Two-Dimensional Joint Inversion Of Resistivity And Seismic Full-Waveform Method

The joint inversion technique combines various types of geophysical survey data into a general processing framework,which can utilize the data complementarities,reduce the inherent non uniqueness of the inverse problem,and thus enhance inversion resolution.A key difficulty in the joint inversion of two or more seemingly disparate geophysical data sets is how to couple the model parameters.A convenient un-normalized way to measure the geometrical similarity of the models is through the use of the cross-gradient function.It is of practical significance to realize joint inversion of resistivity and seismic full-waveform.The data acquisition of resistivity method is convenient and economic.Seismic exploration has the advantage of high precision of inversion.Data space inversion combined data fitting with model smoothing is used to invert resistivity.Thus,the smoothest model of fitting data can be obtained.This method reduces the solving of order number and avoids the inverse process of covariance model.Frequency-domain seismic waveform inversion,using the kinematics and dynamics of earthquake information,is computed separately based on several frequencies,which can greatly improve the inversion efficiency.The objective function of joint inversion is established based on cross-gradient theory.Then the iterative formula of resistivity and velocity model is introduced in detail.The correctness of the algorithm is verified by theoretical model.From the inversion results,we know that the algorithm is more reliable and accurate than the single one.