Based on the data from cores, logs, and drilling, and combined with previous data on apatite and zircon ages at the periphery of the Junggar Basin, this paper presents a systematic study of the relationship between the provenance directions, provenance types, sedimentary system spreading, sand configuration, and reservoir properties of the 2nd member of Jurassic Sangonghe Formation based on the basic principles and methods of sedimentology, stratigraphic stratigraphy, sedimentary basin analysis, and reservoir sedimentology, The study shows that the braided river regressive sedimentary sequence was formed under the tectonic background of rapid uplift/slow subsidence, and in the five- level stratigraphic framework, the strongly scoured superimposed sand bodies of the river channel are found in the 1st and 2nd sandbody assemblages, with delta regression and strong scouring of branch channels, resulting in superimposed sand bodies of the river channel, with a single microfacies type, single sand body thickness thinning upward, stable distribution of sand bodies in the whole area, and good reservoir properties. Weakly scoured superimposed sand bodies are found in the 3rd and 5th sandbody assemblage where the delta is receding and the branch channels are not obviously scoured, forming a "binary structure" of the river, with single sand body thickness thinning upward, fine grain size and good reservoir properties; the combined sand body of the river dam is found in the 4th sandbody assemblage, where a mouth bar is formed at the end of the submerged diversion channel in the process of delta receding. In conclusion, under the background of shallow water, low accommodation space, rapid uplift- slow curtain settlement tectonics, the direction, proximity and type of the source of shallow water delta are the key factors affecting the distribution of sedimentary micro- phase, and also affecting the sand body configuration and its reservoir properties and material basis.