Research Article
Geochemical Characteristics and Origins of the Crude Oil of Triassic Yanchang Formation in Southwestern Yishan Slope, Ordos Basin
Table 3
Comparative data of steranes in crude oils and source rock samples in Southwestern Yishan Slope.
| | Sample number | Reservoir | Regular Sterane abundance (%) | A | B | C | D | E | F | C27 | C28 | C29 |
| Crude oil | S1 | Chang 1 | 23.1 | 29.4 | 47.5 | 0.19 | 0.38 | 0.13 | 0.51 | 0.55 | 0.54 | S2 | Chang 2 | 24.2 | 28.1 | 47.7 | 0.25 | 0.18 | 0.16 | 0.51 | 0.59 | 0.51 | S3 | Chang 2 | 26.4 | 29.7 | 43.9 | 0.25 | 0.22 | 0.14 | 0.52 | 0.55 | 0.52 | S4 | Chang 2 | 27.1 | 28.6 | 44.3 | 0.26 | 0.19 | 0.14 | 0.49 | 0.53 | 0.45 | S5 | Chang 3 | 26.1 | 28.2 | 45.7 | 0.26 | 0.11 | 0.12 | 0.53 | 0.59 | 0.69 | S6 | Chang 3 | 25.9 | 28.9 | 45.2 | 0.24 | 0.07 | 0.11 | 0.52 | 0.61 | 0.70 | S7 | Chang 4 + 5 | 31.1 | 31.2 | 37.7 | 0.74 | 0.29 | 0.11 | 0.52 | 0.53 | 0.69 | S8 | Chang 4 + 5 | 28.1 | 28.0 | 43.9 | 0.25 | 0.75 | 0.14 | 0.54 | 0.51 | 0.68 | S9 | Chang 6 | 25.3 | 36.0 | 38.7 | 0.29 | 0.19 | 0.14 | 0.54 | 0.59 | 0.67 | S10 | Chang 6 | 23.6 | 28.7 | 47.7 | 0.25 | 0.23 | 0.15 | 0.52 | 0.59 | 0.55 | S11 | Chang 7 | 22.1 | 27.4 | 50.5 | 0.16 | 0.18 | 0.13 | 0.50 | 0.56 | 0.52 | S12 | Chang 7 | 25.9 | 29.3 | 44.8 | 0.26 | 0.24 | 0.14 | 0.55 | 0.58 | 0.56 | S13 | Chang 8 | 23.0 | 30.1 | 46.9 | 0.28 | 0.16 | 0.20 | 0.51 | 0.62 | 0.54 | S14 | Chang 8 | 26.5 | 29.7 | 43.8 | 0.34 | 0.21 | 0.16 | 0.55 | 0.61 | 0.55 | S15 | Chang 8 | 23.7 | 29.9 | 46.4 | 0.19 | 0.14 | 0.21 | 0.53 | 0.58 | 0.52 | S16 | Chang 8 | 24.2 | 29.9 | 45.9 | 0.19 | 0.17 | 0.20 | 0.53 | 0.50 | 0.47 | S17 | Chang 9 | 28.0 | 23.0 | 49.0 | 0.64 | 0.1 | 0.11 | 0.55 | 0.55 | 0.73 | S18 | Chang 9 | 27.0 | 27.0 | 46.0 | 0.8 | 0.07 | 0.08 | 0.53 | 0.63 | 0.62 | S19 | Chang 10 | 30.0 | 30.0 | 40.0 | 0.64 | 0.21 | 0.11 | 0.53 | 0.54 | 0.69 | S20 | Chang 10 | 28.0 | 28.0 | 44.0 | 0.28 | 0.18 | 0.14 | 0.57 | 0.53 | 0.77 |
| Source rock | R1 | Yan 6 | 18.0 | 17.0 | 65.0 | 0.12 | 1.82 | 0.14 | 0.45 | 0.43 | 0.60 | R2 | Yan 7 | 15.0 | 16.0 | 69.0 | 0.05 | 0.20 | 0.13 | 0.45 | 0.43 | 0.59 | R3 | Yan 9 | 16.0 | 17.0 | 67.0 | 0.09 | 0.15 | 0.16 | 0.44 | 0.35 | 0.57 | R4 | Chang 4 + 5 | 24.0 | 22.0 | 54.0 | 0.13 | 0.56 | 0.15 | 0.55 | 0.52 | 0.58 | R5 | Chang 6 | 21.0 | 19.0 | 60.0 | 0.13 | 0.61 | 0.12 | 0.53 | 0.51 | 0.56 | R6 | Chang 8 | 23.0 | 23.0 | 54.0 | 0.63 | 0.06 | 0.11 | 0.51 | 0.51 | 0.72 | R7 | Chang 9 | 23.0 | 19.0 | 58.0 | 0.68 | 0.24 | 0.14 | 0.47 | 0.47 | 0.73 | R8 | Chang 7 | 30.8 | 28.7 | 40.5 | 0.37 | 0.37 | 0.16 | 0.56 | 0.57 | 0.61 | R9 | Chang 7 | 27.7 | 20.8 | 51.5 | 0.12 | 0.34 | 0.16 | 0.55 | 0.54 | 0.59 | R10 | Chang 7 | 29.4 | 25.1 | 45.5 | 0.17 | 0.20 | 0.16 | 0.53 | 0.53 | 0.46 | R11 | Chang 7 | 30.7 | 23.2 | 46.1 | 0.22 | 0.22 | 0.16 | 0.54 | 0.54 | 0.58 | R12 | Chang 7 | 26.9 | 24.9 | 48.2 | 0.18 | 0.26 | 0.16 | 0.55 | 0.56 | 0.60 | R13 | Chang 7 | 30.0 | 24.1 | 45.9 | 0.28 | 0.48 | 0.21 | 0.54 | 0.52 | 0.58 | R14 | Chang 7 | 29.6 | 20.6 | 49.8 | 0.29 | 0.52 | 0.15 | 0.48 | 0.54 | 0.61 | R15 | Chang 7 | 29.0 | 21.0 | 50.0 | 0.53 | 0.39 | 0.10 | 0.47 | 0.61 | 0.56 | R16 | Chang 7 | 27.0 | 31.0 | 42.0 | 0.31 | 0.02 | 0.15 | 0.48 | 0.51 | 0.71 | R17 | Chang 7 | 32.0 | 19.0 | 49.0 | 0.89 | 0.17 | 0.06 | 0.51 | 0.45 | 0.78 |
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A- Steranes/; B-/ Steranes; C- Steranes/ Steranes; D-C29 Steranes 20S/(20S + 20R); E-C29 Steranes ββ/(αα + ββ); F-C29 diasteranes 20S/(20S + 20R).
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