The Origin Of Hydrocarbon Accumulation In Precambrian Of The Eastern Siberia | 42491
Journal of Earth Science & Climatic Change
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Petroleum in Precambrian deposits, including giant oil and gas fields are discovered in many parts of the world. In East Siberia, the
major petroleum occurrences are related to Lena-Tunguska petroleum province, where the total reserves of gas are estimated to be
about 6-7 trillion m3, and that of oil are about 1 billion tons. The most prominent feature of the Precambrian oil is its unusual carbon
isotope composition, which varies in the range of the δ13C-values between -32 and -37‰, while the majority of world's oils occurring
in Fanerozoic deposits are characterized by the δ13C-values from -27 to -29‰. Chemical composition of the Siberian Proterozoic
oils is also distinctive. The peculiar hydrocarbon chemistry and unusual carbon isotope composition are characteristic of many
Precambrian oils in the world. We show that geochemical specificity of the Precambrian oil is related to their origin predominantly
from bacterial material, and bacterial kingdom proliferates in periods of intensive volcanism that may explain correlation of oil
occurrences in Precambrian with times of active volcanism. We observed two types of Precambrian gases in East Siberia. The first type
is gas generated from kerogen at the late stage of its catagenesis. The East Siberian gases with δ13C-values from -28 to -32‰ may have
such origin. The other type of gas, which δ13C-values from -35 to -43‰ originates from destruction of high molecular hydrocarbons
at the end of the “oil window’ stage, when formation of gas-condensate begins. We believe that petroleum in Precambrian is most
likely to be secondary product of destruction of the initial oil deposits.
Erik Mikhailovich Galimov is presently the Director of the V.I.Vernadsky Institute of Geochemistry and Analytical Chemistry and Analytical Chemistry of Russian Academу of Sciences, Russia. He is graduated from Gubkin University in Moscow in 1959. He is also the Honored Professor at the Moscow State University, Russia. He was the President of International Association Geochemistry and Cosmochemistry during 2000-2004 and the Vice-President of IAGC during 1996-2000.