SUBSURFACE GEOLOGICAL SETTING OF ZEIT BAY OIL FIELD, GULF OF SUEZ, EGYPT  ADEL A. E. EL-BASSYOUNI *, SAMIR A. AWAD *, ZAKARIA. H. LOTFY ** and AMIRA I. K. OMAR** *Ain Shams Univ., Faculty of Science, Geol. Dept **Ain Shams Univ., Faculty of Education, Biol. Deptز The Zeit Bay oil field is an off shore oil field, it is situated in shallow water area in the western side of the Gulf of Suez while a part of it extended to Ras El Bahar peninsula. The field production is established many reservoir units ranging in age from Pre-Cambrian fractured basement, Paleozoic and Mesozoic sandstones of Nubia facies and Tertiary Rudeis-Kareem carbonates as well as Belayim carbonates. The present work aims to throw more light on the subsurface setting, litho-stratigraphy, and depositional environments of the Miocene sequence in Zeit Bay oil field. Seven drilled well data in Zeit Bay oil field, including rock character; thickness variation, correlation and facies changes are used to build up the geologic history of the studied field.