必须声明标量变量 "@Script_ID"。 电性源短偏移距瞬变电磁场扩散规律三维数值模拟-《地球科学与环境学报》
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[1]常江浩,薛国强*.电性源短偏移距瞬变电磁场扩散规律三维数值模拟[J].地球科学与环境学报,2020,42(06):711-721.[doi:10.19814/j.jese.2020.07048]
 CHANG Jiang-hao,XUE Guo-qiang*.Three-dimensional Numerical Simulation of Diffusion Law of Short-offsetGrounded-wire Transient Electromagnetic Field[J].Journal of Earth Sciences and Environment,2020,42(06):711-721.[doi:10.19814/j.jese.2020.07048]
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第42卷
期数:
2020年第06期
页码:
711-721
栏目:
电磁法勘探专辑
出版日期:
2020-11-15

文章信息/Info

Title:
Three-dimensional Numerical Simulation of Diffusion Law of Short-offset Grounded-wire Transient Electromagnetic Field
文章编号:
1672-6561(2020)06-0711-11
作者:
常江浩1234薛国强1235*
1. 中国科学院地质与地球物理研究所 中国科学院矿产资源研究重点实验室,北京 100029; 2. 中国科学院大学 地球与行星科学学院,北京 100049; 3. 中国科学院地球科学研究院,北京 100029; 4. 河北地质大学 河北省战略性关键矿产资源重点实验室,河北 石家庄 050031; 5. 长安大学 地球物理场多参数综合 模拟实验室(中国地球物理学会重点实验室),陕西 西安 710054
Author(s):
CHANG Jiang-hao1234 XUE Guo-qiang1235*
1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China; 3. Innovation Academy of Earth Science, Chinese Academy of Sciences, Beijing 100029, China; 4. Hebei Key Laboratory of Strategic Critical Mineral Resources, Hebei GEO University, Shijiazhuang 050031, Hebei, China; 5. Integrated Geophysical Simulation Lab(Key Laboratory of Chinese Geophysical Society), Chang'an University, Xi'an 710054, Shaanxi, China
关键词:
地球物理学 瞬变电磁法 电性源 短偏移距 数值模拟 三维异常体 扩散规律 正演模拟
Keywords:
geophysics transient electromagnetic method grounded-wire short-offset numerical simulation three-dimensional anomalous body diffusion law forward modeling
分类号:
P631
DOI:
10.19814/j.jese.2020.07048
文献标志码:
A
摘要:
电性源短偏移距瞬变电磁法(SOTEM)采用近源探测形式,极大地提高了信号强度,目前对电性源短偏移距瞬变电磁响应特征的研究主要基于一维模型,且主要讨论电场Ex分量和磁场Hz分量的响应特征和探测能力,不利于复杂目标体的精细探查。基于以上问题,采用三维时域有限差分法,对电性源短偏移距瞬变电磁场在地层中的扩散规律进行了模拟,并研究了三维异常体对电性源短偏移距瞬变电磁场扩散的影响。结果表明:电场Ex分量的正极值区域主要集中在发射源附近,并随着时间的推移逐渐向下扩散; 电场Ey分量正极值区域和负极值区域分别位于发射源两端,并随着时间的推移逐渐向下、向外扩散; 电场Ez分量在地层分界面产生跃变; 磁场Hx分量正极值区域和负极值区域分别位于发射源两端,并随着时间的推移逐渐向下、向外扩散; 磁场Hy分量上部为负值区域,下部为正值区域,说明Hy分量也会受到返回电流影响; 磁场Hz分量极值区域主要位于发射源下方,并随着时间的推移逐渐向下移动; 对于三维异常体,电场Ex分量和磁场Hy分量的灵敏区域位于异常体上方,而电场Ey分量和磁场Hx分量的灵敏区域位于异常体外部,且分布在异常体四周,磁场Hz分量的灵敏区域位于异常体两侧(靠近发射源和远离发射源位置),说明电性源短偏移距瞬变电磁场的5个分量对三维异常体的灵敏区域不同,不同的分量应选择不同的区域进行观测。
Abstract:
Short-offset grounded-wire transient electromagnetic method(SOTEM)has considerably improved the signal intensity by using the form of near-source detection. The present researches on SOTEM responses are mainly based on 1D models and explore the response characteristics and detection abilities of two components: electric field Ex and magnetic field Hz, which are not conducive to the accurate exploration of complex targets. Based on the above-mentioned problems, a three-dimensional(3D)finite-difference time-domain(FDTD)was employed to simulate the diffusion pattern of SOTEM field in strata and the influence of 3D anomalous body on the diffusion of SOTEM field. The results show that the positive extreme value area of electric field Ex component mainly appears nearby the transmitting source, and diffuses gradually downward with time; the positive extreme value area and negative extreme value area of electric field Ey component are mainly located at two ends of the transmitting source, and diffuse gradually downward and outward with time; the electric field Ez component undergoes jump at strata boundary; the positive extreme value area and negative extreme value area of magnetic field Hx component are respectively located at two ends of the transmitting source, and diffuse gradually downward and outward with time; the upper part and lower part of magnetic field Hy component are negative value area and positive value area, respectively, indicating that Hy component will also be affected by the return current; the extreme value area of magnetic field Hz component is mainly below the transmitting source, and gradually moves downward with time; for the 3D anomalous body, the sensitivity areas of electric field Ex and magnetic field Hy components are rightly above the anomalous body, while the sensitivity areas of electric field Ey and magnetic field Hx components are outside the anomalous body and distribute around it, and the sensitivity areas of magnetic field Hz component are on both sides of the anomalous body(close to transmitting source, and distant from transmitting source, respectively). It shows that the five components of SOTEM field have different sensitivity areas to the 3D anomalous body, and different components should be observed in different areas.

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相似文献/References:

[1]薛国强,闫述,底青云,等.多道瞬变电磁法(MTEM)技术分析[J].地球科学与环境学报,2015,37(01):94.
 XUE Guo-qiang,YAN Shu,DI Qing-yun,et al.Technical Analysis of Multi-transient Electromagnetic Method[J].Journal of Earth Sciences and Environment,2015,37(06):94.
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备注/Memo

备注/Memo:
收稿日期:2020-07-31; 修回日期:2020-09-14; 网络首发日期:2020-11-18投稿网址:http:∥jese.chd.edu.cn/
基金项目:中国科学院科研仪器设备研制项目(YJKYYQ20190004); 国家自然科学基金项目(41830101); 中国博士后科学基金项目(2019M660043,2020M670442); 自然资源部煤炭资源勘查与综合利用重点实验室开放项目(KF2020-3)
作者简介:常江浩(1989-),男,河南叶县人,河北地质大学讲师,工学博士,博士后,E-mail:jhchang@126.com。
*通讯作者:薛国强(1966-),男,山西运城人,中国科学院地质与地球物理研究所研究员,博士研究生导师,理学博士, E-mail:ppxueguoqiang@163.com。
更新日期/Last Update: 2020-12-20