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Next: Choosing the migration velocity Up: Alvarez: Multiple attenuation Previous: Adaptive subtraction


There are several important issues with the above methodology that can impact the quality of the results. Making sure that the adjoint migration operator is a good approximation to the inverse of the migration operator can probably provide the biggest improvement. Here I used a standard wave-equation migration without any compensation for the migration Jacobian. Other important factors that are relatively easy to control are: choosing the right migration velocity, avoiding aliasing for the adjoint migration of the SODCIGs, choosing the appropriate tapered mutes for the estimation of the primaries and the multiples, choosing the threshold amplitude to compute the weight mask and muting the direct wave and the water-bottom primary reflection. I will discuss my current understanding of these issues now: