Comparison on Rare Gas Geochemical Characteristics and Gas Originations of Kuche and Southwestern Depressions in Tarim Basin, China

Table 1

Molecular composition of hydrocarbon, nonhydrocarbon, and rare gases in some gas fields from the Kuche and Southwestern Depressions, Tarim Basin.

Tectonic unit	Gas field	Strata	CH4 (%)	CO2 (%)	N2 (%)	C1-4 (%)	C1/C1+	He (10^-6)	Ne (10^-6)	Ar (10^-6)	Kr (10^-6)	Xe (10^-8)	References
Kuche Depression	Kela2	E	98.4	0.05	0.69	99.26	0.991	55	1.79	35	0.011	0.224	[15]
		K1, E	97.5	0.60	0.37	99.03	0.985	41	3.34	19	0.005	0.167
		K1, E	93.7	0.53	0.36	99.11	0.995	52	1.82	26	0.009	0.172
		K1, E	98.1	0.70	0.56	98.74	0.994	53	1.77	20	0.007	0.166
		K1, E	97.4	0.69	0.38	98.93	0.985	59	1.46	19	0.006	0.162
		K1, E	98.3	0.69	0.58	98.73	0.994	53	1.73	27	0.009	0.180
		K1, E	97.7	0.43	0.36	99.2	0.985	48					This paper
		K1, E	97.5	0.64	0.38	98.97	0.984	52
	Dabei	K1bs	95.8	1.42	0.44	98.15	0.976	59	1.73	18	0.008	0.204	[23]
		K1bs	97.1	0.81	0.58	98.61	0.984	57	1.52	37	0.010	0.176
		K1bs	94.8	1.27	1.67	97.03	0.977	57	1.55	15	0.007	0.151
		K1bs	95.3	1.29	0.71	98.05	0.97	57	2.04	55	0.013	0.226
		K1bs	94.3	1.27	0.99	97.71	0.965	60	1.74	24	0.007	0.143
	Dina	E	87.3	0.59	1.58	97.83	0.892	38	1.18	25	0.008	0.144	This paper
		E	88.5	0.33	1.11	97.95	0.904	40
		E	89.1	0.36	1.08	98.34	0.906	33
	Keshen	K1bs	97.9	0.61	0.86	98.53	0.994	36	2.05	30	0.008	0.151
		K1bs	98.3	0.30	0.72	98.98	0.993	45	1.40	30	0.007	0.178
		K1bs	97.9	0.78	0.70	98.45	0.994	32	1.30	23	0.008	0.165
Southwestern Depression	Akemomu	K	81.1	10.20	8.40	81.40	0.996	1046	10.26	342	0.042	1.081
		K	80.8	11.30	7.80	80.89	0.997	1062	10.96	394	0.056	1.402
Air								5.24	18.18	9340	1.140	8.7