Abstract：The main channel with relatively large scale of Neogene in the Bohai Sea is the key research object of rolling evaluation potential search. However, this type of channel usually extends far and the silty content of mudstone changes rapidly, which leads to the large difference in the wave impedance of the surrounding rock of the target reservoir and strengthens the false seismic response of the reservoir caused by the difference of surrounding rock. Therefore, the seismic response amplitude of the reservoir cannot effectively reflect the real changes of reservoir development, which brings great challenges to the fine prediction and characterization of the reservoir in the study area. We analyzed the characteristics and mechanism of seismic response under such complex geological conditions through forward modeling to establish the relationship of the waveform information of seismic response cha-racteristics with the corresponding phase information and geological information. We innovatively proposed an adaptive strong reflection separation method based on seismic phase decomposition. This method firstly obtains accurate and effective phase spectrum with high resolution by sparse inversion complex spectral decomposition via sparse inversion. Then the inverse transform is applied to all frequency components of the phase spectrum to form phase gather and realizes the stable phase decomposition and reconstruction of seismic data, which constructs a new seismic geological interpretation. It can effectively remove the phase component of strong reflection interference caused by the special surrounding rock and other factors to highlight the target reservoir, solving the seismic response distortion affected by the difference among surrounding rocks. Finally, the application results of theoretically synthetic data and actual data show that the new method proposed in this paper significantly improves the accuracy of reservoir prediction. It provides an important basis for the scientific deployment of wells and the calculation of proven oil reserves in the rolling evaluation of BZ Oilfield in Bohai Bay.
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