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Sedimentological and sedimentary petrographic investigations of the Hamitabat Formation sandstones exhibited a huge submarine fan formation in the northwest of Thrace Basin. In this study reservoir properties of Hamitabat Formation were found out according to sedimentological storage, sedimentary petrographic and petrophysical properties of the sandstone-core samples taken from 16 wells in the northwest of the Thrace Basin. According to analyses of the lithology, sedimentologic structure, texture and sedimentary petrography of the well samples the Hamitabat Formation sandstones were separated into three distinct lithofacies (A, B, and C). Lithofacies A sandstones exhibit coarse grain sizes (0.5-1.0 mm), smooth-point grain contact, subrounded-subangular grains, moderate-bad sorting, and corresponds to upper part of submarine fan formation. Lithofacies B sandstones exhibit medium grain sizes (0.25-0.5 mm), subrounded-rounded grains, concave-convex grain contact, moderate-good sorting, and corresponds to middle part of submarine fan formation. Lithofacies C sandstones exhibit very fine grain sizes (0.12 mm<) corresponds to lower part of submarine fan formation, and nonreservoir facies. Lithofacies A sandstones have medium quality reservoir property due to abundance of cross bedding, higher clay content, less pore areas formed by secondary dissolution, low permeability (0.1-10 mD) and porosity (6-12%). Lithofacies B sandstones have better reservoir properties than Lithofacies A due to fewer clay content, large pore throat, high permeability (16-104 mD) and porosity (15-24%). According to thisstudyhydrocarbons come from Hamitabat Formation Lithofacies B sandstones in the Thrace Basin. Mid part (Lithofacies B) of the Hamitabat Formation submarine fan sandstones have higher hydrocarbon potential than its upper part (Lithofacies A) [ABSTRACT FROM AUTHOR]