Subsurface Structures of Onshore Fuba Field, Niger-Delta, Niger

The subsurface structural features of the Fuba Field Onshore Niger Delta, Nigeria using Well-log and 3D Seismic data are here presented. Well-to-Seismic ties, faults and horizon mapping, time-surface generation, velocity modelling and depth conversion were carried out using Petrel software. The structural interpretation of seismic data reveal highly synthetic and antithetic faults which are in line with faults trends identified in the Niger Delta. Of the 29 interpreted faults, only synthetic and antithetic faults are regional, running from the top to bottom across the field. These faults play significant roles in trap formation at the upper, middle and lower sections of the field. Two distinct horizons were mapped. Fault and horizon interpretation reveal closures which are collapsed creatal structures bounded by these two major faults. The depth structure maps reveal anticlinal faults. Reservoirs are found at a shallower depth from 6500 to 7500 ft and at a deeper depth ranging from 11500 to 13000ft. The depth residual maps reveal higher residuals associated with the eastern and western regions which are areas not penetrated by any well. The synthetic and antithetic faults act as good traps for the hydrocarbon accumulation in the study area. In reservoirs, hydrocarbons were encountered by all seven wells drilled in the field.