Regional regular variations in resin and asphaltene contents in Eurasian oils were studied using a petroleum chemistry database. Oils with high contents of resins and asphaltenes occur in western Eurasia, and oils with their low contents, in eastern Eurasia. We studied oil distribution by resin and asphaltene contents over 24 stratigraphic units and have established a cyclic character of changes in these contents depending on the age of reservoir rocks. The cycling is hypothesized to be related to the geotectonic cycles in the Earth’s geologic history.
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