INFLUENCE INVESTIGATION OF EARTH ELECTRICAL CONDUCTIVITY ON SURFACE NMR SIGNALS

The advantage of the surface nuclear magnetic resonance (NMR) method compared to other geophysical methods in the field of groundwater investigation is of the ability to measure NMR signal directly from the water molecules. The initial amplitude of the signal corresponds to the location and amount of free water in the aquifers. In the practical application, the earth electrical conductivity of the field may effect the NMR signal. In order to estimate the effect of the conductivity of the ground, a numerical simulation of the NMR signal is conducted. The result of simulation indicates that formation of the aquifers can be estimated by the amplitude of the NMR signal, and the NMR measurements are, however, also sensitive to earth electrical conductivity which causes the decrease of exploration depth.