O2流体对岩屑长石砂岩的改造作用实验研究

he reformation of debris-arkosic sandstone by the CO2 fluid is researched at different temperature and pressures by interaction experiments of the CO2/H2O/sandstone system in inclosed container. The results of the total mineralization degree of reaction liquid, the loss of sample weight after reaction and Scanning Electronic Microscope (SEM), indicate that the corrosion intensity of felspar, calcite and quartz gradually enhance with the temperature increasing, the corrosion of sandstone dissolved by CO2 has positive correlation to the temperature. At the same time, the observation of SEM find that a kind of unknown silicate mineral generates on the surface of sample at 200 ℃and 300 ℃, and the genesis of this new mineral is explaned by the pH of reaction liquid and the variation of ionic density.