FMI sedimentological interpretation, Western Desert, Egypt: An approach for high-resolution facies reservoir anatomy. 9th Middle East Geosciences Conference, GEO 2010.

Abstract

The Bahariya Formation in the Western Desert is one of the major complex oil-bearing reservoirs in Egypt. Many discoveries have revealed the high oil potential in this formation. Detailed sedimentological interpretation was performed over the imaged highly complicated and inconsistent reservoir interval for Abu Roash “G” Member and Bahariya Formation in two drilled wells. Twenty lithofacies types were defined from the images of the two investigated wells. Individual lithofacies were defined based on detailed description of sedimentary structures from the image logs. The sand lithofacies of the Bahariya Formation and dolomite of Abu Roash “G” Member were assigned pay values. The identified electrofacies are calibrated with the cored intervals in one of the two wells. The Bahariya Formation in the studied two wells is interpreted as a tidal flat deposit and characterized by the following subenvironments: barrier bars, tidal channel and tidal flat muds. The Abu Roash “G” Member is considered as a subtidal carbonate and characterized by the presence of frequent secondary dolomite. Correlation is based mainly on the data gained from formation micro imager (FMI) sedimentological facies analysis and interpretation has been carried out to throw light on the lateral facies changes and consequently to solve many problems related to the reservoir complexity. The missing of some facies associations confirms the presence of faulting.