Reservoir Characterisation of the Jurassic Safa Formation, Shoushan Basin, North Western Desert, Egypt.

Document Type : Research and Reference

Authors

1 Geology Department, Faculty of Science, Tanta university, Tanta, Egypt

2 Geology Department, Faculty of Science, Tanta University Tanta 31527, Egypt

3 Geology Department, Faculty of Science, Tanta University

4 Exploration General Manager and Member of the Board of Directors - PetroNefertiti Petroleum Company

Abstract

This study assesses the lithological and petrophysical properties of the Jurassic Safa reservoirs in western part of the Shoushan Basin, north Western Desert of Egypt. Composite logs from five wells from TUT and Salam fields were utilized to evaluate the different petrophysical parameters. Well log analysis, using Density/Neutron (D/N) dia-porosity and tri-porosity (M-N) cross-plots, have been used to determine the lithology and porosity of the studied reservoirs. Litho-saturation results reveal that the Lower Safa Member is composed of sandstone as a major lithological constituent and a few beds of limestone, with shale intercalation and calcareous cement, while the Upper Safa Member contains shale as the principal lithological component and a few beds of limestone, with sandstone bodies and calcareous cement. Effect of natural gas appears in some D/N cross-plots in both Members. Petrophysical parameters derived from vertical litho-saturation cross-plots were used to identify the most effective sand zones in each well. Movable hydrocarbon is found to increases mostly at the top and middle parts of the L. Safa reservoir and at the middle and bottom parts of the U. Safa reservoir. In terms of hydrocarbon potentiality, the studied reservoirs of Øeff, Vsh, Sh, Sw, net sand thickness, net pay and net pay to gross-sand were determined for the Lower and Upper Safa Reservoirs, respectively. Constructed iso-parametric maps of the Lower and Upper Safa reservoirs display that, the northern part; and the eastern and south-eastern parts of the studied fields are the most areas for future development, respectively.

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