The Upper Cretaceous rocks of SE Anatolia produce over 90 percent of the Turkish oil output. They are in ascending order the Cenomanian Derdere, Coniacian-Santonian Karababa, Campanian Beloka, and Late Maestrichtian Garzan and Lower Sinan Formations as carbonate reservoirs and the Early Campanian Karabogaz Formation as an organic-rich potential source rock (Figure 1). The purpose of this study is to define the reservoir and source characteristics of the Upper Cretaceous carbonate rocks and to correlate the oils from these reservoirs with their possible sources. Toward this goal, geological, petrophysical, and geochemical studies were carried out.


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