张文伟^1,2,3,,
真齐辉^1,2,3,
底青云^1,2,3,,
1. 中国科学院地质与地球物理研究所 中国科学院页岩气与地质工程重点实验室, 北京 100029
2. 中国科学院地球科学研究院, 北京 100029
3. 中国科学院大学, 北京 100049


详细信息

作者简介: 张文伟, 男, 1989年生, 博士研究生, 主要从事地球电磁方法数据处理及应用.E-mail:wwzhang0421@163.com

通讯作者: 底青云, 女, 研究员, 主要从事地球电磁方法研究.E-mail:qydi@mail.iggcas.ac.cn

中图分类号: P631

收稿日期:2017-12-05
修回日期:2018-05-19
上线日期:2018-10-05

Study on MTEM frequency-domain ratio method and apparent resistivity calculation

ZHANG WenWei^1,2,3,,
ZHEN QiHui^1,2,3,
DI QingYun^1,2,3,,
1. Key Laboratory of Shale Gas and Geoengineering, CAS, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2. Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China
3. University of Chinese Academy of Sciences, Beijing 100049, China


More Information

Corresponding author: DI QingYun,E-mail:qydi@mail.iggcas.ac.cn

MSC: P631

--> Received Date: 05 December 2017
Revised Date: 19 May 2018
Available Online: 05 October 2018


摘要
摘要:视电阻率在电磁法勘探中起重要作用，可以作为初步解释结果，多通道瞬变电磁法通过大地脉冲响应的峰值时刻定义视电阻率.鉴于传统方法计算峰值时刻视电阻率需要恢复完整大地脉冲响应，本文通过研究大地脉冲响应及其频谱特征，提出一种新的频率域比值法.利用参考谱及其与一般谱的伸缩因子计算一般谱的峰值时刻，进而得到视电阻率.该方法只需大地脉冲响应单个频点幅度谱，从而不用估计整个大地脉冲响应.实际计算时，可以用大地脉冲响应多个频点幅度谱得到平均视电阻率.模拟数据与实测数据结果表明，在一维介质中，频率域比值法可以得到合理的视电阻率.
关键词: 多通道瞬变电磁法/
频率域比值法/
大地脉冲响应/
峰值时刻/
视电阻率

Abstract:Apparent resistivity has played a significant role in electromagnetic exploration and is able to be used for preliminary interpretation. Multi-channels transient electromagnetic method defines the apparent resistivity using the peak time of earth impulse response. However, traditional method evaluating peak-time apparent resistivity need to recover the entitle earth impulse response. In this paper, a new frequency-domain ratio method is proposed by studying characteristics of both the impulse response and its spectrum. Apparent resistivity is obtained by calculating the peak time of the general spectrum using reference spectrum and scaling factor between the reference spectrum and the general one. Only single-point spectrum is needed to get the peak time, instead of estimating the entitle earth impulse response. In practical, multiple-points spectrum can be exploited to obtain the averaged apparent resistivity. The results from synthetic and field data show that frequency-domain ratio method gives reasonable apparent resistivity in one dimensional media.
Key words:MTEM/
Frequency-domain ratio method/
Earth impulse response/
Peak time/
Apparent resistivity



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