A Case Study on Preservation Conditions and Influencing Factors of Shale Gas in the Lower Paleozoic Niutitang Formation, Western Hubei and Hunan, Middle Yangtze Region, China

Table 1

The table of Є₁n shale gas composition in wells CY1 and HY1.

Well	Sample ID	CH4 (%)	C2H6 (%)	C3H8 (%)	CO2 (%)	O2 (%)	N2 (%)
CY1	CY-1	8.70	0.07	0.00	13.24	1.42	76.57
	CY-2	7.74	0.21	0.00	22.29	2.18	67.58
	CY-3	7.29	0.83	0.00	8.95	4.38	78.55
	CY-4	7.75	0.10	0.01	16.30	3.69	72.15
	CY-5	10.58	0.31	0.01	22.26	2.36	64.48
	CY-6	9.83	0.14	0.00	12.40	4.41	73.22
HY1	HY-1	12.30	0.18	0.00	4.58	0.00	82.94
	HY-2	13.30	0.18	0.00	3.20	0.00	83.32
	HY-3	11.23	0.19	0.00	1.74	0.00	86.84