--> --> Reservoir Potential of the Lower Cretaceous Stratigraphic Sequence in the Western Block of the Shallow Offshore Suriname Study Area

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Recent Discoveries and Exploration and Development Opportunities in the Guiana Basin

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Reservoir Potential of the Lower Cretaceous Stratigraphic Sequence in the Western Block of the Shallow Offshore Suriname Study Area

Abstract

Cretaceous (Albian) to Tertiary sequences. Recently the prospectivity of the Lower Cretaceous interval (Pre-Albian) is being assessed mainly because the ATK-1ST2 well indicated 52-degree API condensate in a thin limestone bed within the, partly drilled and overpressured, upper Albian. The latter indicates potential migration from the Turonian (?) SR as well as possibility for deeper hydrocarbon potential in the Lower Cretaceous, which is stratigraphically onlapping in the Shallow Offshore (SHO) study area. As the presence of effective seals is also proven in this area, the main uncertainty is the reservoir potential, which led to the objective of this research: the assessment of the reservoir potential within the Lower Cretaceous interval. The study area for this research is limited to the Western part of the SHO. The research included a structural evaluation in terms of understanding the impact of the tectonic evolution on sedimentary systems as well as a stratigraphic evaluation in terms of sequence stratigraphic analysis. The main findings showed that the tectonic evolution resulted in the development of paleo-highs related to fault-controlled hinge lines. The Lower Cretaceous Interval is interpreted as an overall transgressive back stepping system bounded by unconformities and flooding surfaces. Finally, this study resulted in two potential reservoir models for the Lower Cretaceous interval of the Western Block of the SHO area: (1) karstified carbonates and (2) clastic shoals.