Abstract: The genetic types and association patterns of Jurassic Sangonghe sands are analyzed based on core, mud logging and well log data of all exploration wells and development wells in Mobei arc of Junggar basin. The types of sands include subaqueous distributary channel sand, mouth bar sand, distal bar sand, front sheet sand, bank bar sand of shallow-shore lacustrine. The subaqueous distributary channel sand is subdivided into truncated and completed ones. The association patterns are composed of superimposed subaqueous distributary channel sand, superimposed mouth bar sand, assemblage of subaqueous distributary channel-mouth bar sands, assemblage of distal bar-front sheet sands and superimposed bank bar sand. This paper analyzes the time-space distribution of these sand assemblages with different origins, and determines that these sand assemblages are controlled by sediment supplies and varied holding capacities.

Key words: Junggar basin, Jurassic, sand origin, association, assemblage