Estimation of P-SV residual statics by stack-power optimization

David W. S. Eaton, Peter W. Cary, Armin W. Schafer

The residual-statics problem for mode-converted (P-SV) seismic data is investigated, using a method that optimizes the power of the trace-mixed stack. We have tried both the simulatedannealing and iterative-improvement methods. So far, our results using iterative improvement have been better, and have required considerably less computer time. In our algorithm, the maximum shot and receiver terms are constained independently, to allow for S-wave receiver statics that are much larger than the corresponding P-wave source statics.

We have tested this methodology using a P-W dataset from the Slave Lake area in northern Alberta. Attempts to obtain a residual-statics solution using a conventional (Gauss-Seidel) residual-statics algorithm have only been partially successful, due to the unusually large receiver-static term. By solving for receiver statics only, the trace-mixed stack-power optimization method gives a better overall stack, with more plausible source and receiver statics.