The invention provides a
wave equation prestack migration performance optimization method based on mixed base DFT (
discrete Fourier transform ) and belongs to the field of the application and the research of the new oil-gas exploration physical geography technology in the geoscience. The method comprises the following steps that firstly, the relative optimum transform length and the calculation time are obtained through analyzing the relationship between the transform length and the transform
time based on the mixed base DFT function, and a
resource file is formed; then, the optimum transform length is obtained in a mode of finding a sequence table and the
resource file according to the singe shot imaging range and the reference edge expanding number given by users; and finally, the two-dimensional
Fourier transform time is relatively minimum through regulating the edge expanding range of the
wave field extrapolation, so the calculation efficiency of the frequency-
wavenumber domain
wave equation prestack migration is improved. The
wave equation prestack migration performance optimization method has the advantages that the two-dimensional
Fourier transform time is reduced, the calculation efficiency of the
single shot migration is improved, and in addition, the
imaging quality is reduced. The wave equation prestack migration performance optimization method is provided by aiming at the SSF (space
simulation facility)
continuation operator, and can be completely expanded to all frequency-
wavenumber domain one-way wave prestack migration algorithms.