本研究使用砂岩樣品模擬二氧化碳地質封存實驗，探討砂岩及地層水之化學性質及礦物相變化。評估二氧化碳地質封存後，儲存層（砂岩）與地層水間相互反應後有毒微量元素是否釋出於地層水中，而對地下水水質造成影響。砂岩主要礦物組成為石英（Quartz）、微斜長石（Microcline）、鈉長石（Albite）、伊萊石-蒙脫石（Illite - montmorillonite）、斜綠泥石（Clinochlore）、白雲母（Muscovite）等，經砂岩-水-超臨界二氧化碳相互反應後，由SEM / EDS儀器發現有矽酸鹽類礦物及硫化鐵（FeS）等次生礦物生成。實驗結果顯示砂岩加入含有鹽度26.3 ‰模擬之地層水與超臨界二氧化碳反應後，其中砂岩於浸泡40天及反應20天後之Cd濃度（63.4 μg/L）及Pb濃度（627 μg/L）超出國家主要飲用水標準（Cd為5 μg/L、Pb為15 μg/L）；浸泡10、20、30、40天後，以及浸泡40天後反應20、80天後之Mn濃度分別為226 μg/L、201 μg/L、393 μg/L、75.6 μg/L、85.9 μg/L、113 μg/L超出國家二級飲用水標準（Mn為50 μg/L）。然而，砂岩加入未含有鹽度之模擬地層水與超臨界二氧化碳反應後，其中砂岩於浸泡40天後及反應20天後之Cd濃度（32.2 μg/L）及Pb濃度（85.3 μg/L）超出國家主要飲用水標準（Cd為5 μg/L、Pb為15 μg/L）；浸泡10、20、40天後，以及浸泡40天後反應20、80天後之Mn濃度分別為202 μg/L、284 μg/L、92.1 μg/L、50.0 μg/L、67.7 μg/L超出國家二級飲用水標準（Mn為50 μg/L）。

This research aims at understanding the effects of chemical characteristics and mineral facies of sandstone and formation water from the simulation experiments of rock-water- supercritical CO2 interaction. This is to assess if the toxic trace elements can be dissolved and released into formation water from sandstone in the CO2 storage layer after CO2 geological sequastration, resulting in affecting of groundwater quality. The experimental results revealed that the concentrations of Cd and Pb in water exceed the national drinking primary standard as a result of sandstone- 26.3 ‰ salinity water- supercritical CO2 interaction after 40 d of sandstone immersion and 20 d of interaction. In addition, Mn concentration exceed the national drinking secondary standard after 40 d of sandstone immersion and 20 d and 80 d of interaction. Similarly, the concentrations of Cd and Pb in water exceed the national drinking primary standard and those of Mn in water exceed the national drinking secondary standard as a result of sandstone - salinity water- supercritical CO2 interaction after 40 d of sandstone immersion and 20 d and 80 d of interaction.

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