| 黑色页岩水岩化学作用实验研究 |
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| 关键词:black shale pyrite oxidation water-rock chemical interaction flow-through experiment kinetic rate |
| 基金项目:国家自然科学基金项目“黑色岩层黏土化过程的硫化矿物氧化动力学机理研究”(编号: 41172261);四川省科技支撑计划项目“黑色岩层酸性弱化与边坡修复技术研究”(编号: 2012SZ0051);中央高校基本科研业务费专项资金资助项目(编号: 2682014BR013) |
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| 摘要: |
| Experimental Study of the Water-rock Chemical Reaction in Black Shale |
| Being an important form of chemical weathering of black shales, the water-rock interaction is closely related to the mineral compositions, engineering properties and geological environments. A China-designed flow-through experiment was used to study the oxidation kinetic behavior of pyrite contained in black shale during the water-rock interaction. The ion concentrations of outflow solutions were measured by the ion analyzer and inductively coupled plasma mass spectrometry. The micro-features of the rock sample before and after the experiment were observed with a scanning electron microscope. Combined with the changes of rock permeability, the kinetic rate of pyrite oxidation and Si release in acid water were examined. The results obtained by the authors indicated that the behavior of pyrite oxidation caused the decrease of the rock permeability by 70%, and the oxidizing reaction coefficient of pyrite embedded in rocks under the effects of mineralogical and chemical compositions and petrophysical properties of the black shale was consistent with that of free pyrite grains reported by previous researchers. Besides, the quartz and illite were dissolved in the acidic solution produced by pyrite oxidation. Due to their uncertain content, the release rate of Si only represented their total dissolution rate. |
| WU Xi-yong,LIAO Xin,ZHAO Si-yuan,LING Si-xiang,ZHU Bao-long.2014.Experimental Study of the Water-rock Chemical Reaction in Black Shale[J].Acta Geoscientica Sinica,35(5):573-581. |
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