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摘要
Comparing with post-stack data, the pre-stack seismic data contains more information of the underground stratigraphic characteristics. By using AVO information and solving the approximate formula of Zoeppritz equation, pre-stack inversion can get elastic parameters directly, including density, upsilon(p) and upsilon(s). That can improve our understanding of the underground geology greatly. Pre-stack seismic inversion, being essentially a nonlinear problem, was mostly solved approximatively by linear methods at present, which reduces the precision of seismic inversion. Based on Aki-Richards approximate formula, the paper proposed a reverse weighted method to balance the response difference caused by each parameter coefficient, and introduced quantum Monte Carlo method, with strong nonlinear search ability to seek the global optimal solution, into the pre-stack inversion for solving nonlinear equations directly, which could improve the precision of pre-stack inversion and the ability of quantitative reservoir characterization. The numerical simulation and examples both denote that this method has high calculation accuracy and good stability.
- 出版日期2011-8
- 单位中国石油天然气股份有限公司勘探开发研究院
