Abstract: A key technique is put forward by analy zing the seismic data from deep strata of Dagang oilfield in East China. The technique is tocombine the prestack depth migration with model processing for improv ing the signal-to-noise ratio, namely in common reflection point (CRP)trace gather of prestack depth migration, realizing its zero time-shift stacking,by application of the model-based noise attenuation and model-based static correction methods. This tight combination bet ween the model constraint and the seismic interpretation can have the seismic datafrom deep strata better imagined, thus obtaining good results for geologic interpretation.

Key words: depth, pre-stack migration, model, signal-to- noise ratio, static correction, seismic data processing, geologic interpretation