Recent developments of physical investigations in boreholes and wells

Abstract

Well logging methods and physical borehole investigations have come into use for geohydrological reconnaissance in The NetherIands in recent years. In open uncased boreholes the following features are logged: spontaneous potential, resistivity, natural gamma radiation and diameter; interpretation methods are given in short. Reference is made to investigation methods in observation and discharging wells. Permanent electrode systems can be used for monitoring ground-water salinity.