青藏高原多年冻土区天然气水合物可能分布范围研究

青藏高原地区有大面积多年冻土分布,是我国陆地天然气水合物可能的赋存区域之一。在GIS平台下建立了基于三向地带性多年冻土地温分布的模型,利用地温钻孔资料对青藏高原地区多年冻土厚度做了回归统计分析,指出了青藏高原多年冻土年平均地温和多年冻土厚度的空间分布特征。结合陆域天然气水合物形成的热力学条件,对青藏高原多年冻土区天然气水合物可能赋存区域进行了研究,认为青藏高原多年冻土区天然气水合物可能主要集中分布在羌塘盆地西北部地区,其储量可能较为可观。更多还原

POTENTIAL DISTRIBUTION OF NATURAL GAS HYDRATE IN THE PERMAFROST REGIONS OF QINGHAI-TIBET PLATEAU

Natural Gas hydrate was found in permafrost regions and marine sediments. Permafrost distributes widely in the Qinghai-Tibet plateau which is the potential region for the distribution of natural gas hydrate in China. The temperature model of permafrost distribution is made by the three-dimensional zonation under the GIS. Meanwhile, a regression analysis of the permafrost thickness is carried out using the data of ground temperature drills and gives the spatial distribution characteristics of the annual ground temperature and the thickness of permafrost in the Qinghai-Tibet plateau. Combined with the thermodynamics conditions of forming natural gas hydrate, the potential regions for natural gas hydrate in the Qinghai-Tibet plateau have been studied. The result shows that the natural gas hydrate distributes mainly in northwestern Qiangtang basin, and the reserve is likely to be large. This region is the low temperature center of the Qinghai-Tibet plateau. And, the distribution ranges and reserves of natural gas hydrate decrease with the increase of the geothermal gradients. The thickness of permafrost and geothermal gradients below it are the most important controlling factors of the formation of natural gas hydrate.