REE distribution in the resin-asphaltene fractions as a geochemical criterion for identification of sources of trace elements in oil |
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| Authors: | S F Vinokurov R P Gottikh B I Pisotsky |
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| Institution: | 1.Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry,Russian Academy of Sciences,Moscow,Russia;2.All-Russia Institute of the Geological, Geophysical, and Geochemical Systems,Moscow,Russia;3.Institute of Oil and Gas Problems,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | This paper reports REE data on resin-asphaltene components of oil from six oil-gas-bearing provinces and on bitumoids from
inferred oil-source rocks (domanikites and bazhenites). It was shown that, regardless of geological-tectonic structure of
the regions, oil composition, depth of reservoirs, and host lithologies, oil exhibits significant REE fractionation, and,
unlike bitumoids, positive Eu anomaly. The (Eu/Sm)n ratio increases from asphaltenes to resins and further to oils. Based on REE distribution in oil, source rocks, and bitumoids,
it was concluded that deep-seated fluids were one of the possible sources that defined the trace element composition of oil. |
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