A Curvelet threshold iteration method based on energy ratio for surface-wave suppression
LI Jiwei1, LIU Xiaobing2, ZHOU Junhua1, JIAN Shikai3, ZENG Zhen1
1. Southwest Branch, GRI, BGP Inc., CNPC, Chengdu, Sichuan 610000, China; 2. Exploration and Development Research Institute, Southwest Oil & Gas Field Company, PetroChina, Chengdu, Sichuan 610000, China; 3. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China
Abstract:The surface-wave suppression with the Curvelet transform is affected by the surface-wave and effective wave overlapping in the Curvelet domain.In the practice,the Curvelet transform cannot completely separate surface waves from effective waves.Therefore this paper proposes a Curvelet threshold iteration method based on energy ratio for surface-wave suppression.Using their characteristic differences in the frequency,velocity,and direction,effective waves and surface waves in different bands are decomposed in the Curvelet domain for many times.In different scales and angles,multiple iterations with different thresholds are carried out based on the distribution characteristics of surface waves and effective waves.According to our applications,the proposed method achieves better surface-wave separation and suppression than conventional methods.
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LI Jiwei, LIU Xiaobing, ZHOU Junhua, JIAN Shikai, ZENG Zhen. A Curvelet threshold iteration method based on energy ratio for surface-wave suppression. Oil Geophysical Prospecting, 2019, 54(5): 997-1004.
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