Influence of groundwater extraction on rock filtration properties in the territory of the Latitudinal Ob region

   The problem of groundwater protection in areas, where oil and gas production is taking place, is especially important today. The article focuses on the impact of groundwater extraction on the state of the filtration medium in small water bodies. Studies including hydrodynamic testing (cluster pumping) were being carrying out from 9 years at the same site. As a result of three exper-iments, experimental data were obtained, and then were interpreted in the framework of the Hantush model. The parameters of the aquifer are determined: coefficient of water conductivity and pressure conductivity factor, overflow factor, overflow coefficient. The article gives an analysis of changes in reservoir parameters. As a result, it was found that the long-term operation of ground-water in small water bodies also leads to an improvement in the state of the filtration medium, as well as in large deposits of fresh groundwater. It should be emphasized that in conditions of continuous extraction of groundwater the subsoil user should pay special attention to groundwater monitoring, namely, hydrodynamic studies, the results of which determine the hydrogeological parameters of the reservoir, and their changes indicate the state of the filtration medium.