The Zambezi Delta and Beira High

The Zambezi / Beira High segment is separated from the Angoche by a NNW-SSE trending transform; probably an extension of the Prince Edward Fault Zone. Towards the shore an Upper Jurassic to Cretaceous sediment wedge, up to 9 km thick was deposited over an aborted mid Jurassic (Callovian) rift basin in the Zambezi Delta Depression. The Zambezi Delta developed from the late Cretaceous (Campanian), with up to 4 to 5 km of sediment.

Sediments thin to the south-east, with onlap and pinch-out of the Upper Jurassic and Cretaceous section against the Beira High, a large block of continental crust located south of the rift zone and directly north of the oceanic margin. Along the northern flank of the Beira High, the sedimentary section thins to 6 km and to 3 km over the crest.

No wells have been drilled on or flanking the Beira High, whilst wells drilled on the Zambezi Delta have proved to be either off-structure or lacking reservoir at the objectives down to the Upper Cretaceous (Maastrichtian). Therefore petroleum systems in the southern Zambezi Delta Depression and over the Beira High have not been tested. Similar to adjacent areas, seismic shows deep-water channel / fan development in the Upper Cretaceous (with potential pinch-out traps against the Beira High) and the Lower Tertiary, which may drape over the crest of the high. Additional potential includes Jurassic and possible Permo-Triassic Karroo rift basin systems that are seen on the flanks and cutting the crest of the Beira basement high. South of the Zambezi Delta Basin depocenter, potential source rocks in the Jurassic and Lower Cretaceous would lie within the oil window.

Zambezi Datasets