Seismic Stratigraphic and Petrophysical Characterization of Reservoirs of the Agbada Formation in the Vicinity of ‘Well M’, Offshore Eastern Niger Delta Basin, Nigeria

Abstract

Two dimensional seismic and composite well logs from well M in the eastern offshore Niger delta basin were used to carry out a seismic stratigraphic and petrophysical characterization of reservoirs of the Agbada Formation. Three seismic sequences have been delineated within a time window of 600 ms-2200 ms showing depositional environments that have prograded from the delta platform in seismic sequence one (S1) down to the wave dominated prodelta /slope in seismic sequences three (S3). Five seismic facies (F1, F2, F3, F4, and F5) have been mapped within the study area with F2, the hydrocarbon habitat, consisting of deltaic distributary channel fills. The deposits of F2 were formed during aggradation to progradation of the delta and are considered to be High stand system tracts (HST) reservoirs. Twenty reservoirs zones (A-T) were identified with porosity ranging from 0.192 to 0.423 and permeability from 5.078 to 12,397.895 md, indicating very good porosity and permeability as a result of the low shale volume (0.031-0.148). The values for the bulk volume water are constant or nearly constant throughout the reservoirs and the reservoirs are said to be at irreducible water saturation implying the reservoir can produce water free hydrocarbon hence they are very good hydrocarbon reservoirs. The reservoirs qualities of well M are good and some of the reservoirs are petroliferous. Therefore, Well M could serve as a control well in hydrocarbon exploration in the offshore depobelt.