According to the conditions and principles of object occurrence and in association with the data of geology

geophysical exploration

geochemistry and testing

it is pro-posed that hydrocarbons in the Tarim Basin are preserved in condensate oil and gas fields(pools)mainly as condensate gas or condensate gas with light oil-rim or bottom oil.Un-der specific geological conditions of low geothermal temperature and great burial depth in threshold and peak of oil-gas generation

the primary migration was finished through mi-crofractures

and the secondary migration took the form of gas dissolved oil and free state oil.