Key words: licensed sites, hydrocarbons deposits, river basins, ecological condition of surface waters and bed deposits, ecological monitor
The hydrocarbons extraction always influences all the components of nature on the territories of oilfields. In the territory of Middle Ob where the great marshiness is presented the greater influence is made on the water resources. This leads not only to the changes of natural water quality but to the lives of the water inhabitants. All changes are recorded and are based on the results of regular ecological monitors.
