Isotopic Composition of Abiogenic Gas Produced in Closed-System Fischer-Tropsch Synthesis: Implications for the Origins of the Deep Songliao Basin Gases in China

Table 1

The gas yields and isotopic composition of the Fischer-Tropsch synthesis.

Sample	T (°C)	P (MPa)	t (hr)	NaHCO3 (mg)	NaBH4 (mg)	Yields (ml/g NaHCO3)					δ^13C (PDB, ‰)				δ^2H (SMOW, ‰)
						C1	C2	C3	CO2	C4+C5	CO2	C1	C2	C3	C1	C2	C3
NaHCO3+NaBH4+Fe3O4	380	30	6	37.07	3.89	1.38	0.18	0.09	0.05	0.04	-36.19	-19.09	-35.12	-33.81	-267.24	-456.62	-180.43
	380	30	18	32.88	5.78	14.10	0.53	0.18	0.08	0.10	-21.37	-20.37	-20.12	-17.63	-269.03	-326.79	-195.21
	380	30	36	36.22	5.52	15.86	0.59	0.22	0.07	0.12	-24.35	-25.93	-22.15	-18.17	-313.52	-305.48	-193.18
	380	30	54	34.33	4.88	18.04	0.69	0.24	0.04	0.16	-23.41	-18.99	-22.78	-18.31	-319.61	-322.91	-205.27
	380	30	72	36.92	5.04	15.86	0.86	0.20	0.03	0.09	-29.57	-13.47	-30.74	-24.73	-306.47	-276.12	-223.56
	380	30	72	39.98	0	n.d.	n.d.	n.d.	26.23	n.d.	-4.94	n.d.	n.d.	n.d.	n.d.	n.d.	n.d.
	380	30	72	39.37	1.26	0.89	0.06	0.03	15.70	0.01	-22.14	-23.72	-33.76	-28.20	-420.10	nd	nd
	380	30	72	40.56	3.84	9.10	0.45	0.17	1.75	0.09	-23.59	-17.00	-13.76	-13.77	-381.59	-296.53	-355.85
	380	30	72	39.61	5.17	12.03	0.76	0.26	0.04	0.17	-23.86	-24.48	-30.61	-25.30	-329.69	-280.31	-293.20
	380	30	72	41.75	6.86	19.01	0.81	0.23	0.05	0.05	-24.10	-17.14	-23.46	-21.42	-320.66	-222.56	-252.33
	380	30	72	40.79	8.48	33.01	4.58	2.26	0.04	1.18	-22.73	-23.79	-21.90	-23.72	-333.06	-240.58	-232.78