Chemical composition features of the underground waters and brines in the western part of Tunguska artesian basin
By geochemical analysis fresh, brackish, salty underground waters and the brines of various salinity and different types have been shown to occur in Western Tunguska artesian basin. The salinity of them increases with depth. It is not tracing in oil and gas Vendean and Riphean sediment layers of Baykitska anteclise and Katangska saddle. The highest salinity brines occur in salt-bearing hydrogeological formation (Є). They are chloride calcium composition and rich in bromine, strontium, lithium, cesium, rubidium, chromium and other chemical elements. On the North-West territory (on the South side of Kureyska syneclise) chloride calcium brines occur on the depth of 700 m and less. They are more close to the surface then in the South sites of the region.