Reservoir hydrocarbon prospectivity and productivity evaluations of sands S-600 and S-700 of Fega field, onshore Niger Delta Basin, Nigeria

Sedimentological and palynostratigraphical modeling of sediments penetrated by KW field wells, onshore western Niger Delta Basin, Nigeria

“…The total subsidence of the oil-rich Niger Delta Basin resulted from the compaction of unstable shale through the driving subsidence of the basement, differential sediment accumulation, and lithospheric contraction [ 18 , [20] , [21] , [22] , [23] , [24] ]. The Niger-Benue River systems through the Anambra Basin and the Cross River system through the Afikpo Basin were responsible for the high density of sediment inputs in the Niger Delta Basin [ [24] , [25] , [26] ]. The late Cretaceous Abakaliki Anticlinorium separated the two rivers in the Eocene-Oligocene times [ 25 ].…”

“…The Niger-Benue River systems through the Anambra Basin and the Cross River system through the Afikpo Basin were responsible for the high density of sediment inputs in the Niger Delta Basin [ [24] , [25] , [26] ]. The late Cretaceous Abakaliki Anticlinorium separated the two rivers in the Eocene-Oligocene times [ 25 ]. The Benue and Bida Basins were the two failed arms [ 22 ].…”

“…This growth fault also serves as a seal to migration. The coarsening-upward progradational sequence within the clastic wedge and the global regression of depositional environments contribute to the age of the Niger Delta basinward [ 20 , 25 ].…”

“…The petroliferous Cenozoic Sequence of the Niger Delta Basin comprises from the base to the top: the Akata Formation, Agbada Formation, and Benin Formation [ 8 , 18 , 20 , 23 , 25 , [31] , [32] , [33] , [34] , [35] , [36] , [37] ].…”

“…The thickness of the formation ranges from 5000 m (6600 ft) at the most distal part of the basin to 7000 m (23000 ft) at the central part of the clastic wedge beneath the continental shelf of the basin [ 23 , 33 , 34 ]. The lenses of sandstone in the Akata Formation were laid down as turbidite and continental slope channel fill, deposited in delta-front to deeper marine environments [ 25 , 33 ]. The shale is characterized by both planktonic and benthonic foraminifera [ 28 , 29 ].…”