The Bannan Oilfield is on its later stages of development, new discovery of oil potential is inevitably the most reliable way in sustaining its historical importance of production. A refined technique portfolio is developed to achieve a better understanding of reservoirs featuring heavily faulted, low relief, thin beds with narrow lateral extension. The problems arising from the recognition of micro-faults, tiny blocks, and microstructures are tackled in this paper through a series of techniques as: seismic aided genetic correlation, slant well trajectory calibration, 3D seismic well tying, wavelet domain coherence and true three-dimensional seismic based structural modeling. The spatial extension of individual sand bodies is delineated based on micro facies analysis and lithological inversion. The study shows that the distribution of oil and gas accumulations is governed by both structural features and lithological variations. Sub-bed group structures are well developed. These micro structures, together with the fault proximity regions and the previous undiscovered oil bearing sand bodies contribute to the major sustaining potential. The promising oil and gas flows of the 3 wells drilled based on this study are prudently advertising the remarkable value of this technical practice in extending the life of developed oil fields.