Thrace Basin basement, comprises interbedded fine to coarse grained clastics from a variety of depositional environments, turbidite, muddy carbonates with local reef developments, river channels and tuffs. More than 400 wells were drilled till 2008; 14 gas and 3 oil fields were discovered and all of them are producing. Main gas productions zones are between Eocene- Oligocene deposits; Hamitabat (turbiditic sandstones), Ceylan (tuffs), Sogucak (reefal limestone), and Osmancik (deltaic sandstone) formations. Shales of Hamitabat and Mezardere formations have good source potentials. Thrace Basin The European side of Turkey is called the Thrace Basin. It is the largest and thickest Cenozoic sedimentary basin
Turks of Western Thrace regions where the majority of Muslim Turks lived. The Turkish community has a strong presence in the Komotini () and Xanthi () departments of East Macedonia and Thrace, while it is scarcely present in the Evros prefecture, the closest to the international boundary with Turkey. According to estimates, Muslims as a whole, represented 36-38% of the Rhodopi Department population, 12-24% in the Xanthi Department and less than 5% in the Evros Department. According to Ethnologue, in 1976 the Turkish language was spoken by 128,000 people in Greece, the majority of whom are located in the Western Thrace portion of the