地质科技情报2012，Vol.31Issue(1)：115-121,7.
CO2-水-岩相互作用对盖层渗透率影响的数值模拟
Numerical Simulation of CO2-Water-Rock Interaction Impact on Caprock Permeability
摘要
Abstract
This paper, based on the basical geological and hydrogeological conditions of deep aquifers in Jianghan Basin in China, established a one-dimensional vertical model with the famous TOUGHREACT code to study the impact on permeability of caprocks induced by CO2-water-rock interaction after CO2 breaking into the caprock. The simulation results showed that CO2 breaking into the caprock reduces the pH value, and changes the mineral composition and permeability. After 5000 years of simulation time, the permeability on the bottom and top of caprock increases by 10% and 6. 7% , respectively, mainly due to the dissolution of gypsum and no precipitation of magnesite in the area. At the central of caprock, the permeability decreases by about 6. 7%, mainly due to ankerite and magnesite precipitate in the later period. The dissolution of chlorite provides Mg2+ and Fe2+ for precipitation of ankerite and magnesite, which plays a crucial role on permeability changes of the caprock.关键词
CO2-水-岩相互作用/盖层渗透率/数值模拟Key words
CO2-water-rock interaction/caprock permeability/numerical simulation分类
天文与地球科学引用本文复制引用
董建兴,李义连,杨国栋,柯怡兵,武荣华..CO2-水-岩相互作用对盖层渗透率影响的数值模拟[J].地质科技情报,2012,31(1):115-121,7.基金项目
国家自然科学基金项目(41072180) （41072180）
