Abstract: The Badaowan formation of Jurassic in Dinan swell in Junggar basin is a front sub?facies of fan delta. Based on the core observation and petrophysical property analysis data, this paper points out that muddy interlayers and varied petrophysical property interlayers are developed in the fan delta sand bodies in this area. The rock?electric relationship identification standard for the interlayers is determined using logging data, their plane and profile distribution ranges are discussed, and it is suggested that the interlayers are mainly distributed at the top of the channels, the bottom of the sand bar and the central distributary bay, by which the quantitative knowledge database of the interlayers is established. Combined with the tracer validation of injection?production wells, it is concluded that the key reasons for influencing injection?production relationship and effects are the superimposed connecting relationship of reservoir sand body and the interlayer distribution