Multiwave Inversion of Anistropic Parameter and PS Wave AVO Analysis in TTI Media
详细信息
- 责任者：Xu Shanhui (College of Geo-Exploration Science and Technology ; Jilin University ; Changchun 130026 ; China) ; Han Liguo
- 刊名：Chinese Journal of Geophysics
- 出版年：2012
- 卷期：55(2)
- 关键词：多波地震勘探 ; multiwave seismic exploration ; 各向异性 ; anisotropy
- 页码：p.569-576
- 图表：7 illus., 3 tables, 23 refs.
- 分类号：1600
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
In this paper,genetic algorithm is introduced in the process of AVO inversion for anistropic parameters in TTI media.According to the reflection coefficients of PP and PS waves in TTI media,we found the objective function of Thomsen parameters and the dip angle and the azimuth angle of the symmetry in TTI media,determined the anisotropic parameters and the dip angle,azimuth angle of the symmetry from inversion of the reflection coefficients of the PP wave and the PS wave.We analysed the accuracy and stability of the inverse outcome,found that the inverse outcome of PS wave is better than the outcome of PP wave and the veracity of the symmetry dip angle is significantly higher than that of symmetry azimuth angle.By the forward modeling we explained why this happened.Finally,by the research of PS wave AVO gradient,a method is proposed by which we can qualitatively analyze the symmetry dip angle of TTI media.