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采用不同粒径(160～200目、200～300目、300～400目、400～600目)细颗粒石英砂模拟自然界中沉积物实验合成甲烷水合物,采用多步升温分解法测定了甲烷水合物的稳定温度-压力(p～T)条件.结果发现细颗粒石英砂对甲烷水合物的稳定条件有明显影响,温度最大下降1.5 K.其中160～200目的石英砂是实验测试条件下石英砂对甲烷水合物稳定条件有无影响的分界目数.每一种石英砂在不同的温度压力下甲烷水合物p-T数据点较为离散,并且不同石英砂中p-T数据曲线出现交叉,这与文献中采用规则的硅胶、玻璃球等测得的结果有所不同.文献中测定的甲烷水合物p-T数据点温度相对于纯水中甲烷水合物p-T数据点温度向左偏移量相同.
Methane hydrate was synthesized by simulating sediments in nature with different particle sizes (160-200 mesh, 200-300 mesh, 300-400 mesh, 400-600 mesh) fine quartz sand. The methane hydration was determined by multi-step pyrolysis method (P ~ T) .The results showed that the fine quartzite sand had a significant effect on the stability of methane hydrate, and the maximum temperature dropped by 1.5 K. Among them, the quartz sand of 160 ~ 200 mesh was the quartz sand under the experimental test conditions On the stability of methane hydrate with or without influence on the number of boundaries.Each quartz sand at different temperatures and pressures of methane hydrate pT data points are more discrete, and different quartz sand pT data curve cross, which is used in the literature Rules Silica, glass spheres, etc. The measured results for the pT data point for methane hydrate in the literature are offset to the left relative to the pT data point point for methane hydrate in pure water.