Correction method of nuclear magnetic resonance logging wave spectrum

The invention provides a correction method of nuclear magnetic resonance logging wave spectrum. The correction method comprises the following steps: a step S1, separating the nuclear magnetic resonance wave spectrum in a neutral reservoir into a water-containing spectrum and an oil-containing spectrum by using a nuclear magnetic resonance wave spectrum separating model; a step S2, calculating a water surface relaxation rate and an oil surface relaxation rate of an aperture in the neutral reservoir by using a surface relaxation rate calculating model; a step S3, calculating the pore throat radius distribution of an oil-containing part in the neutral reservoir by using the oil surface relaxation rate; a step S4, correcting the pore throat radius distribution of the oil-containing part according to the water surface relaxation rate, in order to obtain the corrected water saturated nuclear magnetic resonance wave spectrum of the oil-containing part in the neutral reservoir; a step S5, carrying out superposition for the oil-containing spectrum and the corrected water saturated nuclear magnetic resonance wave spectrum of the oil-containing part, in order to obtain the corrected water saturated nuclear magnetic resonance wave spectrum of the neutral reservoir; the accurate water saturated nuclear magnetic resonance wave spectrum of the neutral reservoir is obtained by using the correction method, and accurate analysis is carried out for the neutral reservoir.