Resistivity Profiling With Different Electrode Arrays Over a Graphite Deposit*

Abstract

BRASS, G., FLATHE, H. and SCHULZ, R. 1981, Resistivity Profiling with Different Electrode Arrays over a Graphic Deposit, Geophysical Prospecting 29, 589-600.Motivated by several papers by Indian colleagues suggesting that a single-pole array is the most favorable one for locating electrically conductive targets in the underground, detailed measurements were carried out with different electrode arrays over a well-known graphite deposit near Pfaffenreuth, Germany. The following arrays were used: (1) Wenner array; (2) single-pole array; (3) half-Wenner array; (4) half-Schlumberger array. Each of the arrays established the location of the main graphite deposit. The half-Schlumberger array turned out to.be the most reliable one since it showed details which were only very poorly indicated by the other arrays or not at all.Mathematical modeling of three-dimensional bodies simulating the geological situation for this deposit were carried out. These results show an unexpectedly good correlation with the measured effects.

Combined Sounding‐profiling Resistivity Measurements With the Three‐electrode Arrays*

“…Blokh 1962, Gruntorad andKarous 1972, Brass, Flathe andSchultz 1981). Its advantage is the ability to locate conductive and resistive dykes as well as to map lithological units with different resistivities.…”

“…Several authors have shown that the combination of two asymmetrical threeelectrode arrays A M N , M N B is one of the most effective resistivity profiling techniques (e.g. Blokh 1962, Gruntorad andKarous 1972, Brass, Flathe andSchultz ). Its advantage is the ability to locate conductive and resistive dykes as well as to map lithological units with different resistivities.…”

Application de méthodes de prospection à l’étude géo-archéologique de la plaine côtière du fleuve Potenza (Les Marches, Italie)

“…6 et 7, forage 1 La technique pôle-pôle adaptée a quelques avantages vis-à-vis des méthodes classiques comme le dispositif Wenner : on peut utiliser un résistivimètre compact et léger, ici un Norma Erdungsmesser D3950 qui mesure directement la valeur V MN /I, et des tiges métalliques comme électrodes, car un courant alternatif suffit pour des sondages peu profonds. En outre le dispositif pôle-pôle nécessite des distances trois fois plus petites que le dispositif Wenner pour contrôler une profondeur analogue (Brass et al, 1981) et il ne faut déplacer que deux ou bien une seule électrode par mesure. Sur des champs larges et libres d'obstacles la procédure nous a permis de mesurer un transect de 150 m de longueur avec une distance entre les électrodes de 2 m en une demi-journée, avec trois personnes.…”

A Case Study of Dipole-Dipole Resistivity for Geotechnical Engineering from the Ras en Naqab Area, South Jordan

“…Although some faults can be detected by surficial geological mapping, others have no visible ex pression and can only be located by subsurface investiga tions. Studies by Keller et al (1975), Brass et al (1981), Majumdar and Datta (1981), Vandenberghe (1982), Flovenz (1984) and Batayneh et al (1999) have been tried through out the world for geothermal prospecting, mining geophys ics and engineering purposes to map vertical and/or subvertical anomaly fractures.…”