Evidence of Multiple Sources of Soil Gas in the Tangshan Fault Zone, North China

Table 2

Geochemical compositions of gases sampled in shallow depth wells.

No.	Site	CO2 (%)						Rn (kBq m^-3)						He (ppm)	N2 (%)	O2 (%)	H2S (ppm)	Ar (%)	CO2 (%)	CH4 (ppm)	δ^13 C (‰)	^3He/^4He (R/Ra)	^4He/^20Ne	CO2/^3He
		6.2018	7.2018	8.2018	9.2018	10.2018	11.2018	6.2018	7.2018	8.2018	9.2018	10.2018	11.2018	9.2018
1	DHT	1.91	3.60	5.17	4.54	1.72	2.01	18.40	16.10	19.80	16.16	19.00	25.80	5.04	79.32	18.18	0	0.92	1.57	43	-19.8	0.56	0.31	1.94E+09
2	TJYC	3.76	4.40	3.83	3.30	2.08	2.11	9.69	9.14	8.20	6.17	6.06	6.80	5.98	78.73	19.90	0	0.92	0.46	31	-19.9	0.54	0.30	5.95E+08
3	HBLG	3.59	4.01	4.32	6.23	2.55	3.50	23.20	22.30	22.40	13.80	33.00	27.20	8.11	79.66	17.14	0	0.94	2.25	38	-18.9	0.55	0.31	2.96E+09
4	LHD	0.62	0.59	0.74	0.85	0.89	0.89	6.72	6.47	6.7	5.88	4.59	7.15	7.33	93.65	4.55	56	1.09	0.70	87	-19.8	0.56	0.29	3.68E+08
5	HET	0.14	0.12	0.09	0.13	0.15	0.18	8.53	9.31	5.34	5.93	4.37	7.86	7.12	97.81	0.45	631	1.15	0.32	113	-19.7	0.55	0.28	8.13E+08
6	SWZ	2.04	1.62	2.50	2.82	3.66	3.48	8.71	8.08	9.33	10.20	11.80	12.90	6.17	80.96	15.61	0	0.94	2.49	38	-19.7	0.49	0.30	3.18E+09
7	WFS	1.15	2.45	2.78	3.28	3.26	2.99	31.00	26.10	26.10	25.70	31.80	31.60	6.22	78.64	18.48	0	0.92	1.96	32	-19.4	0.52	0.31	2.48E+09