Research on Adsorption and Desorption Characteristics of Gas in Coal Rock Based on Nuclear Magnetic Resonance Technology

Table 3

Peak area of methane adsorption and desorption under different pressures.

Methane adsorption				Methane desorption
Pressure (MPa)	Adsorption peak	Free peak	Total peak area	Pressure (MPa)	Adsorption peak	Free peak	Total peak area
10.33	8681.762	12698.17	21379.94	——	——	——	——
7.62	7929.735	9009.905	16939.641	7.27	8031.894	8636.967	16668.861
5.91	5898.243	6546.558	12444.802	5.33	7641.708	6217.434	13859.141
3.39	4923.571	3561.819	8485.389	3.23	7054.432	3723.823	10778.255
1.93	3083.376	1843.329	4926.706	1.58	6816.78	1927.395	8744.174
1.11	2279.002	1084.695	3363.697	0.63	5995.802	977.376	6973.178
0.5	1693.325	522.343	2215.668	——	——	——	——