模拟岩芯中天然气水合物超声检测技术

Detection of nature gas hydrates in rocks using ultrasound

天然气水合物广泛分布在大陆、岛屿的斜坡地带以及海洋和一些内陆湖的深水环境,基于双相多孔媒质理论,分析和研究在孔隙中天然气水合物发生相变过程引起的多孔介质物性的变化而导致的声波传播的改变,可以找出其中的变化规律,对于研究岩芯中的天然气水合物具有重要的理论意义和实际价值。在模拟岩芯中天然气水合物发生相变过程中,纵波和横波速度随着孔隙度的增大而减小;衰减随着孔隙度的增大而增大,这些结果表明了实验结果与理论结果基本吻合,并为进一步的实验工作打下了良好的基础。

Nature gas hydrate deposits in many places including slope areas ot continent ann islanus, sea floor and deep lakes. Study of the waves propagation changes based on the theory of double phase porous media is of significance both in theoretical and practical aspects. While phase change of natural gas hydrate takes place in the rock, with the increase of porosity, speeds of longitudinal and shear waves are reduced, and the decay increased. These indicate the general agreement between the experimental and theory results, and form a good foundation for further experiments.