Geoelektriske Undersøgelser i Danmark og Skåne 1953

Abstract

The earth resistivity surveys which have been carried out in Denmark and Scania (Southern Sweden) during 1953 in accordance with the Wenner-method include both research and exploration projects.

The particular problem involved in resistivity surveys in Denmark is related to the heterogenous bedding of the Glacial Drift which covers practically the whole country. Level and geologically uniform measuring grounds were therefore selected for particular research projects during the initial stage of the survey in 1953 in order to obtain relatively simple combinations of physical factors in the subsurface.

The final goal of the work was to elaborate a suitable method for mapping of sand and gravel aquifers in the Glacial Drift, bed-rock topography, saltwater occurrences, etc. It was soon realized that a combined method using both trenching measurements and vertical electrical drilling would be the most applicable. Such procedure was applied to fundamental geo-hydrologic problems in different parts of the country after careful geologic planning in each case. The well logs on file in the Well Record Department of the Geological Survey were the very important basis for this work.

The geo-electric work carried out during 1953 has shown that resistivity surveys may yield both scientific and practical results of general value even in a geologically complex region as the Glacial Drift area of Denmark. This is illustrated by 13 case histories of which no. 1, 2, 3, 9, and 10 cover research projects while the rest deals with the location or investigation of aquifers for rural and municipal waterworks.