温度及CO_2对方解石溶解速率影响特征分析

Characteristics analysis of impact of temperature and CO_2 on dissolved rate of calcite

为了研究地下热水对方解石的侵蚀作用,应用美国联邦地质调查局开发的水化学模拟软件Phreeqc对在不同CO2分压下,不同温度、不同时间段溶液中的方解石的溶解速率进行了水化学模拟。结果表明:在开放状态下,CO2分压为10-4.5MPa时,方解石的溶解溶解速率随着时间的推移逐渐减小;方解石的溶解速率随温度的升高而上升。流动速度较大的地下热水CO2分压越大,温度越高对方解石的侵蚀能力越大。

In order to research the erosion effect of underground hot water on limestone, the paper applied water chemical simulation software ＇ phreeqc＇ of the federal geological survey to carry out water chemical simulation to the dissolved rate of calcite in different breach pressure of CO2 points , temperature and peri- od of solution. The simulation results show that under the open state, CO2 pressure points is 10-4.5 MPa, the dissolved rate decreases with the passage of time ; the rate increases with the rise of temperature. The greater the pressure of CO2 points of underground hot water, the higher the temperature, the more the e- rosion ability of limestone.