Hydrogeological conditions of Naryk-Ostashkin area in Erunakovo region in Kuzbass

The relevance of the research is caused by the necessity of studying groundwater composition and hydrodynamic conditions at NarykOstashkin area of Kuzbass, promising for extraction of coal methane. The main aim of the work is to characterize hydrodynamic conditions and hydrogeochemical features at Naryk-Ostashkin area, and to determine groundwater recharge and discharge conditions to provide base for hydrogeological generalization of coal bed methane mining perspective areas. The methods. Chemical composition of groundwater and surface water was studied in the Problem research hydrogeochemical laboratory (TPU), registered in the system of analytical laboratories of Gosstandart of Russia. Traditional methods were used to conduct a complete chemical analysis. Processing of experimental-filtration works was performed by the standard graphic method of interim tracking the level with further graphic constructions and computations in the software package MS Office. The results of the study allow clarifying some features of hydrogeological conditions of the Naryk-Ostashkin area. Thus, according to the results of experimental filtration work at the mouth of the river Osinovka, the authors have established the presence of hydraulic relation of groundwater of the upper hydrodynamic zone to the surface water currents, and determined the values of water supply and water level coefficients for this part of the hydrogeological section. Based on evaluation of underground and surface water interaction by the results of experimental filtration work, the real influence of boundary conditions of the I and III kind on hydrogeological well operation was established, that allows significantly updating the hydrodynamic models that can be used to justify the production of coal methane in this area. In addition, it was found out that within the massifs of slightly fractured rocks there are isolated pressure systems, the formation of which is caused by the presence of layers with low water supply in the section. The authors distinguished the zones of intensive and delayed water exchange by the nature of permeability in the hydrogeological section. Zones of fresh and brackish water correlate with hydrodynamical heterogeneity of rocks in hydrogeochemical relation.