A measure of the different anisotropic parameters is essential in order to extend the seismic processing techniques to anisotropic media. The purpose of this study is to estimate the Thomsen's P-wave anisotropy parameters namely ε and δ, for transversely isotropic (TI) media. An inversion techniques based on the shifted hyperbola NMO equation is used for the estimation. Equivalent Offset (EO) gathers give a better estimate of the anisotropy parameters than conventional CMP/CDP gathers. This method was tested on the data collected over a synthetic model. It has been shown that δ can be estimated very accurately while estimation of ε is not as exact as δ. The anisotropic parameters of various formations of interest were estimated over the Blackfoot field in western Canada using this method.
View full article as PDF (0.63 Mb)