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KORBOUS


GEOGRAPHICAL SETTING

The Korbous block is located in the Gulf of Tunis with water depth not exceeding 400 m.

ACREAGE

6472 km².

GEOLOGICAL SETTING

The KORBOUS block block covers two different domains, from the North to the South: we find the imbricated zone defined by NE-SW large folds and thrust structures where Diapiric extrusions of evaporites and clay occur all over the region. This domain is overlapped by extensional Miocene basins. The Atlasic foreland occupies the southern part of the block. It is characterized by relatively large rollover anticlines trending NE-SW, dominated by deep to shallow marine carbonate and shale and marine siliciclastic deposits. The current tectonic framework of the area is guided at least by two NE‐SW trending master faults. Those structures are associated with salt ascension, which have controlled the geodynamic evolution of the region.

PETROLEUM SYSTEM

Reservoirs

  • The Senonian Abiod chalky limestone is considered as a primary target in the Korbous block. The Abiod average thickness is about 100m.
  • The El Haria shale is considered as a seal for this reservoir. A number of secondary objectives include the Lower Eocene Bou Dabbous fractured limestones, the Oligocene-Lower Miocene Fortuna sand and the Lower Cretaceous M’Cherga sandstone.
 

Source Rocks

  • The main source rock recognised in the block is the Albian Lower Fahdene black shale. However, other potential organic levels are identified such as the Ypresian Bou Dabbous organic-rich limestone, the Upper cenomanian-Lower turonian Bahloul laminated limestone.
 

Traps

  • Traps include compressional hanging wall anticlines, footwall fault blocks, rollover anticlines, facies changes and unconformity related traps. Owing to the complexity of the area, mixed traps are also defined in some localities.


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