多孔介质中气体水合物孔隙尺度分布特征  

Pore-scale Distribution Characteristics of Gas Hydrate in Porous Media

作　　者：寇璇 王屹[1,2,3,4] 李小森 KOU Xuan;WANG Yi;LI Xiao Sen(Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China;CAS Key Laboratory of Gas Hydrate,Guangzhou 510640,China;Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development,Guangzhou 510640,China;Guangzhou Center for Gas Hydrate Research,Chinese Acadeny of Sciences,Guangzhou 510640,China;University of Chinese Academy of Sciences,Bejjing 100049,China)

机构地区：[1]中国科学院广州能源研究所,广州510640 [2]中国科学院天然气水合物重点实验室,广州510640 [3]广东省新能源和可再生能源研究开发与应用重点实验室,广州510640 [4]中国科学院广州天然气水合物研究中心,广州510640 [5]中国科学院大学,北京100049

出　　处：《工程热物理学报》2020年第11期2658-2661,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51736009,No.51676190,No.51806252);广东省特支计划(No.2016TQ03Z862);中科院青年创新促进会(No.2018382);广东省自然科学基金(No.2017A030313313);广东省基础与应用基础研究重大项目(No.2019B030302004-002)。

摘　　要：天然气水合物在沉积物中的分布规律对其勘探开发起着至关重要的作用。本文采用X射线计算机断层扫描技术(X-CT),通过原位扫描气体水合物生成与分解各个阶段,研究了水合物在生成与分解过程中在多孔介质中的分布规律。实验结果表明,水合物在多孔介质中的生成位置主要受传热速度及气体扩散的影响,水合物分布呈现随机性;在分解过程中,热刺激法及降压法均导致水合物二次生成,前者可以促进水合物在多孔介质中的均匀分布,后者则使沉积物分布更加均匀。Distribution characteristics of gas hydrate in sediments play critical roles in natural gas hydrate exploration and exploitation.In this work,the X-ray computed tomography(X-CT) has been employed to investigate the distribution characteristics of gas hydrate in porous media during hydrate formation and dissociation.Experimental results indicate the heterogeneous distribution of gas hydrate in porous media during hydrate formation.In addition,the occurrence of gas hydrate in porous media is mainly affected by the heat transfer and gas diffusion.During hydrate dissociation,both the thermal stimulation process and depressurization process can lead to the re-formation of gas hydrate.The thermal stimulation process promotes the homogeneous distribution of gas hydrate in porous media,and the depressurization-induced process results in the uniform distribution of sediment grains.

关 键 词：气体水合物 生成 分解 X-CT 分布特征 

分 类 号：TE31[石油与天然气工程—油气田开发工程]