电阻率层析成像非线性反演  

Nonlinear inversion for electrical resistivity tomography

作　　者：闫永利[1] 陈本池 赵永贵[1] 陈赟[1] 马晓冰[1] 孔祥儒[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国石油石化总公司技术部,北京100029

出　　处：《地球物理学报》2009年第3期758-764,共7页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目(40774070,40474048);中国地质大学(北京)“地下信息探测技术与仪器”教育部重点实验室开放课题(GDL0604)资助

摘　　要：本文通过概率成像法、α中心法、遗传算法的有机结合,实现了2-D 电阻率层析成像非线性反演.首先,根据概率成像结果指示出的2-D 地质异常体的相对电性和大致分布范围,合理地确定出α中心的位置与强度系数的变化范围.其次,以α中心法作为2-D地电结构的正演手段,采用遗传算法反演出各α中心的强度系数.在此基础上,应用α中心法重新构建出地下介质电阻率的分布.通过对均匀半空间中赋存2-D 地质异常体模型的反演试验,获得了令人满意的结果.The paper develops a 2-D tomography survey by using probability distribution scopes of anomalous bodies nonlinear inversion approach for electrical resistivity tomography, α centers, and genetic algorithm. First, the and the positions as well as coefficient ranges of αcenters are determined based on the results of multiple superimposed probability tomography. Secondly, we use α centers method to numerical simulation of 2 D electrical structures and the intensity coefficients of α centers are obtained by the genetic inversion algorithm. Last, the resistivity distribution is reconstructed by using a center method. To test the effectiveness of the approach, several models of 2-D anomalous bodies imbedded in half homogeneous space are used to implement inversion and the results are satisfactory.

关 键 词：电阻率层析成像 概率成像 a中心法 遗传算法 非线性反演 

分 类 号：P631[天文地球—地质矿产勘探]