甲烷水合物在人工毛细管沉积物柱中的形成和分解  

Methane Hydrate Formation and Dissociation in Porous Media Formed in a Synthetic Capillary Tube

作　　者：陈敏[1,2] 业渝光[2,3] 吕万军[1,2] 刘昌岭[2,3] 解习农[1,2] 王菲菲[1,2] 

机构地区：[1]中国地质大学资源学院,湖北武汉430074 [2]国土资源部海洋油气资源和环境地质重点实验室,山东青岛266071 [3]青岛海洋地质研究所,山东青岛266071

出　　处：《现代地质》2010年第3期632-637,共6页Geoscience

基　　金：国家重点基础研究发展计划(2009CB219503);国土资源部海洋油气资源和环境地质重点实验室开放基金项目(MRE200806);湖北省自然科学基金重点项目(2008CAD095);国家海洋局海底科学重点实验室开放基金项目(KLSG0805)

摘　　要：天然气水合物在海底的形成与沉积物性质密切相关,沉积物的粒度、孔隙度、矿物组成等都可以影响到水合物的成核生长。通过拉曼测试和显微镜下观察人工毛细管模拟沉积物中CH4水合物的形成和分解过程,实验发现无论是在气液界面还是在溶有过饱和CH4的流体内,水合物都能够成核形成,但水合物更容易在气液和固液界面成核,并迅速生长;水合物在较大粒径石英砂（39~53μm）形成的孔隙内的成核机会比在粘土粒级的砂粒孔隙中的机会更大;水合物晶体主要呈发丝状附着于沉积物颗粒表面。Formation of gas hydrates in subsea sediment is closely related to the prosperities of the host formation,including grain size,porosity,mineral composition,which have significant impacts on hydrate nucleation and growth.In this paper,formation and dissociation of methane hydrates in sediment is simulated using a synthetic capillary filled with different sand particles.The results of Raman spectroscopy test and observation under a microscope show that hydrates can nucleate both in gas-liquid interface and in liquid from the dissolved CH4,but hydrates give priority to gas-liquid and solid-liquid interface for their nucleation,and then grow rapidly.Hydrates in 39 μm to 53 μm compared to clay-grade quartz sand have a better chance of nucleation.And usually hairline hydrates crystals attach to the surface of sediment grains.

关 键 词：甲烷水合物 沉积物 人工毛细管 实验研究 

分 类 号：TE122.1[石油与天然气工程—油气勘探]