The article provides data on the geochemical properties of the fields officially recognized as medicinal crude oils in Croatia and Naftalan, Azerbaijan. Studies of hydrocarbon, biomarker and microelement compositions were carried out using the following methods: chromatography-mass spectrometry, mass spectroscopy with inductively coupled plasma, and the combined thermal analysis. Determination of the potential fractional composition of oil was carried out using a synchronous thermal analyzer and showed that medicinal Naftalan and Croatian medicinal crude oil have a similar fractional composition. The hydrocarbon composition and biomarkers analyses – determination of steranes, hopanes and adamantanes in the studied oils – was accomplished on a Clarus 680 Perkin-Elmer chromatography-mass spectrometer. It was defined that the medicinal and fuel oils of Naftalan differ significantly in hydrocarbon composition, while compared with the Croatian medicinal crude oil, the medicinal Naftalan oil is almost identical in hydrocarbon composition and biomarker-geochemical parameters. Using the ICP method, microelement data on the composition of the Croatian medicinal crude oil and the medicinal Naftalan oil was obtained; both of studied oils are of the ferruginous type. The Naftalan medicinal oil quantitatively exceeds the Croatian medicinal crude oil in terms of microelement content. Despite the difference in the genesis and geological structure of the medicinal oil fields in Croatia and Naftalan, Azerbaijan, the study of their hydrocarbon, biomarker and microelement compositions showed undoubted similarity. It can be suggested that the organic matter (OM) involved in the formation of the oils have almost the same origin.
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Guliev et al. (2024) studied this question.
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