Table 2. Fitting Formula and Errors of Permeability Prediction Models Based on NMR.

model name	fitting formula	MAPE/%
Coates model		208.84
Coates extension model		337.68
SDR model	K = C2φ4T2g2	215.94
SDR extension model	K = 0.143φ–0.987T2g11.899	94.64
single-parameter model	K = 3.078e(13.348T2g)	64.30
new parameter model	K = 3 × 10–6 exp (6.3416Tw)	19.43