Complex Resistivity Dispersion Characteristics of Water-Bearing Coal Based on Double Cole-Cole Model

Table 2

Double Cole-Cole model parameters of two kinds of coal resistivity.

Coal grade	Sw (%)	ρ (kΩ·m)	m1	m2	c1	c2	τ1	τ2	R^2
Bituminous coal	58	44.5	0.40	1	0.56	0.72	0.09	5.6 × 10^−5	0.93
	76.5	18.9	0.45	1	0.49	0.70	0.50	3.3 × 10^−5	0.94
	94.1	15.4	0.47	1	0.40	0.51	0.30	2.6 × 10^−6	0.99
	95.2	17.3	0.50	1	0.44	0.52	0.07	2.2 × 10^−6	0.99
	97.1	14.8	0.53	1	0.43	0.53	0.10	3.4 × 10^−6	0.98
	98.3	15.6	0.56	1	0.34	0.53	0.29	1.3 × 10^−6	0.98
	100	14.9	0.63	1	0.26	0.60	1.05	1 × 10^−6	0.96
Anthracite	42.1	1.05	0.10	1	0.10	0.70	0.03	8 × 10^−4	0.73
	47.4	0.99	0.23	1	0.94	0.70	0.07	3 × 10^−4	0.90
	57.9	0.65	0.28	1	0.80	0.42	0.13	1.6 × 10^−4	0.83
	78.9	0.57	0.37	1	0.64	0.45	0.19	5 × 10^−5	0.73
	94.7	0.43	0.49	1	0.57	0.43	0.17	2 × 10^−5	0.96
	97.4	0.35	0.43	1	0.46	0.37	0.23	1 × 10^−5	0.98
	100	0.30	0.39	1	0.62	0.40	0.15	9.1 × 10^−6	0.94