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Abstract

Bredasdorp Basin covers approximately 18,000 km 2 beneath the Indian Ocean along the southern coast of South Africa, southwest of Mossel Bay (Figures 1, 71). The basin is filled with Upper Jurassic and Lower Cretaceous (lower Neocomian) synrift continental and marine strata and postrift Cretaceous and Cenozoic divergent margin rocks, as illustrated in Figures 9, 10, and 72. The basin is bounded on the west and southwest by the Agulhas Arch and on the northeast by the Infanta Arch. The Bredasdorp Basin opens southeastward to connect with the Southern Outeniqua Basin, which is terminated on the southeast by the Agulhas-Falkland Fracture Zone (Figure 73). Reactivated rift faults are prominent along the margin of the Agulhas Arch, and minor faults define the northeastern margin of the Infanta Arch.

The first exploratory borehole drilled in the Bredasdorp Basin during 1970 by Soekor (Pty) Ltd. was located on the northern flank of the basin. The initial test encountered subcommercial gas and condensate in lower shoreface sandstones within the drift succession. This first wildcat borehole did not intersect synrift reservoirs beneath the drift onset unconformity. A second borehole, drilled on the northern flank of the basin in 1972, intersected porous synrift coastal marine sandstones just below drift onset unconformity 1At1 (126 Ma). Postrift reservoirs in the second wildcat were absent, but the borehole intersected rich, immature source rocks of Aptian age.

During the 1970s, Soekor's exploration continued to focus principally on the synrift succession containing shallow marine sandstones just below the drift onset unconformity

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