Research on Combination Suppression Technology of Interlayer Multiple Wave in Huhehu Depression

Multiple sets of coal seams developed in Damoguaihe Formation and Nantun Formation in Huhehu Depression, Hailar Basin, leading to the development of interlayer multiples, which seriously affects formation imaging below Nantun Formation. The identification and suppression of multiple waves has always been the key and difficult point of seismic data processing in this area. By regional geology and VSP logging data, seismic data, this paper analyzes the characteristics of multiple wave types and generation horizon, distribution, energy, periodicity, and separability in this area, and proposes “three-step combination approach” to suppress interlayer multiples, which is high resolution anti-aliasing parabolic Radon transform approach in CMP domain to suppress multiples with middle and large offset, predictive deconvolution in τ-p domain approach to suppress multiples with small offset, wide azimuth parabolic Radon in CRP domain approach to suppress remain multiples. Based on the principles of different multiple suppression approaches, the applicability, advantages and disadvantages of each approach are analyzed. Practical seismic data processing shows that, section after multiple suppression by combination approach is in good agreement with the synthetic record, and the correlation is high. This approach overcomes the limitation that it is difficult to suppress interlayer multiples by only one approach, attenuates interlayer multiples effectively, and reduces the artifacts in structure and reservoir identification, and further improves imaging accuracy. The approach proposed above provides a good reference for seismic data processing in similar areas in Huhehu Depression, Hailar Basin.