Joint amplitude versus offset inversion of P-P and P-SV seismic data

Key words:  amplitude versus offset (AVO)  joint inversion  velocity scan  optimization

Abstract:

At present, joint amplitude versus offset (AVO) inversion of P-P and P-SV seismic data, which includes elastic parameters inversion, grade inversion, impedance inversion and module inversion, considers average interval velocity ratio as constant two. The more real interval velocity ratio deviates from two, the more the data of compress wave and shear wave abstracted from the same reflector point different and result of inversion deviate. Based on directional acceleration optimization, AVO inversion can be made by scaning average interval velocity ratio and interval velocity ratio of upper layer at the same time. Not only more accurate inversion results compared with constant velocity scan, but also accurate average irfterval velocity ratio and interval velocity ratio at the both sides of reflector were obtained.