Abstract：In recent years，time-lapse seismic reservoir monitoring technique has rapidly developed. The inconsistent factors always existed in practical time-lapse seismic production，mainly are four aspects as time delay of signal，energy difference of signal，bandwidth difference of signal and phase difference. In order to remove or reduce the inconsistent factors，there are four cross-equilibration techniques in time-lapse seismic data processing:1.time shift of data;2.mean-square-root (msr) energy compensation(amplitude equilibration);3.bandwidth equilibration;and.phase equilibration.The paper introduced the four equilibration techniques and used them for data processing combining with time-lapse seismic data in Bohai area，resuited in good effects.
