摘要
评价甲烷水合物形成和分解过程中电阻率的变化对多年冻土区天然气水合物的勘测具有重要意义。利用本实验室自主研发设计的测量冻土相变温度和电阻率分布的装置,研究温度梯度对粗砂中甲烷水合物形成和分解过程的影响以及在此过程中的电阻率响应。实验表明,该装置可以准确有效地探测出水合物成核、形成、聚集及分解的过程。同时温度梯度的大小对多孔介质中水合物的形成和分布具有很大影响,随着温度梯度的增大,水合物的分布越不均匀,在高温端富集的水合物越多,水合物发生富集的时间间隔就越短。随着反应过程中水合物饱和度的增大,电阻率随之也增大。
It is important for methane hydrate exploration in the permafrost region to evaluate the resistivity changes during the process of methane hydrate formation and decomposition of gas hydrate. In this paper, we use the devices of frozen phase transition temperature and resistivity distribution which are self designed to elucidate the methane hydrate formation and decomposition process in the coarse sand. The experimental results show that the processes of hydrate nucleation,formation,aggregation and decomposition can be detected accurately and efficiently by the experimental devices. The differences temperature gradients obviously influence the formation and distribution of the methane hydrate in the coarse sand. With increase of temperature gradient ,the distribution of the methane hydrate becomes uneven. The methane hydrate is aggregated more easily at the apex of hightemperature while the time interval of the hydrate aggregation is shorter. The resistivity of the samples increased with increase of hydrate saturation.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2012年第1期19-25,共7页
Natural Gas Geoscience
基金
中国科学院西部行动计划项目(编号:KZCX2-XB3-03)
中国科学院重要方向项目(编号:KZCX2-YW-330)联合资助
关键词
甲烷水合物
温度梯度
电阻率
粗砂
饱和度
Methane hydrate
Temperature gradient
Resistivity
Coarse sand
Hydrate saturation.
