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Hydrocarbons

Trap Styles

Exploration plays and tectonic events are linked.

RELATED FAILED RIFT STRUCTURES

The petroleum traps related to the failed rift are constituted by tilted faulted blocks, flower structures settled during the southeastern drifting of Madagascar, draping anticlines on high basement or horst. These structures can be encountered in Majunga basin, within the Ankara trough, in Morondava basin, within the Karroo corridor, Berenty trough and Vohidolo high.


FLOWER STRUCTURE DRAPE ANTICLINES
PERMIAN TILTED FAULTED BLOCKS

The passive margin contains, roll over anticlines, flower structures, stratigraphic traps, tilted faulted blocks, trapping associated with salt tectonic.

RELATED PASSIVE MARGIN STRUCTURES

The structures related to the passive margin are located in the Ambilobe, Majunga and Morondava basins. The slope boundaries of the Middle Jurassic and paleo-valleys of the uppermost Lower Cretaceous can be mapped.

Result of a well indicated good light oil show within Albo-Cenomanian low stand wedge sand.

CRETACEOUS STRATIGRAPHIC
AND KARROO STRUCTURAL TRAPS OF MANAMBOLO
STRUCTURES RELATED TO SALT TECTONIC - MAJUNGA DEEP OFFSHORE 

DAVIE RIDGE MOZAMBIQUE CHANNEL

Hydrocarbon Potential

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