SIROTEM: A New Portable Instrument for Multichannel Transient Electromagnetic Measurements

Buselli, G.; O’Neill, Brendan W.

doi:10.1071/eg977082

Cited by 60 publications

(21 citation statements)

References 2 publications

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“…It may be thought that, as a reasonable approximation, we could use a step-function turnoff and ignore the effect of the first two channels on an instrument such as SIROTEM (Buselli and O'Neill, 1977). This is not the case.…”

Section: Inversion Methodsmentioning

confidence: 95%

The joint use of coincident loop transient electromagnetic and Schlumberger sounding to resolve layered structures

Raiche

Jupp

Rutter³

et al. 1985

GEOPHYSICS

175

108

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One-dimensional earth models consisting of uniform horizontal layers are useful both as actual representations of earth structures and as host models for more complex structures. However, there are often inherent difficulties in establishing layer thicknesses and resistivities from one type of measurement alone. For example, the de resistivity method is sensitive to both conductive and resistive layers, but as these layers become thin, non uniqueness becomes a severe problem. Electromagnetic (EM) methods are good for establishing the parameters of conductive layers, but they are quite insensitive to resistive layers.The use of both coincident loop transient EM (TEM) and Schlumberger methods, together with a joint inverse computer program, can vastly improve interpretation of layered-earth parameters. The final model is less dependent upon starting guesses, error bounds are much improved, and non uniqueness is much less of a problem. These advantages are illustrated by interpretation of real field data as well as by a theoretical study of four different types of earth models.

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Section: Inversion Methodsmentioning

confidence: 95%

The joint use of coincident loop transient electromagnetic and Schlumberger sounding to resolve layered structures

Raiche

Jupp

Rutter³

et al. 1985

GEOPHYSICS

175

108

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“…More details of the geology and the conductivity structure can be found in Adams and Schmidt (1980)and Emerson (1980b),respectively, and these have been summarized in the overlay to Figure 12. Figure 10 depicts the SIROTEM (Buselli and O'Neill, 1977) profile measured across the center of the orebody (line 50800N) using a lOQ-m square transmitter loop and an in-loop receiver with an effective area of 4900 m 2 (the in-loop response can be approximated by the coincident-loop response at late delay times). Each curve represents the voltage response at the delay time shown on the right-hand side of the plot.…”

Section: M)mentioning

confidence: 99%

An automatic technique for presentation of coincident‐loop, impulse‐response, transient, electromagnetic data

1994

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Coincident-loop TEM sounding data are often presented by plotting the half-space apparent conductivity as a function of delay time. A new algorithm generates an improved presentation that plots the apparent conductivity as a function of depth. The resulting data may be further processed to sharpen or "spike" the smoothly varying apparent-conductivity/ depth curves in an attempt to better represent the rapid changes in conductivity that often exist in the earth. The algorithm described involves an approximation, but is simple, easy to use, and computationally efficient.

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“…5). The transient electromagnetic (TEM) data were simultaneously collected with the VES data using the SIROTEM MK3 conductivity meter (BUSELLI, and O'NEILL, 1977) during which the common coincident squared loop configuration (loop side length = 50 m) was employed. The data were recorded using the composite mode, where the measurement times ranged from 0.1 to 17.4 ms after the primary transmitter current is turned-off through 25 time gates.…”

Section: Ves-tem Data Acquisitionmentioning

confidence: 99%

Delineation of Shallow Subsurface Structure by Azimuthal Resistivity Sounding and Joint Inversion of VES-TEM Data: Case Study near Lake Qaroun, El Fayoum, Egypt

Massoud

El-Qady

Metwaly

et al. 2009

Pure appl. geophys.

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An azimuthal resistivity survey was conducted at the transition zone between the desert area and the cultivated land near Lake Qaroun, Egypt. This area has been affected by an east-west trending fault system as indicated from the surface geology. Apparent resistivity values were plotted along azimuth on a polar diagram. Resistivity anomalies, for most of the AB/2 values with long axes strike in a direction parallel to the contact between the desert and cultivated lands, indicate the presence of electrical macro-anisotropy, mainly due to the faulting effect, at this area. Vertical electrical soundings (VES) and transient electromagnetic (TEM) measurements were conducted at eight stations along a line that crosses the boundary between the desert and cultivated land. Joint inversion of VES-TEM data was successfully used for identification of the subsurface lithostratigraphic succession and demonstrated the effect of the fault zone on the investigated subsurface medium. Apparent anisotropy coefficients at all current electrode spacings were calculated, plotted against AB/2 values and compared with the geoelectrical cross section. The effect of the fault zone was detected at AB/2 spacings equal to 100 m and extended downward and is largely related to the depth of the fault, as indicated in the constructed cross section.

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SIROTEM: A New Portable Instrument for Multichannel Transient Electromagnetic Measurements

Cited by 60 publications

References 2 publications

The joint use of coincident loop transient electromagnetic and Schlumberger sounding to resolve layered structures

The joint use of coincident loop transient electromagnetic and Schlumberger sounding to resolve layered structures

An automatic technique for presentation of coincident‐loop, impulse‐response, transient, electromagnetic data

Delineation of Shallow Subsurface Structure by Azimuthal Resistivity Sounding and Joint Inversion of VES-TEM Data: Case Study near Lake Qaroun, El Fayoum, Egypt

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