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This Lower Cretaceous delta front, hosting a series of over ten rotated fault blocks and toe thrusts, extends into parts of Blocks 45, 48 and 49. Fault patterns are comparable to those encountered in the (conjugate margin) Espoir and Baobab fields on the Ivory Coast. The delta front is host to numerous toe-thrusts, analogous to the prospective hydrocarbon bearing toe-thrusts of the Niger delta. The plays may be fed by a Lower Cretaceous/Jurassic source rock. Side and top seals are provided by normal and thrust faults, as well as shales in the Upper Cretaceous interval.
Upper Cretaceous fans overlying this play bear similarity to those of the Jubilee Oil Field, offshore Ghana.
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Directly in front of the Lower Cretaceous toe thrust plays and of comparable age, lies a well-defined, isolated depression. This mini-basin has an area of approximately 1800 square km and a thickness of 1-2 km in the central part. It could contain a thick interval of source rock, similar to that seen in the DSDP 144 well. A major Jurassic graben fault lies to the south. Seismic facies analysis has revealed multiple sandy packages with amplitude anomalies, pinching out up-dip.
The likelihood of sandy, thick turbidite sequences filling the mini-basin is high. The sands are intercalated with shales and overlain by impermeable Upper Cretaceous source rock that acts as a regional top seal. Substantial amounts of hydrocarbons, in the order of several Billion bbls could be present, as suggested by the thermal & maturation modelling results.
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- Structural Plays on The Demerara Plateau
The Demerara Plateau exhibits many major stratigraphic/uncomformity traps and plays as well as large but deep four-way dip closures, in particular along the active transfer zone. The A2-1 well (2500m), drilled on the apex of an anticline on the Demerara Plateau, contains source rock intervals in Early Cretaceous sediments.
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