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

Table 4

Comparative data of Terpanes in crude oil and source rock samples in Southwestern Yishan Slope.

	Sample number	Reservoir	A	B	C	D	E	F	G
Crude oil	S1	Chang 1	0.72	0.51	0.46	21.5	2.14	0.04	0.57
	S2	Chang 2	0.76	0.50	0.51	22.5	0.55	0.05	0.56
	S3	Chang 2	0.80	0.52	0.49	25.9	0.65	0.04	0.56
	S4	Chang 2	0.76	0.52	0.48	26.5	0.70	0.05	0.58
	S5	Chang 3	0.70	0.50	0.38	26.4	0.89	0.05	0.57
	S6	Chang 3	0.71	0.47	0.44	26.3	0.78	0.05	0.58
	S7	Chang 4 + 5	0.67	0.49	0.44	24.8	1.03	0.04	0.57
	S8	Chang 4 + 5	0.68	0.42	0.35	23.0	9.79	0.04	0.52
	S9	Chang 6	0.69	0.42	0.45	23.2	0.56	0.06	0.54
	S10	Chang 6	0.72	0.53	0.48	22.6	0.52	0.05	0.57
	S11	Chang 7	0.68	0.40	0.48	20.3	0.32	0.03	0.57
	S12	Chang 7	0.71	0.48	0.50	24.2	0.59	0.05	0.55
	S13	Chang 8	0.64	0.30	0.38	23.4	0.76	0.06	0.59
	S14	Chang 8	1.05	0.43	0.46	21.3	1.00	0.05	0.55
	S15	Chang 8	0.44	0.42	0.45	23.8	0.93	0.04	0.58
	S16	Chang 8	0.58	0.38	0.45	21.1	0.89	0.06	0.56
	S17	Chang 9	0.69	0.44	0.26	28.0	5.86	0.04	0.42
	S18	Chang 9	1.03	0.47	0.23	24.0	1.23	0.02	0.54
	S19	Chang 10	0.98	0.45	0.25	19.0	6.46	0.04	0.45
	S20	Chang 10	0.78	0.45	0.35	22.0	4.26	0.05	0.55
Source rock	R1	Yan 6	2.57	0.96	0.81	29.0	0.05	0.03	0.59
	R2	Yan 7	3.14	0.56	0.76	40.0	0.03	0.02	0.58
	R3	Yan 9	3.75	0.72	0.81	28.0	0.04	0.03	0.57
	R4	Chang 4 + 5	1.71	0.61	0.64	29.0	3.61	0.06	0.59
	R5	Chang 6	3.03	0.68	0.81	30.0	0.70	0.05	0.60
	R6	Chang 8	1.05	0.58	0.48	20.0	0.96	0.10	0.60
	R7	Chang 9	1.96	0.46	0.23	26.0	4.45	0.10	0.47
	R8	Chang 7	0.88	0.38	0.47	32.1	3.92	0.13	0.54
	R9	Chang 7	1.14	0.53	0.65	27.4	0.94	0.03	0.57
	R10	Chang 7	0.90	0.40	0.58	25.7	1.29	0.04	0.56
	R11	Chang 7	1.51	0.43	0.70	18.4	1.30	0.03	0.57
	R12	Chang 7	0.78	0.45	0.49	27.2	0.98	0.04	0.56
	R13	Chang 7	1.56	0.33	0.40	31.6	3.89	0.08	0.56
	R14	Chang 7	1.38	0.50	0.45	35.7	2.63	0.08	0.58
	R15	Chang 7	1.45	0.52	0.30	31.0	2.51	0.12	0.61
	R16	Chang 7	1.00	0.52	0.52	20.0	3.74	0.07	0.58
	R17	Chang 7	0.95	0.53	0.47	26.0	1.71	0.08	0.57

A-(C₁₉ tricyclic Terpanes + C₂₀ tricyclic Terpanes)/C₂₃ tricyclic Terpanes; B-C₂₅ tricyclic Terpanes/C₂₆ tricyclic Terpanes; C-C₂₄ tetracyclic Terpanes/(C₂₄ tetracyclic Terpanes + C₂₆ tricyclic Terpanes); D-∑ > C₃₀ Hopanes abundance (%); E-Ts/Tm; F-Gammacerane/αβ-C₃₀ Hopanes; G-C₃₁ Hopanes 22S/(22S + 22R).