Review of Oil and Gas Occurrences in SW Turkey

By

 Ayse Bozcu¹, Andre Poisson²

(1) Suleyman Demirel University, Isparta, Turkey (2) Univ. Paris-Sud, Paris, France

 In SW Turkey, on both side of Antalya basin, two continental micro-plates can be distinguished: The Anatolian micro-plate to the NE and Bey Daglary micro-plate to the W. These micro-plates are composed of a Paleozoic basement of Gondwana type, surrounded by Mesozoic carbonate platforms. From south to north the Bey Daglaryplatforms are made of shallow marine carbonates from Triassic time up to Cenomanian. The southern part of this carbonate platform remained under shallow marine conditions up to the Eocene. On the contrary the northern part subsided during Late Cretaceous time. In the Bey Daglary platform, occurences of organic materials are known in the Triassic and in the Early Cretaceous- Cenomanian carbonates. Rock-eval analysis indicate 0.25 to 1.46 total organic carbon (TOC). These facies could have represented a source rock for oil and gas. In the same area the uncomformable Early Miocene carbonates are made of bioclastic calcarenites. In some areas these calcarenites are dark coloured and they contain oil. These carbonates represent a reservoir rock The Anatolian micro- plate is also composed of shallow marine carbonates from Triassic time up to Eocene. Organic materials are known in the Akkuyu formation Late Jurassic in age. According to organic geochemical characteristics, this unit is a good source rock. The total organic carbon (TOC) content of this unit is up to 12%. In the same area other occurences of oil and gas are known in two locations, Cyraly to the SW of Antalya Bay and the Kyzyldag to the NE of Antalya. The Cyraly location is known since the ancient civilisations as Chimera. Gas of this area is pouring out from a complex tectonic imbricate structure including ultrabasic rocks. The source rock and the reservoir are poorly known. The Kyzyldag is a large klippen of peridotites in the Antalya nappes complex. Liquid petroleum seepage is observed in this ophiolitic unit.