Two-step Multi-wave Joint AVO Inversion Based On Lateral Consistent

As a prestack inversion method,AVO inversion has become an important technology in complex hydrocarbon reservoirs prediction and evaluation,the accuary of the inversion results is a key problem of AVO inversion technique.This paper carry out a research of AVO inversion method based on kalman filtering algorithm with multi-component seismic data.In order to improve the accuracy of the density result from conventional AVO inversion,we firstly get the PP and PS wave velocity by Stewart's reflection coefficient approximation.Then we substitute the calculated them into the Aki-Richards' s three parameters PP wave inversion approximation,and get the new coefficient approximation which regard the density as only parameter.In the aspect of discontinuous seismic trace inversion results,we establish a lateral continuity with kalman filtering algorithm for each step inversion approximation.In order to improve the indication of the oil and gas reservoir and lithology,the paper proposes a multi-component inversion method based on fluid indicating factor and lithology indicator factor.Firstly,we set fluid indicator factors and lithology indicator factors the sensitivity analysis with the rock combination model.Then we screen out f ? and E? as t indicator factor,deduce the PP and PS waves reflection coefficient approximation equation,and analyze the precision of the approximation.Lastly,we establish a lateral continuity of the seismic trace with kalman filtering algorithm for the inversion approximation.We test the method this paper propose with the theoretical model and actual data.The results show that lateral constraint two-steps prestack density parameters inversion has the advantage of the results more accurately;lateral constraint prestack muti-component AVA attributes extraction is superior to PP wave.The real data illustrates the stronger applicability of AVO inversion method proposed in this paper.