Abstract: The pre-Jurassic is the important sequence for replacement of petroleum resources in Tuha basin. There are three sets of source rocks developed in Kumu swell. They are the Upper Carboniferous, the Taodonggou group of Permian and the Aydingkol Lake formation of Lower Permian, in which faults and traps are well developed with good types of traps and abundant resources. Three major oil-bearing systems such as Jurassic, Permian-Triassic and Carboniferous exist at this area, becoming a favorable target area for oil migration and a giant and multi-sequence oil-bearing zone. The oil-gas field has been found in northern margin of Kumu swell. The structural belts of the southern margin have the same conditions for oil and gas accumulation. They could be the major exploration regions in the near future.

Key words: Tuha basin, Kumu swell, structural belt, oil-gas exploration