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PETROLEUM HYDROCARBONS: GEOCHEMICAL PARAMETERS AND "COMPOSITION-OIL ORIGIN" CORRELATIONS
Abstract
In 2018, the Cassini spacecraft discovered macromolecular (above 200 atomic mass units) petroleum-like organic compounds from the depths of Enceladus, a moon of Saturn. This breakthroug requires revision of the traditional geochemical correlations "composition-oil origin" according to the biogenic theory. We studied the hydrocarbon composition variations in oil samples and their change over time in the consistency of recovered oil during well exploitation on the territory of the Khanty-Mansiysk Autonomous Okrug (Western Siberia) by GC/MS. Quantitative geochemical parameters (indices) were calculated from the relative isomer concentrations of saturated and aromatic substances, including the biomarkers. If we use the geochemical indices values for the oil samples classification, it turns out to be that the oil neighboring wells from the same productive horizon should have different forms of original organic matter and differ in the geophysical conditions of oil formation. It was shown that the technogenic stage in the evolution of the oil system, started by drilling of oil reservoir and oil recovery process, has more significant effect on the isomeric composition of petroleum substances. It happens despite on the much shorter duration of technogenic stage compared with the time of formation of oil deposits and reservoir filling. Composition variations of different oil deposits in the studied area showed that the relative contents of isomers and classes of substances have a single-mode normal distribution. It is interpreted as the predominant influence of technogenic factors and the technogenic stage of the oil system evolution on the extracted oil composition compared with the geochemical processes according to biogenic theory.
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