Reservoir Geological Simulation of Mine Wastewater Storage in Ordos Basin
Effective treatment of coal mine wastewater has significant economic and environmental implications,and deep well recharge is a fast and long-term solution for mine wastewater. In order to study the uncertainty of vertical or horizontal migration of wastewater in the recharge area,based on variable density driving,water-rock chemical reactions,and variable parameter synergistic physicochemical reactions,numerical simulation methods were used to characterize and reproduce the injection and diffusion states of coal mine wastewater in the reservoir. The simulation results indicate that during the injection stage,the main driving force is the pressure difference between saltwater and formation water. In the post injection stage,density difference dominates. The main geochemical reaction process is the precipitation reaction of secondary mineral anhydrite,which leads to a decrease in reservoir permeability. Among them,the concentration of the injected material mainly affects the permeability of the reservoir by influencing the degree of water-rock interaction,resulting in a decrease of 0.17％～0.9％ in permeability. The injection rate affects the permeability of the reservoir by altering the pressure driven process,resulting in a decrease of 0.58％～2.85％ in permeability.
mining environmental pollutionmine wastewater treatmentdeep well rechargenumerical simulationOrdos
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维普
