Results 121 to 130 of about 284 (138)
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Borehole Transient Electromagnetics for Monitoring CO2 Sequestration in Saline Aquifers
Proceedings, 2011We present a technique for monitoring CO2 migration in an underground gas storage by using a surface-to-borehole transient electromagnetic method (BTEM). As the targeted reservoir consists of a saline aquifer, the main idea is to detect the changes in the electric conductivity that go along with the resistive CO2 displacing the conductive pore fluid ...
K. Spitzer +5 more
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CO2 Injection Monitoring Using Transient Electromagnetic in Ground-borehole Configuration
Journal of Environmental and Engineering Geophysics, 2018ABSTRACT Using geophysical methods, specifically transient electromagnetic (TEM), for CO2 monitoring is an effective way to detect CO2 diffusion. In this work, a multi-scale finite-difference time-domain (FDTD) algorithm was established to monitor CO2 by defining new iterative relations and approximating boundary conditions, which ...
Kai Li +3 more
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The influence of a conductive host on two-dimensional borehole transient electromagnetic responses
Geophysics, 1984Abstract We have computed transient borehole electromagnetic (EM) responses of two-dimensional (2-D) models using a direct and explicit finite-difference algorithm. The program computes the secondary electric field which is defined as the difference between the total field and the primary (half-space) field. The time derivative of the
Perry A. Eaton, Gerald W. Hohmann
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Journal of Environmental and Engineering Geophysics, 2020
ABSTRACT The transient electromagnetic method (TEM) for boreholes uses fixed source loops to launch at excavation faces, and is able to realize the mobile reception of secondary fields in the boreholes and detections of low-resistance hazards.
Fan Tao +10 more
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ABSTRACT The transient electromagnetic method (TEM) for boreholes uses fixed source loops to launch at excavation faces, and is able to realize the mobile reception of secondary fields in the boreholes and detections of low-resistance hazards.
Fan Tao +10 more
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An overview of a highly versatile forward and stable inverse algorithm for airborne, ground-based and borehole electromagnetic and electric data [PDF]
Exploration Geophysics, 2015 International audienceWe present an overview of a mature, robust and general algorithm providing a single framework for the inversion of most electromagnetic and electrical data types and instrument geometries.
Esben Auken +2 more
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Geophysics, 1988
Abstract Borehole geophysical methods can be useful in detecting subsurface fracture zones and mineral deposits which are nearby, but not intersected by boreholes. One electrical borehole technique which can be applied to this problem is the surface-to-borehole transient electromagnetic (TEM) method. In this method a transmitting loop
Richard C. West, Stanley H. Ward
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Abstract Borehole geophysical methods can be useful in detecting subsurface fracture zones and mineral deposits which are nearby, but not intersected by boreholes. One electrical borehole technique which can be applied to this problem is the surface-to-borehole transient electromagnetic (TEM) method. In this method a transmitting loop
Richard C. West, Stanley H. Ward
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International Workshop on Gravity, Electrical & Magnetic Methods and Their Applications, Beijing, China, October 10–13, 2011, 2011
GEM Beijing 2011: International Workshop on Gravity, Electrical & Magnetic Methods and Their Applications Beijing, China. October 10-13, 2011. Transient electromagnetic fields: their efficient three-dimensional simulation and application to borehole-based observation techniques Martin Afanasjew, Jana Borner, Ralph-Uwe Borner, Michael Eiermann, Oliver ...
Martin Afanasjew +5 more
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GEM Beijing 2011: International Workshop on Gravity, Electrical & Magnetic Methods and Their Applications Beijing, China. October 10-13, 2011. Transient electromagnetic fields: their efficient three-dimensional simulation and application to borehole-based observation techniques Martin Afanasjew, Jana Borner, Ralph-Uwe Borner, Michael Eiermann, Oliver ...
Martin Afanasjew +5 more
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Arabian Journal of Geosciences, 2021
Discrete direct current (DC) resistivity sounding still remains a convenient and popular tool for groundwater studies in wadi environments in Egypt, such as Wadi Feiran. It is considered one of the main sources for groundwater in Southern Sinai, Egypt.
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Discrete direct current (DC) resistivity sounding still remains a convenient and popular tool for groundwater studies in wadi environments in Egypt, such as Wadi Feiran. It is considered one of the main sources for groundwater in Southern Sinai, Egypt.
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Weak-Signal Reconstruction under Strong Noise in Borehole Transient Electromagnetics
The borehole transient electromagnetic (BTEM) method is a key technology for metallic mineral, groundwater, and related resource exploration, with measured responses exhibiting exponential decay over multiple orders of magnitude in dynamic range. However, late-time signals attenuate to extremely low amplitudes and become submerged in noise, creating a ...Yi Ye, Chao Zhang, Nian Yu
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