Carbon dioxide(CO2)geologic storage,as a major technical option to effectively remove greenhouse gases,is widely used in not only carbon capture&storage(CCS)but carbon capture,utilization,and storage(CCUS)throughout the world.It is essential to ascertain key controls on storage site.Thus,after our analysis on pivotal storage requirements,the system of key controls was built for this storage site and each of control was appraised with consideration to two aspects,for instance storage capacity and efficiency,and storage safety and stability.Results show that,(ⅰ)12 controls are identified,among which,CO2 density,buried depth,carbon source,reservoir conditions,trap type and caprocks serve as pivotal ones;(ⅱ)the CO2 density can guarantee the storage capacity to the utmost at the buried depth from 1,000 m to 1,500 m and the carbon source purity is above 99%;(ⅲ)certain reservoirs with higher capacity function as a priority alternative.Meanwhile,high porosity(>20% )and permeability(>100 mD)are conducive to substantially en-hancing the storage efficiency,while saline reservoirs can further advance this capacity;(ⅳ)both anticlinal and sandstone traps as the preferred trap type are able to offer rather big storage space in addition to their insurance in the storage safety and stability;and(ⅴ)multiple sets of caprocks,including chemical sedimentary rock,argillaceous rock,and tight limestone with continuous and stable ex-tension together with the thickness more than 200 m,are regarded as the preferred one to prevent CO2 from escape with effect.
关键词
CO2地质封存/封存能力与效率/封存安全性与稳定性/关键要素体系/评估标准
Key words
CO2 geologic storage/Storage capacity and efficiency/Storage safety and stability/Key controls/Evaluation criteria
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