固体地球物理学术报告通知-Dr. Sanzong Zhang

The seismic data, including transmitted waves, primary reflections, and multiples, has been widely applied to estimate velocity model and migration image. However, reverse time migration uses only the primary reflections to image the geological structure in the subsurface, and it also introduces multiples as crosstalk noises into migration images. Full waveform inversion makes full use of all information in the seismic data to  invert  for  a  high resolution  of  velocity  model.  Therefore,  full  waveform  inversion  provides  a  more balanced illumination to image the subsurface than reverse time migration, especially for the complex geobodies, such as salt and subsalt. This talk would introduce a new technology to invert for the subsurface imagedirectly from full waveform inversion, which avoids the conventional time-consuming preprocessing, velocity model building, and migration. Compared with reverse time migration, the image directly from FWI often provides  additional  structural  information with  better  illumination  and  higher signal-to-noise  ratio. Some  real examples demonstrate its advantage and benefit in the industrial application.