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2008年冬季和2009年夏天首次在我国陆域祁连山冻土区钻获到天然气水合物实物样品。野外直接观察到白色冰状天然气水合物与点火燃烧现象及其他明显的异常现象,如含天然气水合物岩心表面强烈地冒气泡、渗出水珠、没入水中冒出长串气泡、井中释放异常压力气体、密闭条件下解析出异常含量气体、岩心晾干后留下重烃斑迹、残余细蜂窝状构造、伴生晶型完好的菱形自生方解石矿物、热红外低温异常等现象;室内激光拉曼光谱检测到天然气水合物笼状体峰及其包含的烃类气体峰,宏观地球物理测井曲线上显示含天然气水合物岩心段存在明显偏高的电阻率和声波速度异常。祁连山冻土区天然气水合物及其异常现象主要产出在冻土层下130~400 m之间的细砂岩孔隙与裂隙中及泥岩、油页岩、粉砂岩等裂隙中。
Natural gas hydrate physical samples were drilled for the first time in the winter of 2008 and the summer of 2009 in the permafrost region of Qilian Mountains in China. In the field, white ice-like gas hydrates, ignition and combustion, and other obvious anomalies were directly observed. For example, bubbles on gas hydrate-bearing cores strongly bubbled, exuded water drops, long bubbles did not appear in the water, and abnormal pressure was released in the wells Gas and airtight conditions, the samples with abnormal gas content are analyzed after the cores are dried, leaving heavy hydrocarbon stains, residual fine honeycomb structure, rhombohedral authigenic calcite minerals with associated crystal type, and thermal infrared low temperature anomalies; indoor laser Raman spectroscopy Gas hydrate cages peaks and hydrocarbon gas peaks are detected, and the macroscopic geophysical well log shows that there is a significantly higher resistivity and acoustic velocity anomaly in the core section of the gas hydrate. The main output of gas hydrate and its anomalies in the permafrost region of Qilian Mountains are mainly in pores and fissures of fine sandstone and fractures of mudstone, oil shale and siltstone in the range of 130-400 m below permafrost.