Abstract

The quality of reservoir properties estimated from seismic data depends on the quality of input seismic data and favorable rock physics relationships. The seismic data, input to amplitude-versus-offset (AVO) inversion, is assumed to have gone through amplitude friendly seismic data processing. But, even after careful processing, there are always some noise present in seismic data, and the two commonly noise types present in processed seismic data are multiples and residual moveout. These noises will affect seismic inversion for rock property like impedance, and therefore reservoir property prediction from seismic. Out of these two noise types, the presence of residual moveout is worse for prestack seismic inversion and is also more difficult to attenuate from seismic data. Residual moveout of 10ms at the far angle of 60 degrees in seismic angle gather is common and this residual moveout is more problematic than multiples. We can reduce the effects of residual moveout on seismic inversion by not using far angles data but that will affect the quality of inverted rock properties, especially shear impedance and density. I will discuss the effects of these noises in wide angle AVO inversion with a synthetic seismic data example.