Direct measurement of Proton Magnetic Resonance (PMR) signal from water molecules guarantees a high reliability of the water detection. It is the main distinction of the PMR compared to other geophysical tools. Interpretation of experimental data reveals location of aquifers, theirs depth and water content. A mean size of pores of the water-saturated rocks can also be estimated.Currently the method is mostly developed for investigation of sedimentary aquifers. Meanwhile the physical principles of the method allow to use it also for detection of water in fractured rocks and for discrimination among aquifers composed by different types of rock. This field study was performed in order to calibrate the PMR signal generated by water in fractured chalk aquifers.It was found that the decay time of the PMR signal is the most suitable parameter which can be used for characterization of aquifers. However, the water content is also an important parameter for localization of aquifers and for comparison of bulk volume of water in aquifers composed by siinilar rocks.
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