Dina 2 gas field is situated on the eastern side of Qiulitage structure belt,Kuche depression. It is one of the local structure under the plastic deformation layer salt-section of Jidike formation,Neogene. Paleogene sand is the major bearing gas layer.The content of CH_4in natural gas is about 86.7%~88.9%. It's wet gas.Organic geochemical research proved that gas source is mainly from Jurasic coal-bearing series.The rudiment of Dina 2 structure came up into being in Kuche period, late Tertiary, and the structure stopped in Quaternary. It's late accumulation.The large thickness saline rock,gypsite and mudstone of Jidike formation, Quaternary,is the territorial capping bed.The territorial capping bed and late accumulation are the key reasion of the preservation of Dina2  gas field.The abnormal high pressure is caused by the strongly structural compression from the north side began in Pleistocene. Geological reserves of Dina 2 gas field proved and controlled is more than 100 billion cubic metre.