27 October, 2019
Yike Liu is a Professor in Institute of Geology and Geophysics, Chinese Academy of Sciences. He earned an MS. in the Department of Physics, Peking University, 1982, and his Ph.D in 1998 in Institute of Geophysics, Chinese Academy of Sciences. His work focuses on the migration of multiple, full waveform inversion, multiple attenuation, seismic signal noise attenuation, seismic static correction and seismic imaging. He has served as the associate editor of Geophysics (SEG). Two papers published in Geophysics in 2011 and in 2018 were recommended to be "Geophysics Bright Spots" by The Leading Edge (2011, No.10; 2018. No. 8).
Talk title: Controlled-order multiple waveform inversion
His talk will introduce a novel approach on full-waveform inversion (FWI) using multiples. FWI should fit all wave types including direct waves, diving wave, primary, and multiples. However, when an initial model is far from the true model, FWI will encounter difficulty in matching multiples. Physically, multiples can contain more subsurface information compared to primary and diving waves. The objective function we seek to minimize consists of the data difference between the modeled data using a lower-order multiple as the source and the higher-order multiple as data. This method is denoted as controlled-order multiple waveform inversion (CMWI). The numerical examples demonstrated that the CMWI is a promising method to improve velocity updates.