Density-Driven Convection in Carbon Dioxide Geological Storage: A Review
详细信息
- 责任者：Zhang Wei (Geoscience Documentation Center ; China Geological Survey ; Beijing 100083 ; China) ; Lü Peng
- 刊名：Hydrogeology and Engineering Geology
- 出版年：2013
- 卷期：40(2)
- 关键词：二氧化碳 ; carbon dioxide ; 地下储存 ; underground storage
- 页码：p.101-107
- 图表：40 refs.
- 分类号：1800
- issnNo：ISSN1000-3665
- isbnNo：CN11-2202/P
摘要
It is well known that CO2 geological storage is a promising long-term solution for mitigating global warming which is attributed to the excessive emission of greenhouse gases such as CO2 and CH4.The existing form of the injected CO2 is very important to the feasibility and security of CO2 storage projects in specific geological formations.The residual gas,solubility and mineral trapping mechanisms are safer forms for CO2 geological storage than the gas trapping.Dissolution of the injected CO2 accumulated beneath a low-permeability caprock causes an increase in the water density,resulting in a "convective mixing" phenomenon.This convective action may limit the escape of supercritical CO2 from the storage formation through vertical pathways such as fractures,faults and improperly abandoned wells,consequently increasing permanence and security of storage.This paper reviews the research progress of the convective activity during CO2 geological storage,and summarizes the disadvantages and issues of current studies.In addition,the suggestions on the future research directions are provided.All these efforts are expected to provide help in the studies of the density-driven convection during CO2 geological storage in China.