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 which had been victorious in the First Balkan War. France occupied the area at the end of the First World War, following the defeat of Bulgaria, and it passed into Greek hands under the Treaty of Sèvres in August 1920. Under a protocol of the same year, the Turks of Western Thrace were exempted from the 1922-1923 exchange of populations agreement between Greece and Turkey and were granted rights within the framework of the Lausanne Treaty. However, since 1923, between 300,000 and 400,000 Turks have left Western Thrace most of which have immigrated to Turkey. It should be emphasised that