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AAPG Bulletin; March 2009; v. 93; no. 3; p. 357-377; DOI: 10.1306/09290808072
© 2009 American Association of Petroleum Geologists (AAPG)
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The Korudag anticlinorium in the south Thrace Basin, northwest Turkey: A super giant petroleum trap complex?

Samil Sen1 and Selin Yillar2

1 Istanbul University, Geology Department, Avcilar Istanbul, Turkey; samilsen{at}istanbul.edu.tr
2 Istanbul University, Geology Department, Avcilar Istanbul, Turkey; syillar{at}istanbul.edu.tr

Samil Sen is an assistant professor in the Geological Engineering Department of Istanbul University, Turkey. He received his M.Sc. degree (1994) and Ph.D. (2001) from the same university. He has then worked in the Thrace Basin. His works have been supported by the Turkish Petroleum Company. His interests are in oil exploration and oil supply security in the Middle East, Caspian Sea, and Russia. His paper titled Security Concerns in the Middle East for Oil Supply: Problems and Solutions was published by Energy Policy.

Selin Yillar is a research assistant and a Ph.D. student at the Geological Engineering Department of Istanbul University, Turkey. She completed her M.Sc. degree thesis, which is related to southwest Thrace Basin sedimentology, in 2005 at the same university. She also studied basin analysis and oil exploration in the south Thrace Basin after her thesis. Her research interests are in sedimentology, sequence stratigraphy, basin analysis, and oil exploration.

ABSTRACT

The sedimentary sequence of the south Thrace Basin (northwest Turkey) comprises Upper Cretaceous–Holocene sediments. In this basin, the Korudag anticlinorium, which is the subject of this study, is located between the Aegean Sea in the west and the Sea of Marmara to the east. The anticlinorium, which is approximately 300 km (186 mi) long and 40 km (25 mi) wide, was formed by effects of the Neotethys subduction-accretion complex and Istranca massif collision during the late early Miocene. The Korudag anticlinorium was deformed to its present-day structure by the oldest splay of the North Anatolian fault (upper middle Miocene) and the northern branch of the North Anatolian fault (NAF-N) (not earlier than 200 ka). Organic geochemical analysis, oil and gas to source rock correlation, and basin modeling studies suggest that the Korudag anticlinorium should be charged by hydrocarbons generated from the Karaagaç, Ceylan (regionally), and Mezardere formations. Gas and oil are being produced from the Korudag anticlinorium and its subparallel anticlines in the north Marmara, Degirmenköy, Seymen, Çayirdere, Karaçali, Yulafli, Tekirdag, Sevindik, and Vakiflar (gas plus oil) fields. Mapping done as part of this study indicates that the Korudag anticlinorium has not yet been tested and explored comprehensively.






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