基于入射角的两项流体阻抗反演方法  

Two-term elastic impedance inversion based on the incident-angle approximation

作　　者：李超[1] 印兴耀[1] 张广智[1] 王保丽[1] 刘倩 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,青岛266580

出　　处：《地球物理学报》2014年第10期3442-3452,共11页Chinese Journal of Geophysics

基　　金：国家重点基础研究发展计划(973计划)项目(2013CB228604;2014CB239201);国家油气重大专项(2011ZX05014-001-010HZ);中国石油科技创新基金项目(2011D-5006-0301);中央高校基本科研业务费专项资金项目(11CX06003A)联合资助

摘　　要：本文在孔隙弹性介质理论的指导下,基于入射角AVO近似方程推导了包含Russell流体项的两项AVO近似方程和相应的弹性阻抗方程,通过分析可知其精度符合反演要求.在贝叶斯理论框架下,建立了包含正则化约束的弹性阻抗反演方法,在此基础上直接提取Russell流体项.该方法可在缺少大角度叠前地震资料的情况下进行叠前直接反演得到流体因子,减少传统方法带来的累积误差.模型试算表明,该方法具有较好的准确度和稳定性.实际工区应用取得了良好的效果,表明该方法有实用性.Based on the poroelastic media theory and the incident-angle approximation,a twoterm AVO approximation including the Russell fluid term was proposed.A new two-term elastic impedance equation was derived according to the new AVO approximation.The accuracy of the elastic impedance equation was proved to be suitable for inversion.Based on the Bayesian theory,a method of elastic impedance inversion with regularized constraint terms was established.Fluid factor could be extracted directly from the inverted elastic impedance.The direct extraction method decreases the cumulative errors and provides better results.Synthetic test shows the accuracy and robustness of this method.Real data tests demonstrate the applicability and validity.

关 键 词：流体阻抗 入射角方程 贝叶斯理论 小角度反演 

分 类 号：P631[天文地球—地质矿产勘探]