Sedimentary characteristics of Cretaceous Hutubihe formation in hinterland of Junggar Basin

Based on the principle and methods of sedimentology,the sedimentary characteristics of Cretaceous Hutubihe formation of Dixi 12 well block in Junggar Basin were analyzed by using well-logging,core data and the setting of this area.The results show that Hutubihe formation s lithologic character is fine sandstone,gray siltstone,argillaceous siltstone,brown mudstone alternate layers.Dixi 12 well block is arid braided river.And the microfacies are river channel,channel bar,embankment and flood plain.The source of the deposits comes from the northwest and southeast orientation.Hutubihe formation is divided into 14 substratas.The braided channels are mainly developed in K1h18 substrata.The braided channel becomes more and more wider in K1h17-K1h15 substratas.In K1h14-K1h13,the braided channel becomes weak.The braided channel becomes wider and separates in K1h12-K1h21 substrata,then forms a lot of sandstone bodies filled with oil.The sedimentation and facies belt distribution range of different sedimentary microfacies are main factors influencing reservoir performance of the study area.