Abstract: Seismic exploration of oil and gas has entered the stage of complex surface, complex structure, complex reservoir, and deep target, and the "wide azimuth, wide broadband, and high density" seismic data acquisition has become the consensus of the industry.The piedmont zone exploration areas of various oil and gas basins in western China have become strategic replacement areas for oil and gas resources, and have achieved good exploration results.However, this does not mean that we have completely broken through the core technical problems of seismic exploration in the "dual-complex" exploration area.This study first defines the fundamental problem of seismic data imaging processing in the piedmont zone as the establishment of a velocity model that meets the requirements of migration imaging based on a highly variable inter-channel time difference and low signal-to-noise ratio data.Then this study comprehensively analyzed the methods and technical process of imaging of seismic data from the following aspects: the exploration seismic medium system is linear and the essence of seismic wave imaging is to realize the in-phase superposition of the reflection wavelet at different offsets at the same underground reflection point; the inter-channel time difference can destroy the linear phase characteristics of the local linear event; the dividing point between time-domain imaging processing and depth-domain imaging processing is that after static correction based on the velocity model above the bottom of the weathered layer, whether the events of the CMP gathers meet the hypothesis of a hyperbolic time-distance relationship; the current linearized tomographic velocity inversion can only estimate the smooth velocity model; and the linearized migration imaging is based only on the smooth velocity model.Based on the analyses, this study pointed out that data preprocessing based on inter-channel time difference elimination, small smooth datum, and full-depth domain seismic wave migration imaging were the effective technical routes to solve solve the problem of seismic imaging processing in the piedmont zone.