Abstract：In east Sichuan，surface condition is very complicated, landform undulates terribly，and the cropped anticline mostly consists of Permian and Triassic carbonate rocks. Its limb beds were folded severely to become very steep, vertical and even reverse，so that there occur many overthrust faults. There are quite heavy acoustic wave，surface wave, side wave and other noise waves in raw seismic data in this area. Influenced by both lateral velocity variation and some noise waves (bow tie, side wave，diffraction wave,etc.), the stacked seismic sections have quite poor image quality to cause some distorted geological structures. To cope with the terrible complicated steep anticlines in east Sichuan, the authors have taken some effective measures: improving the signal/noise ratio of seismic data before stack, constructing reasonable structure style to have good migration velocity model including interface shape and velocity values, and using optimum migration method (prestack depth migration). The technique was taken to reprocess many seismic lines in structural-complicated east Sichuan, ameliorating greatly the image of stacked seismic sections.
