Geofluids

Research Article

Deep-Buried Triassic Oil-Source Correlation in the Central Junggar Basin, NW China

Table 3

Biomarker composition of saturated hydrocarbons of Triassic mudstone source rocks in the central Junggar Basin.


Well	Depth (m)	Fm.	Lithology	Type	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18

SM 1	4180	T₃b	Dark gray mudstone	N/A	8.41	33.4	30.6	27.6	0.61	0.21	0.46	0.16	0.17	0.47	0.40	0.11	0.46	0.50	34.0	25.1	41.0	0.17
SM 1	4190	T₃b	Dark gray mudstone	N/A	7.81	32.7	30.5	29.0	0.77	0.22	0.46	0.19	0.17	0.54	0.48	0.12	0.41	0.47	30.6	22.9	46.6	0.21
SM 1	4200	T₃b	Dark gray mudstone	N/A	8.29	33.1	32.5	26.2	0.96	0.23	0.34	0.23	0.20	0.58	0.66	0.10	0.39	0.44	24.9	21.6	53.5	0.18
SM 1	4210	T₃b	Dark gray mudstone	N/A	6.76	27.3	30.7	35.2	0.43	0.28	0.62	0.17	0.15	0.47	0.45	0.13	0.42	0.48	28.2	24.5	47.4	0.16
SM 1	4218	T₃b	Dark gray mudstone	N/A	7.43	32.3	29.4	30.9	0.64	0.34	0.56	0.20	0.19	0.52	0.48	0.14	0.39	0.45	26.9	24.1	49.0	0.19
SM 1	4230	T₃b	Dark gray mudstone	N/A	6.70	30.0	29.9	33.4	0.62	0.22	0.51	0.20	0.17	0.52	0.47	0.12	0.41	0.45	29.2	24.6	46.3	0.12
SM 1	4324	T₂k	Dark gray mudstone	N/A	7.10	30.5	29.5	32.9	0.51	0.22	0.64	0.16	0.18	0.48	0.44	0.14	0.40	0.46	28.1	25.1	46.8	0.14
MS 1	5649.19	T₂k	Sandstone extract	A	8.28	26.5	36.5	28.7	0.31	4.85	2.32	0.21	0.34	0.70	0.40	0.15	0.49	0.64	30.6	25.2	44.2	0.17
MS 1	5796	T₂k	Sandstone extract	A	8.06	21.8	38.6	31.5	0.63	1.23	1.00	0.20	0.13	0.48	0.39	0.09	0.53	0.49	30.2	28.4	41.3	0.15
MS 1	5955	T₁b	Sandstone extract	A	7.99	29.6	35.8	26.6	0.47	1.62	1.49	0.36	0.12	0.77	0.53	0.12	0.44	0.54	27.9	25.4	46.7	0.16
MS 1	5981.48	T₁b	Sandstone extract	A	4.98	20.0	42.3	32.7	0.40	1.32	1.02	0.17	0.14	0.42	0.45	0.14	0.42	0.46	29.3	27.1	43.5	0.22
XY 1	4493	T₁b	Crude oil	B	3.25	20.9	31.6	44.3	0.12	4.89	4.21	0.15	0.16	0.66	0.43	0.36	0.49	0.69	29.7	28.3	41.9	0.13
XY 2	4325	T₂k	Crude oil	B	3.99	24.4	32.0	39.6	0.20	1.78	3.54	0.13	0.20	0.58	0.35	0.32	0.45	0.62	22.0	29.4	48.6	0.10
Da 1	4244	T₂k	Crude oil	B	5.47	27.9	29.1	37.6	0.15	3.15	3.76	0.21	0.13	0.66	0.54	0.28	0.44	0.67	21.9	25.0	53.1	0.09
SM 1	4508.2	T₁b	Sandstone extract	B	2.79	18.6	43.0	35.6	0.15	5.74	7.54	0.11	0.25	0.70	0.46	0.34	0.61	0.73	16.3	19.9	63.8	0.17

Note. Type of end-member oil; N/A, not applicable; 1, C₁₉ tricyclic terpane/ tricyclic terpane (%); 2, C₂₀ tricyclic terpane/ tricyclic terpane (%); 3, C₂₁ tricyclic terpane/ tricyclic terpane (%); 4, C₂₃ tricyclic terpane/ tricyclic terpane (%); 5, C₂₄ tetracyclic terpane/C₂₆ tricyclic terpane; 6, main peak (maximum concentration) of tricyclic terpanes/main peak of hopanes; 7, Ts/Tm; 8, Tm/C₃₀H; 9, C₃₀ moretane/C₃₀ hopane; 10, C₂₉H/C₃₀H; 11, C₃₁H/C₃₀H; 12, Gammacerane/C₃₀ hopane; 13, Sterane C₂₉20/(); 14, Sterane C₂₉ββ/(); 15, Sterane αααC₂₇20/ααα(C₂₇20 + C₂₈20 + C₂₉20) × 100%; 16, Sterane αααC₂₈20/ααα(C₂₇20 + C₂₈20 + C₂₉20R) × 100%; 17, Sterane αααC₂₉20/ααα(C₂₇20 + C₂₈20 + C₂₉20) × 100%, 18-Diasteranes/regular steranes.