Upper Visean black shales (“Rudov Beds”) of the Ukrainian Dniepr-Donets Basin (DDB)
Within my PhD project, I investigate Upper Visean black shales (“Rudov Beds”)of the Ukrainian Dniepr-Donets Basin (DDB) regarding their potential as a petroleum source rock. Work performed until now focused on two aspects, (1) Rudov Beds as a potential source for hydrocarbons trapped in conventional reservoirs and (2) their relevance as a target for unconventional (shale oil/gas) production. Both aspects need to be approached in a different way.
(1) Conventional production
To link Rudov Beds to oils, condensates and gases from producing wells, I used biomarker composition and isotope geochemistry of both source rock extracts and oils/ condensates/ gases for a correlation study (Fig. 1). Rudov Beds were then compared to other potential source rock horizons within the DDB, to estimate the most likely source for the trapped hydrocarbons. The modelled thermal history of the basin as well as structural information on producing fields was usefull to evaluate the obtained results and enhance information on the petroleum system within the DDB.
(2) Unconventional production
To assess Rudov Beds as shale gas/liquids target, I laid stress on
· Vertical and lateral distribution of the mineralogical composition
· Vertical and lateral changes in total organic carbon content and thermal maturity
· Variations in hydrocarbon generation potential throughout the basin
· Thermal evolution of organic matter (e.g. organic matter-hosted porosity), as well as lateral variations in organic matter composition
Future work will cover a 3D thermal model of the DDB. Apart from that, I try to set up a research project on nanostructures of shales and coals, focusing on organic matter-hosted porosity and trace element storage mechanisms. This project will follow up my recent work on organic matter-hosted porosity within Rudov Beds (Fig. 2) as well as a side-study that focused on the chemical composition of coals from the Donets Basin.