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增强地热系统CO2是以CO2为工作介质的地热开采,既能改变能源结构,又能进行CO2地质封存减少温室气体排放,这使得增强地热系统显现出巨大的使用价值。福建省拥有丰富的地热资源,具有良好的干热岩赋存背景。在前人研究数据的基础上,获得福建省地区不同深度的可采地热田面积、干热花岗岩孔隙率和CO2溶解度值,利用体积法估算福建省3~7 km深处花岗岩的增强地热系统CO2的封存容量。结果显示,福建省3~7 km深处花岗岩CO2-EGS潜在封存总量上限为583 145.424 Mt,下限为102 050.449 Mt,上限约占全国CO2-EGS理论封存容量的7.42%,下限约占1.30%(全国CO2-EGS理论封存容量为7 862 Gt),其中增强地热系统CO2(CO2-EGS)封存量随着深度的增加而逐渐增加,在7 km处达到最大,为场地评价和政策制定等提供参考。
Enhanced geothermal system CO2 is the geothermal exploration using CO2 as the working medium. It not only can change the energy structure but also can CO2 geological storage reduce the greenhouse gas emission, which makes the enhanced geothermal system show great value. Fujian Province has abundant geothermal resources and has a good background of dry-hot rock deposits. Based on the data of previous studies, the available geothermal field, the porosity and the solubility of dry-hot granite in different depths in Fujian Province were obtained. The volumetric method was used to estimate the enhanced geothermal system CO2 of granite in the depth of 3 ~ 7 km in Fujian Province The storage capacity. The results show that the upper bound of CO2-EGS granulite in Fujian province is 583 145.424 Mt with the lower limit of 102 050.449 Mt, and the upper limit accounts for 7.42% of the theoretical CO2-EGS theoretical storage capacity with the lower limit of 1.30% (The theoretical storage capacity of CO2-EGS in the whole country is 7 862 Gt). The storage capacity of enhanced geothermal system CO2 (CO2-EGS) gradually increases with depth and reaches the maximum at 7 km, providing for site evaluation and policy formulation reference.