Three main prospect domains have been identified:
The shelf on which at least 7 amplitude anomalies have been
mapped
(Figure
25). Note that these anomalies could only be mapped on the
modern high resolution 2D sesimic acquired in 2001 by Western Geco.
The older data is too varied in acquisition parameters (2 ms and 4
ms sample rates, varying SP and receiver station intervals) and
processing sequence (minimum and zero phase, stacks and
migrations).
Faulting is very minor on the shelf, except towards the non-active
transfer zone. The risk of breaching of traps through faulting is
considered minor.
The unrisked STOIIP is in excess of 11 Bbbls.
The Demerara high shows subtle four way dip closures in particular
along the non-active transfer zone. Prospect are, however deep, in
excess of 5000 m and do carry a considerable gas risk, in
particular if charge from the Jurassic is assumed. Unrisked STOIIP
in excess of 1 Bbbls
The last, fully unexplored area is the deep basin north of the
shelf and west of the Demerara high. The likelihood of sandy,
thick turbidite sequences is high. Low subsidence rates of the
shelf in combination with a large supply of clastics from the
Guyana shield allowed the deposition of sand on and beyond the
shelf edge, an important condition for the formation of turbidites.
Clay diapirs and toe-thrusts of slumps from the shelf and/or the
Demerara high created confined basins, in which thicker turbidites
can be expected.