Abstract:

     The features of Surface Nuclear Magnetic Resonance (SNMR) signal for underground water and the sources and characters of the spike noise distortion are analyzed. A method to eliminate the spike noise interference is proposed and program simulation is conducted. Three improved noise elimination methods based on stacking method are compared by simulation. It is shown that the Dvalue thresholdvalue substitution stacking method outperforms the other methods in terms of spike noise suppression and SNMR parameters extraction. Largescale field measurements demonstrate the feasibility and practicability of the proposed spike noise elimination method. High Signal to Noise Ratio (SNR) and low noise signal are achieved and accurate parameters are obtained for the SNMR conversion.

Key words: SNMR, noise, interference, pike noise, tacking, hresholdvalue, FID