Historical and geochemical outlines of the oil occurence and production near Miková village; Flysch Belt, NE Slovakia

摘要

Petroleum geological field research since the 2nd half of the 19th century has revealed the presence of hydrocarbons in the Western Carpathian Flysch Belt, especially in the Galicia area of the former Austro-Hungarian Empire. Historical prospecting and exploration in this part of the Flysch belt are well documented, and revival in hydrocarbon exploration interest at the end of the 20th century led to drilling the new Alexander 1 well which supplied a non-commercial methane inflow and only traces of crude oil in form of impregnations. The chemical and isotopic composition of this methane carbon indicates methane associated with oil generation conditions. Oil is genetically related most probably to Upper Eocene to Oligocene source rocks, mainly Krosno-Menilite beds, activated after Oligocene period by thrusting of flysch formations. The geochemical characteristics are based on low temperature extraction of oil impregnation from the Alexander 1/1065 m well core and on hexane oil extract from the oil-water emulsion at a depth of 390 m in this well.