METHOD FOR CONTROLLED-AMPLITUDE PRESTACK TIME MIGRATION OF SEISMIC DATA

摘要

A method for controlled-amplitude prestack time migration of seismic data traces. According to the inventive method, common-offset gathers of the prestack seismic data traces (66) are 3-D Fourier transformed from the space-time domain to a preselected alternate data domain, such as the frequency-wavenumber domain (68), the wavenumber-time domain, or the slant-stack domain. A migration operator (64) that substantially preserves the seismic amplitudes of the original data traces is computed in the p-z domain. This migration operator (64) is applied to the transformed data traces in the alternate data domain (68), an imaging condition is applied (70), and the resulting migrated data traces are then transformed back to the space domain (72).