Experiment geology research of carbonate dolomitization

According to the dynamic mechanisms of dissolution and preciptation of carbonate rocks,two modelling approaches for dolomitization were proposed: 1)repeated heating and cooling;2)convectional circulation.The modelling products were characterized using several different instruments.The results suggested that dolomites could be obtained by both of the two methods.Through thermodynamic analysis and experimental study,the influences of Mg/Ca concentration ratio,sulfate ion and temperature on dolomitization process were discussed.The study suggested that it was hard to obtain dolomite in the lab because of the difficulty in the growth of dolomite germ.Once the germ appeard,the growing speed of dolomite would be faster than that of calcite.This paper explained why no young age dolomite exists in the natural environment and supplied new thoughts on dolomitization research and carbonate reservoir prediction.