EAP - Oil Shale publications

PUBLISHED
SINCE 1984

Oil Shale

ISSN 1736-7492 (Electronic)
ISSN 0208-189X (Print)

Impact Factor (2022): 1.9

ORGANIC GEOCHEMICAL CHARACTERISTICS OF MIOCENE OIL SHALE DEPOSITS IN THE ESKİŞEHİR BASIN, WESTERN ANATOLIA, TURKEY; pp. 315–336

PDF | doi: 10.3176/oil.2014.4.02

Authors

İLKER ŞENGÜLER, REYHAN KARA-GÜLBAY, SADETTİN KORKMAZ

Abstract

In the Eskişehir Basin, western Turkey, oil shale occurs in alternation with claystone, siltstone, conglomerate and coal (lignite) seams in lacustrine deposits of Early-Middle Miocene age. The thickness of oil shale seams drilled during the study varies between 20 and 30 m. Organic geochemical features of the shale were evaluated using TOC, pyrolysis, GC and GC-MS analyses.
The Eskişehir oil shale is characterized by very high TOC contents (6.32–37.15 wt%), Hydrogen Index (HI = 392–777 mg HC/g TOC), Potential Yield (PY = 35.50–159.32 mg HC/g rock) and very low Oxygen Index (OI = 13–92 mg CO₂/g TOC) values. Organic matter in the studied oil shale is of Type II kerogen and shows S₂/S₃ ratio values between 5.49 and 56.79 and low T_max (421–435 °C ) and PI (0.01–0.05) values.
Low Pr/Ph ratio of oil shale (0.17–0.96) is indicative of anoxic conditions. Dominant steranes are either C₂₇or C₂₈. Normal steranes are more abundant than iso- and diasteranes and diasterane abundances as well as 20S/(20S + 20R) and bb/(bb + aa) sterane ratios are low. While oil shale samples in general have low tricyclic terpane (C₁₉–C₂₉) abundance, their C₃₀ (R + S) tricyclic terpane content is high. For all the oil shale samples studied C₂₉/C₃₀ hopane, C₃₁R homohopane/hopane and moretane/hopane ratios are high and Ts/(Ts + Tm) and C₂₉Ts/(C₂₉Ts + C₂₉H) ratios are low. 22S homohopanes are recorded in lower quantities in comparison to 22R epimers and the 22S/(22S + 22R) homohopane ratio is low.

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