对于研究区沉积体系，在少井甚至没有钻井的情况下难以获得可靠的结论。因此，探索运用三维地震信息进行砂组单元的沉积体系研究。在区域沉积背景、单井沉积微相研究的基础上，介绍了在400 多km² 的范围内，借助各类三维地震信息，以谱分解资料确定砂岩的平面展布特征；以振幅体切片、波形相似体切片、地震反射波形特征确定水流主干通道；以波形相似体确定沉积体边界。进而对准噶尔盆地中部SWD 地区三工河组二段Ⅰ砂组进行沉积体系研究，建立了东部、西部两大沉积体系，确定4 支干流水道，为研究区岩性圈闭的解释评价打下了良好的基础。

It is difficult to obtain credible results from the study on the depositional system in sparse-borehole areas. The advanced 3D seismic information is used in the study on detailed depositional system. Based on the regional depositional settings and single well sedimentary microfacies, we apply spectral decomposition data to analyze the sand distribution in the area of about 400 km², use amplitude slice, waveform analogue slice and reflection section to confirm the main stream channels, and use waveform analogue slice to determine the sedimentary boundary. The groupⅠ in the second member of Sangonghe Formation in the central Junggar Basin is divided into two depositional systems and four stream channels, which provides foundation for the interpretation of the lithologic traps in the study area.