Petroleum source rock characteristics of the lower tertiary formations in the Eregli-Ulukisla basin, southern Central Anatolia, Turkey


Sonel N., Sari A. , Demirel I. H.

PETROLEUM SCIENCE AND TECHNOLOGY, vol.26, no.4, pp.460-472, 2008 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 26 Issue: 4
  • Publication Date: 2008
  • Doi Number: 10.1080/10916460600809691
  • Title of Journal : PETROLEUM SCIENCE AND TECHNOLOGY
  • Page Numbers: pp.460-472

Abstract

Potential source rocks in the Eregli-Ulukisla basin include Campanian-Maastrichtian limestones and marls, Upper Paleocene-Lower Eocene deep-marine shales, and Middle-Upper Eocene continental slope deposits, including shales and sandstones. Organic geochemical analyses and palynofacies observations show that the organic components in Upper Paleocene-Upper Eocene sediments are mainly coaly and woody, with minor herbaceous and algal-amorphous-like organic matter, indicating that they are terrigenous (mainly Type III and Type IV kerogen). The organic carbon content of these rocks ranges from 0.04 to 0.73%, and they have marginal source rock quality for oil generation. A plot of HI versus T-max values implies that the Upper Paleocene-Lower Eocene samples are in the early stage of oil generation, while the Middle-Upper Eocene samples are thermally immature. The pristane/phytane ratio for Tertiary samples corresponds to a transition from anoxic to oxic depositional conditions.