P-SV wave elastic impedance and fluid identification factor in weakly anisotropic media

The P-SV wave reflection coefficients in VTI and HTI media were obtained by approximation of the Jilek (2002a and b) equation in orthotropic anisotropic media. An approximate equation for P-SV wave elastic impedance can be derived from the combination of the new coefficients with S-wave elastic impedance (Duffaut et al., 2000). On this basis, the fluid identification factor in weakly anisotropic media was constructed and used to identify the Castagna and Smith (1994) lithologic combination and achieved good results. Finally, we specifically analyzed the anisotropic parameter impacts P-SV wave elastic impedance and fluid factor trends.