A PRESTACK INVERSION METHOD FOR COMMON REFLECTION POINT SEISMIC DATA

Prestack seismic data contains the P-wave,S-wave velocity and density information of subsurface stratigraphy.If these parameters can be acquired from seismic data by prestack inversion,plenty of lithology and pore fluid information can be revealed.This paper derived the forward operator,which is generated by the plane wave propagation in stratified elastic media.A prestack three-term inversion method which is based on Brent algorithm is then proposed.This method did not need to compute the sophisticate first order and second order derivative matrix.By dealing the constraint conditions with adaptive annealing factor and penalty function,the inversion stability is improved.By introducing K-L transform in the direction substitution,the linear dependence of searching directions is effectively prevented.Application results in synthetic and real oil field data proved that this method is effective in reservoir prediction with prestack seismic data.