Numerical method and system for simulating CO2-water-rock physical and chemical action under formation condition

The invention relates to a numerical method and system for simulating a CO2-water-rock physical and chemical effect under a formation condition, and the method comprises the steps: carrying out the grid division of an established salt water layer model, and obtaining a CO2 salt water layer storage model; establishing a temperature field, a flow field and a chemical field of the CO2 salt water layer sealing model; establishing a stress field for the model, setting the lower boundary of the model and an injection point as fixed displacement boundaries, and applying maximum and minimum horizontal principal stresses to the periphery of the model to obtain a stress field of the CO2 salt water layer storage model; coupling the temperature field analysis parameter, the flow field analysis parameter, the chemical field analysis parameter and the stress field analysis parameter to obtain a macroscopic multi-field coupling model; and setting an injection rate value for an injection point through a macroscopic multi-fie