Angoche Geology

The Angoche segment of the Mozambique margin has a thick sedimentary wedge, with up to 7,000 m of Upper Jurassic to Tertiary sediments, mostly overlying extended continental crust and a Lower to Middle Jurassic rift system. The presence of halokenetic structures in the shallow offshore indicate development of a syn-rift salt basin, analogous to the Lower Jurassic Mandawa Basin (coastal Tanzania), where salt is associated with oil-prone lacustrine black shales. Oil seeps on the Angoche coast (and southern Rovuma) may be related to this source.

Although undrilled, 2D and 3D seismic indicates the development of large-scale slope-fan sandstones, particularly within the Cenomanian / Turonian and Paleogene, with potential stratigraphic traps and structural closures draped over syn-rift highs. Reservoir development at these levels is supported by seismic amplitude and AVO anomalies, with potential DHIs (bright spots). Seismic response indicates potential source development in the Aptian, equivalent to the Lower Domo Shale and a potential gas / condensate and light oil source.

Along the eastern margin of the Angoche Sub-basin the Cretaceous section is partially subducted below continental fragments along the Davie Fracture Zone. Repeated phases of deformation along the western flank of the ridge provided structural plays associated with Cretaceous and Lower Tertiary sands, including compressional anticlines and extensional fault blocks.

Angoche Data