P-SV reflection coefficient approximation using shear modulus and its significance in multiwave AVO inversion;

By using Yang Shaoguo's power series expression of Zoeppritz's equation, the authors analyse AVO information content in the critical angle, and put forward multiwave multilayer AVO inversion- AVO inversion is speeded and improVed because the series expression of Zoeppritz's equation is used to compute Jacobi matrix in inversion.

To overcome ill conditioning and multiple minima in inversion process efficiently,a wavelet multiscale-regularized Gauss Newton method is presented and applied to the multiparameter inversion of fluid-saturated porous medium.

Nonlinear AVO inversion using particle filter;

AVO inversion and interpretation based on prestack depth migration;

Compensation for non-vertical received energy of geophone in preprocessing of AVO inversion;

In multiparameter constrained inversion, the wave impedance data derived from logging data are used as constraint condition to make band constrained inversion, then many parameter sections can be produced by doing extrapolation using both the result of band constrained inversion and the models of lithology and porosity which are taken from logging data inversion.