AVAZ inversion for elastic parameter and fracture fluid factor

The purpose of this presentation is to provide an efficient algorithm of AVAZ (amplitude versus angle and azimuth) inversion for elastic parameters and fracture fluid factor. Through analysis of the relationship between fluid factor and the reflection coefficient, a new reflection coefficient approximation equation with fluid factor and anisotropic gradient was derived. The accuracy of the AVAZ inversion algorithm was discussed. Synthetic data were used to validate the AVAZ method. Results on synthetic data showed that P-wave reflection coefficient ( Rp ), fluid factor reflection coefficient ( Rg ) and anisotropic gradient coefficient ( RΓ ) can be estimated exactly without noise existing. The estimated P-wave reflection coefficient, fluid factor reflection coefficient and anisotropic gradient coefficient were still reasonable with the S/N ratio being 1:2.