Abstract：Based on the model of 3-D structural map interpreted by seismic data, the 3-D forward gravity modeling is used to model the gravitational effect produced by stripped basement and interfaces above base,then inversion for separated anomaly of base rock is implemented to evaluate the basement density. As concerns the concrete algorithms of joint inversion,the DLSQR method widely-used for seismic tomographic imaging is introduced in potential inversion,that not only improved the stability of joint inversion results,but also increased the inversion speed. The results of test of theoretical models and inversion of real data showed that both have similar isoplethal map of density contract,the relative errors between minimum and maximum density contract is less than 4%.
