Elastic full waveform inversion based on frequency-division encoding
SHAO Xiangqi1,2, HE Bingshou1,2, SHI Caiwang3
1. Key Laboratory of Submarine Geoscience and Propecting Technology, Ministry of Education, Ocean University of China, Ocean University of China, Qingdao, Shandong 266100, China; 2. Laboratory of Marine Mineral Resources Evaluation and Detection, Qingdao, Shandong 266100, China; 3. Department of Earth and Space Science, South University of Science and Technology, Shenzhen, Guangdong 518000, China
Abstract：The calculation amount and efficiency limit the application of full waveform inversion technology.Source coding technology can effectively reduce the calculation amount of full waveform inversion and improve the inversion efficiency.The traditional source coding technology requires that each gun has the same receiver array,and it has some shortcomings in the adaptability of the recording system,so it can not be directly applied to the recording system with rolling array.In this paper,an elastic full wave inversion method based on frequency-division coding is proposed.Its basic idea is:In forward process,multiple shot records can be extended at the same time,but each shot record is assigned with a harmonic source of different frequency,so the wave fields forward extended at the same time do not coincide with each other in the frequency spectrum.In the process of forward and residual backward propagation of the shot point wave field,phase sensitivity detection is used to separate the single-frequency wave field of each gun to realize the complete separation of the wave fields of each gun,and then the waveform inversion gradient is constructed to update the model.Compared with the traditional source encoding method,the simultaneous interpreting method can not only be speeded up in inversion,but also be applied to the recording system with rolling array in a wider field.
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