ANALYSIS OF CHARACTERISTICS OF SEDIMENTARY RESERVOIR BETWEEN CRETACEOUS AND PALAEOGENE IN THE WESTERN PART OF THE KUQA DEPRESSION

The clastic reservoirs mainly developed on the bottom of Palaeogene Kumugeliemu group,the Cretaceous Bashijiqike formation and Shushanhe formation,and the three sedimentary reservoirs and their overlying formation consist of good reservoir-cap assemblages.At present,industrial oil-gas streams are obtained from the three reservoirs,and the exploration potential is good.The excellent reservoirs are the fan delta front and braided delta plain-front formations which are made of Conglomeratic sand,middle-fine sandstone and siltstone,where there effective reservoirs with porosity higher than 8% widely distribute in the Kelasu-dabei structural belt,the western and southern Qiulitage-Quele structural belt and the northern and eastern Wenshu heave.The reservoir property is controlled by quickly deep burying,sedimentary facies and structural movement.The region with strong folding or repeated strata,high compression stress and coarse clastic marginal facies is not an ideal location for exploration.