NEW HOMOLOGOUS SERIES OF HOPANOIDS (HYDROCARBONS – BIOMARKERS) IN OILS AND NATURAL BITUMENS OF THE NORTH-EASTERN SLOPE OF THE ALDAN ANTECLISE
Kashirtsev V.A.1,2, Zueva I.N.2, Chalaya O.N.2
1Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
2M.K. Ammosov North-Eastern Federal University, Yakutsk, Russia
Keywords: Aldan anteclise, oil, natural bitumen, hydrocarbon biomarkers.
Abstract
On the north-eastern slope of the Aldan anteclise, oil and bitumen shows with previously unknown hydrocarbon biomarkers 9-methyl, 8-14-secohopanes were encountered in the sections of hydrogeological wells. Shows of biodegraded asphaltites are confined to the cavernous horizon in the Middle Cambrian limestones of the Tanhai formation. Relatively high residual concentrations of "new" biomarkers are due to their very high resistance to biological oxidation processes. Based on the geological materials and geochemistry of the studied naphthides, it seems that in the region under consideration there is a typical oil deposit sealed in the "head" of the cavernous horizon by highly viscous bitumen.
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