Framework petrography and provenance studies on the Upper Cretaceous to Middle-Upper Eocene sandstones of the Eregli-Ulukışla Basin in the Central Anatolian Province of Turkey indicate that the sediments are generally derived from recycled orogenic sources and fold-thrust belt fields. The total amount of clay matrix and calcite cement is about 25% of the rock composition. The average porosity values range from 1.96 (for Çiftehan formation) to 3.80 (for Hasangazi formation). Permeability values of less than 1 mD (0.11 mD for Çiftehan, 0.07 mD for Halkalı, and 0.37 mD for Hasangazi samples) indicate that those sandstones display poor reservoir quality.
Triassic–Middle Eocene sedimentary sequences in the Central Taurids contain sufficient organic matter to constitute potential source rocks. Geochemical data are used to examine the amount, type and maturation of organic matter and the hydrocarbon potentials of the Triassic Tarasci Fm Limestone, the Late Jurassic–Early Cretaceous Akkuyu Fm limestones and shales and the Middle Eocene Gumusdamla Fm shales. During the extensive Senonian and Lutetian horizontal movements, sub-thrust units of these formations attained higher maturity values in the north (Seydisehir) than in the south (Akkuyu) of the study area. The TOC, S
2
, and HI values decrease with increasing thermal maturity (365–569°C). Therefore, the geochemical data indicate that the formations are gas and oil source rocks and may produce gas with some oil.
Samples collected from the bituminous shales in the Eocene Tokmaklar formation are the material of this study. Distribution of organic material and trace metals in the shale samples and their concentration levels and correlations were evaluated. Organic carbon content of the bituminous shales is between 0.59 and 15.89% (averaging as 4.86%). The type of organic material is 100% amorphous material (kerogen type is Type I and Type II) and it has a potential to produce oil. Trace metal enrichment levels were determined on the basis of average shale concentration in the earth crust. These levels are divided into two groups. Mo (1.98-2.64), Cu (1.27), As (1.59-8.83), and Sr (2.58-2.75) in bituminous rocks show enrichment character while Pb, Zn, Ba, and Co metals do not display any enrichment. Moreover, comparison with the average values of these metals in seawater and living organisms yield enrichment coefficients of 86.17-386.000 (with respect to seawater) and 4.59-1,723.5 (with respect to living organisms).
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