Abstract: Typical meandering stream deposits developed in Tertiary Minghuazhen Formation on the north slope of Gangxi Oilfield, of which channel lag deposit and point bar deposit (point bar) combination are important reservoir types in the area. In order to detect the sands ofMinghuazhen Formation, the generalized S transform is applied to frequency-divisional processing of post-stack seismic data, and precise time window analysis is used to collect seismic attributes on the amplitude tuning dominant frequency spectrum data volume along the layer, so as to show the distribution characteristics of the channel. The results show that channel characteristics are clear and natural and fully consistent with the drilling results, achieving the desired purpose.