页岩气等温吸附量及等量吸附热研究  

Research of Shale Gas Isothemal Adsorption Quantity and Equal Amount Adsorption Heat

作　　者：尹帅[1] 单钰铭[1] 郑莲慧[1] 谢润成[1] 王磊[1] 

机构地区：[1]成都理工大学能源学院,"油气藏地质及开发工程"国家重点实验室,成都610059

出　　处：《科学技术与工程》2013年第29期8572-8578,共7页Science Technology and Engineering

基　　金：国家科技项目(2011ZX5023-004-009)资助

摘　　要：对甲烷在页岩中的等温物理吸附实验进行分析,表明吸附相气体会使游离相气体体积减小,而数据处理中假设的恒体积会使视吸附量小于真实吸附量。根据Moffat推导的两者之间的关系对页岩吸附甲烷进行计算,结果表明随着平衡压力增加误差增加;3 MPa内误差较小,7 MPa左右误差超过10%;但14 MPa范围内吸附量差值(真实吸附量-视吸附量)小于1 m3/t。相对高压或低温条件下吸附量差值或误差更大,误差斜率与温度相关。TOC相近而R o明显不同时,高R o样品吸附量差值略大。R o相近而TOC明显不同时,高TOC样品吸附量差值明显偏大,表明TOC对真实吸附量及吸附误差的影响更大。根据Clausius-Clapeyron等量吸附热方程计算甲烷在页岩中吸附热的相对大小,吸附热随着吸附量的增加而降低,吸附热的大小代表吸附进行的快慢或吸附位的强弱,甲烷在该页岩上的吸附热大致在10～25 kJ/moL。The methane in the shale isothermal physical adsorption experiment were analyzed.It shows that gas can make free gas phase adsorption volume is reduced,and the assumption of constant volume in data processing can make the apparent adsorption amount is less than the actual adsorption quantity,according to Moffat＇ s derivation.The results show that the error increases as the equilibrium pressure increase,within 3 MPa the error is small,about 7 MPa error more than 10％,but in 14 MPa range adsorption quantity difference （real adsorption-measured adsorption quantity） is less than 1 m3/t;under the condition of relatively high pressure or low temperature adsorption quantity difference or error is bigger.Error＇ s slope is related to temperature; when TOC is similar but Ro is significantly different at the same time,larger samples of Ro have high adsorption quantity.When Ro is close but the TOC is obviously not at the same time,high TOC samples＇ s adsorption are quantity difference significantly.It indicates that the TOC＇s influence on the adsorption capacity and adsorption error is bigger.According to the Clausius-Clapeyron adsorption heat equation to calculate the relative size of methane adsorption heat in shale.The heat of adsorption is reduced with the increase of adsorption＇ amount.The value of adsorption that methane on the shale is around 10 ～ 25 kJ/moL.

关 键 词：页岩气 甲烷 等温吸附实验 吸附量 吸附热 

分 类 号：P617.9[天文地球—矿床学]