P-P波和P-SV波联合AVO反演研究  

Joint AVO inversion using P-P and P-SV seismic data

作　　者：冯晅[1] 舒梦珵[1] 王兆国[1] 刘财[1] 王典[1] 王世煜[1] 

机构地区：[1]吉林大学地球探测科学与技术学院,长春市130026

出　　处：《地球物理学进展》2008年第5期1556-1559,共4页Progress in Geophysics

摘　　要：目前转换波AVO(Amplitude Versus Offset)反演或纵波、转换波联合AVO反演是基于Aki等的反射系数近似公式,通常反演结果为上、下层速度比值和速度平均比值.本文在Shuey和郑晓东近似公式的基础上,运用最小平方算法,提出一种P-P波和P-SV波联合AVO反演下层介质纵、横波速度及泊松比的方案,并应用于双层含气砂岩模型上,误差在10%以内.此方案要求上、下层物性差别不大且入射角小于30°,但不需要速度比值为常数2的假设.The inversion of amplitude versus offset （AVO） is based on the approximate equation of the reflection coefficient, given by Aki et al , and usually the result of the inversion is the velocity ratio and the normalized velocity ratio at the both sides of the reflector. We propose a joint AVO inversion method that can get the Poisson＇s ratio and velocities of both P wave and SV wave using P P and P-SV seismic data. The method is based on the least squares solution of the approximate equation given by Shuey and Zheng Xiao dong. The method is tested in the model of twolayers gas sand and the deviation is less than 10%. There have two necessary assumptions that the incident angle is less than 30% degrees and the medium is similar on the both sides of the reflector. But we do not need the assumption that average interval velocity ratio is the constant 2.

关 键 词：P-SV波 P-P波 反射系数 AVO分析 联合反演 

分 类 号：P631[天文地球—地质矿产勘探]