Facies analysis and depositional environments interpretation and Petrophysical evaluation of the Pliocene Kafr El-Sheikh Reservoirs at Sapphire Field, West Delta Deep Marine, Egypt

Ismail, Heba; Shehata, Amer A.; Ismail, Amir; Attia, Tamer E.

doi:10.21608/ajbas.2025.361285.1250

Facies analysis and depositional environments interpretation and Petrophysical evaluation of the Pliocene Kafr El-Sheikh Reservoirs at Sapphire Field, West Delta Deep Marine, Egypt

Document Type : Original Article

Authors

¹ Geology Department, Faculty of Science, Port Said University, Port Said 42522, Egypt

² Geology Department, Faculty of Science, Helwan University, Cairo, P.O. 11795, Egypt

10.21608/ajbas.2025.361285.1250

Abstract

The Early Pliocene Kafr El-Sheikh channels represent potential reservoirs at Sapphire Field, located in West Delta Deep Marine Concession, Mediterranean. Despite recent advanced exploration in the Offshore Nile Delta region, the detailed depositional setting and reservoir quality of Sapphire Field are still poorly understood. This study aims to identify the depositional environment of different members of Kafr El-Sheikh formation (Sapphire-60, Sapphire-70, and Sapphire-80) and evaluate its petrophysical parameters. The analysis relies on wireline logs obtained from Sapphire-Dh (st1) deviated well, gamma ray log used in distinguishing reservoir from non-reservoir units and GR patterns contribute in understanding environment of the deposition as well as resistivity, neutron, and density logs are used in petrophysical evaluation. The left deflection of gamma ray log reflects that the main lithology of members is sandstone and the GR curve patterns include three types (cylindrical/blocky, bell-shape, and bow-shape) which indicate different depositional elements of deep marine slope channel system. The petrophysical calculations of sandstone intervals, suggesting their potentiality as reservoirs, characterized by effective porosity ranging from 22.8 to 25.6%, minimal volume of shale 14.7 and 15.7%, water saturation varying from 22.9 to 44.5%, hydrocarbon saturation ranging from 55.5 to 77.1%, and Net To Gross varying from 0.42 to 0.73. Kafr El-Sheikh Formation exhibits potential gas-bearing zones with varying degrees of reservoir quality. This analysis serves as a foundation for further exploration and development in Sapphire Field and in the neighboring regions within West Delta Deep Marine Concession.

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