Experimental simulation of burial dissolution of clay-bearing carbonate

The burial dissolution process of claybearing carbonate was simulated with experiment in order to analyze the enrichment and occurrence of clay mineral. As the increase in pressure and temperature, clay mineral content increased at first and then decreased, with 80-160℃ as the turning point. Clay mineral mainly existed in crack, inclusion and residual crack. Dissolution rate increased as temperature and pressure increased, and obtained the biggest value at 160℃ and 48 MPa in experiment. The influence of clay content in carbonate on dissolution rate was not obvious, while the occurrence of clay mineral played a more important role. As dissolution continued, clay mineral delayed the increase of dissolution rate at 80-120℃; however, the influence weakened as temperature and pressure continued increasing.