A series of basement highs and rift basins, developed along the line of the north-south trending Mozambique Fracture Zone, separate the Zambezi and Mozambique Coastal Plain provinces. These include the Barra Falsa High and the Chissenga and Urema grabens. Although located mainly onshore, the Mozambique Coastal Plain is underlain by highly extended, or possibly oceanic, crust, with several wells reaching Lower Jurassic basalts. This is overlain by an Upper Jurassic to Tertiary section that includes several cycles of prograding mid to late Cretaceous shallow marine to shoreface and deltaic sands, deposited by the Urema Delta. Reservoirs include high quality deltaic sandstones in the Cenomanian (Domo Sandstone) and stacked shallow marine bar sands in the Campanian / Maastrichtian (Lower Grudja).
In the east the Jurassic / Cretaceous aged Chissenga Graben is located within the north-south trending Save Sub-basin, which hosts the Njika and Buzi gas discoveries in the Lower Grudja and the small Nemo oil and gas discovery in the Domo Sandstone. In this area the the Lower Grudja and Domo provide exploration targets in low-relief structural traps, pinch-outs and platform margin subconformity traps.
Located on the Pande-Temane High, a broad horst block on the west flank of the Save Sub-basin, the Pande and Temane fields are gas-bearing in Lower Grudja sands, which also form stratigraphic traps on the eastern flank of the structural high, in isolated sands at the Inhassoro Field (including the G-10 oil reservoir). Pande condensates and Inhasorro oils can be correlated to a likely Lower Domo source.
West of the Pande-Temane High and the Mazenga Plateau, the NNW-SSE to N-S trending Palmeira, Changani, Mazenga and Xai-Xai grabens developed in several phases during the Jurassic, early and late Cretaceous and the early Tertiary, with the offshore Xai-Xai Graben overlain by the Tertiary Maputo Sub-basin.Mozambique Plain Data