NMR Relaxation Response of CO2 Hydrate Formation and Dissociation in Sand

doi:10.3866/PKU.WHXB201704194

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	NMR Relaxation Response of CO2 Hydrate Formation and Dissociation in Sand
	Tian Hui-Hui 1; Chen He-Long 1,2; Wei Chang-Fu 1; Wei Hou-Zhen 1
刊名	ACTA PHYSICO-CHIMICA SINICA
	2017
卷号	33 期号:8 页码:1599-1604
关键词	Nuclear magnetic resonance Hydrate saturation Hydration number Hydrate distribution Relaxation behavior
ISSN号	1000-6818
DOI	10.3866/PKU.WHXB201704194
英文摘要	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 T-2 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.
WOS研究方向	Chemistry
语种	英语
出版者	PEKING UNIV PRESS
WOS记录号	WOS:000405216100014
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/4081]
专题	岩土力学所知识全产出_期刊论文国家重点实验室知识产出_期刊论文
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn ; 2.Univ Chinese Acad Sci
推荐引用方式 GB/T 7714	Tian Hui-Hui,Chen He-Long,Wei Chang-Fu,et al. NMR Relaxation Response of CO2 Hydrate Formation and Dissociation in Sand[J]. ACTA PHYSICO-CHIMICA SINICA,2017,33(8):1599-1604.
APA	Tian Hui-Hui,Chen He-Long,Wei Chang-Fu,&Wei Hou-Zhen.(2017).NMR Relaxation Response of CO2 Hydrate Formation and Dissociation in Sand.ACTA PHYSICO-CHIMICA SINICA,33(8),1599-1604.
MLA	Tian Hui-Hui,et al."NMR Relaxation Response of CO2 Hydrate Formation and Dissociation in Sand".ACTA PHYSICO-CHIMICA SINICA 33.8(2017):1599-1604.