Issue: 1 , Volume: 8 , Уear of publication: 2026

The paper examines the results of long-term monitoring studies of the chemical composition of mineralized groundwater of the Aptian-Albian-Cenomanian aquifer complex at the Taylakovskoye oil field in Western Siberia. The groundwater of this complex is subject to technogenic load due to its use to maintain reservoir pressure in deposits, as well as due to the discharge of water produced with oil into the complex. The purpose of the study is to control the geochemical state of formation waters of the Aptian-Albian-Cenomanian aquifer complex. Research methods included assessment of natural geological and hydrogeological conditions and analysis of the stability of geochemical parameters of groundwater. The results of monitoring the composition of groundwater confirm the stability of the hydrochemical regime of groundwater in the Aptian-Albian-Cenomanian complex. There are no significant changes in the chemical composition, ratios of the main salt-forming components and other indicators.