Study on the method of suppressing surface wave by Curvelet transform
Li Jiwei, Zhou Junhua, Liu Xiaobing, Feng Rongchang, Duan Xiaoxu · 2019
The Curvelet transform has features such as multi-scale, multi-direction, multi-resolution, etc. It can separate the effective wave and the surface wave in the Curvelet domain by using the characteristics of the frequency, velocity, and direction of the surface wave and the effective wave. Thus it can suppress the surface wave. However, the effect of suppressing the surface wave is affected by the degree of overlapping of the surface wave and the effective wave in the Curvelet domain. In actual seismic data, effective wave and surface wave cannot be completely separated in the Curvelet domain. In this paper, a method of Curvelet threshold iterative based on energy ratio is proposed. First, decomposing the effective wave and the surface wave in the Curvelet domain for many times, then, using different frequency bands and different threshold values to perform multiple information reconstruction, which can effectively separate the effective wave and the surface wave. In this way, a good surface wave suppression effect is achieved.