Elastic-Wave Reverse Time Migration Random Boundary-Noise Suppression Based on CycleGAN

作     者：XU Guohao HE Bingshou XU Guohao;HE Bingshou

作者机构：Key Laboratory of the Ministry of Education for Seafloor Science and Detection TechnologyOcean University of ChinaQingdao 266100China Functional Laboratory of Marine Mineral Resources Evaluation and Exploration TechnologyQingdao National Laboratoryof Marine Science and TechnologyQingdao 266100China 

出 版 物：《Journal of Ocean University of China》 (中国海洋大学学报（英文版）)

年 卷 期：2022年第21卷第4期

页      面：849-860页

核心收录：

学科分类：08[工学] 0816[工学-测绘科学与技术] 

基　　金：The study is supported by the National Natural Science Foundation of China(No.41674118) the Fundamental Research Funds for the Central Universities of China(No.201964017) 

主　　题：random boundary reverse-time migration generative adversarial network noise suppression 

摘      要：In elastic-wave reverse-time migration(ERTM),the reverse-time reconstruction of source wavefield takes advantage of the computing power of GPU,avoids its disadvantages in disk-access efficiency and reading and writing of temporary files,and realizes the synchronous extrapolation of source and receiver *** the existing source wavefield reverse-time reconstruction algorithms,the random boundary algorithm has been widely used in three-dimensional(3D)ERTM because it requires the least storage of temporary files and low-frequency disk access during reverse-time ***,the existing random boundary algorithm cannot completely destroy the coherence of the artificial boundary reflected *** random boundary reflected wavefield with a strong coherence would be enhanced in the cross-correlation image processing of reverse-time migration,resulting in noise and fictitious image in the migration results,which will reduce the signal-to-noise ratio and resolution of the migration section near the *** overcome the above issues,we present an ERTM random boundary-noise suppression method based on generative adversarial ***,we use the Resnet network to construct the generator of CycleGAN,and the discriminator is constructed by using the PatchGAN ***,we use the gradient descent methods to train the *** fix some parameters,update the other parameters,and iterate,alternate,and continuously optimize the generator and discriminator to achieve the Nash equilibrium state and obtain the best network ***,we apply this network to the process of reverse-time *** snapshot of noisy wavefield is regarded as a 2D matrix data picture,which is used for training,testing,noise suppression,and *** method can identify the reflected signal in the wavefield,suppress the noise generated by the random boundary,and achieve *** examples show that the proposed method can significantly improve the i