Figure 21

This example (Figure 21)  illustrates the erosional surface (channeling) at the Base Tertiary unconformity.


Figure 22 is a 3D view of the Top Cretaceous Unconformity. Note also the outline of two slumped masses and the canyons along the shelfslope.

The next main prospect realm is the gently north sloping shelf, i.e south of the presently non-active Transfer Zone. This zone is hardly affected by any later faulting. Subtle changes in the contour pattern attest of slight movements along the Rift boundary faults. The change of beaching of strat-traps through later faulting is considered low.

The stratigraphic trap potential is illustrated with an example, occurring off the east coast of Suriname Figure 23 . The black loop (on the seismic section) terminating updip is considered a prospect. The anomalies occur at a depth of 3500 to 4000 m (below mean sea level). At this depth the impedance contrast between shales and sandstone is small. The presence of hydrocarbons reduces the impedance of sandstone. Hydrocarbon filled reservoirs therefore may show up as soft reflectors (black loops on this data). These prospects have been mapped. An example is shown in  Figure 24.