HYDROCARBON SYSTEMS AND PLAYS

Figure 4Stratigraphy

Numerous sandstone and, to a lesser degree, carbonate quality reservoir objectives have been penetrated in wells along the shelf and coastal areas. In consideration of the thick sedimentary section further offshore, equally potential reservoir sequences are expected (Fig. 4).

Source Rocks

Figure 5Permo- Triassic lacustrine shale, the established source for the Bemolanga Tar Sand deposit, can be expected in any of the offshore sectors underlain by continental crust (Fig. 5).

Lower Jurassic rich, oil-prone shale has been identified in two basins and most likely is present in others. Also, geochemical results from well data indicate extensive occurrence of oil and gas-prone source beds of Middle Jurassic to Upper Cretaceous age. Throughout the study area, there is evidence for a consistent increase of argillaceous facies and organic matter basinward, as would be expected. This evidence coupled with the likelihood that faulting associated with the Davie Fracture Zone formed barriers to circulation, suggests that deposits with oil-prone kerogen may be prevalent within the Jurassic - Cretaceous section.

Figure 6Trap Types

A wealth of trap types of potentially major dimensions have been identified, including salt structures, tilted fault blocks, horsts, drape anticlines and flower structures (Fig. 6 & 7).

The combination of multiple reservoirs and source rocks and the seismic evidence for numerous structural leads suggests the presence of a wide variety of plays with major resource potential.

Figure 7TGS NOPEC has available for purchase 2000 kilometers of 98 fold CDP (2D) seismic data acquired in 2001.