RESEARCH OF THE THCM COUPLING MODEING THEL CONSIDER PRESSURE SOLUTION

Pressure solution plays an important role in the evolution of rock pores and fractures. The porosity and fissure of rock play a decisive role in CO2 storage and migration. In this paper, based on the multifield coupled numerical simulation program TOUGHREACT-FLAC3D,an additional module considering pressure solution is added. And the theoretical model of one-dimensional laboratory scale is established to explore the effect of pressure solution on CO2 sequestration. This paper is based on pressure-solubilization. The coupling model of limestone THCM is established. The study found that:In the presence of CO2,Pressure solubilization can promote the change of rock porosity, and the effect of pressure solution on porosity is about 20% of the total change of porosity. In mechanics, pressure solution increases the strain rate of rock by about 10%.In terms of mineral evolution, the concentration of calcium increases by about 1/1000,The mineral content is reduced by about 1/1000. The innovation of this paper is on the original coupling calculation module. The calculation module considering pressure solution is added. Based on the previous work, a reasonable and effective simulation experiment is carried out and a quantitative conclusion is drawn.