--> Abstract: Central Tunisia and Related Petroleum Systems; #90063 (2007)

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Central Tunisia and Related Petroleum Systems

 

Derbel Damak, Fayrouz1 (1) Entreprise Tunisienne d'Activités Pétrolières, Montplaisir, Tunisia

 

Central Tunisia belongs to the foredeep domain.The studied region lies especially on the Central Tunisian Atlas.It's characterized by a relatively important subsidence during Mesozoic.Since Lower Cretaceous, an alignement of horsts took place. A raising of the whole region began in the Uppermost Cretaceous. This structural evolution led to an alternating silicoclastic deposits and carbonate platforms that allowed several Mesozoic and Cenozoic petroleum systems in the region. We can distinguish proven reservoirs as the reefal Aptian Serj producing oil at Douleb, Semmama and Tamesmida fields, the bioclastic Vraconian limestones F2B unit producing at Tamesmida oil field. Potential reservoirs in this area are the Upper Jurassic Nara limestones, the Upper Valanginian to Hauterivian dolomitic Douleb 101, the Turonian Bireno carbonates, the Coniacian oolithic and dolomitic Douleb limestones, the Campano-Maastrichtian turbiditic Abiod limestones and the Ypresian Nummilithic El Garia limestones. Most reservoirs are sourced by Cenomano-Turonian laminated and organic rich Bahloul limestones and/or Late Albian(ss) Mouelha marls and/or Fahdene Albian shales. Neocomian Melloussi to Mrhila deposits,Senonian Aleg, Upper Maastrichtian to Lower Paleocene El Haria and Oligo-Mio-Pliocene deposits are mostly overspread and constitute a good seals for the cited objectives. The NE-SW oriented surface anticlines and syclines in the Central Atlassic Tunisia show outcrops from Triassic to recent deposits.These features are seemingly truncated by conjugated NW-SE trending grabens. Thus, several interesting trap styles are recognized in this area: in the grabens, in the horsts located at the borders of the grabens and in the eventually prospects corresponding to the surface anticlines with more or less geometric similarities. Basin modeling indicates a Tertiary expulsion that's in good timing with prospect ages. These good attributes associated with more seismic acquisition should better the exploration succes ratio in the region.

 

AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California