Abstract:Migration velocity is the key factor which influences the migration result. In the paper, we put forward four new methods for making migration velocity spectra by using generalized Radon transform, namely, stack migration velocity spectrum and semblance migration velocity spectrum,both of which can be computed in either time domain or depth domain. Performance of generalized Radon transform imaging was tested using real data, then four kinds of migration velocity spectrum were computed practically. Finally, we come to the conclusion: migration velocity spectrum can be easier interpreted than stack velocity spectrum; depth-domain migration velocity spectrum has higher resolution, better continuity and is easier interpreted than time domain migration velocity spectrum; and semblance migration velocity spectrum has better performance than stack migration spectrum.