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Appraisal of a galvanic-source transient electromagnetic method for hazardous water structures beyond tunnel sidewall
In tunnel construction, hazardous water structures pose significant risks. The transient electromagnetic method (TEM) is widely used for advanced...
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Experimental study on transient electromagnetic conductivity logging in cased well
A cased well model consists of a coaxial tank and casing, which houses coaxially installed transmitting and receiving coils. The transmitting coil is...
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Application of the small fixed-loop transient electromagnetic method in detecting grottoes seepage channel
Grotto statues are carved or painted in stone mountain grotto niches, vulnerable to various environmental changes. Seepage channels in grottoes are...
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A Novel Calculation Method of Transient Electromagnetic Resistivity Logging Through Casing
A novel calculation method of transient electromagnetic (TEM) resistivity logging through casing is proposed. The traditional through casing...
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3-D transient electromagnetic inversion based on explicit finite-difference forward modeling
We propose a 3-D transient electromagnetic inversion method based on explicit finite-difference forward modeling. For forward modeling, we calculate...
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Experimental study of small fixed-loop transient electromagnetic method for characterizing water-bearing structures in tunnels
Understanding the response of the transient electromagnetic method (TEM) to bad geological bodies is essential to improve the accuracy of tunnel...
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Sampling rate and necessary conditions for geoelectric structure reconstruction in transient electromagnetic exploration
To improve the detection precision of the transient electromagnetic method, dense observation points and windows are necessary. However, to keep the...
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Instantaneous inversion of transient electromagnetic data using machine learning
Inverse problems are typically tackled using deterministic optimization methods that may become trapped in a local minimum or probabilistic methods...
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Statistical modeling of three-dimensional redox architecture from non-colocated redox borehole and transient electromagnetic data
Agricultural nitrate pollutants infiltrate into the subsurface and contaminate groundwater. The redox environment in the subsurface is important for...
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Transient Electromagnetic Smoke Ring Due to a Grounded-Wire Source
The concept of a “smoke ring” in electromagnetic fields can be used to describe the spatial distribution and diffusion of electromagnetic fields with...
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Transient Electromagnetic Process in the Waters of the Sea Shelf with Axial and Equatorial Electric Installations and a Field Experiment
Abstract —A change in the non-stationary electromagnetic (EM) signal over the conducting polarizable Earth covered by sea water on measuring lines...
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Using Pseudo-Random Code Sequences for Improving the Efficiency of Near-Field Transient Electromagnetic Sounding on the Arctic Shelf
Abstract —Numerical modelling was done with the aim to evaluate the efficiency of applying pseudo-random sequences of current pulses (pseudo-noise...
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Multi-turn small-loop transient electromagnetic data processing using constraints from borehole and electrical resistivity tomography data
The traditional large-loop transient electromagnetic method (TEM) is strongly affected by the large terrain undulations and limited working space in...
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Pipeline positioning by the surface-to-borehole electromagnetic induction method in a clayey deposit
Underground pipelines are the lifelines of a modern city. The precise positioning of underground pipelines is essential to avoid pipeline damage...
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Advancements in Controlled Source Electromagnetic Methods for Prospecting Unconventional Hydrocarbon Resources in China
Globally, unconventional hydrocarbons, known for the symbiosis of their hydrocarbon source and reservoir, pose significant seismic exploration...
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Self-adaptive inversion method of electromagnetic-propagation resistivity logging while drilling data
Because of the constraint mode of the inversion objective function in the traditional resistivity-inversion method of electromagnetic-propagation...
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Transient Responses in Shallow Depth Electromagnetic Studies
Abstract —Current turn-off processes in ungrounded antennas used in shallow depth transient electromagnetic (TEM) investigation have been studied...
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Study on the Coincident-Loop Transient Electromagnetic Method in Seafloor Exploration—Taking Jiaodong Polymetallic Mine as a Model
The transient electromagnetic (TEM) method becomes more urgent than ever for marine exploration due to abundant resource reserves and the increasing...
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Assessment of borehole geophysical logging and DC resistivity/transient electromagnetic methods for subsurface map** in Wadi Feiran, Sinai, Egypt
Discrete direct current (DC) resistivity sounding still remains a convenient and popular tool for groundwater studies in wadi environments in Egypt,...
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Exploration of anomaly separation technology of wide-field electromagnetic method
To improve the accuracy of data processing and interpretation, effective suppression of the regional background field and extraction of the local...