Structural Interpretation of 3D Seismic Data of Ohaji Oil Field, Niger Delta was carried out to show the ability of seismic survey to image the subsurface structures and their closures that are favourable for the accumulation of hydrocarbon. Within the study area, the Agbada Formation consists of the vertically stacked reservoir sequences, with reservoir thickness from the correlating intervals ranging from 25 – 250 ft. This study revealed a complex pattern of subsurface structures, where the northern area is made of widely spaced simple rollover structures bounded by growth faults that are interpreted to be triggered by the movement of the deep-seated, over-pressured, ductile marine shale and aided by slope instability; a middle zone in which faulted rollover anticline prevails and a southern area characterized by collapsed crest structures. The 7480ft sand was interpreted to contain non-associated oil trapped in an annealment phase trap. In conclusion, as a result of this complex structural pattern, growth faults related to anticline traps are segmented by normal faults and they are therefore potential problems of fault seal breaching, lateral extent of some of the reservoirs and lack of amplitude support
Keywords: Agbada formation, Seismic, anticlinal traps, faults, growth fault, reservoir, structural interpretation
