摘要
鉴于常规AVO反演在CMP道集中进行,从而不可避免地导致AVO分析的精度降低。Robert利用谐波分解法获得角度道集,更适合AVO反演。本文改进了谐波分解法提取角度道集的算法,并在此基础上形成了利用炮集数据进行AVO反演的整体思路,可以概括为:从炮集数据出发,利用单程波保幅偏移使振幅得以保真和归位;运用在炮集数据上抽取角度道集的谐波分解算法,获得入射角和反射系数的准确对应关系;借助于Aki和Richards[7]的近似式,进行密度及纵横波速度等AVO属性的反演。通过实际数据算例验证了本文方法反演精度明显高于常规AVO分析结果。
Lowering the precision of AVO analysis is inevitable in conventional AVO inversion. Robert used harmonic decomposition method to get angle gather, which is more suitable for AVO inversion. The paper improved the algorithm taking angle gather by harmonic decomposition, forming the complete idea using CSP gather data for AVO inversion on that basis, which is summarized as follows: using one-way wave amplitude-preserved migration to make amplitude hi-fi and positioning; using the algorithm of harmonic decomposition sorting angle gather from CSP gather data to acquire accurate corresponding relationship between incident angle and reflectivity; the inversion of AVO attributes of density and P- and S-waves velocity etc is carried out by the aid of Aki and Richards' approximation. It is proved by practical data test that the precision of inversion by the method presented in the paper is obviously higher than that in conventional AVO analysis.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2009年第1期38-42,共5页
Oil Geophysical Prospecting
基金
国家重点基础研究发展计划(2007CB209505)
国家科技部国际部科技合作项目(2006DFB62030)联合资助
关键词
保幅偏移
反射系数
角度道集
AV0属性
反演
amplitude-preserved migration, reflectivity, angle gather, AVO attributes, inversion
