Representative sandstone samples from Mesohellenic Trough (NW Greece) were selected to investigate the geochemical reactions that occur when they come in contact with CO₂ under representative in-situ conditions (T = 70 °C, P = 150 bar, 6 months reaction in batch experiments). Those sandstones consisted of predominant calcite and quartz, with lesser amounts of feldspars, chlorite, ankerite, dolomite, kaolinite, montmorillonite and muscovite. After reaction with CO₂, the brine became acidic and was enriched in cations as a result of mineral dissolution. Minor mineralogical changes were observed that involved: a) the dissolution of carbonate minerals and b) the incongruent dissolution of chlorite to form clays and silica. The results related to these, have been linked with geochemical modelling using the PHREEQC code. Simulation results for a 10 ka time period predicted that chlorite was expected to dissolve completely within 100 years, leading to boehmite growth and increasing the mass of dolomite. Feldspars were expected to react at a later stage in the reaction sequence. Sensitivity tests were run to access the effect of various adjustable parameters on the outcome results. The geochemical experiments and modelling lend support to the view that Pentalofos and Tsotyli sandstone formations of the Mesohellenic Trough are suitable for the long-term storage of CO₂ produced in the neighbouring lignite-fired power plants, at least in terms of mineralogy and geochemistry.

选择了Mesohellenic Trough（希腊西北部）的代表性砂岩样品，以研究当它们在代表性的原位条件下（T = 70°C，P = 150 bar，分批反应6个月）与CO ₂接触时发生的地球化学反应。实验）。这些砂岩由方解石和石英为主，少量的长石，绿泥石，铁矿，白云石，高岭石，蒙脱石和白云母。与CO ₂反应后，由于矿物溶解，盐水变成酸性并富含阳离子。观察到较小的矿物学变化，涉及：a）碳酸盐矿物的溶解和b）亚氯酸盐的不相容溶解，形成粘土和二氧化硅。与这些结果相关的结果已使用PHREEQC代码与地球化学建模相关联。10 ka时间段的模拟结果预测，亚氯酸盐有望在100年内完全溶解，从而导致勃姆石的生长并增加白云石的质量。期望长石在反应顺序的稍后阶段反应。运行敏感性测试以获取各种可调参数对结果结果的影响。₂至少在矿物学和地球化学方面在邻近的褐煤发电厂生产。