Propagation Effects in Induction Logging

Duesterhoeft, W. C.

doi:10.1190/1.1438859

Cited by 24 publications

(4 citation statements)

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“…Geophysics provides a means of increasing the sampling radius of a hole, though indirectly. One well-developed method is induction logging, described by Doll (1946), Duesterhoeft (1961), and Kaufman (1966). The in-hole tool consists of two coils, one that generates an electromagnetic field and the other that detects the secondary magnetic field from eddy currents in the rock.…”

Section: Drill-hole-assisted Methodsmentioning

confidence: 99%

Exploration for mineral resources

1969

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Section: Drill-hole-assisted Methodsmentioning

confidence: 99%

Exploration for mineral resources

1969

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“…where σ a is defined as apparent conductivity and is a function of the geometry factor. Detailed discussion on the geometry factor is given in references (Duesterhoeft, 1961;Duesterhoeft and Smith, 1962). The direct-coupled signal V x does not contain any useful information but presents a large background noise in the received signal.…”

Section: Induction Sensing Principlementioning

confidence: 99%

A Multi–Frequency Electromagnetic Image System

Zhang

Chen

Jiang

et al. 2003

Computer aided Civil Eng

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A digital, multi-frequency electromagnetic image system is developed based on the induction principle for subsurface imaging near a sewage pipe. This system, which features a broadband operation, can transmit sinusoidal in a frequency range of 1.25 KHz to 10 KHz. A microprocessor is used for all controls and computations for both the transmitter and receiver circuits. Synchronous sampling is used for digitization in order to compute the phase as well as the amplitude of the receiving signal. The system operates in the frequency domain and both the phase and amplitude information can be computed through a digital signal-processing algorithm. Test results indicate that the multi-frequency EM sensor is superior in both the missing manhole detection and general subsurface conductivity imaging to the conventional singlefrequency sensors. For loop antennas with a spacing of 0.5 m, the system has a phase resolution of about 1 • and an amplitude resolution of about 0.5%.

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“…Detailed discussion on the geometry factor is given in references [18] and [19]. Detailed discussion on the geometry factor is given in references [18] and [19].…”

Section: Transmittingmentioning

confidence: 99%

<title>Multifrequency EM image system</title>

et al. 2000

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A digital, multi-frequency EM image system is developed based on the induction principle for subsurface imaging near a sewage pipe. This system, which features a broadband operation, can transmit sinusoidal in a frequency range of 1.25KHz to 10KHz. A micro controller is used for all controls and computations for both the transmitter and receiver circuits.Synchronous sampling is used for digitization in order to compute the phase as well as the amplitude of the receiving signal. The system operates in the frequency domain and both the phase and amplitude information can be computed through a DSP algorithm. Test results indicate that the multi-frequency EM sensor is superior in both the missing manhole detection and general subsurface conductivity imaging to the conventional single-frequency sensors. For loop antennas with a spacing of O.5m, the system has phase resolution about 1 and amplitude resolution about 0.5 percent.

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Propagation Effects in Induction Logging

Cited by 24 publications

References 0 publications

Exploration for mineral resources

Exploration for mineral resources

A Multi–Frequency Electromagnetic Image System

<title>Multifrequency EM image system</title>

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