大地电磁测深与地震初至波走时交叉梯度反演

doi:10.13278/j.cnki.jjuese.201503304

吉林大学学报(地球科学版) ›› 2015, Vol. 45 ›› Issue (3): 952-961.doi: 10.13278/j.cnki.jjuese.201503304

大地电磁测深与地震初至波走时交叉梯度反演

李桐林¹, 张镕哲¹, 朴英哲^1,2

1. 吉林大学地球探测科学与技术学院, 长春 130026;
2. 金策工业综合大学资源探测工学系, 朝鲜平壤 999093

收稿日期:2014-09-13 发布日期:2015-05-26
作者简介:李桐林(1962),男,教授,博士生导师,主要从事电磁法理论和应用研究,E-mail:litl@jlu.edu.cn。
基金资助:
中国地质调查局项目([2013]01-060-004);国家重大科学仪器设备开发专项项目(2011YQ05006009)

Joint Inversion of Magnetotelluric and First-Arrival Wave Seismic Traveltime with Cross-Gradient Constraints

Li Tonglin¹, Zhang Rongzhe¹, Pak Yongchol^1,2

1. College of Geo-Exploration Science and Technology, Jilin University, Changchun 130026, China;
2. Resource Exploration and Engineering Department, Kimchaek University of Technology, Pyongyang 999093, Korea

Received:2014-09-13 Published:2015-05-26

摘要/Abstract

摘要：

在地球物理勘探过程中,观测数据有限且存在误差,导致反演结果存在非唯一解。为了解决非唯一性问题,笔者研究了交叉梯度数学理论,实现了用交叉梯度约束2D 大地电磁和地震初至波走时的联合反演,并建立了2个模型。通过各自模型实验和不同模型间的对比,证明了交叉梯度联合反演比单独反演修复几何形态和物性参数的效果好,且交叉梯度与岩石物性无关;利用得到的交叉梯度图进一步证明了联合反演模型相似度高,也从交叉绘图中得到联合反演的物性关系更好的结论,反向证明了联合反演的正确性。

关键词: 大地电磁测深, 地震初至波走时, 交叉梯度, 联合反演

Abstract:

In the process of geophysical exploration, observation data are limited and errors exist, leading to the presence of non-unique inversion results. In order to solve the problem of non-uniqueness, the authors study the mathematical theory of cross-gradient, and achieve the joint inversion of 2D magnetotelluric and first-arrival wave seismic traveltime with cross-gradient. At the same time, we establish two models. Through test of each model and comparison between the two models, it is proven not only that the result of the cross-gradient joint inversion is better than the single inversion in remediation on geometry and physical property parameters, but also that the cross-gradient is independent from the petro-physical properties. Further, the cross-gradient figure evidences the high similarity of the joint inversion models, and the cross-plot of joint inversion presents a better correlation with physical properties. These, in turn, prove the validity of the joint inversion.

Key words: magnetotelluric, first-arrival wave seismic traveltime, cross-gradient, joint inversion

中图分类号:

P631.3

李桐林, 张镕哲, 朴英哲. 大地电磁测深与地震初至波走时交叉梯度反演[J]. 吉林大学学报(地球科学版), 2015, 45(3): 952-961.

Li Tonglin, Zhang Rongzhe, Pak Yongchol. Joint Inversion of Magnetotelluric and First-Arrival Wave Seismic Traveltime with Cross-Gradient Constraints[J]. Journal of Jilin University(Earth Science Edition), 2015, 45(3): 952-961.

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大地电磁测深与地震初至波走时交叉梯度反演

Joint Inversion of Magnetotelluric and First-Arrival Wave Seismic Traveltime with Cross-Gradient Constraints

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