The Edop Field Intra Qua-Iboe (IQI) reservoirs are comprised of complex Pliocene deepwater channel sands. Reservoir connectivity and the potential for by-passed oil are the two major challenges in maximizing recovery from this field. Integration of seismic and reservoir performance data has become a key tool for identifying opportunities and improving recovery in this complex geologic environment.
Gas injection into the two main IQI reservoirs, the IQI-2 and IQI-3, began in 1997. This significantly arrested production decline, and thereby improved recovery. However, due to compartmentalization and difficulty in predicting the extent of lateral and vertical communication between the channel sands, developing an effective gas injection system has been challenging.
Positive pressure response has been noted in all of the fault blocks receiving gas injection, but the response has not always been in proportion to the gas volume being injected. Reservoir performance data has further indicated that some intervals, which have had no direct gas injection, have also been receiving varied levels of pressure support.
In Edop Field, understanding of reservoir interconnectivity and compartmentalization has become key to production uplift and pressure maintenance. This paper will address how integration of seismic data with reservoir pressure and production performance has helped to identify some significant by-passed oil opportunities as well as improve recovery.