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针对我国江汉盆地深部含水层的基础地质和水文地质条件,运用国际先进的反应溶质运移数值模拟软件TOUGHRE-ACT建立垂向一维模型,探索研究了CO2进入盖层后,CO2-水-岩相互作用对盖层渗透率的影响。模拟结果表明,CO2进入盖层后,会使pH值降低,导致矿物组分和渗透率的变化。模拟5 000a后,盖层底部和顶部渗透率分别增加了10%和6.7%,主要是由石膏在该处的溶解以及菱镁矿未能沉淀造成的;盖层中部渗透率降低了约6.7%,主要是因为铁白云石和菱镁矿在后期发生了沉淀;绿泥石的溶解为铁白云石和菱镁矿的沉淀提供了必要的Mg2+和Fe2+离子来源,对盖层渗透率的变化起到了至关重要的作用。
Aiming at the basic geologic and hydrogeological conditions of the deep aquifer in Jianghan Basin in China, a vertical one-dimensional model was established by TOUGHRE-ACT, an internationally advanced reaction solute transport numerical simulation software. The CO2-water-rock Effect of Interaction on Caprock Permeability. The simulation results show that when CO2 enters the caprock, the pH value will decrease, resulting in the change of mineral composition and permeability. After simulating 5 000 a, the permeability at the bottom and top of caprocks increased by 10% and 6.7%, respectively, mainly due to the dissolution of gypsum and the failure of magnesite to precipitate. The permeability in the middle of caprock decreased by about 6.7% , Mainly due to the precipitation of iron dolomite and magnesite at later stages; the dissolution of chlorite provided the necessary source of Mg2 + and Fe2 + ions for the precipitation of iron dolomite and magnesite, and changed the permeability of cap rocks to Important role.