.rnu.tn

Geochemical characterization of Lower Eocene organic-rich facies in Central-Northern Tunisia


Volume 5, 2006, pages 1-12

PDF (481 KB)
Abstract

The study of Lower Eocene organic-rich facies at Chaker and Serj Jebels, in central-northern Tunisia, was carried out in order to characterize their geochemical fingerprint. It has been found that the organic matter is located towards the end of diagenesis-beginning of catagenesis. This assumption is supported by the relative low Tmax values (427-442ºC). The marine source fingerprint is predominant, as indicated by the high concentration of aliphatic hydrocarbons (13-91%), compared to aromatics (01-35%), and by the unimodal distribution of nalkanes centered on the light compounds (n-C18 to n-C20). TOC content varies from 0.49 to 3.12% and suggests a sufficient petroleum potential of Ypresian facies in each area. The occurrence of relatively anoxic conditions during the Ypresian led to the deposition of organic rich-facies in Chaker and Serj areas. These episodes were prone to preservation of good quantities of organic matter with relative high primary production. Due to their geochemical characteristics, the Lower Eocene facies represent a new potential source rock in central-northern Tunisia.

Keywords: Lower Eocene; Source rocks; TOC; Tmax; n-Alkanes; Anoxic conditions