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The non-static effect of near-surface inhomogeneity on CSAMT data

文献类型：期刊论文

作者Lei, Da1,3; Fayemi, Busayo2; Yang, Liangyong1,3; Meng, Xiaohong2
刊名JOURNAL OF APPLIED GEOPHYSICS
出版日期2017-04-01
卷号139页码:306-315
关键词Near-surface Effect Static Effect Static Correction Csamt Inversion
ISSN号0926-9851
DOI10.1016/j.jappgeo.2017.03.003
文献子类Article
英文摘要Controlled source audio-frequency magnetotelluric (CSAMT) method has several advantages over magnetotelluric (MT) method, which includes the recording of lower noise signal and higher resolution data. However, CSAMT field data can still be distorted by the effect of near surface inhomogeneous body. It may be confused with static effect just like in MT, if three-dimensional subsurface geological body is buried under the receiver. Traditionally, the method used in static correction is adopted similar to that used in MT method for many years. In comparison, MT are the natural electric and magnetic fields in the frequency range of 0.0001 Hz to 500 Hz, while CSAMT fields are applied at frequencies ranging from 0.1 to 10 kHz. Hence, in this paper, the non-static effect of near-surface inhomogeneity in CSAMT was simulated through theoretical modeling and we summarized its characteristics. If the skin depth is much larger than the size of the near-surface inhomogeneous body that is close to the measurement point, the anomalous body causes a static effect which is represented by vertical shift in apparent resistivity curves for all frequencies from their expected values, but when the skin depth is much smaller than the size of the near-surface inhomogeneous body in the vicinity of the measurement point, the apparent resistivity curve at high frequencies remains unchanged, while at lower frequencies shift in value is observed. The near-surface effect may be confused with static effect in data processing; however, it cannot be corrected using previous static correction methods, but by using the two-dimensional inversion method. Hence, for such CSAMT data, both effective processing technique and inversion process is of great significance. (C) 2017 Elsevier B.V. All rights reserved.
WOS关键词DIPOLE SOURCE ; MAGNETOTELLURICS ; PRINCIPLES
WOS研究方向Geology ; Mining & Mineral Processing
语种英语
WOS记录号WOS:000399269400027
出版者ELSEVIER SCIENCE BV
资助机构Wireless Electromagnetic method (WEM) Program of the National Development and Reform Commission - China Geological Survey (CGS)(1212010660302) ; National Key Research and Development Program of China(2016YFC0600101 ; 2016YFC0601102 ; 2016YFC0601104) ; Wireless Electromagnetic method (WEM) Program of the National Development and Reform Commission - China Geological Survey (CGS)(1212010660302) ; National Key Research and Development Program of China(2016YFC0600101 ; 2016YFC0601102 ; 2016YFC0601104) ; Wireless Electromagnetic method (WEM) Program of the National Development and Reform Commission - China Geological Survey (CGS)(1212010660302) ; National Key Research and Development Program of China(2016YFC0600101 ; 2016YFC0601102 ; 2016YFC0601104) ; Wireless Electromagnetic method (WEM) Program of the National Development and Reform Commission - China Geological Survey (CGS)(1212010660302) ; National Key Research and Development Program of China(2016YFC0600101 ; 2016YFC0601102 ; 2016YFC0601104)
源URL[http://ir.iggcas.ac.cn/handle/132A11/52962]  
专题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
通讯作者Lei, Da
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
2.China Univ Geosci, Beijing 100083, Peoples R China
3.Univ Chinese Acad Sci, Beifing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Lei, Da,Fayemi, Busayo,Yang, Liangyong,et al. The non-static effect of near-surface inhomogeneity on CSAMT data[J]. JOURNAL OF APPLIED GEOPHYSICS,2017,139:306-315.
APA Lei, Da,Fayemi, Busayo,Yang, Liangyong,&Meng, Xiaohong.(2017).The non-static effect of near-surface inhomogeneity on CSAMT data.JOURNAL OF APPLIED GEOPHYSICS,139,306-315.
MLA Lei, Da,et al."The non-static effect of near-surface inhomogeneity on CSAMT data".JOURNAL OF APPLIED GEOPHYSICS 139(2017):306-315.

入库方式： OAI收割

来源：地质与地球物理研究所

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