New potential hydrocarbon source-rocks in the Lower Eocene Metlaoui Formation (Central-Northern Tunisia, Northern Africa)
Arfaoui, Adel (Université de Sfax (Tunísia). Unité de recherche "Géoressources, Environnements naturels et Changements globaux")
Montacer, Mabrouk (Université de Sfax (Tunísia). Unité de recherche "Géoressources, Environnements naturels et Changements globaux")
Université de Sfax. Département de Géologie

Fecha:	2007
Resumen:	Significant quantities of organic matter accumulated and were preserved in central-northern Tunisia during the Ypresian (Early Eocene). The organic geochemical characterization of the organic-rich facies of the Ypresian Metlaoui Formation (Ousselat and Es-Sfeïa sections) shows their significant potential as source rocks and increases interest in the Central-Northern Tunisia oil play. The TOC content in these rocks ranges from 0. 09 to 3. 71% suggesting their petroleum potential, whereas their T max fluctuates from 429 to 439°C. These values and the predominance of the hetero compounds (NSO; 2-95%) point to low organic matter maturation. The diverse maturity levels reported for these organic-rich rocks never reached the conventional oil window peak stage and resulted from their different locations within the basin. The HI values and the high saturate concentrations (1-91%) compared to aromatics (1-33%), as well as the predominance of short-chain n-alkanes centered atn-C18 and n-C20 are indicative of unequivocal type-II kerogen. The fluctuation of the pristane/phytane ratio (0. 97-2. 53) records changes of the basin redox conditions, which mainly evolved around the sub-oxic range.
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Ypresian ; Source rocks ; TOC ; Tmax ; N-alkanes ; Sub-oxic conditions ; Tunisia
Publicado en:	Geologica acta, Vol. 5, Núm. 3 (2007) , p. 245-254, ISSN 1696-5728

Adreça alternativa: https://raco.cat/index.php/GeologicaActa/article/view/82361
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/105.000000297
DOI: 10.1344/105.000000297

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