The process of oil production is accompanied by the impact on all components of natural environments: atmospheric air, soil and vegetation cover, surface waters, including bottom sediments. In the conditions of the Middle Ob region, with its high degree of swampiness and lakes, it is the bog-lacustrine ecosystems that are the most vulnerable in the course of human economic activity. This also applies to the territory of the Lyantorskoye oil and gas condensate field, developed since 1978, in the landscape structure of which lake-bog complexes occupy almost 80% of the territory. At long-term developed fields, primarily those whose exploitation began in the Soviet period, background observations of the state of natural environments, including surface water and bottom sediments, were not carried out. This gap was filled only in the post-Soviet period, and at the beginning of the 21st century, hydrochemical studies became regular with the determination of a large number of pollutants. The Lyantorskoye field, like other long-term developed fields, is also covered by annual hydrochemical studies with a large number of determined components in 10 watercourses. The results of these studies are presented in the article. As a result of the analysis of the current state of the surface waters of the Lyantorskoye field, it was established that the presence of phenols, biogenic substances, heavy metals and other chemical substances in the surface waters, the content of which exceeds the established maximum permissible concentrations. This is typical not only for the rivers of this field, but also for other watercourses in the territory of the Khanty-Mansiysk Autonomous District - Yugra, where hydrocarbon production is not carried out. The noted is associated with the natural features of the area and the processes taking place in the bowels of the earth. Analysis of the research results indicates that the long-term operation of the Lyantorskoye field did not have a visible effect on the hydrochemical state of surface waters and bottom sediments of the field's streams. The increased content of some pollutants is caused not only by technogenic factors, but by the natural features of the taiga zone of Western Siberia.
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