The Luderitz Basin blocks contain potential reservoirs within the Lower Cretaceous, Upper Cretaceous and Palaeogene. Three very large structural prospects, with areas each in excess of several hundred square kilometres, have been identified at Lower Cretaceous (Barremian). In addition, there is significant stratigraphic upside within a number of turbidite slope channel to basin floor fan complexes and shelf leads.
In October 2012, Serica completed the acquisition of 4,180 sq. km of 3D seismic data, approximately 25% of the licence area, covering the large prospect at Barremian level identified as Prospect B. The data is of high quality and has provided confirmation that Prospect B exhibits seismic characteristics wholly consistent with a carbonate platform. Two similar four-way dip closed prospects have been identified on the blocks. The seismic also shows the clear presence of turbidite slope channel and basin floor fan complexes extending into the area covered by the 2012 3D seismic survey undertaken by Serica. Further work is being planned to evaluate these potential clastic reservoirs and to extend knowledge of the blocks outside the survey area.
The video below shows a three-dimensional perspective of Prospect B in depth, which clearly reveals a tiered, back-stepping platform geometry. This characteristic, in combination with recognition and mapping of internal seismic geometries including prograding clinoforms and mounded features, is consistent with a large-scale carbonate platform build-up, and is analogous to numerous examples of carbonate-hosted hydrocarbon fields worldwide. Modelling of the seismic data suggests that the internal seismic amplitudes and velocities are consistent with porous carbonate of potential reservoir quality.
The seismic interpretation suggests that the Barremian carbonate platform is draped by thick Aptian marine oil-prone shale source rock, which have been proven by drilling both to the north and the south of Serica’s acreage. Thermal modelling of this source rock interval indicates that it is likely to be mature for oil generation and expulsion on Serica’s acreage.