Hydrocarbon Potential of Middle Jurassic Sediments (Stefanets Mb. of Etropole Fm.) from the Western Part of Balkan Orogenic System, Bulgaria

Sediments of Stefanets Mb. (Etropole Fm.), consisting mainly shale and siltstones, are investigated by Rock-Eval pyrolysis. The samples from the Middle Jurassic section (Bajocian in age), outcropping within western part Balkan orogenic system Bulgaria, were analyzed to study their hydrocarbon generative potential. obtained TOC contents range 0.69–1.97 wt.%. Inorganic carbon (TIC) total sulphur (TS) low coincide with previously published data. values S1 S2 between 0.01 0.10 (mg HC/g rock) because high thermal maturity level, as indicated Tmax 566-610 °C. rocks postmature stage consequently HI very (< 10 mg TOC). fair good quantity, quality, well level organic matter, assume minor remaining gas-prone generation potential