Synthetic Source Record Interactive Residual Migration Velocity Analysis Based on Controlled Illumination

Abstract

AbstractIn this paper, we present a new migration velocity analysis method–synthetic source record interactive residual migration velocity analysis method based on controlled illumination. The differences between this method and other similar methods are: (1) The fast synthetic source record algorithm based on the wave theory is adopted in prestack depth migration; (2) The plane wave source is used in migration that is consistent with the velocity analysis method; (3) By using the controlled illumination, the distortion of the plane wave source wavefield due to the lateral velocity variation is avoided therefore the error of velocity analysis is reduced and; (4) The practical velocity spectrum makes the interactive migration velocity analysis feasible and convenient. The results of model and field data of Xinjiang prove that this method is valid and practical for migration velocity analysis.