Abstract：Using prestack AVA seismic data for inversi- on of underground P wave and S wave velocities can provide abundant elastic parameters for interpretation of stratigraphic lithology,physical nature of reservoir and oil-bearing characters.Based on approximate formula presented by Mr.Aki and Richards,the paper transforms the least square issues into finding the solution of large-scale sparse matrix,directly makes the inversion of P wave and S wave velocities;deduces generalized non-linear matrix inversion equations based on built inversional object function;adding covariance matrix of noises and covariance of model can improve the stability of prestack inversion;joint constraints by labeling of AVA synthetic records,evaluation of AVA inversion wavelet and logging and structural beds information can effectively reduce the issue of multiple solutions of inversion.Theoretical models test and real data processing showed that the method has good processed results.
