Abstract

Wavelet stretching due to NMO correction of seismic gathers causes problems in AVO analysis. Coupled with the degrading action of wavelet stretching is offset-dependent tuning for thin beds. Even though tuning is inherent in the data before NMO correction, its effect on AVO is more obvious on NMO-corrected data. Studies have been carried out for an analytical understanding of NMO stretching and offset-dependent tuning and their correction to improve AVO fidelity. Based on these studies, we have implemented the NMO stretching and thin-bed tuning corrections in a practical fashion for production AVO analysis. Both synthetic and real-data examples show that these corrections are necessary for performing reliable AVO analysis.

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