Groundwater age and its application for evaluating the sealing capability of aquifer
In view of various current problems including the mixly used concepts of groundwater age and groundwater residence time,the lack of basis for groundwater age classification,and complex and various groundwater dating methods,in this paper,we have given strict definitions of groundwater age and groundwater residence time,have carried out a reasonable classification of groundwater ages based on the consideration of factors including the dating ranges of different groundwater dating methods and the influence degrees of groundwater by human activities,have summarized existed groundwater dating methods including the physical hydrodynamic simulation calculation method and the chemical tracer method,and have pointed out main existed problems of different dating tracers and the selection principles of different dating methods.Taking the Ordos Plateau as an example,we have evaluated the sealing capbilities of aquifers in the area by using the groundwater dating ages,and have proposed the groundwater age standard(＞30,000 years)for the site selection of CO2 geological storage project.The evaluation results show that,except the recharge and discharge areas,the strata below the Cretaceous strata in the central Ordos Plateau meet the requirements of CO2 phase and most areas with continuous covering layer meet the safety requirements of CO2 geological storage.
万方数据
维普
