The cores display are focused on two boreholes drilled off the west coast of South Africa within the northern Orange Basin. Borehole A-J1 was drilled in 1988 in a synrift graben structure, within a water depth of 149m to a total depth of 3728m. This well discovered a waxy oil in fluvio-lacustrine reservoir sands. When the well was tested, a 10-meter-thick sandstone interval at about 3,250 meters flowed 191 barrels of 36° API oil per day. Borehole A-F1 was drilled in 1988 within a water depth of 166m order to test for hydrocarbons on the downthrow side of a fault-controlled structure associated with stacked vertical closures. No significant hydrocarbon bearing reservoir or good quality source rock were encountered, but the borehole was classified a well having encouraging gas shows.
Intervals and length of core per borehole.
A-F1 – 16m
Intervals:
Albian to Early Cenomanian
Late Aptian to Mid Albian
Mid Aptian to Late Aptian
A-J1 – 9m
Intervals
Aptian to Albian
Tithonian to Berriasian