Integrated seismic and well gamma-ray analysis for delineation Sienna channel depositional architecture, offshore West Nile Delta, Egypt

ABSTRACT The Nile Delta gas reservoirs are dominated by Plio-Pleistocene and Miocene channel deposits which became nowadays the key player for gas production in Egypt. These channelized features are spectacularly imaged on high-quality seismic data, this paper deals with channel geomorphology imaging using different geophysical and geological tools for better under-standing its architecture and fairway delineation in Sienna field also delineating some reasons for reservoir compartmentalization in the studied area which acts as an analogue for the marine slope channels in Pliocene reservoirs within West Delta deep marine concession (WDDM).Seismic attributes were used like Root Mean Square (RMS) amplitude extraction, Ant tracking and Spectral decomposition and finally pre-stack seismic inversion products. By correlating seismic signature with wells log data, four depositional cycles in the Sienna channel were identified which are stacked upon each other in Sienna canyon. The reason for Sienna system compartmentalization maybe not only effect by faults density but also facies quality which is changes from well to another as a result of distal deposits of turbidity slope channels. The location of new wells could be more precisely delineated for further reservoir development in Sienna channels.