f Organic Geochemical Evaluation of the Late Oligocene to Miocene Aged Units Around Tuzluca (Iğdır), NE Turkey

Late Oligocene aged Halıkışlak formation’s mudstones facies show very low %TOC, HI and genetic potential (GP) values (% 0.06-0.25, 14-90 and 20 to 220 ppm), respectively, though its coaly facies show high value for %TOC and GP, but immature and low HI (% 6.78, 3115 ppm, and Tmax= 4280C and HI=45). The Turabi formation (Lower Miocene) is deposited in lacustrine complex, containing of uniform mudstones show low %TOC values (between % 0.07 and 0.24); however, dark colored mudstones facies are concentrated by transition to the Cincevat formation is high (between% 0.67 and 6.14). Although values of Tmax and HI are 420-457 0C and 26-667, respectively, GP values are generally low. The Tuzluca formation (Upper Miocene) is composed of mostly halite and gypsum with intercalated variable thickness of dark colored mudstones (20-150 cm). The %TOC and GP values for mudstones of the Tuzluca formation are low (between % 0.09 and 0.39, and 120-1510 ppm), and HI-OI and HI-Tmax diagrams show that the unit comprises dominantly lacustrine material and within immature zone. According to organic geochemical data, the Halıkışlak and Tuzluca formations seems to have no hydrocarbon potential. The Turabi formation would more detailed study in well data.