This paper aims at developing a sedimentary model of the Permian sandy conglomerate in the footwall of the Kebai Fault in the Junggar Basin

which can provide a reference for predicting good reservoirs.Sedimentary features of the sandy conglomerate in the study area are examined through core observation

thin section analysis and scanning electron microscope analysis.Tectonic settings and depositional conditions are taken into consideration and logging data are also consulted.The depositional environments of the sandy conglomerate in the study area can be divided into two types

namely above-water and underwater environments.Overall

the main feeder channels are large in water volume

and stable and continuous in water flow.Physical properties of the sandy conglomerate reservoirs differ greatly in different depositional environments

and the best occurs in underwater distributary channel on fan delta front.The control of shoreline on reservoir physical property is highlighted

while the distinction between alluvial fan margin and fan delta plain is obscured.A sedimentary model with alluvial fan-fan delta-lacustrine facies integrated is proposed and 3 sedimentary facies and 8 sedimentary subfacies are identified in the study area.