深部咸水层CO_2地质封存对地层压力环境的影响  

Effect of CO_2 geological sequestration in deep saline aquifer on formation pressure environment

作　　者：胡叶军 王蔚[3] 任杰[1,4] 王媛[1,4] HU Yejun WANG Wei REN Jie WANG Yuan(College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China Shift Design ＆ Research Institute of Communications, Jiaxing 314001, China College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210098, China)

机构地区：[1]河海大学土木与交通学院,江苏南京210098 [2]嘉兴市世纪交通设计有限公司,浙江嘉兴314001 [3]河海大学水利水电学院,江苏南京210098 [4]水文水资源与水利工程科学国家重点实验室,江苏南京210098

出　　处：《河海大学学报（自然科学版）》2016年第6期512-518,共7页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金(51179060);高等学校博士学科点专项科研基金(20110094130002)

摘　　要：针对深部咸水层CO_2地质封存过程中流体的运移和压力的传递现象,利用美国Frio地区的CO_2咸水层封存试验实测数据,建立二维多岩相结构模型,模拟分析CO_2地质封存中CO_2注入阶段岩石孔渗性能的变化特征、岩层压力增加的变化特征以及CO_2羽流的演化规律。结果表明,超临界CO_2在驱替咸水溶液的过程中形成类似漏斗状的扩散晕,蒸发作用产生的盐沉淀主要位于井附近的单气相区,随着盐沉淀的增加,井周围的渗透率降低、压力积聚;盖层渗透性提高避免了储层内部出现过大压力,但却增加了泄漏的可能性。The process of CO2 sequestration in deep saline aquifers involves fluid migration and pressure transmission. Based on the field data of CO2 sequestration in saline aquifers in the Frio region of the United States,a two-dimensional multi-lithofacies model was established. The variation characteristics of the rock permeability during CO2 injection,the variation characteristics of the rock pressure,and the evolution of the CO2 plume were simulated and analyzed. The results show that the formation of a funnel-shaped diffusion halo was observed when supercritical CO2 displaced the salt water,and salt precipitation due to evapotranspiration mainly occurred in the single gas phase region near the well. As salt precipitation increased,the permeability near the well decreased and the pressure increased. If the permeability of the cap rock is improved,the pressure in the reservoir will decrease,but the possibility of leakage will increase.

关 键 词：深部咸水层 多岩相模型 固体饱和度 CO2羽流 盖层压力 

分 类 号：TE122[石油与天然气工程—油气勘探]