CO2水合物在砂中生成和分解的核磁共振弛豫响应

doi:10.3866/PKU.WHXB201704194

Abstract

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 T2₂ 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.

Key words: Nuclear magnetic resonance, Hydrate saturation, Hydration number, Hydrate distribution, Relaxation behavior

He-Long. CHEN,Chang-Fu. WEI,Hui-Hui. TIAN,Hou-Zhen. WEI. NMR Relaxation Response of CO₂ Hydrate Formation and Dissociation in Sand[J]. Acta Phys. -Chim. Sin. 2017, 33(8), 1599-1604. doi: 10.3866/PKU.WHXB201704194

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NMR Relaxation Response of CO₂ Hydrate Formation and Dissociation in Sand

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NMR Relaxation Response of CO₂ Hydrate Formation and Dissociation in Sand