In the Ereğli‐Ulukıșla Basin, southern Turkey, crude oil shows have been observed in the subsurface in the shale‐dominated non‐marine Upper Miocene – Pliocene succession. Based on analyses of samples from four boreholes, the shales’ organic matter content, thermal maturity and depositional characteristics are discussed in this study. Geochemical correlations are established between shale extracts and a crude oil sampled from the shale succession. The shales have moderate to high hydrogen index (HI) and very low oxygen index (OI) values. Pyrolysis data show that the shales contain both Types I and II kerogen, and n‐alkane and biomarker distributions indicate that organic matter is dominated by algal material. Very high C₂₆/C₂₅ and C₂₄/C₂₃, and low C₂₂/C₂₁ tricyclic terpane ratios and C₃₁ R/C₃₀ hopane, C₂₉/(C₂₈+C₂₉) MA and DBT/P ratios in shale extracts indicate that deposition occurred in a lacustrine setting. High gammacerane and C₃₅ homohopane concentrations and low diasterane/sterane ratios with a very low Pr/Ph ratio suggest that both the shales and the source rocks for the oil were deposited in a highly anoxic environment in which the water column may have been thermally stratified.

中文翻译：

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土耳其中部埃里利-乌卢基拉盆地的耶尼科伊地区原油和新生代有毒页岩的生物标志地球化学

在土耳其南部的Ereğli-Ulukıșla盆地中，在以页岩为主的非海洋上中新世-上新世演替的地下发现了原油显示。在对四个钻孔样品进行分析的基础上，讨论了页岩的有机质含量，热成熟度和沉积特征。建立了页岩提取物与从页岩序列中采样的原油之间的地球化学相关性。页岩具有中等至高的氢指数（HI）和非常低的氧指数（OI）值。热解数据表明，页岩同时含有I型和II型干酪根，正构烷烃和生物标记物的分布表明，有机质以藻类物质为主。C ₂₆ / C ₂₅和C ₂₄ / C ₂₃很高，低的C ₂₂ / C ₂₁三环萜烯比率和C ₃₁ R / C ₃₀ hop烷，页岩提取物中的C ₂₉ /（C ₂₈ + C ₂₉）MA和DBT / P比表明沉积是在湖相环境中发生的。较高的γ-甘油和C _35同庚烷浓度，以及较低的Pur / Ph比的低的硬脂烷/甾烷比表明，油的页岩和烃源岩均沉积在高度缺氧的环境中，在该环境中水柱可能已经热分层了。