Origin of Hydrocarbons in the Eastern Part of the Drava Depression (Eastern Croatia)

Abstract

Oil and gas in the eastern part of the Drava depression originated from source rocks of very good generating capabilities - dark gray to black marlstones of Ottnangian, Karpathian, Badenian, Sarmatian and partly Pannonian age. During different tectonic regimes, algal-lipid rich kerogen formed in anoxic and suboxic marine environments. The typical terrestrial maceral vitrinite only occurs as traces.