Oil – oil correlation in the oil fields from the Czech Republic

Káňa, Štěpán – stepan.kana@skaut.cz – 1,4
Geršlová, Eva – 2
Sachsenhofer, Reinhard – 3
Opletal, Vladimír - 4

1 Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
2 Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, 611 37
Brno, Czech Republic,
3 Petroleum Geology, Montanuniversität Leoben, Peter-Tunner-Straße 5, 8700 Leoben, Austria
4 MND a.s. Úprkova 807/6,695 01 Hodonín, Czech Republic


Reservoir rocks with economically relevant oil and gas accumulations in the SE part of the Bohemian
Massif occur in the autochthonous clastic and carbonate formations as well as in fractured
crystalline basement. The main aim of our research was to define oil families and influence of
secondary processes on oils occurring in the study area. To reach that goal, the results of oil
analyses of sulfur content, vanadium and nickel concentrations, GC-FID and GC–MS analyses and
stable carbon isotope composition of oil were determined.

There are two groups of oil families present within the studied group. Age-related biomarkers and
geological considerations are showing that the first group of oils was sourced by Jurassic rocks,
the second one appears to be a mixture of two sources, namely the Jurassic and Tertiary rocks
(Paleogene and Oligocene). All of the oils in the study have a value of the C29/C30 hopane ratio
near 0.5 so the source rocks are most probably shales or marls. The thermal maturity of the oils
varies within Early Oil to Middle Oil Window.


Keywords: oil-oil correlation, biomarkers, Bohemian Massif,