In the exploration and production of oil and natural gas, water sample analysis is very important, and the storage of oil and gas is often accompanied by structural water. This type of structured water generally contains high concentrations of salt, mainly composed of sodium chloride, some up to 10000mg/kg. It is of great significance for analyzing water quality in exploration, understanding and studying oilfield water, revealing the material and energy exchange characteristics between groundwater or oil storage media and oil and gas, as well as the origin and evolution of oil and gas.