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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 of great significance to evaluate the change of resistivity during the formation and decomposition of methane hydrate for the investigation of gas hydrate in permafrost regions. The influence of temperature gradient on formation and decomposition of methane hydrate in grit and the resistivity response in this process were studied by using the device designed by our laboratory to measure the phase transition temperature and the resistivity of frozen soil. Experiments show that the device can accurately and effectively detect the hydrate nucleation, formation, aggregation and decomposition process. At the same time, the size of temperature gradient has a great influence on the formation and distribution of hydrate in porous media. With the increase of temperature gradient, the distribution of hydrate is more uneven. The more hydrate is enriched at high temperature, the hydrate is more The shorter the enrichment interval is. As the hydrate saturation increases during the reaction, the resistivity also increases.