储层物性参数对CO_2长期封存能力的影响研究  

Influence of Reservoir Physical Parameters on the Long-term CO_2 Storage Capacity

作　　者：喻英[1] 李义连[1] 杨国栋[1] 刘丹青[1] 姜凤成 杨森 

机构地区：[1]中国地质大学(武汉)环境学院,湖北武汉430074

出　　处：《安全与环境工程》2017年第5期75-83,89,共10页Safety and Environmental Engineering

基　　金：国家自然科学基金项目(41572233);高等学校博士学科点专项科研基金资助课题项目(20120145110005)

摘　　要：为系统研究储层物性参数对CO_2捕集机制的影响,根据鄂尔多斯盆地神华10万t/a CCS示范工程实际注入层的地质条件,运用TOUGHREACT软件建立了二维径向模型,探讨了温度、孔隙度、储层厚度、储层渗透率、残余水饱和度、压力、残余气饱和度、初始盐度、毛细压力和储层非均质性等储层物性参数对CO_2长期封存能力的影响。结果表明:温度、孔隙度、储层厚度、储层渗透率是影响CO_2矿物捕集量的主要控制因素;高毛细压力较低毛细压力使CO_2羽的分布更为均匀,有利于CO_2的矿物捕集。通过计算CO_2矿物捕集量对储层各物性参数的平均敏感度,评估了实际储层的CO_2矿物捕集能力,可为CCS实际工程的适宜性评价和选址提供科学依据。In order to study the influence of reservoir physical parameters on CO2 trapping mechanisms,this paper establishes a two-dimensional radial model to simulate the CO2 injection and storage using TOUGHREACT code according to the geological conditions of injection layers of Shenhua 100,000 t/year CCS demonstration project in Ordos Basin. The paper investigates the effect of physical parameters, such as temperature, porosity,reservoir thick- ness, permeability, residual water saturation, pressure, residual gas saturation, salinity, capillary pressure and reser- voir heterogeneity on the long-term CO2 storage capacity. The results show that temperature, porosity, reservoir thickness and permeability are the main controlling factors for CO2 mineral trapping capacity. Higher capillary pres- sure makes the distribution of CO2 plume more uniform compared with lower capillary pressure, which is favorable for CO2 mineral trapping. The paper evaluates the CO2 mineral trapping capacity by calculating the average sensitiv- ity of CO2 mineral trapping to the physical parameters,which can provide scientific basis for the suitability evalua- tion and site selection of the CCS project.

关 键 词：CO2地质封存 储层物性参数 矿物捕集 长期封存 数值模拟 

分 类 号：X701[环境科学与工程—环境工程]