Abstract
Vanadium is one of the most abundant metals in oils and natural bitumens, with concentrations ranging from 10/sup -2/ to 1.5 x 10/sup 3/ ppm in oils and to as much as 0.6% in bitumens. Vanadium contents in some oil and bitumen deposits are comparable with those of vanadium-bearing titanomagnetite ores. The authors have examined the distributions of vanadium and associated trace elements (Ni, Mo, Co, etc.) in oils and bitumens for the Volga-Ural and Timan-Pechora basins, which are petroleum-metallogenic provinces of the vanadium-nickel type. The vanadium and nickel concentrations in the oils and bitumens, in bulk and by fractions, have been determined, without ashing the samples, by X-ray fluorescence analysis using /sup 55/Fe and /sup 238/Pu radionuclides and a semiconductor spectrometer. The ash was examined by emission spectrography and X-ray structural methods. The data reveal regularities in the vanadium concentration related to the physicochemical parameters. The authors also used previously published analyses to extend the statistical sample. 16 references.
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