Long-term CO2 Sequestration in Utsira and Mt.Simon Formations:Effects of Groundwater Flow and Mineral Dissolution Kinetics
The great effects of dissolution rate laws and groundwater flow on the long-term fate of CO2 storage have been seriously overlooked.To investigate their general effects,we conducted coupled reactive mass transport modeling of CO2 storage in two sandy formations(Utsira and Mt.Simon formation)with a series of elaborate simulation scenarios.The results indicated that:(1)Different dissolution rate laws of the feldspars can significantly affect their reactions and the amount of CO2 mineral trapping.The steeper the slope of the rate-ΔG relationships,the larger the feldspar reaction rate is in the area influenced by the CO2 injection.Increased feldspar dissolution will promote CO2 mineral trapping through the coupling between feldspar dissolution and carbonate mineral precipitation,or the raised pH due to feldspar.(2)Mineral trapping is more remarkable when regional groundwater flow is taken into consideration.Under the influence of regional groundwater flow,the replenishment of fresh brine from upstream continuously dissolves CO2 at the tail of CO2 plume,generating a larger acidified area where mineral trapping takes place.
CO2-water-rock interactions Reactive transport modeling Rate laws Mineral trapping Carbon storage and sequestration
Guanru Zhang Peng Lu Chen Zhu
School of Earth Sciences,Zhejiang University,Hangzhou 310058,China Department of Geological Sciences,Indiana University,Bloomington,IN 47408,United States of America;E School of Earth Sciences,Zhejiang University,Hangzhou 310058,China;Department of Geological Sciences
国际会议
The 11th International Symposium on Geochemistry of the Earths Surface(GES-11)(第十一届地球表层地球化学国际研讨会)
贵阳
英文
1-4
2017-06-11（万方平台首次上网日期，不代表论文的发表时间）