ABSTRACT:

The cyclostratigraphy as an approach has been applied to construct the depositional model, refining the reservoir geometry and understanding of exploitation problems at the reservoir scale. This approach has been achieved through the detailed examination of more than 250m of cores, petrographic analyses of about 300 thin section and integration of electric log characters of 34 wells. In Port Fouad Marine, Wakar and Temsah fields Serravallian-Tortonian section has been divided into four depositional sequences. Each depositional sequence is interpreted to be deposited during one cycle of fall and rise of sea level. A depositional sequence was subdivided into two systems tracts, progradational systems tract PST and retrogradational systems tract RST. PST is representing the falling of the sea level and deposition of lowstand sub-marine fan facies, while RST is representing the rising of the sea level and deposition of highstand marine shale facies. Each systems tract has been deposited in a predictive eustatic sea level event and has recognizable signatures in well logs. The detection of these depositional sequences and their extrapolation at the field scale creates new areas with possible hydrocarbon potentialities.

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