Abstract: Well J一 6 is located on the eastern slope of the Jimsar Sag which is on the eastern margin of the Junggar Basin. The core in the well shows that is developed Lucaogou Formation in the Upper Jijicao Group and the Lower Cangfangou Group. In the present paper the sporo-pollen assemblage feature from the samples of depths of 1650 to 2010m and the type of me sporo-pollen assemblage from the crude oil sample of depths of 1821.06 to 1920m are studied. The sequeces of the sporo-pollen assemblage in the Upper Permian in the well are seted. It can be referred to a monotonous type of petroleum sporo-pollen assemblage. The oil source rock is coincident with the reservoir rock in age. The oil source rock in the well J—6 is considered being the Lucaogou formation.