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物探与化探  2020, Vol. 44 Issue (6): 1415-1419    DOI: 10.11720/wtyht.2020.1517
  方法研究·信息处理·仪器研制 本期目录 | 过刊浏览 | 高级检索 |
瞬变电磁的逆时偏移成像方法
陈紫静1(), 陈清礼2
1.中国石化西北油田分公司采油一厂,新疆 轮台 841600
2.长江大学 油气资源与勘探技术教育部重点实验室,湖北 武汉 430100
Transient electromagnetic inverse time migration imaging method
CHEN Zi-Jing1(), CHEN Qing-Li2
1. No. 1 Oil Production Plant of Northwest Oil Field Company, Sinopec, Luntai 841600, China
2. School of Geophysics and Petroleum, Yangtze University, Wuhan 430100, China
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摘要 

本文研究了中心回线瞬变电磁测深的逆时偏移成像问题。针对电磁波在大地中的传播速度远小于真空中的光速这个特性,设计了一种适用于中心回线观测方式瞬变电磁测深的逆时偏移成像的算法,其核心思想是根据不同观测点在成像点相同时刻的波场值的叠加,进而获得成像点的总波场值。基于该算法,对一条实测的中心回线瞬变电磁测深资料进行了逆时偏移成像处理,结果表明,逆时偏移成像结果与实际情况比较吻合,得到了比较好的处理效果。因此,逆时偏移成像方法是瞬变电磁测深法的一种比较有效的资料处理方法。

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陈紫静
陈清礼
关键词 电法勘探瞬变电磁测深逆时偏移成像电磁波速度    
Abstract

In this paper, inverse time migration imaging of center loop transient electromagnetic sounding is studied. In view of the fact that the propagation velocity of electromagnetic wave in the earth is much lower than that of the speed of light in the vacuum, an inverse time migration imaging algorithm is designed which is suitable for transient electromagnetic sounding in the center loop observation configuration. The core idea of the algorithm is to obtain the total wave field value of the imaging point according to the superposition of the wave field value of different observation points at the same time of the imaging point. Based on this algorithm, inverse time migration imaging was performed on a measured center loop transient electromagnetic sounding data. It is shown that the results of inverse time migration imaging are in good agreement with the actual situation and can obtain better processing effect. Therefore, inverse time migration imaging is an effective data processing method for transient electromagnetic sounding.

Key wordselectrical prospecting    transient electromagnetic sounding    inverse time migration imaging    electromagnetic velocity
收稿日期: 2019-11-02      出版日期: 2020-12-29
ZTFLH:  P631  
基金资助:国家重点研发计划项目(2018YFC060330502)
作者简介: 陈紫静(1990-),桂林理工大学硕士研究生毕业,主要从事地球物理的研究工作。Email:845237768@qq.com
引用本文:   
陈紫静, 陈清礼. 瞬变电磁的逆时偏移成像方法[J]. 物探与化探, 2020, 44(6): 1415-1419.
CHEN Zi-Jing, CHEN Qing-Li. Transient electromagnetic inverse time migration imaging method. Geophysical and Geochemical Exploration, 2020, 44(6): 1415-1419.
链接本文:  
http://www.wutanyuhuatan.com/CN/10.11720/wtyht.2020.1517      或      http://www.wutanyuhuatan.com/CN/Y2020/V44/I6/1415
电阻率
/(Ω·m)
频率
/Hz
精确速度
/(m·s-1)
近似速度
/(m·s-1)
以毫秒为单位的近似
速度/(m·ms-1)
与光速的比
10 0.001 316.23 316.23 0.32 1.05409E-06
10 0.01 1000.00 1000.00 1.00 3.33333E-06
10 0.1 3162.28 3162.28 3.16 1.05409E-05
10 1 10000.00 10000.00 10.00 3.33333E-05
10 10 31622.78 31622.78 31.62 0.000105409
10 100 100000.00 100000.00 100.00 0.000333333
10 1000 316227.68 316227.77 316.23 0.001054092
10 10000 999997.22 1000000.00 1000.00 0.003333324
100 0.001 1000.00 1000.00 1.00 3.33333E-06
100 0.01 3162.28 3162.28 3.16 1.05409E-05
100 0.1 10000.00 10000.00 10.00 3.33333E-05
100 1 31622.78 31622.78 31.62 0.000105409
100 10 100000.00 100000.00 100.00 0.000333333
100 100 316227.68 316227.77 316.23 0.001054092
100 1000 999997.22 1000000.00 1000.00 0.003333324
100 10000 3162189.82 3162277.66 3162.19 0.010540633
100 0.001 1000.00 1000.00 1.00 3.33333E-06
1000 0.01 10000.00 10000.00 10.00 3.33333E-05
1000 0.1 31622.78 31622.78 31.62 0.000105409
1000 1 100000.00 100000.00 100.00 0.000333333
1000 10 316227.68 316227.77 316.23 0.001054092
1000 100 999997.22 1000000.00 1000.00 0.003333324
1000 1000 3162189.82 3162277.66 3162.19 0.010540633
1000 10000 9997222.61 10000000.00 9997.22 0.033324075
Table 1  电磁波在介质中的传播速度
Fig.1  一个测点的实测感应电动势曲线
Fig.2  中心回线瞬变电磁法逆时偏移成像断面
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