Biodegradation and migrational fractionation of oils from the Eastern Carpathians, Poland |
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| Authors: | Irena Matyasik Anna Steczko R Paul Philp |
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| Abstract: | Nineteen oil samples from Silesian Unit of the eastern Carpathian Overthrust have been characterised geochemically in order to determine the causes of compositional differences among them and elucidating the processes responsible for their differences. Some of analysed crude oils have undergone post-emplacement alteration in the reservoir such as biodegradation and evaporative fractionation. This explains much of the chemical and physical properties variability across individual fields from one tectonic unit. Geochemical correlation based on biomarker distributions showed a close relationship between all oils (included biodegraded oils). However, data based on the whole oil GC analysis of selected oils suggest that the process of evaporative fractionation may change the composition of lower molecular weight hydrocarbons of the oils in this region. This paper outlines the probable mechanisms for oil mixing in the region and describes how this can lead to observable lateral differences in the composition of oils. |
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| Keywords: | Biodegradation Biomarkers Carpathian Overthrust Evaporative fractionation Lower weight hydrocarbons |
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