二氧化碳羽流地热系统中储层物性参数对热提取率的影响  

Effects of property of reservoir on heat extraction in CO_2 plume geothermal system

作　　者：封官宏[1] 李佳琦[1] 许天福[1] 石岩[1] 

机构地区：[1]吉林大学地下水资源与环境教育部重点实验室,吉林长春130021

出　　处：《可再生能源》2013年第7期85-92,共8页Renewable Energy Resources

基　　金：国家自然科学基金项目(41272254/D0213);教育部博士点基金项目(20110061110057);吉林大学研究生创新研究计划项目(20121069);吉林大学博士研究生交叉学科项目(2012DC014)

摘　　要：二氧化碳羽流地热是以超临界CO2作为地热系统的载热流体,利用天然孔隙介质,在进行CO2地质储存的同时实现深部地热资源的提取。CO2在注入地下储层后呈羽状扩散和分布,因此称这种地热开发系统为CO2羽流地热系统。在CO2羽流地热系统中,砂岩储层分布广泛,物性各异,对热提取率的影响较大。文章以松辽盆地中心凹陷区泉头组三、四段为地热储层,建立平面二维羽流地热模型,采用TOUGH2-MP软件进行数值模拟,定量评价储层物性对热提取率的影响。结果表明,温度对热提取率的影响最大,初始盐度的影响最小,故应按照"低压、低盐度、高温、高渗透、高比热"的标准选取储层,其中高温和高渗透率是应重点考虑的因素。CO2plume geothermal system（CPG）,which utilizes supercritical CO2as the underground heat-carrying fluid in natural porous medium,could achieve geologic sequestration as well as heat extraction of deep reservoir.The new geothermal system dubs CO2plume geothermal system because CO2 is distributed as plume in the reservoir.In CPG,the broad distribution and various properties of the reservoir produce great effects on heat extraction.A 2D flow model is employed to analyze the effects,based on the geothermal reservoir of K1q3 and K1q4 of Quantou Formation in the central depression of Songliao basin.The effects of reservoir property on heat extraction are evaluated quantitatively by TOUGH2-MP software.The results indicate that the effect of temperature on heat extraction is the greatest,while salinity is the least.At last,the suggestion of reservoir selection is ＂low pressure,low salinity,high temperature,high permeability,high specific heat capacity＂.Among these standards,high temperature and permeability are the keys.

关 键 词：羽流地热 热提取率 储层物性 敏感度 

分 类 号：TK529[动力工程及工程热物理—热能工程]