Issues of the quality of associated waters of an oil field in the Aleksandrovsky oil and gas region

Managing produced water has become an increasingly important issue in Western Siberia and other oil-producing regions worldwide. The rising water content in oil production makes effective water handling and disposal more crucial than ever. This study aims to analyze changes in the hydrogeochemical conditions of the Aptian-Albian-Cenomanian hydrogeological complex at an oil field in the Alexandrovsky petroleum district of the Vasyugan petroleum province. For many years, this complex has served both as a source of reservoir water and as a disposal interval for excess produced water. The authors analyzed the geological structure and hydrogeological setting of the field, summarized production and water disposal data, and evaluated long-term changes in groundwater chemistry. This article uses hydrogeochemical monitoring data from 70 reservoir water samples. The results confirm that the reservoir waters have generally maintained characteristic hydrochemical composition. At the same time, the concentration of suspended solids has increased, and elevated levels of petroleum hydrocarbons have been intermittently recorded. These results point to the need for continued improvement of groundwater monitoring practices.

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