中文摘要：

为了研究温度对硫酸盐溶液侵蚀石灰岩和白云岩的影响,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,不同浓度的Na2SO4和MgSO4溶液中的方解石和白云石的溶解度和温度的关系进行了化学模拟.模拟结果表明：在无CO2分压的情况下,在同浓度的盐溶液中,方解石和白云石的溶解度随着温度的升高迅速升高;在CO2分压为10-4.5MPa时,方解石和白云石的溶解度随着温度的升高而逐渐降低,然而始终大于在无CO2分压时的溶解度;在Na2SO4溶液中,方解石和白云石溶解度均大于在纯水中的溶解度;方解石在MgSO4溶液中的溶解度大于在同条件下Na2SO4溶液中的溶解度.在无CO2影响时,溶液内含有的SO24-浓度大小对石灰岩和白云岩侵蚀能力的影响,不随温度的改变而改变;温度的升高可以增强盐效应;在CO2分压为10-4.5MPa时,等温条件下能产生盐效应最强的浓度的溶液对石灰岩和白云岩的侵蚀能力最强.

英文摘要：

In order to study the influence of the temperature of sulphate solution on solubilities of limestone and dolostone,a hydrochemical modeling software, PHREEQC,developed by the U.S.Geological Survey,was used to simulate the relationship between the temperature and the solubilities of calcite and dolomite in Na2SO4 and MgSO4 solutions with different concentrations under different CO2 partial pressures.The simulation results show that the solubilities of calcite and dolomite rapidly increased with temperature in the Na2SO4 and MgSO4 solutions with the same concentration under no CO2 partial pressures.They also show that the solubilities of calcite and dolomite gradually decreased with the increase of temperature in the Na2SO4 and MgSO4 solutions with different concentrations under the CO2 partial pressure of 10-4.5 MP and were always higher than those under no CO2 partial pressures.The solubilities of both calcite and dolomite in the Na2SO4 solution were higher than those in the pure water.The solubility of calcite in the MgSO4 solution was higher than that in the Na2SO4 solution under the same conditions.When there was no CO2 partial pressure,the influence of the concentration of SO2-4 in the solution on the erosion of limestone and dolostone did not change with temperature.The increase of temperature could enhance the salt effect.When the CO2 partial pressure was 10-4.5 MP,the erosion of the solution with the concentration that can produce the best salt effect on limestone and dolostone under the isothermal condition was the most significant.