Integrated study was carried out on the Jeffara basin in order to understand and discuss the geometry and the key levels as well as Petroleum System elements on the Jurassic strata.

The studied area lies as N140-130 trending down faulted area roughly parallel to the coastline; it was developed mainly in response stage of Tethyan rifting. The subsurface data reveal that most of the structuring is amplified by halokinesis and the salt piercement of the entire sedimentary cover in the southeast area.

The Mrabtine Formation, which is represented by a mixed siliciclastic and carbonate deposits, is considered to be the best Jurassic potential reservoir rock in the Jeffera basin.

The Callovian shales appear to contain the best potential for source rock off all units in the Jurassic, showing poor to good TOC contents (up to 3.27% TOC) and good petroleum potential up to 10 kg of HC/ton of rock. The kerogens are mainly type II algal material and mix type II and III with locally higher type III organic material in El Bibane and Jerba area.

Several prospects and leads have been identified at the top of the Mrabtine Formation, these structures are extensional fault related (horsts or tilted fault blocks) with a NW-SE orientation. The northern part of the Jeffara basin shows several attractive fault related traps but sedimentological and stratigraphic studies indicate that there would be a risk of poor reservoir characteristics, a lack of source facies and top seal. The southern domain contains fewer structures and leads but more attractive plays with the proven hydrocarbon accumulations of the Ezzaouia and El Biban Fields.

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