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.

NumberSample ID123456789101112131415161718

1NW-10.11-28.10n.d.0.130.320.130.790.160.040.330.690.460.670.240.970.500.490.20
2NW-20.16-27.90n.d.0.140.860.760.810.270.040.340.650.490.660.300.970.510.490.25
3NW-30.13-27.80n.d.0.130.440.170.750.190.030.330.660.450.700.310.840.540.480.23
4NW-40.13-27.50n.d.0.130.680.590.610.170.040.320.790.480.610.290.950.560.580.21
5NW-50.82-28.90n.d.0.160.750.940.500.180.050.340.740.460.640.440.860.560.580.20
6NW-60.8-28.70n.d.0.150.930.970.670.210.050.360.700.450.570.370.890.560.580.23
7Ma270.86-30.361.290.180.950.880.450.150.020.240.560.440.860.170.700.420.410.18
8FN10.74-31.140.620.200.910.800.420.130.020.360.590.410.900.220.620.450.490.17
9FN10.79-30.680.720.180.980.650.310.100.030.250.460.420.990.210.620.460.480.16
10SW-10.95-28.601.300.761.340.811.830.110.980.150.640.380.491.110.410.490.490.41
11SW-20.95-28.401.200.920.760.581.950.080.860.160.730.310.471.200.350.580.530.39
15SW-6n.d.-28.101.300.961.160.761.880.070.640.150.680.410.451.210.520.420.410.33
16Ka60.84-28.661.400.500.760.761.860.040.660.160.490.280.521.320.590.280.380.30
17GQ10.88-28.381.120.630.451.091.010.040.540.150.530.200.561.350.470.250.340.34
18GQ10.71-28.530.930.450.680.790.500.160.290.270.500.260.621.070.580.310.340.36
19Ka60.84-27.132.131.101.540.853.110.070.370.230.360.030.440.810.240.440.510.25
20SM-1n.d.-30.400.700.820.550.940.720.061.090.110.510.660.531.170.490.460.480.37
21SM-2n.d.-30.000.400.860.600.830.580.051.090.130.480.660.451.500.530.440.470.42
22SM-3n.d.-29.600.600.900.640.940.820.051.340.100.540.760.501.240.420.490.490.44
23SM-40.9-29.900.500.720.630.880.620.041.310.100.490.710.541.190.500.490.500.42
24SM-50.86-29.900.500.870.580.920.580.061.500.120.570.740.541.330.460.500.520.46
25SM-60.9-30.300.900.900.640.930.510.071.440.110.540.650.491.240.610.460.480.48
26SM-70.84-29.300.600.740.740.930.500.051.490.110.560.660.511.170.620.480.500.42
27SM-80.9-28.800.600.950.560.910.500.051.640.090.480.710.411.280.610.510.530.42
28SM-90.82-28.001.801.160.951.111.870.060.680.190.300.120.260.530.550.560.540.32
29SM-100.85-27.802.401.120.971.071.860.060.670.180.330.120.370.560.540.540.520.26
30SM-110.84-28.301.801.070.911.051.760.060.690.190.310.130.260.510.600.560.530.28
31Huo100.96-30.750.800.550.550.970.590.041.240.140.530.500.621.410.320.440.480.40
32TG10.75-30.500.840.320.760.960.540.151.010.140.510.340.731.500.280.430.500.43
33SE-1n.d.-29.401.000.220.840.960.840.050.210.200.610.250.410.370.800.350.390.18
34Mu50.95-27.393.821.040.871.152.430.030.450.230.400.060.420.830.420.410.540.37
35FK10.78-26.282.501.381.441.083.660.130.530.190.390.100.320.830.300.420.470.28
36E-10.33-29.80n.d.0.080.911.051.170.050.100.240.680.220.320.280.860.380.370.21
37E-20.31-29.20n.d.0.081.151.331.550.060.200.210.670.290.350.350.960.390.340.20
38J251-H0.74-30.911.040.130.931.360.990.040.090.150.530.170.610.440.690.360.310.19
39J1740.78-31.311.350.111.081.051.280.040.070.110.520.190.670.600.810.300.270.16
40J1740.64-30.091.160.250.661.211.620.030.600.170.510.210.650.530.620.320.240.14

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.