二氧化碳在深部盐水层中溶解封存规律的研究进展

将二氧化碳埋存到深部盐水层中是目前缓解温室效应的可行性对策之一，在评价储层理论埋存量时，溶解封存量在总埋存量中占有很大的比例。本文通过对相关文献的调研，计算对比了Duan&Sun模型模拟数据与前人实验数据的误差，根据前人实验与本文模拟数据分析了二氧化碳在盐水层中溶解的动力过程和热力过程，二氧化碳通过扩散作用溶解到盐水中，引起盐水层密度的变化，计算系统瑞利数满足对流运动发生的基本条件后，系统产生对流，这有利于二氧化碳的溶解。分析了温度、压力和矿化度对二氧化碳溶解的影响。在前几百年内溶解缓慢易导致泄漏，低温高压、低矿化度下二氧化碳溶解度较高，小二氧化碳水滴更有利于二氧化碳封存。

Research on Dissolved Sequestration of CO2 in Deep Saline Aquifers

At present, storing CO₂ into the deep saline aquifers is one of the feasible ways to mitigate the greenhouse effect, when evaluate the reservoir’s theory sequestration, the amount of dissolved sequestration account for a large proportion of the total sequestration. This paper studies the kinetics and thermodynamics of CO₂ dissolution into saline aquifers by the data of previous experiments and simulation using Model Duan&Sun. The diffusion of CO₂ into underlying formation waters will increase the density of saline water, we can know whether convection is happening by judging with Rayleigh number, and which is conducive to the dissolution of CO₂. This paper also studies the effect of temperature, pressure and salinity on dissolution. The process of dissolution is slowly in the first few hundred years, at which leakage is easy to happen. Low temperature, high pressure and low brine salinity is more conducive to the dissolution of CO₂. Small droplets are more benefit for CO₂ sequestration.