A ghost wave suppression method based on frequency-slowness domain extension by optimization of key parameters
QING Jie1, GU Hanming1, WANG Jianhua2,3
1. School of Geophysics and Geomatics, China University of Geosciences, Wuhan, Hubei 430074, China; 2. CNOOC Research Institute Co., Ltd., Beijing 100028, China; 3. National Engineering Research Center of Offshore Oil and Gas Exploration, Beijing 100028, China
Abstract：The notch characteristics of ghost waves restrict the effective bandwidth of marine seismic data, and thus ghost wave suppression is an important step in the broadband processing of marine data. The delay time and amplitude difference coefficient of ghost waves and primary reflections are the key parameters of ghost wave suppression, and the accuracy of the two parameters directly affects the processing results of ghost waves. Due to the influence of rugged seabed, choppy sea surface, varying reflection layer depth, and other factors, the ghost wave parameters fluctuate with space and time in practice, which results in errors in ghost wave suppression ope-rator, and positive processing results cannot be obtained. Therefore, we construct a wave field extension operator based on the ghost wave suppression method in a frequency-slowness domain and use a sliding time window to reduce the influence of time-varying ghost wave parameters. After that, we add and subtract one extension record from the original seismic data in the sliding time window, respectively, take the solved minimum sum of the absolute values of the product of new records as the measurement, and perform alternating iterations to explore the optimal average delay time and amplitude difference coefficient of the ghost waves, so as to suppress the ghost waves. The synthesized data of inclined cables and the actual data calculation show that this method can effectively suppress ghost waves, expand frequency bands, and improve the resolution of seismic data.
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