基于弹性阻抗反演理论的泊松比反演方法研究

Poissons ratio inversion method based on elastic impedance inversion theory

(中国石油大学(华东)地球资源与信息学院,山东青岛266555)

Gui Jinyong,College of Geo-resources and Information,China University of Petroleum (East China),Qingdao 266555,China

实际应用中泊松比主要通过间接反演的方式获取，其累积误差明显，针对这一不足,基于弹性阻抗反演理论,在总结出常用弹性阻抗方程的
通用表达式和岩性参数通用提取方法的基础上,推导出了一种新的AVO近似式,进而提出一种包含有泊松比参数项的新的弹性阻抗方程。模型试验
与实际应用结果表明,利用新的弹性阻抗方程进行弹性阻抗反演直接得到泊松比的方法与传统利用纵、横波速度转化计算间接得到泊松比的方法
相比,减少了误差的累积并且稳定性和抗噪性均得到了提高,泊松比精度更高。

In actual application,Poissons ratio is mainly obtained from indirect inversion,and its cumulative error is obvious.Aiming
at the problem,based on elastic impedance inversion theory,firstly,the general formula of conventional elastic impedance
equation and general extraction method of lithologic parameters;then,a new AVO approximation was derived;thirdly,a new
elastic impedance equation involving Possions ratio parameters was proposed.Model testing and actual application results
show that elastic impedance inversion by using the new AVO approximation can directly obtain Possions ratio,which reduced
cumulative error,and improved the stability and anti-noising ability,moreover,the accuracy of the Possions ratio is higher.

10.3969/j.issn.1000-1441.2001.05.006