Thermal history analysis results indicate that the heat flux of Yanji Basin increased with the inerease of extension degree during fracture stage

and the value even reached 94 m W/m

2

during early Longjing stage; the value delayed by index during the subsiding stage of the basin

and it decreased during denudation stage.During late Longjing stage

the basin was uplifted and eroded. This happened to be the maturation stage of the source rocks of the basin

hydrocarbon resources generated might be easily lost due to the poor preservation condition. Thus oil and gas exploration in this basin would run a high risk.