Abstract
29 Oils and 12 cores (11 of Miocene age and 1 of Pretertiary age), representing some 3000 cuttings samples (of Mesozoic and Tertiary age), were investigated and correlated in order to find out whether the oils from the Croatian Subbasin of the Pannonian Basin (Sava, Drava and Slavonija-Srijem depressions) belong to the same oil generative basin. The oils were trapped in different types of reservoirs of Miocene sandstones and breccias, as well as in fractured Basement. For correlation, multiparameter approach is applied including biomarkers and isotope data. According to biomarker parameters, the oils are thought to originate from similar source(s) and could be classified in one broad group. Some biodegradition has been observed for the shallowly reservoired oils. Oils are found to differentiate regarding maturity rank. Bacterially reworked marine algal material mixed with more or less of land input and deposited in more or less suboxic environment is the probable source. Isotope data subdivide the oils into a rather spread group of the Sava trough oils and into the Drava trough oils. All the oils seem to belong most probably to Miocene source rock(s).
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