Abstract: Hydrocarbon generation models of each major source bed in Junggar basin were established with hydropyrolysis method, and hydrocarbon generation models of kerogen in Mahu and Jimsar sags with dynamics parameters. Oil generation of source rock in Junggar basin peaks at Ro =1.0%~ 1.2 %.At Ro >1.0%, gas is generated in a large amount. The source rock in Permian has strong oil and gas potential, and other source rocks have strong gas potential but weak oil potential, the oil generation threshold of source rock in Fengcheng formation(Upper Permian)in Mahu sag is at the depth of 3 700m, and the oil generation threshold of source rock in Lucaogou formation(Upper Permian)in Jimsar sag at the depth of 3 250 m.

Key words: Junggar basin, Source bed, Oil-generation index, Gas-generation index, Source depression, Oil-generation model