Abstract：Hinterland of Junggar basin,situated in slope and sag, is characteristics of simple structures and undeveloped fractures, therefore, the structural traps don't developed but exploration potential of subtle traps is very great. The paper draws distribution map of sedimentary system based on the principle of high-resolution sequence stratigraphy, and makes the sand body model constrained by stratigraphic sequence, quasi-horizons group and quasi-stratigraphic sequence. The distribution map of sedimentary system displays the braided delta in lowstand and highstand characterized by early and latterly time superimposition and planar migratory. The sand body model shows two sand-rich areas: (1)Zhongsan block and Zhongyi block and (2) Xiayan-3 wall site. The former progressive and transgressive sandstones and distinct pinchout form typical uplap and downlap lithologic traps. Meanwhile, it is considered that the matched relationship between high and low data values and strong reflections on seismic sections represents sandstone-rich area and sandbody-developed trend, according to the analysis of seismic mean-square-root amplitude attribute and lens and updip pinchout like strong reflection events are coincident with seismic phase interpretation of delta sand body or beach sand and sandbar.
