Table 3. Gas Content Estimation Based on China National Standard Method and Mud Method within 2 h of Desorption Experiments in the Field^a.

sample site	burial depth (m)	V1 (m3/t)	V21 (m3/t)	V22 (m3/t)	V3 (m3/t)	Vt1 (m3/t)	Vt2 (m3/t)	K1 (%)	K2 (%)	n1 (%)	n2 (%)
2-3	1415	1.88	2.69	2.98	2.92	7.49	7.78	61.01	62.47	35.91	38.30
4-3	1363	1.99	2.53	2.78	2.18	6.7	6.95	67.46	68.63	37.76	40.00
6-2	1228	0.64	1.08	1.19	2.45	4.17	4.28	41.25	42.76	25.90	27.80
17-1	914	0.4	0.3	0.34	3.73	4.43	4.47	15.80	16.55	6.77	7.61
20-4	1268	1.08	0.87	1.26	4.9	6.85	7.24	28.47	32.32	12.70	17.40
20-5	1369	1.01	0.8	0.82	2.92	4.73	4.75	38.27	38.53	16.91	17.26
21-4	1320	0.65	0.5	0.66	2.43	3.58	3.74	32.12	35.03	13.97	17.65
22-6	1368	2.32	1.64	1.8	5.93	9.89	10.05	40.04	41.00	16.58	17.91
26-4	1215	0.7	0.6	0.63	3.23	4.53	4.56	28.70	29.17	13.25	13.82
13-2	1171.6	1.81	1.11	1.32	3.41	6.33	6.54	46.13	47.86	17.54	20.18
13-3	1368.8	3.67	2.15	2.36	1.82	7.64	7.85	76.18	76.82	28.14	30.06

^aDefinitions: V₁, desorbed gas content in the canister; V₂₁, lost gas content based on the China national standard method; V₂₂, lost gas content based on the mud method; V₃, residual gas content in the laboratory; V_t1, total gas content based on the China national standard method; V_t2 = total gas content based on the mud method; K₁, desorption rate based on the China national standard method; K₂, desorption rate based on the mud method (%); n₁, ratio of V₂₁ to V_t1; n₂, ratio of V₂₂ to V_t2.