Research Article
Geochemistry and Genesis of Oil and Gas Seeps in the Junggar Basin, NW China: Implications for Hybrid Petroleum Systems
Table 2
Molecular geochemical data of oil and gas seeps, selected crude oil, and source-rock samples from the Junggar Basin.
| Number | Sample ID | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| 1 | NW-1 | 0.11 | -28.10 | n.d. | 0.13 | 0.32 | 0.13 | 0.79 | 0.16 | 0.04 | 0.33 | 0.69 | 0.46 | 0.67 | 0.24 | 0.97 | 0.50 | 0.49 | 0.20 | 2 | NW-2 | 0.16 | -27.90 | n.d. | 0.14 | 0.86 | 0.76 | 0.81 | 0.27 | 0.04 | 0.34 | 0.65 | 0.49 | 0.66 | 0.30 | 0.97 | 0.51 | 0.49 | 0.25 | 3 | NW-3 | 0.13 | -27.80 | n.d. | 0.13 | 0.44 | 0.17 | 0.75 | 0.19 | 0.03 | 0.33 | 0.66 | 0.45 | 0.70 | 0.31 | 0.84 | 0.54 | 0.48 | 0.23 | 4 | NW-4 | 0.13 | -27.50 | n.d. | 0.13 | 0.68 | 0.59 | 0.61 | 0.17 | 0.04 | 0.32 | 0.79 | 0.48 | 0.61 | 0.29 | 0.95 | 0.56 | 0.58 | 0.21 | 5 | NW-5 | 0.82 | -28.90 | n.d. | 0.16 | 0.75 | 0.94 | 0.50 | 0.18 | 0.05 | 0.34 | 0.74 | 0.46 | 0.64 | 0.44 | 0.86 | 0.56 | 0.58 | 0.20 | 6 | NW-6 | 0.8 | -28.70 | n.d. | 0.15 | 0.93 | 0.97 | 0.67 | 0.21 | 0.05 | 0.36 | 0.70 | 0.45 | 0.57 | 0.37 | 0.89 | 0.56 | 0.58 | 0.23 | 7 | Ma27 | 0.86 | -30.36 | 1.29 | 0.18 | 0.95 | 0.88 | 0.45 | 0.15 | 0.02 | 0.24 | 0.56 | 0.44 | 0.86 | 0.17 | 0.70 | 0.42 | 0.41 | 0.18 | 8 | FN1 | 0.74 | -31.14 | 0.62 | 0.20 | 0.91 | 0.80 | 0.42 | 0.13 | 0.02 | 0.36 | 0.59 | 0.41 | 0.90 | 0.22 | 0.62 | 0.45 | 0.49 | 0.17 | 9 | FN1 | 0.79 | -30.68 | 0.72 | 0.18 | 0.98 | 0.65 | 0.31 | 0.10 | 0.03 | 0.25 | 0.46 | 0.42 | 0.99 | 0.21 | 0.62 | 0.46 | 0.48 | 0.16 | 10 | SW-1 | 0.95 | -28.60 | 1.30 | 0.76 | 1.34 | 0.81 | 1.83 | 0.11 | 0.98 | 0.15 | 0.64 | 0.38 | 0.49 | 1.11 | 0.41 | 0.49 | 0.49 | 0.41 | 11 | SW-2 | 0.95 | -28.40 | 1.20 | 0.92 | 0.76 | 0.58 | 1.95 | 0.08 | 0.86 | 0.16 | 0.73 | 0.31 | 0.47 | 1.20 | 0.35 | 0.58 | 0.53 | 0.39 | 15 | SW-6 | n.d. | -28.10 | 1.30 | 0.96 | 1.16 | 0.76 | 1.88 | 0.07 | 0.64 | 0.15 | 0.68 | 0.41 | 0.45 | 1.21 | 0.52 | 0.42 | 0.41 | 0.33 | 16 | Ka6 | 0.84 | -28.66 | 1.40 | 0.50 | 0.76 | 0.76 | 1.86 | 0.04 | 0.66 | 0.16 | 0.49 | 0.28 | 0.52 | 1.32 | 0.59 | 0.28 | 0.38 | 0.30 | 17 | GQ1 | 0.88 | -28.38 | 1.12 | 0.63 | 0.45 | 1.09 | 1.01 | 0.04 | 0.54 | 0.15 | 0.53 | 0.20 | 0.56 | 1.35 | 0.47 | 0.25 | 0.34 | 0.34 | 18 | GQ1 | 0.71 | -28.53 | 0.93 | 0.45 | 0.68 | 0.79 | 0.50 | 0.16 | 0.29 | 0.27 | 0.50 | 0.26 | 0.62 | 1.07 | 0.58 | 0.31 | 0.34 | 0.36 | 19 | Ka6 | 0.84 | -27.13 | 2.13 | 1.10 | 1.54 | 0.85 | 3.11 | 0.07 | 0.37 | 0.23 | 0.36 | 0.03 | 0.44 | 0.81 | 0.24 | 0.44 | 0.51 | 0.25 | 20 | SM-1 | n.d. | -30.40 | 0.70 | 0.82 | 0.55 | 0.94 | 0.72 | 0.06 | 1.09 | 0.11 | 0.51 | 0.66 | 0.53 | 1.17 | 0.49 | 0.46 | 0.48 | 0.37 | 21 | SM-2 | n.d. | -30.00 | 0.40 | 0.86 | 0.60 | 0.83 | 0.58 | 0.05 | 1.09 | 0.13 | 0.48 | 0.66 | 0.45 | 1.50 | 0.53 | 0.44 | 0.47 | 0.42 | 22 | SM-3 | n.d. | -29.60 | 0.60 | 0.90 | 0.64 | 0.94 | 0.82 | 0.05 | 1.34 | 0.10 | 0.54 | 0.76 | 0.50 | 1.24 | 0.42 | 0.49 | 0.49 | 0.44 | 23 | SM-4 | 0.9 | -29.90 | 0.50 | 0.72 | 0.63 | 0.88 | 0.62 | 0.04 | 1.31 | 0.10 | 0.49 | 0.71 | 0.54 | 1.19 | 0.50 | 0.49 | 0.50 | 0.42 | 24 | SM-5 | 0.86 | -29.90 | 0.50 | 0.87 | 0.58 | 0.92 | 0.58 | 0.06 | 1.50 | 0.12 | 0.57 | 0.74 | 0.54 | 1.33 | 0.46 | 0.50 | 0.52 | 0.46 | 25 | SM-6 | 0.9 | -30.30 | 0.90 | 0.90 | 0.64 | 0.93 | 0.51 | 0.07 | 1.44 | 0.11 | 0.54 | 0.65 | 0.49 | 1.24 | 0.61 | 0.46 | 0.48 | 0.48 | 26 | SM-7 | 0.84 | -29.30 | 0.60 | 0.74 | 0.74 | 0.93 | 0.50 | 0.05 | 1.49 | 0.11 | 0.56 | 0.66 | 0.51 | 1.17 | 0.62 | 0.48 | 0.50 | 0.42 | 27 | SM-8 | 0.9 | -28.80 | 0.60 | 0.95 | 0.56 | 0.91 | 0.50 | 0.05 | 1.64 | 0.09 | 0.48 | 0.71 | 0.41 | 1.28 | 0.61 | 0.51 | 0.53 | 0.42 | 28 | SM-9 | 0.82 | -28.00 | 1.80 | 1.16 | 0.95 | 1.11 | 1.87 | 0.06 | 0.68 | 0.19 | 0.30 | 0.12 | 0.26 | 0.53 | 0.55 | 0.56 | 0.54 | 0.32 | 29 | SM-10 | 0.85 | -27.80 | 2.40 | 1.12 | 0.97 | 1.07 | 1.86 | 0.06 | 0.67 | 0.18 | 0.33 | 0.12 | 0.37 | 0.56 | 0.54 | 0.54 | 0.52 | 0.26 | 30 | SM-11 | 0.84 | -28.30 | 1.80 | 1.07 | 0.91 | 1.05 | 1.76 | 0.06 | 0.69 | 0.19 | 0.31 | 0.13 | 0.26 | 0.51 | 0.60 | 0.56 | 0.53 | 0.28 | 31 | Huo10 | 0.96 | -30.75 | 0.80 | 0.55 | 0.55 | 0.97 | 0.59 | 0.04 | 1.24 | 0.14 | 0.53 | 0.50 | 0.62 | 1.41 | 0.32 | 0.44 | 0.48 | 0.40 | 32 | TG1 | 0.75 | -30.50 | 0.84 | 0.32 | 0.76 | 0.96 | 0.54 | 0.15 | 1.01 | 0.14 | 0.51 | 0.34 | 0.73 | 1.50 | 0.28 | 0.43 | 0.50 | 0.43 | 33 | SE-1 | n.d. | -29.40 | 1.00 | 0.22 | 0.84 | 0.96 | 0.84 | 0.05 | 0.21 | 0.20 | 0.61 | 0.25 | 0.41 | 0.37 | 0.80 | 0.35 | 0.39 | 0.18 | 34 | Mu5 | 0.95 | -27.39 | 3.82 | 1.04 | 0.87 | 1.15 | 2.43 | 0.03 | 0.45 | 0.23 | 0.40 | 0.06 | 0.42 | 0.83 | 0.42 | 0.41 | 0.54 | 0.37 | 35 | FK1 | 0.78 | -26.28 | 2.50 | 1.38 | 1.44 | 1.08 | 3.66 | 0.13 | 0.53 | 0.19 | 0.39 | 0.10 | 0.32 | 0.83 | 0.30 | 0.42 | 0.47 | 0.28 | 36 | E-1 | 0.33 | -29.80 | n.d. | 0.08 | 0.91 | 1.05 | 1.17 | 0.05 | 0.10 | 0.24 | 0.68 | 0.22 | 0.32 | 0.28 | 0.86 | 0.38 | 0.37 | 0.21 | 37 | E-2 | 0.31 | -29.20 | n.d. | 0.08 | 1.15 | 1.33 | 1.55 | 0.06 | 0.20 | 0.21 | 0.67 | 0.29 | 0.35 | 0.35 | 0.96 | 0.39 | 0.34 | 0.20 | 38 | J251-H | 0.74 | -30.91 | 1.04 | 0.13 | 0.93 | 1.36 | 0.99 | 0.04 | 0.09 | 0.15 | 0.53 | 0.17 | 0.61 | 0.44 | 0.69 | 0.36 | 0.31 | 0.19 | 39 | J174 | 0.78 | -31.31 | 1.35 | 0.11 | 1.08 | 1.05 | 1.28 | 0.04 | 0.07 | 0.11 | 0.52 | 0.19 | 0.67 | 0.60 | 0.81 | 0.30 | 0.27 | 0.16 | 40 | J174 | 0.64 | -30.09 | 1.16 | 0.25 | 0.66 | 1.21 | 1.62 | 0.03 | 0.60 | 0.17 | 0.51 | 0.21 | 0.65 | 0.53 | 0.62 | 0.32 | 0.24 | 0.14 |
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1: SA/SARA; 2: carbon isotopic composition of OM (δ13C in ‰ relative to the VPDB standard); 3: pristane to phytane (Pr/Ph); 4: C19/C20 tricyclic terpanes; 5: C20/C21 tricyclic terpanes; 6: C21/C23 tricyclic terpanes; 7: C24 tetra-/C26 tricyclic terpanes; 8: C24 tetracyclic terpane/C30 hopane; 9: Ts/Tm; 10: Tm/C30 hopane; 11: C29/C30 hopanes; 12: gammacerane/C30 hopane; 13: C35/C3422S hopanes; 14: C27/C28ααα20R regular steranes; 15: C28/C29ααα20R regular steranes; 16: sterane C29ααα20S/(20R+20S); 17: sterane 20RC29αββ/(αββ+ααα); 18: diasteranes/regular steranes. Note that where there is no indication of specific isomers, all isomers were used.
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