Abstract
The water hazard is one of the major accidents in coal mines. The existing geophysical exploration methods do not meet the precise requirements for exploration accuracy. Nuclear magnetic resonance (NMR) is currently the only geophysical method that can directly detect groundwater. This paper firstly introduces the basic principles and working methods of surface-to-underground NMR, and then gave the NMR response of the uniform earth excited by a circular loop source, at last, the NMR responses of some aquifers at different depths were simulated by the numerical modeling. The response for the observation underground is higher than that on the surface, which shows that the surface-to-underground NMR can increase the detection depth.
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