ADVANCEMENT IN EXPLOITING RESEARCH ON REPLACEMENT OF CH4 FROM HYDRATE WITH CO2 IN FRIGID PERMAFROST REGION

摘要

As a kind of unconventional energy,natural gas hydrate,also known as the "Flammable Ice",is an important energy carrier.Natural gas hydrate has been discovered in the ocean and permafrost overseas,core of rock containing natural gas hydrate has also been discovered in the Shenhu marine area and Qilian permafrost,it is predicted that its amount is approximately 35 billion tons of oil equivalent.The high-efficiency safe mining method has become the "bottleneck" in utilizing natural gas hydrate resource,it is also the hotspot and aporia in the area of gas hydrate research.This paper summarizes the general way of exploitation on natural gas hydrate domestic and overseas,and advancement in experimental research on replacement of CH4 from hydrate with CO2 was paid close attention to at the same time.Then we put forward the image of replacing CH4 from hydrate with CO2 to exploit natural gas hydrate in frigid permafrost region,and analyzes the feasibility of this method.