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The Ksour Essaf block lies in eastern onshore and offshore Tunisia where water depth is less than 50m.


4332 km².


The KSOUR ESSAF block is located in the northern part of the Pelagian province. The main tectonic features are short folds oriented along NE-SW and E-W trending axis bounded by faults trending NW-SE, N-S and E-W. The northern part of the area is transacted by tertiary E-W graben. The southern offshore part includes two perpendicular highs: the SW-NE Kerkennah high developed during late Oligocene time and has remained a structural high to the present day and the NW-SE Hana high, which initiated during Turonian time. These pre-existant tectonic features controlled over the Ksour Essaf block, the sediment deposition and facies distribution.


Reservoirs and Seals

Two main Cretaceous reservoirs are organized within the block:

  • The Aptian Serj dolomitic reservoir is considered as a primary target in the Ksour Essaf Open Block. This reservoir tested 1700 BOPD in MAH-2 well and 425 BOPD in MAH-1 well, located immediately to the north. The deep marine claystones of the Albian Fahdene Fm. constitute an effective seal for the Serj reservoir.
  • The Senonian Abiod chalky limestones which producing oil at the vicinity of the block The Coniacian Douleb oolitic carbonates and the Turonian Bireno bioclastic carbonate can be additional targets in the onshore part.

Source Rocks

  • The main source rock within the block is the Albian Lower Fahdene shales and limestones
  • The Upper Cenomanian-Lower Turonian Bahloul limestones and the he Ypresian Bou Dabbous limestones are the main could be additional sources.


  • Traps include anticlines, faulted anticlines.