|Most of the exploration efforts in Madagascar have been concentrated in the main sedimentary basins: Ambilobe, Majunga and Morondava.
However, the East coast and Cap Sainte Marie basins present some interest too. The prospectivity of the latter basin can be extended to the Plateau of Madagascar, which constitutes the continuation of Madagascar island southward.
The two giant oil fields of Tsimiroro and Bemolanga were sourced by the lagoonal to lacustrine Lower Triassic, wide spread in East Africa.
The Toarcian, the Middle Jurassic condensed series and the Neocomian have been proven to be good sources containing type II and III organic matter and T.O.C. ranging from 2% up to 26%.
Immature oil trapped within the Senonian outcrops leads to presume that the Senonian could act as good source rocks in subsurface and more particularly for offshore prospects.
With respect to reservoir rocks, the Karroo system provides many sandy levels. They could be prospective for shallow targets
The reservoirs of the Post Karroo System are composed of sands, reefs and dedolomized carbonates for the Dogger, turbidites, deep sea fans and, sandy bodies associated to low stand wedge system deposition.
The structural trapping systems are associated to the main tectonic events, which have affected the sedimentation
CHRONOSTRATIGRAPHY AND PETROLEUM POTENTIAL