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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 (W...