Abstract：3-D pieces-tied data processing has become op-timal selection that the uniform geologic interpre-tation can be carried out for several adjacent blocksof 3-D data. Facing the seismic data with low S/Nratio resulted from the static corrections and lateralvariation of velocities in complex surface and geo-logic structural areas, the paper made discussion onthe techniques relative to 3-D pieces-tied prestackmigration such as amplitude compensation, pres-tack denoise, tomographic static corrections, pres-tack time migration and prestack depth migration, which gave a reference to processors for better u-sing these techniques to solve the seismic data ima-grog in complex surface and geologic structural ar-eas and improve the S/N ratio of data.
