A surface wave suppression method based on area adaptive polarization filtering
WANG Zhinong1, SUN Chengyu1, WU Dunshi2, YAN Yuefeng1
1. China University of Petroleum(East China), Qingdao, Shandong 266580, China; 2. Northwest Branch, Research Institute of Petro-leum Exploration and Development, PetroChina, Lanzhou, Gansu 730020, China
Abstract:In the land 3C seismic exploration,surface waves affect seriously the subsequent data processing and interpretation.Since surface waves are characterized by low-velocity,low-frequency,and elliptical polarization,this paper proposes a surface-wave suppression method based on the area adaptive polarization filtering.First,main surface-wave distributions are confirmed according to the apparent velocity of surface wave,and the area filter is performed by S transform,so surface waves are initially separated.Then,these surface waves are analyzed with Hilbert-Huang transform (HHT) to obtian the instantanous frequency.The polarization filter window is automatically adjusted by the instantaneous frequency to perform adaptive polarization filtering.Low-frequency reflection signals are separated from surface waves to compensate results of the area filtering.Finally seismic data after the surface-wave suppression are obtained.Both numerical simulations and real seismic data applications show that the proposed method can not only effectively suppress surface waves,but also protect low frequency signals.
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