Multi-stage full wave inversion process to generate multiple sets of nonreflective data sets

摘要

The multistage FWI workflow uses multiple reflected wave-contaminated FWI models to predict surface-related multiple reflected waves. A method for implementing the technical advance of the present invention comprises: using data with free surface multi-reflected waves as input to the FWI; Generating an underground model by performing FWI with free-surface boundary conditions imposed on the top of the underground model; Using an inverse model from the FWI to predict multiple reflected waves; Removing the multiple reflected waves predicted from the measured data; Using data without multiple reflections as input to the FWI with the absorbed boundary conditions imposed on the top of the underground model; And preparing a data set without multiple reflections for use in conventional seismic data processing.