Table 1: Analysis results of natural gas from western Sichuan gas field.

Field No.	C1/(%)	C2/(%)	C3/(%)	i-C4/(%)	n-C4/(%)	i-C5/(%)	n-C5/(%)	C5+/(%)	CO2/(%)	N2/(%)	He/(%)
1	93.1	3.34	0.71	0.15	0.157	0.199	0.73	0.06	0.34	1.25	0.04
2	92.7	4.14	0.78	0.16	0.166	0.116	0.35	0.05	0.39	1.12	0.01
3	94	2.45	0.47	0.096	0.101	0.042	0.03	0.02	0.52	2.1	0.02
4	93.5	3.23	0.77	0.178	0.184	0.189	0.61	0.1	0.31	1.36	0.01
5	90.51	4.15	1.05	0.237	0.264	0.11	0.07	0.06	0.59	2.85	0.06