Abstract: In Turpan-Hami basin, the hydrocarbon source rock in coal-bearing system of Middle-Lower Jurassic is well developed. Jurassic is characterized by widely distribution of light oil, the majority of most gas-reservoirs are condensate-gas pools. In light-oil reservoirs both solution gas-oil ratio and oil -soluble gas abundance are high. In Taibei depression, the distribution of oil-gas are featured by the coexistence of oil and gas, the distribution of gas-pools are in certain extent related to oil-gas segregation. So far, all the gas reservoirs are located in sequence of Jurassic. Absence of gas reservoir distributed in formation overlap above Jurassic may probably be associated with the undesirable cap-bed condition. Besides, there are large scale of tight sandstone gas-reservoirs occurred in sandstone formations which are interbedded or nearly the hydrocarbon source rock of deep buried Triassic and Jurassic. The widely distributed coal layer adsorbed gas is also an important potential natural gas resource.

Key words: Turpan basin, Hami basin, natural gas, gas reservoir type, distribution