广东雷州半岛火山岩二氧化碳矿化封存潜力评估

Assessment of Carbon Dioxide Mineralization Sequestration Potential of Volcanic Rocks in Leizhou Peninsula,Guangdong Province,China

火山岩的矿物固碳作用为减少大气中的二氧化碳(CO_(2))提供了一种永久性的封存解决方案,是一种经济、安全的碳捕集封存(CCS)方式。中国火山岩分布广泛,但对火山岩固碳潜力的研究还很欠缺。文章选择广东省雷州半岛火山岩为研究区,利用MapGis软件,建立雷州半岛火山岩厚度分布的矢量地理信息数据库,插值得到三维网格化数据体;基于火山岩矿化封存机制和CO_(2)矿化封存潜力评估方法,对雷州半岛火山岩CO_(2)理论矿化封存潜力进行了计算。结果表明,雷州半岛火山岩总面积约3940 km^(2),总体积约257 km^(3),CO_(2)理论矿化封存量在19~459亿吨之间。其中以雷南火山岩区潜力最大,理论封存量为13~326亿吨;其次为雷北遂溪县以东、湛江市西部区域的火山岩区,理论封存量为2~56亿吨;东海岛区域火山岩,理论矿化封存量虽然不大(1.5~35亿吨),但因其与周边工业排放源较近,具有较好的源汇匹配条件,具备CCS潜力。研究结果不仅对于优选封存CO_(2)火山岩储集区带提供重要依据,同时为未来开展区域碳捕集与封存工程或产业提供支撑。

Mineral carbon sequestration by volcanic rocks,providing a permanent sequestration solution for reducing atmospheric CO_(2),is one of an economic and safe way of carbon capture and storage(CCS).Volcanic rocks are widely distributed in China,but research on the carbon sequestration potential of volcanic rocks is still very limited.In this paper,we selected the volcanic rocks of Leizhou Peninsula,Guangdong Province as the study area,and used MapGis software to establish a vector geographic information database of the thickness distribution of volcanic rocks in Leizhou Peninsula,and interpolated to obtain a threedimensional gridded data body.The results show that the total area of volcanic rocks in Leizhou Peninsula is approximately 3940km^(2),with a total volume of 257 km^(3),and calculated results of the theoretical CO_(2)mineralization storage capacity ranges from 1.9 to 45.9 billion tons.Among them,the volcanic rocks in the Leinan area have the largest potential,with the theoretical storage capacity ranging from 1.3 to 32.6 billion tons,followed by volcanic rocks in the area east of Suixi County in Leibei and west of Zhanjiang City,with the capacity from 0.2 to 5.6 billion tons.Although the theoretical storage capacity of volcanic rocks in the Donghai Island area is relatively small(0.15 to 3.5 billion tons),they have a good source-to-sink matching condition due to their proximity to the surrounding industrial emission sources,and so they also have good CCS prospects.The results of this study not only provide an important basis for the screening site of CO_(2)mineralization volcanic rocks,but also offer support for future development of regional CCS projects or industries.