【摘要】 把CO2注入深部咸水层进行埋存,是减缓温室效应的一个重要途径。CO2注入地下咸水层后咸水中析出的盐会堵塞地层孔隙而严重影响注入效率。理解析盐产生的条件、发生的过程以及盐在孔隙结构中的分布对含水层孔渗性的影响十分必要。在总结国内外CO2注入地下咸水层析盐研究现状的基础上,分析了析盐发生的条件及析盐效应,指出需要通过实验模拟和数值模拟等手段研究毛细压力、重力、黏滞力协同影响下不同的多相流动体制对析盐过程的控制,把握析盐现象的发生、分布及其对介质孔渗性的影响规律。更多还原

【Abstract】 Injection of CO2into saline aquifers is an important way to reduce the greenhouse effect.When CO2is injected into saline aquifer,precipitation of salt derived from brine blocks the pore space of formation and seriously affects the injection efficiency.It is necessary to understand the process of salt precipitation,the distribution of salt in pore structure,and the influence of salt precipitation on the porosity and permeability of aquifer.Based on previous study,this paper analyzes the conditions about where and when the salt precipitation occurred,and summarizes the effect of salt precipitation.Results suggested that salt precipitating process is controlled by the mechanism of different multiphase flow under the effect of capillary force.Further study on the effects of capillary force,gravity and viscous force by experiment and numerical simulation is necessary to understand the occurrence and distribution of salt precipitation,and its influence on the porosity and permeability of medium.更多还原