Wave-Equation Prediction of Multiples – Different Strategies for Different Conditions

摘要

SRME is the method of preference for data from areas with deep sea-floor, especially when a thick package of strong reflectors is present below the sea-floor. To reconstruct missing traces required by 3D SRME prediction, we use a repositioning of traces based on 3D hyperbolic moveout assumption. We use wave-equation (WE) approach when several orders of multiples are involved. WE approach is especially efficient when the main free-surface multiples are just 'pure' water-layer multiples and peg-legs. WE approach allows us to use different WE prediction schemes based on complexity of structure and in 3D it has less sampling problems than 3D SRME. In our WE approach all source-side and receiver-side multiples of all orders are suppressed simultaneously in one consistent step. The prediction and adaptive subtraction of multiples are performed in the same domain, therefore no additional sorting or additional transformations are required.