Transmitter-receiver induction techniques and probes developed for surface and borehole measurements: Application to archaeology and mineral exploration.

Clerc, Georges Le; Frignet, B.; Tabbagh, Alain

doi:10.5636/jgg.35.443

Cited by 8 publications

(4 citation statements)

References 4 publications

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“…Later, the progress achieved in shallow-depth surface prospecting for the simultaneous measurement of both electrical conductivity and MS of soils showed the advantages of two-coil instruments (Parchas and Tabbagh, 1978). Analogous instruments were then designed for logging in mining applications (Clerc et al, 1983) and others for studying the oceanic crust (Daly and Tabbagh, 1988) and sedimentary layers (Pozzi et al, 1988) in combination with magnetic field logging. This concept of combined tools opened very interesting lines of research for studying the magnetic field inversion scale.…”

Section: Magnetic Susceptibility Loggingmentioning

confidence: 99%

Improvement of cyclostratigraphic studies by processing of high-resolution magnetic susceptibility logging: Example of PEP1002 borehole (Bure, Meuse, France)

Huret

Thiesson

Tabbagh

et al. 2011

Comptes Rendus. Géoscience

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Section: Magnetic Susceptibility Loggingmentioning

confidence: 99%

Improvement of cyclostratigraphic studies by processing of high-resolution magnetic susceptibility logging: Example of PEP1002 borehole (Bure, Meuse, France)

Huret

Thiesson

Tabbagh

et al. 2011

Comptes Rendus. Géoscience

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“…This sensitivity to geologic noise, together with the geometric noise (relative motion of transmitter and receiver caused by flexing of the probe, estimated to be about 1 percent), constitute the main limitations to the method because they exceed the specified instrumental sensitivity of 0.1 percent. More recently short-and long-spacing induction logging devices, ROMULUS and ERIC, respectively, have been developed in France (Clerc et al, 1983;Frignet, 1986). For the coil separation of 30 rn (Table 1), which is the maximum that can be handled conveniently, the search radius is limited to about 15 rn under good conditions.…”

Section: Figure 5 Shows Characteristic Responses (Obtained From Scalementioning

confidence: 99%

11. Drill-Hole Electromagnetic Methods

Dyck¹

1991

Electromagnetic Methods in Applied Geophysics

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882 Dyck (LLEM) are discussed separately in a subsequent section. The series of field examples presented include the Trillabelle and Gertrude deposits in the Sudbury, Canada region, which have served as test sites for many different methods, and several examples which have recently appeared in the literature. These examples illustrate the range of approaches that are taken to interpretation. HISTORICAL DEVELOPMENTThe course of development of EM methods applied in drill holes has been treated in some detail in Dyck (1975b) and only highlights are given here. EM methods were first applied in the well-logging industry (induction loggers). Doll (1949) described the basis for interpretation of induction logs as the "geometrical factor" concept in which noninteracting (i.e. resistive limit) eddy currents are induced in the medium. The eddy currents are considered to be concentric with the drill hole for the simplest configuration in which both transmitter and receiver are close together (of the order of 1 m) and lie coaxial with the hole (configura-EM TRANSMITTER :.i.i:i:!:OVERBURDE.. N AND/OR WEATHERED SHALLOW TARGET RECEIVER tion a, Figure 2). The use of this rather large-diameter device has not spread to mining exploration. An exception is a recent development in France of a similar short-spacing device designed specifically for slim-hole detection of highly conducting metallic sulfides (Frignet, 1986).One of the first large-scale prospecting systems designed to detect conducting sulfide bodies at some distance from the hole was introduced in Noakes (1951). The prototype system was similar to the surface Turam method (Parasnis, 1991, this volume) in that the transmitter was a large, fixed loop and the receiver a dual-coil device that measured the difference in magnetic field at two points about 15 rn apart. This equipment, by demonstrating that the method worked, became the forerunner of modern frequencydomain (FEM) drill-hole systems using large-loop transmitters. A similar concept was described in Vekseer and Plyusnin (1957). Concurrently, Ward and Harvey (1954) developed a tilt-angle method of downhole EM surveying in which the configuration was minimum coupled (of the type depicted in Figure 2b). While this method is not presently in use, it has characteristics which suggest that it should be revived. A third type of large-scale system employs the fixedseparation, coaxial-coil configuration akin to the induction logger (Figure 2a). Elliot (1961, 1966) de-(a) (b) XRx •Tx MINOR SULFIDE STRINGERS (MODERATE-HIGH) DEEP TARGET CONDUCTIVITY • HIGH (1-10 3 S/m) ?. '"i• MODERATE (10-3-1 S/m) • LOW (10 -5 -10-3S/m) SENSOR MINERALIZED HORIZON Downloaded 08/21/15 to 155.69.4.4. Redistribution subject to SEG license or copyright; see Terms of Use at http://library.seg.org/ Drill-hole EM 883 scribed such a system which operated at 1230 Hz and measured in-phase and quadrature components of secondary field with a sensitivity of 100 ppm. Versions which could operate at coil separations of up to 150 rn (Smith and Hallof, 1971) we...

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“…This was first demonstrated in shallow depth prospecting with a surface double dipole apparatus (Parchas & Tabbagh 1978). An apparatus for mining logging was then built and has shown its ability to measure both properties (Clerc et al 1983).…”

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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Transmitter-receiver induction techniques and probes developed for surface and borehole measurements: Application to archaeology and mineral exploration.

Cited by 8 publications

References 4 publications

Improvement of cyclostratigraphic studies by processing of high-resolution magnetic susceptibility logging: Example of PEP1002 borehole (Bure, Meuse, France)

Improvement of cyclostratigraphic studies by processing of high-resolution magnetic susceptibility logging: Example of PEP1002 borehole (Bure, Meuse, France)

11. Drill-Hole Electromagnetic Methods

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

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