基于支持向量机的非线性弹性阻抗反演方法  

Non-linear elastic impedance inversion method supported by vector machines

作　　者：苏建龙[1,2] 米鸿 王彦春[2] 张丰麒[2] 唐静[4] 

机构地区：[1]中国石化勘探南方分公司研究院,四川成都610041 [2]中国地质大学(北京)地球物理与信息技术学院,北京100083 [3]川庆钻探工程公司地球物理勘探公司重庆经理部,重庆402160 [4]中国科学院地质与地球物理研究所,北京100029

出　　处：《石油地球物理勘探》2014年第4期751-758,6,共8页Oil Geophysical Prospecting

基　　金：国家"863"项目(2013AA064201)资助

摘　　要：常规弹性阻抗反演是由Zoeppritz方程近似式组建线性方程组并求解,但是弹性阻抗与弹性参数是一种完全非线性关系。本文把支持向量机方法引入弹性阻抗反演过程中,提出一种新的非线性弹性阻抗反演方法:1在基于精确Zoeppritz方程正演角道集基础上生成部分叠加剖面并求取弹性阻抗;2运用支持向量机方法训练弹性阻抗与弹性参数的非线性关系;3由此非线性关系反演弹性参数。将该方法用于模型数据和实际资料,反演结果表明支持向量机的非线性弹性阻抗反演保持了常规弹性阻抗反演稳定性的同时提高了弹性参数的反演精度,且克服了常规波阻抗反演解决不了的远炮检距数据或弹性参数纵向变化大等缺陷。Conventional elastic impedance inversion of elastic parameters is a process of establishing linear equations by the approximate formula,such as Connolly approximate formula,and then solving the equations.However,the relationship between elastic impedance and elastic parameters are completely non-linear.Therefore,we propose in this paper a new non-linear elastic impedance inversionmethod supported by vector machines.There are three steps in this method:1Calculate elastic impedance on exact Zoeppritz's equations after partial angle gather stacking;2Establish nonlinear relationship between elastic impedance and elastic parameters applying a training method supported by vector machines;3Calculate the elastic parameters according to this relationship.Application results in model synthetic data and field data show that maintaining the stability as conventional impedance inversion methods,this method can greatly improves inversion accuracy especially for far-offset data or violent variation of elastic parameters.

关 键 词：非线性 弹性阻抗反演 精确Zoeppritz方程 支持向量机 

分 类 号：P631[天文地球—地质矿产勘探]