1. Geophysical Research Institute,Shengli Oilfield Branch Company of Sinopec,Dongying 257022,China 2. School of Information and Communications Engineering,Xi'an Jiaotong University,Xi'an 710049,China
The seismic impedance inversion is nonlinear optimization based on seismic data to obtain wave impedance parameters.The global optimization algorithm independent of the gradient information of objective function is an effective method for seismic impedance inversion.However,this method adopts a trace-by-trace inversion strategy and ignores the spatial correlation of adjacent seismic traces,resulting in poor lateral continuity of the inversion results.Given this,this study proposed a model space initialization method integrating the optimal solution of the bypass to restrict the search space of wave impedance inversion,in order to improve the lateral continuity of inversion results.Based on this,this study proposed a seismic impedance inversion method with lateral constraints based on multi-group variation differential evolution.A case of synthetic seismogram shows that this method has a higher convergence rate and better lateral continuity of inversion results than conventional methods.This method was applied to the inversion of reservoir impedance parameters of a block of the Shengli Oilfield.The obtained inversion results were in good agreement with the logging data and effectively characterize the thickness of reservoir sandstone.
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