Two-parameters residual-moveout analysis for wave-equation migration velocity analysis

Two-parameters residual-moveout analysis for wave-equation migration velocity analysis

Biondo Biondi

Abstract:

The use of two-parameter RMO functions has the potential of improving the flatness of RMO-corrected gathers. The two RMO functions I propose add a second term to the conventional angle-domain RMO function. The proposed RMO functions achieve improved flatness when applied to two test CIGs that are representative of situations when either strong lateral velocity variations or anisotropy occur.

The use of two-parameter RMO functions could also improve the velocity gradients when applied within automatic MVA methods. My numerical experiments indicate that the RMO function that I defined by adding a term proportional to the fourth power of the tangent of the aperture angle should yield more accurate gradients than the one-parameter RMO function. This choice is also more robust with respect to the setting of processing parameters than the other two-parameter RMO function I introduce in the paper, which adds a term proportional to the absolute value of the sine of of the aperture angle

Two-parameters residual-moveout analysis for wave-equation migration velocity analysis