The Kairouan block is located in eastern onshore Tunisia.
KAIROUAN block block is localized in the Sahel foreland basin. It is characterized by the low-lying topography. This later reflects the recent subsidence of this area where Oligocene-Quaternary sediments up to 2 000 m thick are preserved. This late Tertiary basin is controlled to some re-activation of ENE-WSW strike-slip faults. Structures beneath and within this late Tertiary cover include extensional fault blocks in the Mesozoic to Early Tertiary section, strike slip faults and related pop-up transpressive features, with inversion of earlier structures extending up through the overburden .
Reservoirs and Seals
- The Senonian Abiod Formation comprises a chalky limestone and producing oil in Sidi El Kilani oill field, is considered as a primary target in Kairouan open block. It reservoir quality is largely controlled by fracturation and locally Dolomitization. The Paleocene El Haria shale provides the main seal.
- Turonian/Coniacian Bireno/Douleb carbonates, Cenomanian Zebbag carbonates, Aptian Serdj dolomite and Jurassic Nara dolomites are considered as the secondary targets.
- Two main source rocks recognised within the Kairouan block; the Albian Lower Fahdene Formation and the Upper Cenomanian - Lower Turonian Bahloul Formation.
- The most of the discovered hydrocarbons occur in low-relief anticlines, high-relief inversion structures associated with strike-slip faults (pop-up structures).