Crude oil of Kamchatka – a perspective object for geochemical research

UDK: 553.98.550.4
DOI: 10.24887/0028-2448-2021-1-18-22
Key words: Kamchatka Peninsula, Uzon Caldera, trace elements, correlation coefficients, hydrocarbons, organic matter, oil, thermal waters
Authors: S.A. Punanova (Oil and Gas Research Institute of RAS, RF, Moscow), M.B. Rodkin (Oil and Gas Research Institute of RAS, RF, Moscow; Institute of Earthquake Prediction Theory and Mathematical Geophysics of RAS, RF, Moscow)

A set of data on the trace element (TE) composition of oils from sedimentary basins of Kamchatka, oil outcrops of the Uzon volcano caldera, thermal springs and caldera lakes is analyzed. The correlation coefficients between the TE composition of these samples with the typical TE compositions of oil and other caustobioliths, biota, the Upper, Middle and the Lower continental crust are compared. Besides the general similarity of the compositions of the TE oils of the Uzon caldera and the basin oils of Kamchatka, a division of these oils into two groups was noted. The oils of the Uzon caldera and those closely associated with this zone differ from other basin oils of Kamchatka. The general specific feature of the TE composition of Kamchatka oils and thermal waters of the Uzon caldera is emphasized. In contrast to the average TE composition of oil and for oils from different oil and gas bearing basins of Russia, as well as for a number of oil samples from the giant Romashkinskoye field and its satellites and for oils of Shaim region of Western Siberia, the TE composition of oils from Kamchatka, the Uzon caldera, and thermal waters have a maximum correlation with the chemical composition of the Upper or Middle crust, whereas in all other cases the maximum correlation takes place with the chemical content of the Lower continental crust. This difference is interpreted within the framework of the model of the removal of oil components by an upward flow of young low-mineralized waters being of dehydration products. Under conditions of higher deep temperatures in Kamchatka, dehydration reactions occur at shallower depths, and the fluid flow bears a mark of shallower horizons of the Earth's crust. Physicochemical properties and hydrocarbon composition of Kamchatka oils: low content of V and Ni – less than 10 ppm, and nickel metallogeny (V/Ni<1) indicate that these oils belong to the class of early catagenetic fluids, which are formed from an organic matter in zones of late protocatagenesis or early mesocatagenesis and are stored in complex traps of a combined type.


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