非饱和介质中甲烷水合物形成与分解的水分变化特征  

Water change characteristics of formation and dissociation of methane hydrate in non-saturated media

作　　者：张鹏[1] 吴青柏[1] 王英梅[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,兰州730000

出　　处：《地球物理学进展》2010年第4期1339-1345,共7页Progress in Geophysics

基　　金：中国科学院重要方向项目(KZCX2-YW-330);国家自然科学基础人才培养基金冰川冻土学特殊学科点(J0630966)联合资助

摘　　要：多孔介质中甲烷水合物形成与分解过程的水分变化研究对了解自然件下沉积物中天然气水合物的形成与分解机制具有重要意义.本研究中,我们首次利用可探测土壤内部水分及温度变化的pF-meter探头,对甲烷水合物形成与分解过程中非饱和粗砂和粉砂质粘土内的水分变化特征进行了研究.结果表明:甲烷水合物的形成与分解过程可仅引起非饱和粗砂内水分的重新分布;甲烷水合物在非饱和粉砂质粘土中容易形成也容易分解.The research on water change characteristics of the formation and dissociation processes of methane hydrate in porous media is very important for understanding the formation and dissociation mechanism of natural gas hydrate in sediments. In this study, to study the water change characteristics of formation and dissociation of methane hydrate in non-saturated coarse sand and silty clay, a new pF-meter sensor which can detect water and temperature changes of soil was firstly applied to methane hydrate experiments. It was experimentally proved that water redistribution could be caused by the formation and dissociation processes of methane hydrate only in coarse sand and the methane hydrate in non-saturated silty clay was easier to form and dissociate than that in non-saturated coarse sand.

关 键 词：粗砂 粉砂质粘土 甲烷水合物.形成与分解 水分 

分 类 号：P631[天文地球—地质矿产勘探]