| dc.description.abstract | Three western sedimentary basins (Morondava, Majunga and Ambilobe) constitute
the main area of interest regarding the hydrocarbon potential of Madagascar. They result
from the separation of the island from Africa. Nine depositional sequences are observed in
these basins leading to development of important geological formations such as Sakoa,
Sakamena, Isalo, Bemaraha and Sitampiky. Moreover, nine potential reservoir rocks and
four potential source rocks have been identified in the western sedimentary basins.
Concerning the hydrocarbon potential, the Jurassic and the Cretaceous plays are the most
attractive, respectively, in Majunga and Morondava basin. Many trapping mechanisms are
found among Madagascar plays. Most of them contain rollover structures.
The hydrocarbon exploration in Madagascar Island started in early 1900. It is
subdivided in four rounds or phases. Seventy five wells have been drilled so far. Most of
them are located onshore Morondava. The exploration led only to few discoveries of gas
accumulation (Eponge, Mariarano, Sikily, and West Manambolo), two heavy oil accumulation
(Maroaboaly and Tsimiroro), one light oil accumulation (Manandaza) and one tar sand
deposit (Bemolanga). The past explorations showed a general lack of success. The main
reason was the poor quality of available seismic data used by companies. Nowadays,
Madagascar has three hundred sixty three blocks which 94% are located offshore. The
country also established petroleum activities regulations with regard to environment
protection. The main texts are the Malagasy Petroleum code, the charter of environment and
the MECIE decree. | no_NO |
