STUDY OF SIMULATION EXPERIMENT FOR CARBONATE ROCKS DISSOLUTION IN BURIAL DIAGENETIC ENVIRONMENT
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摘要: 在压力不变、不同温度条件下,分别以CO2、乙酸和H2S溶液为介质,对各类碳酸盐岩的溶蚀表明,总体上灰岩最易溶,白云岩最难溶,过渡岩类处于两者之间,反映了方解石比白云石易溶的特征.在温度不变,不同压力条件下,乙酸溶液对各类碳酸盐岩的溶蚀表明,在0.2~30 MPa压力条件下,灰岩比白云岩易溶,但在50MPa压力条件下各类样品溶蚀强度明显增加,增强幅度以白云岩类最大,灰岩最小,云质灰岩介于两者之间.结合前人实验结果推测,压力继续增加时,白云岩溶蚀强度可能超过灰岩.而在相同温压条件下,以CO2溶液为介质,不同粒径的微晶灰岩样品的溶蚀表明,小粒径样品溶蚀率是大粒径样品的1.49倍,说明溶蚀作用强弱除了取决于矿物成分外,流体与矿物接触的比表面积大小是至关重要的因素.Abstract: Under the condition of the same pressure and different temperature where acetic acid,CO2 and H2S as solution,respectively,the experiments of dissolution for different type carbonate rocks have been performed the ability of dissolution of the dolostone is lower compared with the limestone.And the ability of dissolution of transitional type carbonate rocks is between limestone's and dolostone's.The results show that the ability of dissolution of dolomite is lower than calcite.Under the condition of the same temperature and different pressure where acetic acid as solution,when pressure is between 0.2 and 30MPa,the results show that the ability of dissolution of dolostone is lower than limestone.However,when pressure is 50MPa,the dissolution abilities of samples obviously increase.The increased extent is characterised that dissolution intensity of the dolostone is most large,intensity of limestones is most low and intensity of algal limestone is between dolostones and limestones.Based on previous results presumed when pressure increases,the dissolution intensity of dolostones is more than the limestone.However,the microcrystalline limestone dissolution of different particle size indicates that the dissolution rate of large particle size is 1.49 times larger than that small size.All these show that the dissolution extent depends on the main factors of specific surface area caused by contaction of fluid and minerals besides of mineral composition.
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