Seismic-Well Integration for Reservoir Extent and Depth Evaluation in the WABI Oil Field, Niger Delta Nigeria

Accurate reservoir delineation in geologically complex settings such as the Niger Delta requires integrated interpretation of seismic and well log data. This study focuses on the WABI Oil Field, where five well logs and a 3D seismic dataset were analyzed to characterize reservoir extent and depth. Well log correlation identified a primary reservoir interval between 9270 ft and 9980 ft, consistent with regional subsurface trends. A seismic-to-well tie was performed using a synthetic seismogram generated from a calibrated sonic log and density log. A non-linear third-degree polynomial velocity function was derived to enhance time–depth conversion accuracy. The interpreted reservoir horizon was mapped across the seismic section, and time and depth structure maps were constructed. The resulting depth map revealed a structurally continuous, fault-free reservoir ranging from 9000 ft to 13,500 ft. These results highlight the effectiveness of seismic-well integration for improving structural interpretation, reducing exploration uncertainty, and supporting reservoir development strategies in deltaic petroleum systems.