Nuclear magnetic resonance (NMR) is an effective method used for measuring and predicting the properties of methane hydrate (MH)-bearing sediments. In this work we present the results of MH-related interface evolution during the MH dissociation process obtained by X-ray computed tomography (CT) imaging technique. Some implications of interface evolution for the NMR-based property predictions are analysed based on the experimental measurements. The results show that the areas of MH surface and MH-brine interface decrease slowly in the early stage of dissociation, but turns to decrease rapidly in the later stage. A conceptual model for determining the NMR transverse surface relaxivity (ρ₂) in the hydrate-bearing sediment is proposed by considering these changes of MH-related interface. Predictions based on this model show that the NMR transverse surface relaxivity and effective permeability are both influenced by the influencing weight and surface area proportions of the MH-brine surface and sand-brine surface.

核磁共振（NMR）是一种有效的方法，用于测量和预测含甲烷水合物（MH）的沉积物的性质。在这项工作中，我们介绍了通过X射线计算机断层扫描（CT）成像技术获得的MH解离过程中MH相关界面演变的结果。基于实验测量，分析了界面演化对于基于NMR的性质预测的某些含义。结果表明，在离解的早期，MH表面和MH-盐水界面的面积缓慢减小，而在后期则迅速减小。用于确定横向NMR表面弛豫的概念模型（ρ ₂考虑到MH相关界面的这些变化，提出了含水合物沉积物中的）。基于该模型的预测表明，NMR横向表面弛豫度和有效渗透率均受MH-卤水面和砂卤水面的重量和表面积比例的影响。