Abstract: On the base of concept of petroleum system,the authors made a concise description of Jurassic petroleum system in the north part of Kashen depression with regard to its essential geological elements and principal process,and pointed out emphatically an important role for analysis of background of sedmentary basin played in petroleum system studies.Meanwhile,the authors believed that the potential area for hydrocarbon exploration could be placed on surrounding of Wuque and extending to 30km eastward,and deep structure and overlapped trips should be taken into account in selection of exploration targets.