Table 1.

Chemical and isoltopic compositions of bulk gases in YC13-1and DF13-2 gas field.

Well	Formation	Compositions (%)								C1/C1–5	δ13C (VPDB, ‰)				δDC1 (‰)	δN (‰)
		C1	C2	C3	C4	C5	C6	CO2	N2		CH4	C2H6	C3H8	CO2
YC13-1-A1	LS3	90.06	1.48	0.44	0.22	0.04	0.03	5.61	1.70	0.97	− 35.3	− 25.4	− 26.2	− 7.7	− 138.5
YC13-1-A3	LS3	89.45	2.04	0.66	0.29	0.09	0.05	5.81	1.15	0.97	− 36.1	− 26.1	− 25.5	− 7.5	− 142.7	− 1.3
YC13-1-A4	LS3	90.64	1.66	0.48	0.17	0.04	0.03	5.38	1.48	0.97	− 35.4	− 26.5	− 26.3	− 7.8	− 141.2	− 2.2
YC13-1-A8	SY	89.56	3.83	1.40	0.60	0.12	0.02	2.13	2.24	0.94	− 38.7	− 26.7	− 25.2	− 7.2	− 154.8	− 1.6
YC13-1-A9	LS3	89.75	1.51	0.51	0.23	0.07	0.02	3.67	2.18	0.97	− 35.2	− 27.0	− 26.5	− 7.8	− 137.6
YC13-1-A12	LS2	88.28	1.98	0.58	0.23	0.05	0.02	6.26	1.83	0.97	− 36.0	− 26.2	− 25.5	− 8.1	− 132.6
YC13-1-A13	LS2	88.84	3.84	1.50	0.74	0.21	0.07	2.95	1.76	0.93	− 38.9	− 26.7	− 25.3	− 8.1	− 151.0
YC13-1-A14	LS2	86.75	3.90	1.45	0.65	0.12	0.03	5.04	1.96	0.93	− 40.7	− 26.2	− 25.3	− 10.8	− 149.5
DF13-2-A1	HL1	88.74	1.44	0.72	0.37	0.10	0.05	0.13	8.39	0.97	− 35.7	− 26.3	− 26.7	—	− 156.2
DF13-2-A3	HL1	88.37	1.44	0.65	0.31	0.10	0.05	0.22	8.76	0.97	− 35.1	− 26.0	− 26.1	—	− 154.4
DF13-2-A4	HL1	88.22	1.37	0.57	0.26	0.08	0.04	0.36	9.04	0.97	− 33.7	− 25.5	− 25.4	− 6.9	− 150.2
DF13-2-A5	HL1	88.41	1.43	0.69	0.35	0.11	0.03	0.20	8.71	0.97	− 34.6	− 26.1	− 26.4	− 8.2	− 152.7
DF13-2-A6	HL1	88.45	1.42	0.64	0.31	0.09	0.04	0.19	8.79	0.97	− 34.7	− 25.8	− 26.5	—	− 152.6	− 5.6
DF13-2-A7	HL1	88.05	1.51	0.77	0.39	0.11	0.04	0.27	8.80	0.97	− 36.3	− 26.6	− 26.3	—	− 156.8	− 5.4
DF13-2-B3	HL1	88.41	1.53	0.74	0.35	0.11	0.04	0.28	8.40	0.97	− 35.5	− 26.2	− 26.0	− 8.1	− 154.5
DF13-2-B4	HL1	88.36	1.52	0.75	0.37	0.11	0.04	0.30	8.46	0.97	− 35.9	− 26.4	− 26.3	− 9.0	− 155.4
DF13-2-B6	HL1	87.35	1.57	0.81	0.37	0.11	0.04	0.28	9.38	0.97	− 36.8	− 26.6	− 26.4	− 9.2	− 158.3
DF13-2-B9	HL1	87.05	1.46	0.81	0.40	0.12	0.04	0.28	9.77	0.97	− 36.7	− 26.4	− 26.5	− 8.2	− 157.7	− 5.5
DF13-2-B12	HL1	88.56	1.48	0.68	0.31	0.10	0.05	0.35	8.40	0.97	− 35.2	− 26.3	− 26.4	− 8.8	− 154.1
DF13-2-B13	HL1	88.57	1.56	0.76	0.33	0.10	0.04	0.29	8.28	0.97	− 36.3	− 26.4	− 25.7	− 8.0	− 157.1
DF13-2-B14	HL1	87.57	1.32	0.67	0.33	0.10	0.05	0.22	9.66	0.97	− 36.8	− 26.4	− 26.8	− 7.5	− 158.3
DF13-2-B17	HL1	88.79	1.50	0.73	0.35	0.10	0.04	0.15	8.27	0.97	− 35.2	− 26.3	− 26.2	—	− 155.0
DF13-2-B19	HL1	88.54	1.51	0.72	0.35	0.11	0.05	0.10	8.51	0.97	− 35.0	− 25.8	− 26.0	− 9.4	− 156.3

Errors are ± 0.1% for concentrations, and ± 0.1‰ for isotope values.

HL Huangliu Formation(Upper Miocene), SY Sanya Formation(Lower Miocene), LS Lingshui Formation(Upper Oligocene).