Density-sensitivity analysis about prestack multi-parameter inversion based on the exact Zoeppritz equation
Guo Qiang1, Zhang Hongbing1, Cao Chenghao2, Han Feilong1, Shang Zuoping3
1. College of Earth Science and Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 3. College of Mechanics and Materials, Hohai University, Nanjing, Jiangsu 210098, China
Abstract：Prestack seismic inversion based on the exact Zoeppritz equation and its approximations has been widely adopted but complicated problems remain.Multi-parameter inversion results are unstable,especially for the parameter of density.We develop an inversion method by constructing a new objective function which includes the edge-preserving regularization and soft constraints based on Markov random domain.We apply the fast simulated annealing algorithm to solve the nonlinear optimization problem based on the exact Zoeppritz equation.Numerical results indicate that the density is insensitive to angle variation within small incidence angle range,but it makes more contribution to the reflectivity magnitude variation.Test results on 2-D synthetic data demonstrate that a satisfactory inverted density result can be achieved within small incidence angles with the proposed approach.Field data inverted results provide detailed stratigraphic information well-matched with logging data over most parts.
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