DEVELOPMENT OF BOREHOLE GEOPHYSICAL SYSTEMS
The application of IP/resistivity and Pulse Electromagnetic (PEM) techniques for mineral exploration in drill-holes has been investigated. A down-hole wide spacing multielectrode IP/resistivity system has been designed and developed for use with commercial surface equipment. To provide a theoretical basis for the interpretation of in-hole IP anomalies, a parametric model study was undertaken. Type curves have been acquired for down-hole pole - dipole, and dipole - dipole electrode configurations for a variety of target array geometries. The model results confirm that wide spacing measurements can significantly increase the prospective search radius of drill-holes and provide diagnostic information on target off-set, dip and in intersection cases, the spatial distribution of mineralization away from the hole. Empirical field studies with a down-hole PEM system have provided insight on the operational characteristics, detectability and interpretational advantages of this particular technique.
Bibliographic Reference: EUR 8255 EN (1984) MF, 85 P., BFR 120, EUROFFICE, LUXEMBOURG POB 1003
Availability: Can be ordered online
Record Number: 1989122033400 / Last updated on: 1987-01-01
Available languages: en