Fluid-property discrimination is always an important goal we desired in seismic exploration, and one of interested ways to achieve that is related to AVO/AVA analysis. Several non-linear AVO/AVA approximations were derived directly from Zoeppritz equation with the comparison discussed. Non-linear AVO inversion with a combination of series reversion and Gauss-Newton iteration is introduced at the end of the paper, and one of those approximations we derived is applied into non-linear AVO inversion on synthetic data using well-log. Ultimately, the comparison between non-linear inversion method and linear inversion was discussed.
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