Seismic stratigraphy and burial history for source and reservour prediction in the Luderitz basin, license blocks 2412B and 2413B, offshore Namibia
The Lüderitz Basin is one of the four Namibia’s offshore basins on the western African passive margin that evolved during continental break-up and subsequent opening of the South Atlantic during the late Jurassic and Cretaceous. It is considered as a hydrocarbon frontier that is largely under-explored with only one well (2513/8-1) drilled since the wake of hydrocarbon exploration along the Namibian offshore in the 1990s. Selected lines of the GPN13 2D seismic dataset on blocks 2412B/2413B and well 2513/8-1 were used to predict lithofacies in the basin based on seismic stratigraphic interpretation. A Wheeler diagram was constructed to obtain better insight into the time relationships of the depositional systems, and their relationships to surfaces of non-deposition, condensation and erosion. In addition, two model well locations were selected in the basin, one on the shelf and the other at the base of slope. The Cretaceous and Tertiary succession was divided into 19 Seismic Intervals (SI) based on the recognition of 11 seismic stratigraphic surface. As no direct well tie calibration could be carried out the assigning of stratigraphic ages required comparison of the GPN13 lines with interpretations from neigbouring areas contained in previously studies. Lithofacies were predicted based on seismic facies, system tracts, and analogue interpretations presented in publications on studies of neighboring areas. The lithology model proposes the presence of several source, reservoir and seal rock units in both, the syn-rift and post-rift succesions of the study area. The modelled thermal history suggests that potential Lower Cretaceous source rocks may have generated petroleum only at locations of thick overburden, such as the base of slope location.
Seismic stratigraphy, Burial history, Reservoir prediction, Luderitz basin
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