粉土内甲烷水合物形成与分解过程中的水分特征  

Water Characteristics Inside Loess During Formation and Dissociation Processes of Methane Hydrate

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,甘肃兰州730000

出　　处：《天然气地球科学》2009年第4期616-619,626,共5页Natural Gas Geoscience

基　　金：中国科学院知识创新重点项目(编号:KZCX2-YW-330);国家自然科学基础人才培养基金项目"冰川冻土学特殊学科点"(编号:J0630966)联合资助

摘　　要：用可探测土壤内部水含量变化的pF-meter探头开展了甲烷水合物形成与分解过程中多孔介质内部水含量变化研究,结果表明,该新型研究方法可有效探测实验过程中多孔介质内水含量变化。通过研究指出:水合物生成时会对介质内的水产生吸力,将水向水合物处抽吸;水合物分解时会释放水,使介质内水含量增大;温度升高会使存于多孔介质内毛细管中的水向下流动;水合物在粉土中的二次形成范围比一次形成范围更大。Water changes inside loess during the formation and dissociation processes of methane hydrate were studied with a pF-meter sensor which could detect water changes inside soil. It was proved that the new research method with pF-meter sensor could instantly detect the water changes inside loess in the experiment, effectively. It was experimentally shown that hydrate formation could cause a kind of suction which could pump the water inside loess toward hydrate and the water release from hydrate dissociation could increase water content of loess and the water existing in the capillaries of loess could flow down following temperature rise. Additionally, the scope of secondary methane hydrate formation in loess was larger than that of the initial hydrate formation.

关 键 词：甲烷水合物 形成与分解 粉土 水分 

分 类 号：TE122.1[石油与天然气工程—油气勘探]