Fast Simulated Annealing Method of Constrained Impedance Inversion Based on Nonlinear Regularization
Inversion for seismic impedance is an ill-posed and nonlinear problem so that inversion results are non-unique and unstable and low and high frequency components of inversion results are missed. Combining regularization with fast simulated annealing (FSA) can help to alleviate these problems. To achieve this, we developed an inversion method by constructing a new objective function including the edge-preserving regularization and absolute and relative constraints. Optimization approach is a fast simulated annealing method. Moreover, the method uses two kinds of regularization parameters, which are “weighting factor λ and “scaling parameter δ, respectively. In the fast simulated annealing procedure, the regularization parameters are adaptively adjusted by the maximum likelihood method in order to improve the inversion result and the convergence speed. We test the method on both synthetic and field data example. Tests on 2-D synthetic data indicate that the inversion results especially the aspects of the discontinuity are significantly different for different regularization functions. The initial values of the regularization parameters are too large or too small to avoid an unstable or over-smoothed result, and affect the convergence speed. The results obtained by constant regularization parameters are smoother than that obtained by adaptively adjusting the regularization parameters, where λ is reducing and δ is increasing along with the temperature decreasing. The inversion result of the field data provides more detailed information of both the layers and the faults, and coincides with field geological cases.
Hongbing Zhang Danyan Xie Zuoping Shang
Department of Earth Science and Engineering,Hohai University, 1 XiKang Street, Nanjing 210098, China Department of Engineering Mechanics, Hohai University, 1 XiKang Street, Nanjing 210098, China
国际会议
2009 IEEE International Conference on Grey System and Intelligent Services(2009 IEEE灰色系统与服务科学国际会议)
南京
英文
1517-1521
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）