深部咸水层CO_2地质储存工程场地选址技术方法

Site Selection Method of CO_2 Geological Storage in Deep Saline Aquifers

CO2地质储存作为环保型工程项目,其合理的工程场址是实现长期、安全封存CO2的首要前提。我国CO2地质储存工作刚刚起步,尚未形成成熟的选址技术方法体系。CO2地质储存工程场地选址应遵循目标储层有效储存量大、安全、经济、符合一般建设项目环境保护选址条件、不受外部不良地质因素影响的原则,选址技术宜采用多尺度目标逼近法,选址程序包括规划选址和工程选址两大阶段。规划选址包括国家级、盆地级和目标区级潜力评价3个阶段;工程选址旨在通过目标靶区确定、综合地质调查、钻探及灌注试验和选定场地多因子排序综合评价,最终选出良好的工程场址。深部咸水层CO2地质储存工程场地多尺度目标逼近选址技术方法对我国批量开展CO2地质储存工程场地选址具有一定的指导意义。

CO2 geological storage belongs to environmental protection projects,suitable sites are the important base for CO2 sequestration safely for long period of time.It is just the beginning stage of CO2 geological storage in China,there is no mature technical methodological system.So relevant research is being carried out in this paper.Site selection of CO2 geological storage should satisfy the principles that effective storage capacity is large enough,safe,economy,the site selection should meet the general conditions for environmental protection engineering standard,and the site should not be affected by adverse geological factors.Site selection of CO2 geological storage in deep saline aquifers could use multi-scale objective approximation method,including planning and engineering stages.Planning site selection is divided into national,basin and target grade stages.Engineering site selection to ensure the suitable locations according to targets selection,comprehensive geological survey,drilling,injection test and selected site comprehensive evaluation.Ranking multi-factor index method on the basis of AHP could be used for CO2 geological storage site selection,and an index system is established,which provides guidance for site selection of CO2 geological storage engineering in deep saline aquifers of China.