Geochemical Characteristics and Origins of the Crude Oil of Triassic Yanchang Formation in Southwestern Yishan Slope, Ordos Basin

Table 1

Data of group component of crude oil and source rock samples in Southwestern Yishan Slope.

	Sample number	Reservoir	Deep (m)	Asp (%)	Sat (%)	Aro (%)	non (%)	Sat/Aro	Asp + non (%)
Crude oil	S1	Chang 1	1614.2	1.39	65.18	8.95	24.47	7.28	25.86
	S2	Chang 2	1671.7	1.32	56.51	10.42	31.76	5.42	33.08
	S3	Chang 2	1652.0	2.04	59.49	7.43	31.04	8.01	33.08
	S4	Chang 2	1643.0	1.40	58.57	10.17	29.86	5.76	31.26
	S5	Chang 3	1673.6	2.12	60.52	10.44	26.93	5.80	29.04
	S6	Chang 3	1686.0	1.16	62.19	9.56	27.09	6.51	28.25
	S7	Chang 4 + 5	1732.6	0.38	67.41	6.01	26.20	11.21	26.57
	S8	Chang 4 + 5	1712.0	1.33	56.19	10.05	32.44	5.59	33.77
	S9	Chang 6	1753.7	2.56	64.48	9.93	23.02	6.49	25.59
	S10	Chang 6	1796.1	6.26	53.04	8.90	31.81	5.96	38.07
	S11	Chang 7	1843.3	1.90	65.44	6.56	26.10	9.97	28.00
	S12	Chang 7	1827.0	0.42	76.95	5.98	16.66	12.87	17.08
	S13	Chang 8	1948.4	3.01	43.75	11.99	41.25	3.65	44.26
	S14	Chang 8	1879.1	1.58	63.64	10.94	23.84	5.81	25.42
	S15	Chang 8	1919.4	2.10	64.42	7.55	25.92	8.53	28.03
	S16	Chang 8	1955.7	0.82	76.95	7.69	14.54	10.01	15.36
	S17	Chang 9	2078.5	0.71	67.97	5.58	25.74	12.19	26.45
	S18	Chang 9	1974.2	0.63	72.69	4.21	22.46	17.27	23.10
	S19	Chang 10	2218.7	3.94	62.02	10.39	23.64	5.97	27.59
	S20	Chang 10	2124.0	0.74	69.94	4.61	24.70	15.16	25.44
Source rock	R1	Yan 6	1381.4	42.02	15.88	20.58	21.52	0.77	63.54
	R2	Yan 7	1419.1	20.55	26.52	26.62	26.31	1.00	46.87
	R3	Yan 9	1423.5	4.80	53.67	15.19	26.33	3.53	31.13
	R4	Chang 4 + 5	1689.1	21.92	28.59	30.16	19.33	0.95	41.25
	R5	Chang 6	1730.0	16.50	48.32	20.08	15.10	2.41	31.60
	R6	Chang 8	1945.2	22.79	40.00	20.63	16.58	1.94	39.37
	R7	Chang 9	1970.6	6.97	36.39	30.27	26.37	1.20	33.34
	R8	Chang 7	1723.4	0.58	59.40	7.86	32.16	7.56	32.74
	R9	Chang 7	1746.8	2.12	62.21	8.98	26.69	6.93	28.81
	R10	Chang 7	1813.3	1.87	57.65	9.42	31.06	6.12	32.93
	R11	Chang 7	1837.6	3.51	60.43	9.41	26.65	6.42	30.16
	R12	Chang 7	1823.7	2.63	57.98	6.15	33.24	9.43	35.87
	R13	Chang 7	1786.5	0.94	63.31	11.92	23.83	5.31	24.77
	R14	Chang 7	1803.3	4.14	65.53	9.59	20.74	6.83	24.88
	R15	Chang 7	1867.2	2.05	58.32	9.48	30.15	6.15	32.20
	R16	Chang 7	1783.7	1.93	61.27	6.99	29.81	8.76	31.74
	R17	Chang 7	1795.6	0.73	56.82	5.37	37.08	10.59	37.81

Asp: asphaltene; Sat: saturated hydrocarbon; Aro: aromatic hydrocarbon; non: nonhydrocarbon; Sat/Aro: saturated hydrocarbon/aromatic hydrocarbon; Asp + non: asphaltene + nonhydrocarbon.