Table 1. Permeability Prediction Model Based on NMR.

model name	expression	model parameters
Coates model		φ is the core porosity; FFI is the bound fluid saturation, %; and BVI is the movable fluid saturation, %
Coates extension model		φ is the core porosity; C1, m, and n are model parameters; FFI is the bound fluid saturation, %; and BVI is the movable fluid saturation, %
SDR model	K = C2φ4T2g2	C2 is the model parameter; φ is the core porosity; T2g is the geometric mean of relaxation time, ms
SDR expansion model	K = C3φm2T2gn	C3, m, and n are model parameters; φ is the core porosity; and T2g is the geometric mean of relaxation time, ms
single-parameter model27	K = C4e(C5T2g)	C4 and C5 are the model parameters; T2g is the geometric mean of relaxation time, ms