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笔者等在青海省祁连山冻土区实施的科学钻探试验井中,直接钻获到白色冰状实物样品,并观察到燃烧现象,经激光拉曼光谱仪检测为天然气水合物,这是首次在中国陆域勘查到的天然气水合物。天然气水合物主要产于泥岩、油页岩、粉砂岩、细砂岩等层段中,与岩性关系不大;常出露在岩层的裂隙和孔隙中,受裂隙的控制比较明显;纵向上分布不连续,主要出现在井下130～400m之间,横向上无明显的对比关系。该区天然气水合物可能首先受到祁连山冻土特征等所确定的天然气水合物稳定带的限制,产出的具体部位受断裂及气源条件的双重控制,产生的烃类气体在不同级次断裂的疏导和上覆冻土层低温的共同耦合作用下,更易于在裂隙中形成天然气水合物。
In the scientific drilling test well implemented in the Qilian Mountains permafrost zone in Qinghai Province, the author directly drilled a white ice-like physical sample and observed the phenomenon of combustion. The laser Raman spectroscopy was used to detect natural gas hydrate. This is the first time in China’s terrestrial domain Natural gas hydrate explored. Natural gas hydrate is mainly produced in mudstone, oil shale, siltstone, fine sandstone and other layers, and has little to do with lithology. It is often exposed in fissures and pores of rock strata and is obviously controlled by fractures. Vertical distribution Discontinuous, mainly in the underground 130 ~ 400m between the horizontal no obvious contrast. The gas hydrate in this area may be limited by the natural gas hydrate stability zone determined by the frozen soil characteristics of the Qilian Mountains for the first time. The specific site of production is controlled by the dual control of fracture and gas source conditions. The generated hydrocarbon gas is fractured at different levels Coalescing coupled with the low temperature coupled with the overlying permafrost makes it easier to form gas hydrates in fractures.