For Ministry of Mines and Hydrocarbons (MMH), Equatorial Guinea
The 3D seismic surveys clearly show the basinward extension of both the Lower Miocene (Douala basin) and the Cretaceous (Rio Muni) turbidite fairways. The Lower Miocene reservoir sand deposition (basinward of the Aseng and Alen fields in Blocks O&I) was controlled by developing structure providing both structural and stratigraphic trapping potential. Likewise, the Palaeogene and Upper Cretaceous reservoir sand deposition (basinward of the Okume and Ceiba fields) is recognised, again with both structural and stratigraphic trapping potential. Both plays have clear AVO anomalies associated with both structural and stratigraphic traps. The surveys straddle the Bioko Deformation Zone where large structures have formed in response to Early Miocene re-activation of fracture-zone faults. The area falls within the influence of proven petroleum systems linked to source rocks in the Palaeogene and Upper Cretaceous sections. Kitchen areas are modelled for these source intervals across the region with favourable late timing of maturation.