Relations between groundwater content and lithology of the Lower Permian sediments within Orchykivska Depression of the Dnipro-Donets Depression has been studied. Groundwater is characterized by considerable variety of salinity, macro- and microcomponents content. The main factor of this diversity is the presence of thick strata of the Lower Permian and Upper Devoniant saltbearing rock mass. On determining these hydrochemical «anomalies» formation mechanisms, the evaluation of ground water dynamics and orientation of physical-chemical processes in the «rock-water» system is of fundamental importance. In this regard, maps of salinity izopahits, Na/Cl ratios and other hydrological characteristics of groundwater have been created. Based on analysis of the maps and lithological and paleohydrological data the conditions of groundwater chemical composition in area and in cross-section has been determined as different. On the basis of the constructed maps of the Na/Cl ratio distribution, genetic type’s zones of origin, mixed and leaching brines have been distinguished.

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