The presence of hydrocarbons within the basin was proven by the discovery of >1 Billion bbls STOIIP in the Tambaredjo, Calcutta and Tambaredjo NW Fields Onshore Suriname, and by the presence of oil and gas shows in most of the wells drilled offshore.
Reservoir-seal pairs can be found in just about any age bracket. Oil and gas have been encountered in Upper Cretaceous and Tertiary reservoirs as diverse as valley-fills, point bars, shallow marine sands and turbidites. Structuration is intense in the pre-Albian section, with extensional faulting during basin formation, and reverse faulting and folding during the inversion phase (Lower Cretaceous). During the Upper Cretaceous and Tertiary structuration is mild, and the sequence is largely a monocline. However, detailed inspection of seismic data has revealed the presence of large domal structures along the palaeo-shelf edge, which were probably formed as a result of strike-slip movements. |
Shell carried out an oil slick study on Landsat and Spot images in 1995. The detected oil-slick areas are interpreted as the source points of leaking hydrocarbons and indicate a charge of very light oil. Also displayed are the results of a global seep study carried out by Infoterra in 2003, using radar satellites for cloud free imagery. Note the high seep densities in eastern offshore Suriname, likely attributable to the gas-prone nature of the Central Atlantic Petroleum System. Overlain are structural contours of the Aptian surface, which is regarded as a major carrier bed. These indicate the favored migration direction to be towards the south-southeast, consistent with the area of high slick density.
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