0 引言
1 样品与实验
1.1 样品
表1 热模拟实验原始样品地球化学参数Table 1 Geochemical parameters of original sample in pyrolysis experiments |
| 参数 | TOC /% | R O /% | S 1 /(mg/g) | S 2 /(mg/g) | T max /℃ | 母质 类型 | I H /(mg/g) |
|---|---|---|---|---|---|---|---|
| 值 | 3.87 | 0.58 | 1.61 | 15.78 | 439 | Ⅰ | 468 |
1.2 热模拟实验
表2 热模拟实验条件及残余岩样实测镜质体反射率Table 2 Experiment conditions and the value of vitrinite reflectance of residual rock samples after pyrolysis experiments |
| 模拟温度/℃ | 地层压力/MPa | 静岩压力/MPa | 样品量/g | 实测R O /% |
|---|---|---|---|---|
| 原样 | 0.58 | |||
| 280 | 21.00 | 50.00 | 60.15 | 0.70 |
| 325 | 23.00 | 55.00 | 58.30 | 1.01 |
| 355 | 28.00 | 67.00 | 60.31 | 1.34 |
| 385 | 33.00 | 79.00 | 55.13 | 1.48 |
| 445 | 39.00 | 94.00 | 56.35 | 1.95 |
1.3 连续抽提和GC-MS分析
2 结果与讨论
2.1 热模拟原始样品饱和烃特征
图1 原始样品DOM 1和DOM 2中饱和烃的m/z 85、191、217质量色谱Fig.1 The m/z 85, 191, 217 mass chromatograms of saturated hydrocarbons in the DOM 1 and DOM 2 of the original sample |
表3 不同热模拟温度滞留油DOM 1和DOM 2中母质类型与沉积环境参数Table 3 Parameters related to organic matter source and depositional environment in retained oil DOM 1 and DOM 2 at different thermal simulation temperatures |
| 可溶有机质 | 温度/℃ | R O/% | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DOM 1 | 原样 | 0.58 | 0.93 | 1.92 | 0.85 | 0.63 | 0.64 | 0.51 | 0.47 | 0.06 | 0.02 |
| 280 | 0.70 | 0.86 | 1.76 | 0.83 | 0.63 | 0.65 | 0.49 | 0.46 | 0.06 | 0.02 | |
| 325 | 1.01 | 0.72 | 1.66 | 1.15 | 0.61 | 0.52 | 0.56 | 0.52 | 0.07 | 0.02 | |
| 355 | 1.34 | 0.53 | 1.53 | 2.27 | 0.67 | 0.45 | 0.80 | 0.59 | 0.10 | 0.04 | |
| 385 | 1.48 | 0.70 | 2.36 | 3.86 | 0.71 | 0.68 | 1.64 | 0.60 | 0.60 | 0.06 | |
| 445 | 1.95 | 1.83 | 6.24 | 0.48 | 0.47 | 1.39 | 1.62 | 0.86 | 0.92 | 0.10 | |
| DOM 2 | 原样 | 0.58 | 0.58 | / | 0.10 | 0.47 | 1.49 | 0.74 | 0.32 | 0.14 | 0.04 |
| 280 | 0.70 | 0.50 | / | 0.29 | 0.54 | 1.03 | 0.75 | 0.29 | 0.07 | 0.03 | |
| 325 | 1.01 | 0.73 | / | 0.44 | 0.52 | 1.16 | 0.97 | 0.51 | 0.14 | 0.04 | |
| 355 | 1.34 | 0.54 | / | 0.61 | 0.56 | 1.09 | 1.40 | 0.44 | 0.28 | 0.05 | |
| 385 | 1.48 | 0.75 | / | 0.50 | 0.43 | 2.16 | 2.33 | 0.50 | 2.33 | 0.11 | |
| 445 | 1.95 | 3.83 | / | 0.34 | 0.44 | 1.84 | 1.88 | 0.45 | 2.47 | 0.07 |
|
2.2 抽提物产率和族组成特征
图3 原始样品和不同温度点残样分级抽提产率分布特征Fig.3 Sequential extraction yields characteristics of original and residual samples at different temperatures |
表4 原始样品和不同成熟度固体残样分级抽提产率及族组成Table 4 Yield and the percentages of saturates, aromatics, resins, and asphaltenes of sequential extractions for original and solid residual samples of different maturity |
| 实验温度 /℃ | 实测R O /% | 可溶有机质 | 抽提产率 /(mg/g岩石) | 可溶有机质占比/% | 饱和烃/% | 芳烃/% | 非烃/% | 沥青质/% |
|---|---|---|---|---|---|---|---|---|
| 原样 | 0.58 | DOM 1 | 3.44 | 80.53 | 55.00 | 14.29 | 22.14 | 8.57 |
| DOM 2 | 0.83 | 19.47 | 30.00 | 15.00 | 20.00 | 35.00 | ||
| 280 | 0.70 | DOM 1 | 3.67 | 83.75 | 52.57 | 17.14 | 23.43 | 6.86 |
| DOM 2 | 0.71 | 16.25 | 21.59 | 17.05 | 27.27 | 34.09 | ||
| 325 | 1.01 | DOM 1 | 5.03 | 84.02 | 33.55 | 13.16 | 26.97 | 26.32 |
| DOM 2 | 0.96 | 15.98 | 20.22 | 19.10 | 26.97 | 33.71 | ||
| 355 | 1.34 | DOM 1 | 4.43 | 82.54 | 22.63 | 13.16 | 35.26 | 28.95 |
| DOM 2 | 0.94 | 17.46 | 23.85 | 20.00 | 26.15 | 30.00 | ||
| 385 | 1.48 | DOM 1 | 2.92 | 52.76 | 26.19 | 16.67 | 22.02 | 35.12 |
| DOM 2 | 2.61 | 47.24 | 36.36 | 31.82 | 15.91 | 15.91 | ||
| 445 | 1.95 | DOM 1 | 0.44 | 50.18 | 6.45 | 35.48 | 38.71 | 19.35 |
| DOM 2 | 0.44 | 49.82 | 38.89 | 41.67 | 13.89 | 5.56 |
2.3 热演化程度对不同极性溶剂抽提物中生源参数的影响
2.3.1 正构烷烃
2.3.2 萜烷
2.3.3 甾烷
图9 滞留油DOM 1和DOM 2中甾烷(m/z 217)质量色谱Fig.9 The mass chromatograms of sterane (m/z 217) in the DOM 1 and DOM 2 of retained oils |

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