Diadin D. Groundwater and surface water monitoring on oil-gas production areas

Thesis treats the development of scientific and methodological principles of local monitoring of groundwater and surface water on the areas of oil-gas production in order to enhance the environmental safety of oil-gas production regions of Ukraine. It has been found that on oil-gas fields of Eastern oil-gas-bearing basin of Ukraine the highest level of water contamination with produced water components are observed at operational sites of open facilities of produced fluids processing as well as systems of produced water deep injection. Environmental hazard of produced water has been found to be linked with high concentrations of such mobile substances as chloride, sodium, strontium and lithium ions. The set of indicators of natural water pollution by produced water compounds was scientifically justified and applied on the bases of hydrochemical and isotopic tools. It includes groundwater levels, temperature, conductivity, pH, redox-potential, chloride, sodium, calcium, strontium, lithium, hydrocarbons, total dissolved solids, water stable isotopes δ2H–δ18O. Scientific and methodological principles of local monitoring of groundwater and surface water were developed. They comprise justification of objectives and tasks of monitoring, sequence and frequency of observations, criteria for identification and allocation of monitoring points for different types of water, set of obligatory and optional indicators, techniques and tools for field observations and water sampling, methods of observation data processing and interpretation. Informational system supporting water monitoring commitment was developed. It combines the database block with geographical information unit for data storage and processing of water quality information. The system serves as a base for effective decision-making regarding environmental safety requirements.