Propagation Effects on Radial Response in Induction Logging

Duesterhoeft, W. C.; Smith, H. W.

doi:10.1190/1.1439046

Cited by 14 publications

(5 citation statements)

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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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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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“…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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“…The principle of the calculation (Moran & Kunz 1962;Duesterhoeft & Smith 1962;Anderson 1968;Parchas 1979;Wait 1984) consists in solving the wave equation for an electrical potential vector. We consider here three media limited by cylindrical surfaces.…”

Section: The Electromagnetic P R O B Ementioning

confidence: 99%

Towards the in situ measurement of the remanent magnetization of oceanic basalts

Daly

Tabbagh²

1988

Geophysical Journal International

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Recent developments in electromagnetic double dipole devices make these systems convenient for both magnetic susceptibility and resistivity measurements. The coupling of such an electromagnetic logging tool with a magnetic probe supplying the three components of the total magnetic field in the well, allows in siru determination of magnetic parameters. This paper shows how to (i) interpret the raw data in terms of magnetic susceptibility and resistivity of the surrounding medium (ii) determine the horizontal and vertical components of the total magnetization, and (iii) separate the remanent magnetization which seems to be possible at many points of the logging.

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Propagation Effects on Radial Response in Induction Logging

Cited by 14 publications

References 0 publications

A Multi–Frequency Electromagnetic Image System

A Multi–Frequency Electromagnetic Image System

<title>Multifrequency EM image system</title>

Towards the in situ measurement of the remanent magnetization of oceanic basalts

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