Enhancement the VES models based on the TEM measurements and the application of static shift corrections.: case study from Egypt

Osman, Maher M.; El-Qady, Gad; Fattah, Th. Abdel; Rashed, Mohamed; Mohamdeen, M.

doi:10.1080/20909977.2021.1915080

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…This section discusses the continuity of MT data processing after static shift correction. It is vital to solve the static shift effect prior to inversion as it would leads to incorrect resistivity estimation and erroneous subsurface modelling (Delhaye et al, 2017;Osman et al, 2021). After recovering the actual level of resistivity curve, the data became the input for MT inversion process in generating 2D resistivity inversion model which depicts the geology of the subsurface.…”

Section: Mt Inversionmentioning

confidence: 99%

Novel approach in static shift correction for magnetotellurics data using 2D electrical resistivity imaging

Rahman,

muztaza,

Rosli

et al. 2024

Preprint

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Magnetotellurics (MT) method utilizes lightning activities and solar wind interactions as electromagnetic sources in measuring resistivity distribution to great depths. Static shift is a common problem in MT where actual MT data is shifted higher or lower in logarithmic scale but maintains the same apparent resistivity (ρA) curve. Currently, MT static shift is corrected using vertical electrical sounding (VES) and transient electromagnetic (TEM) data, which give ρA data in 1D that does not depicts subsurface materials precisely. In contrast, 2D electrical resistivity imaging (2D ERI) provides data in lateral and vertical directions; therefore, better images the ground with higher sensitivity to inhomogeneity. Additionally, true resistivity (ρT) obtained after inversion provides a better representation of the Earth than ρA. Therefore, this study develops a new static shift correction using 2D ERI ρT data. 2D ERI lines were conducted across MT stations to obtain the best resistivity model and extract ρA and ρT values beneath MT stations as two data groups for static shift correction. Resistivity data from 2D ERI was employed to constrained MT phase inversion to obtain the actual MT response for every MT station. Resistivity curve from MT survey was then shifted to the actual response to achieve its true resistivity level. The results obtained from ρA and ρT shifts yielded RMS values of < 11.3 and < 6.9 respectively. The lower RMS values indicates that the ρT shifts is more effective in removing static shift effect. Qualitatively, model without static shift correction yielded illogical resistivity values while the other models were acceptable. This showcases that the performance of novel MT static shift correction using ρT surpasses conventional method and is reliable for future usage.

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Section: Mt Inversionmentioning

confidence: 99%

Novel approach in static shift correction for magnetotellurics data using 2D electrical resistivity imaging

Rahman,

muztaza,

Rosli

et al. 2024

Preprint

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“…The general procedure involves probing and monitoring the response of surficial materials to the passage of an impressed electric current flowing through them. Details of the theory and practical procedures can be found in Telford et al [62], Zhdanov and Keller [63], and Keller and Frischknecht [64].…”

Section: Vertical Electrical Soundingmentioning

confidence: 99%

Direct Detection of Groundwater Accumulation Zones in Saprock Aquifers in Tectono-Thermal Environments

Akpan,

Ekwok,

Ben

et al. 2023

Water

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Some vertical electrical sounding (VES) data from tectono-thermal environments usually plot anomalously on a VES curve, thereby distorting the curve trend at the points of their occurrence. These datasets usually plot noisily in the form of a sudden rise and drop in electrical resistivity values. They constitute abnormal datasets that are usually deleted to recover trends and consequently develop confidence in both the datasets and the modelling and interpretational processes. This study was conducted to assess their origin and consequently gain an understanding of their contributions to groundwater accumulation and transmission in saprock aquifers. The results, supported by co-located drilling and pumping test data, show that these datasets are indicators of subsurface conditions where high-resistivity unconformal structures directly overlie saturated (low-resistivity) porous media, provided that the resistivity of the first breakout point is less than those from subsequent points. Remote sensing data reveal that these types of curves are common in hard rock and metasedimentary environments. Borehole groundwater yields can also be assessed qualitatively from the number and trend of breakoff points. The integrity of the breakoff points must be affirmed by using more sensitive equipment for data acquisition and repeating the measuring process using different potential electrode separations and—where possible—VES profile orientation.

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Geophysical techniques and geomatics-based mapping for groundwater exploration and sustainable development at Sidi Barrani Area, Egypt

Mohamaden,

Araffa,

Taha

et al. 2024

Egyptian Journal of Aquatic Research

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Enhancement the VES models based on the TEM measurements and the application of static shift corrections.: case study from Egypt

Cited by 3 publications

References 19 publications

Novel approach in static shift correction for magnetotellurics data using 2D electrical resistivity imaging

Novel approach in static shift correction for magnetotellurics data using 2D electrical resistivity imaging

Direct Detection of Groundwater Accumulation Zones in Saprock Aquifers in Tectono-Thermal Environments

Geophysical techniques and geomatics-based mapping for groundwater exploration and sustainable development at Sidi Barrani Area, Egypt

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