Distribution of clastics is directly linked to the underlying diapiric movement of the Akata Shale. Imaging the complex interplay between these two formations is key in understanding prospectivity, according to PGS.
Offshore staff
OSLO, Norway — PGS is reprocessing about 2,000 sq km of 3D seismic data over the OPL248 lease offshore Nigeria.
The goal is to improve imaging of Agbada Formation reservoir targets, using a modern broadband processing flow. Final pre-stack depth migration products should be available in September.
The Niger Delta Basin features up to 12 km of late Cretaceous-to-Quaternary age clastics deposited in an upward-coarsening regressive deltaic sequence. Main source rocks are Akata Formation marine shales and Lower Agbada Formation paralic shales.
According to PGS, the proven reservoirs feature unconsolidated Agbada sandstones deposited as stacked turbidite channel and fan complexes. The largest accumulations are trapped in roll-over anticlines in the hanging-walls of growth faults. However, there may also be hydrocarbons in fault closures and stratigraphic traps.
PSDM reprocessing should improve illumination of the complex structures associated with the diapiric movement of the Akata Shale, helping to de-risk exploration.
