Research output: Contribution to journal › Article › peer-review
3D controlled-source electromagnetic inversion in the radio-frequency band. / Смирнова, Мария; Шлыков, Арсений Андреевич; Askhari, Shiva ; Тезкан, Бюэлент ; Сараев, Александр Карпович; Yogeshwar, Pritam; Смирнов, Максим .
In: Geophysics, Vol. 88, No. 1, 01.01.2023, p. E1-E12.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - 3D controlled-source electromagnetic inversion in the radio-frequency band
AU - Смирнова, Мария
AU - Шлыков, Арсений Андреевич
AU - Askhari, Shiva
AU - Тезкан, Бюэлент
AU - Сараев, Александр Карпович
AU - Yogeshwar, Pritam
AU - Смирнов, Максим
N1 - Publisher Copyright: © 2023 Society of Exploration Geophysicists.
PY - 2023/1/1
Y1 - 2023/1/1
N2 - The classical radio-magnetotelluric (RMT) method is nowadays routinely applied to various environmental, engineering, and exploration problems. The technique uses radio transmitters broadcasting in the frequency range of 10 kHz to 1 MHz, and the measurements are carried out in the far field. The well-known disadvantages of RMT are a lack of robust radio transmitters in remote areas; the absence of transmitters broadcasting below 10 kHz, which limits the penetration depth; and a possible low signal-to-noise ratio. To overcome these difficulties, controlled sources can be used (controlled-source RMTs [CSRMTs]). We extend the CSRMT method to perform measurements not only in the far field but also in the transition zone. In CSRMT practice, it often is challenging to maintain far-field conditions for logistical reasons. Therefore, part of the measured data contains signatures of the source field, which cannot be interpreted with magnetotelluric software. In addition, the source placed directly in the survey area allows us to increase the signal-to-noise ratio and resolution. Such CSRMT in the transition zone is, in fact, a controlled-source electromagnetic method but with full impedance tensor and tipper vector transfer functions. We develop new procedures for the 3D modeling and inversion of the tensor radio-frequency data measured in the transition zone of two perpendicular horizontal electric dipole sources. In this case, the geometry of the source must be considered in the forward modeling. The developed modeling and inversion software is tested on a synthetic 3D model. The 3D resistivity models derived from the real data confirm the geologic settings and are consistent with the available borehole information. Therefore, we conclude that the CSRMT approach extended to include the source field is feasible and that the developed procedures are reliable.
AB - The classical radio-magnetotelluric (RMT) method is nowadays routinely applied to various environmental, engineering, and exploration problems. The technique uses radio transmitters broadcasting in the frequency range of 10 kHz to 1 MHz, and the measurements are carried out in the far field. The well-known disadvantages of RMT are a lack of robust radio transmitters in remote areas; the absence of transmitters broadcasting below 10 kHz, which limits the penetration depth; and a possible low signal-to-noise ratio. To overcome these difficulties, controlled sources can be used (controlled-source RMTs [CSRMTs]). We extend the CSRMT method to perform measurements not only in the far field but also in the transition zone. In CSRMT practice, it often is challenging to maintain far-field conditions for logistical reasons. Therefore, part of the measured data contains signatures of the source field, which cannot be interpreted with magnetotelluric software. In addition, the source placed directly in the survey area allows us to increase the signal-to-noise ratio and resolution. Such CSRMT in the transition zone is, in fact, a controlled-source electromagnetic method but with full impedance tensor and tipper vector transfer functions. We develop new procedures for the 3D modeling and inversion of the tensor radio-frequency data measured in the transition zone of two perpendicular horizontal electric dipole sources. In this case, the geometry of the source must be considered in the forward modeling. The developed modeling and inversion software is tested on a synthetic 3D model. The 3D resistivity models derived from the real data confirm the geologic settings and are consistent with the available borehole information. Therefore, we conclude that the CSRMT approach extended to include the source field is feasible and that the developed procedures are reliable.
KW - 3D
KW - CSEM
KW - electromagnetics
KW - magnetotelluric
KW - near surface
UR - https://www.mendeley.com/catalogue/75d83548-8ba8-3039-bc7d-b867b5c96336/
UR - http://www.scopus.com/inward/record.url?scp=85141126099&partnerID=8YFLogxK
U2 - 10.1190/geo2021-0626.1
DO - 10.1190/geo2021-0626.1
M3 - Article
VL - 88
SP - E1-E12
JO - Geophysics
JF - Geophysics
SN - 0016-8033
IS - 1
ER -
ID: 99400783