Abstract: Abstract:The area with multiphase hydrocarbon charges and multistage tectonic movements allows the oil and gas accumulation process research to be more difficult. This paper presents the oil?water contact identification of the Jurassic Ahe reservoir in Dibei area of Kuqa depression using oil inclusion abundance approach and quantitative grain fluorescence technique. The results show that there exists the palaeo-oil reservoir of Ahe formation in Yinan?4and Yishen?4wells with oil column height of over100m, and in Yinan?4well, no Ahe oil reservoir is found, but it plays a part in hydrocarbon migration pathway. Combining the tectonic evolution and the hydrocarbon generation history in Kuqa depression, this paper suggests that during the Middle to Late Miocene, the Triassic source rocks are in peak period for oil generation, making the generated oil migrate up to the Jurassic Ahe formation and form the paleo?reservoir in Yinan?4and Yishen?4wells that located at structural high. The delineation of palaeo?oil?water contacts in this area can provide a reliable and advantageous evidence for study of the hydrocarbon accumulation process and determination of the exploration target in the future. Key Words:Kuqa depression; Dibei area; Jurassic; Ahe formation; palaeo?oil?water contact; paleo?oil reservoir model