Reply to “Corrections to ‘Approximated Solutions for ELF Near-Field Propagation Due to a Horizontal Electric Dipole Excitation Near the Sea-Rock Boundary”’

2019 ◽  
Vol 67 (6) ◽  
pp. 4320-4320
Author(s):  
Hong Lei Xu ◽  
Ting Ting Gu
Keyword(s):  
Electric Dipole ◽  
Near Field ◽  
Dipole Excitation ◽  
Horizontal Electric Dipole

Transient marine electromagnetics in shallow water: A sensitivity and resolution study of the vertical electric field at short ranges

Geophysics ◽  
2014 ◽  
Vol 79 (1) ◽  
pp. E39-E49 ◽  
Author(s):  
Pavel O. Barsukov ◽  
Edward B. Fainberg
Keyword(s):  
Shallow Water ◽  
Electric Dipole ◽  
Near Field ◽  
Marine Electromagnetics ◽  
Transverse Resistance ◽  
Vertical Electric Dipole ◽  
Vertical Electric Field ◽  
Horizontal Electric Dipole ◽  
The Time Domain ◽  
Dipole Sources

We analyzed the sensitivity of transient step-off responses of shallow-water marine controlled-source electromagnetic configurations, specifically, horizontal electric dipole sources and vertical electric dipole receivers in the near field of the time domain ([Formula: see text]). The capabilities of this configuration were compared with commonly used configurations, specifically, horizontal electric dipole sources and horizontal electric dipole receivers in the frequency domain ([Formula: see text]). By examining some simplified models of local hydrocarbon reservoirs representing separate resistive bodies of limited size buried at different depths in the conductive sediments, and an example of a complex 3D geologic structure, the applications of [Formula: see text] and [Formula: see text] configurations and their limitations in terms of depth, size, and transverse resistance were evaluated.

On modeling a well casing for resistivity and induced polarization

Geophysics ◽  
1984 ◽  
Vol 49 (11) ◽  
pp. 2061-2063 ◽  
Author(s):  
James R. Wait
Keyword(s):  
Electrical Properties ◽  
Electric Dipole ◽  
Free Space ◽  
Eddy Currents ◽  
Interfacial Polarization ◽  
Induced Polarization ◽  
Mutual Impedance ◽  
The Earth ◽  
Horizontal Electric Dipole ◽  
Displacement Currents

In a previous communication I proposed an analytical model to simulate the electromagnetic (EM) and induced polarization (IP) response of a metal well casing (Wait, 1983). To facilitate the analysis, the earth was idealized as a homogeneous conducting half‐space of electrical properties (σ, ε, μ). The well casing was represented as a filamental vertical conductor of semiinfinite length that was characterized by a series axial impedance to account for eddy currents and interfacial polarization. A further basic simplification was to neglect displacement currents in the air; this was justified when all significant distances were small compared with the free‐space wavelength. Initially, the source was taken to be a horizontal electric dipole or current element I ds on the air‐earth interface. By integration of the results, the mutual impedance between two grounded circuits could be ascertained. In the absence of the vertical conductor (i.e., the well casing) the results reduced to those given by Sunde (1968) and Ward (1967).

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