Although a number of significant oil and gas discoveries have been made within the Western Black Sea and the surrounding area, only sparse data about migration mechanisms are available. In this paper, biomarker and isotope data from five oilfields and one oil show located offshore Bulgaria and Romania (in the western Black Sea), and from one field onshore Georgia (at the margin of the eastern Black Sea), were compared with geochemical data from potential source rock intervals from borehole samples. The source rock data came from offshore Bulgaria and outcrop samples from onshore Georgia. The biomarker data indicates that all the oils analysed were generated by source rocks of Late Cretaceous or Cenozoic age. In the Western Black Sea sub‐basin, the most likely source rocks are Oligocene to Lower Miocene shales of the Maikop Group. Compound‐specific isotope data indicate that Lower Oligocene source rocks are the most significant although a contribution by Lower Miocene diatom‐rich source rocks cannot be excluded. For an oil sample from the Shromisubani field onshore Georgia, isotope data from individual n‐alkanes together with biomarker data indicates that the oil contains a mixture of hydrocarbons generated from the Middle Eocene Kuma Formation and the Oligocene part of the Maikop Group.

中文翻译：

---

黑海中的石油收费和迁移：石油和烃源岩地球化学的启示

尽管在西黑海及其周围地区已发现了许多重要的油气发现，但仅可获得有关迁移机制的稀疏数据。本文将来自保加利亚和罗马尼亚近海（位于黑海西部）的五个油田和一个油展以及来自乔治亚州近海（位于黑海东部的边缘）的一个油田的生物标志物和同位素数据与地球化学数据进行了比较。来自钻孔样品的潜在源岩层段。原始岩石数据来自保加利亚近海，来自乔治亚州沿海的露头样本。生物标记数据表明，所有分析的油都是由晚白垩纪或新生代的烃源岩产生的。在黑海西部盆地，最有可能的烃源岩是迈科普组的渐新世至下中新世页岩。特定化合物的同位素数据表明，尽管不能排除下中新世富硅藻的烃源岩的贡献，但下渐新世烃源岩是最重要的。对于来自佐治亚州陆上Shromisubani油田的油样，来自各个正构烷烃的同位素数据以及生物标记数据表明，该油包含由中始新世库玛组和Maikop组渐新世部分生成的烃的混合物。