多孔介质对天然气水合物形成的影响  

inpact of porous medium on gas hydrate

作　　者：李明川[1] 樊栓狮[2] 赵金洲[3] 

机构地区：[1]中国石油大学(华东),山东东营257061 [2]中国科学院广州天然气水合物研究中心,广东广州510640 [3]西南石油学院,四川成都610500

出　　处：《石油物探》2007年第1期13-15,共3页Geophysical Prospecting For Petroleum

基　　金：中国科学院知识创新项目(KZCX3-SW-219)资助.

摘　　要：天然气水合物大量存在于海洋底部的淤泥多孔介质中,但多孔介质对天然气水合物形成过程的影响规律究竟如何,从理论和实验上进行了探讨。相平衡模型表明,多孔介质的表面张力作用使多孔介质毛细管中的气体—水合物—水达到三相平衡；对多孔介质和自由液面的相平衡影响因素分析表明,在相同浓度条件下,多孔介质中天然气水合物形成相平衡的温度更低,压力更高；对多孔介质和自由液面天然气水合物的实验分析表明。多孔介质对水合物的形成过程(天然气溶解阶段,水合物诱导阶段,水合物成长阶段)的影响程度不同,多孔介质缩短了水合物形成的诱导时间,在成长阶段较之自由液面生长的速率要快。There exists abundant gas hydrate in porous slurry medium at ocean bottom.Aiming at this issue,the impact of porous medium on forming process of gas hydrate is theoretically and experimental- ly researched.The phase equilibrium model shows that the surface tension in porous medium makes the gas-hydrate-water in capillar- ies keep three-phase equilibrium.The analysis of affecting factors on phase equilibrium between porous medium and free surface indi- cates that,in the same consistence,the temperature needed to form phase equilibrium is quite low while the pressure is high.The experiment of porous medium and free-surface gas hydrate suggests that the impaction degree of the porous medium on the forming process of the hydrate differs in different phases.The porous medi- um shortened the induction time,and so the growth rate at grow- ing stage is faster than that of the free surface.

关 键 词：天然气水合物 多孔介质 形成过程 相平衡 实验分析 温度 压力 

分 类 号：P631.4[天文地球—地质矿产勘探]