塔里木盆地奥陶系礁灰岩CO_2毛细残余封存能力实验研究  

Experimental study of CO_2 residual gas sequestration applied to Ordovician reef limestone of Tarim Basin

作　　者：李旭峰[1,2] 常春[1] 郭建强[2] 于青春[1] 

机构地区：[1]中国地质大学(北京)水资源与环境学院,北京100083 [2]中国地质调查局水文地质环境地质调查中心,河北保定071051

出　　处：《地学前缘》2011年第6期190-194,共5页Earth Science Frontiers

基　　金：国家自然科学基金项目(40772208);国土资源部地质调查项目"二氧化碳地质储存示范工程项目"(1212011087128)

摘　　要：实施CO2地质封存是目前公认的减少温室气体排放的有效方法。在可能进行封存的场所中,咸水含水层封存潜力最大,机理也最为复杂。其中毛细残余封存机理在封存量和封存安全性方面均具有十分重要的意义。在评价毛细残余封存量时,残余气饱和度是一个十分重要的参数。文中提出了测定残余气饱和度的实验方法,并实际应用于中国塔里木盆地奥陶系礁灰岩。实验通过模拟40℃、8MPa地层温度和压力条件下水驱替饱和超临界CO2气体岩心过程,得到驱替过程中压力、流量变化特征,并测定得到残余气饱和度为0.368。在进行驱替实验之前,利用饱和称重法和渗透实验,测定岩心孔隙度和渗透系数分别为2.83%、5.56×10-9 m/s。The geological storage of CO2 is widely accepted as an effective method to reduce the release of greenhouse gases to the atmosphere. Saline aquifer has the most sequestration potential and the most compli cated mechanisms among all the sites that could implement CO2 geological sequestratioru Of all the mecha nisms, residual gas sequestration has the extremely vital significance in respect of storage capacity and securi- ty, and residual gas saturation is a key parameter to calculate the capacity. In this study, an experimental method applied to a rock sample taken from Ordovician reef limestone of Tarim Basin was used to measure the residual gas saturation. Through simulating water flooding supercritical CO2 saturated core under 40 ℃ strata temperature, 8 MPa strata pressure, the pressure and flux change with time were observed during the course, and residual gas saturation was measured as 0. 368. Before the flooding experiment, sample porosity and per meability coefficient were measured as 2.83% and 5. 56×10^-9 m/s, respectively, by saturated weighing and permeating experiments.

关 键 词：毛细残余封存 残余气饱和度 礁灰岩 超临界CO2 

分 类 号：P588.245[天文地球—岩石学]