The invention relates to the technical field of oilfield development, and discloses a multi-level sublithology intelligent interpretation model construction method and application thereof, and the method comprises the steps: carrying out the preprocessing of an original
logging curve; performing multi-level sub-
wavelet decomposition according to the preprocessed original
logging curve to obtain a plurality of
wavelet components with different frequencies; according to the multiple
wavelet components with different frequencies,
logging curve reconstruction is carried out, and a first reconstructed logging curve and a second reconstructed logging curve are obtained; according to
lithology data of a target rock area, an original logging curve, a first reconstruction logging curve and a second reconstruction logging curve, through an
integration algorithm and a training model, learning mapping relations between the original logging curve and a composite sand body, between the first reconstruction logging curve and a single sand body and an argillaceous interlayer, and between the second reconstruction logging curve and a thin reservoir and a physical interlayer; and a multi-level
lithology intelligent explanation model is obtained. According to the method,
well logging fine interpretation of
lithology of different thicknesses can be realized, particularly accurate identification of lithology of
centimeter-level thickness can be realized, and the
well logging interpretation precision is improved.