Abstract:

The identification of gas hydrates is the foundation for its exploration and research. The exploration level of gas hydrate in permafrost areas in China is low, and it is different from marine gas hydrate in existing environment and occurrence shape and accumulation mechanism. Therefore, it is urgent to find a new identification method for gas hydrate in permafrost areas. A continuous research was undertaken to identify gas hydrates in 14 drill holes located in Sanlutian of Muli, Qinghai which were carried out by Qinghai No.105 Coal Geological Exploration Team. Based on this research this paper builds a real-time identification method for gas hydrates, namely recognizing the obvious sign of ice-shape gas hydrates and boiling water and water seep age detected by gas logging and core analysis. After further verification, this new real-time identification method which is supported by physical and chemical characteristics of gas hydrates is proved to be more reliable and applicative. Finally, it summarizes the abnormal symbol and obvious sign and recognizing method for gas hydrates identification.

Key words: permafrost area, natural gas hydrate, real-time identification method, direct mark, Sanlutian of Muli in Qinghai