物理化学学报2017，Vol.33Issue(8)：1599-1604,6.DOI:10.3866/PKU.WHXB201704194
CO2水合物在砂中生成和分解的核磁共振弛豫响应
NMR Relaxation Response of CO2 Hydrate Formation and Dissociation in Sand
摘要
Abstract
Quantification and characterization of hydrate formation and dissociation in sediments are highly important in the study of the physical properties of hydrate-bearing sediments.In this paper,the behavior of CO2 hydrate formation and dissociation in sand is studied using the nuclear magnetic resonance (NMR) technique.The components of the pore space,including gas,liquid water,and hydrate,were quantified using a convenient method by which the hydration number was determined.No abrupt change in the relaxation behavior of the sample was found during hydrate formation and dissociation.In addition,the value of mean-log T2 appeared to be proportional to the liquid water content of the sample with or without the pore hydrate.A straightforward explanation is that the liquid water in the pore space remains in contact with grain surfaces,and relaxation occurs mainly at the grain surface.The results suggest that,rather than coating the grains,the hydrate is pore-filling or cementing.关键词
核磁共振/水合物饱和度/水合数/水合物分布/弛豫行为Key words
Nuclear magnetic resonance/Hydrate saturation/Hydration number/Hydrate distribution/Relaxation behavior分类
化学化工引用本文复制引用
陈合龙,韦昌富,田慧会,魏厚振..CO2水合物在砂中生成和分解的核磁共振弛豫响应[J].物理化学学报,2017,33(8):1599-1604,6.基金项目
The project was supported by the National Natural Science Foundation of China (51239010,41572295,41502301) and Youth Innovation Promotion Association of Chinese Academy of Sciences (2015272).国家自然科学基金项目(51239010,41572295,41502301)和中国科学院青年创新促进会项目(2015272)资助 （51239010,41572295,41502301）
