| 贵州松河煤矿晚二叠世煤的有机地球化学特征 |
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| 引用本文： | 吴士豪,薄朋慧,徐飞,王炎,陆青锋,秦身钧.贵州松河煤矿晚二叠世煤的有机地球化学特征[J].地质科技通报,2020,39(4):141-149. |
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| 作者姓名： | 吴士豪 薄朋慧 徐飞 王炎 陆青锋 秦身钧 |
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| 基金项目： | 国家自然科学基金项目41472133河北省自然科学基金项目D2018402093河北省高层次人才项目A201802006 |
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| 摘 要： | 以贵州松河煤矿晚二叠世煤层为研究对象，进行了详细的有机地球化学研究。利用偏光显微镜观察煤岩组分和测定镜质体反射率，利用气相色谱（GC）和色谱-质谱联用（GC-MS）分别对煤样中饱和烃和芳香烃进行测定，并计算相关的有机地球化学参数。结果显示，松河煤样镜质组含量最高，镜质体平均反射率（Ro）为1.21%。正烷烃碳数分布范围为C12-C29，主峰碳为C14或C15，∑C21-/∑C22+值较高，奇偶优势指数OEP值接近于1，姥植比（Pr/Ph）在1.40~2.65之间；检测到的芳烃种类较多，以来源于树脂类有机质的萘系和菲系化合物为主，甲基取代同系物中热力学稳定异构体的含量相对较高。分析表明，松河煤的成煤母质主要为陆相高等植物，但也伴随海相低等生物的贡献；煤样成熟度较高，较高的芴系化合物和苯并萘并噻吩含量反映煤层主要形成于还原环境之中。
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| 关 键 词： | 松河 晚二叠世 煤 饱和烃 芳香烃 有机地球化学 |
| 收稿时间： | 2019-04-12 |
Organic geochemistry of the Late Permian coal from the Songhe Mine,Guizhou |
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| Abstract: | The Late Permian coal samples selected from Songhe Mine, Guizhou Province, were investigated by organic geochemical methods. Optical microscopy was used to observe coal components and determine vitrinite reflectance. Saturated hydrocarbons and aromatic hydrocarbons in coals were analyzed by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS), and the related organic geochemical parameters were calculated. The results show that the content of vitrinite in Songhe coal samples is the highest, with the average vitrinite reflectance (Ro) 1.21%. The carbon number of n-alkanes ranges from C12 to C29, and the main peak carbon is C14 or C15. The value of ∑C21-/∑C22+ is higher, and the value of odd-even predominance (OEP) is close to 1, and the pristane/phytane (Pr/Ph) ratio is from 1.40 to 2.65. There are many kinds of aromatic hydrocarbons detected. The contents of naphthalene and phenanthrene compounds derived from resins are predominant, and the isomers of aromatic hydrocarbons with higher thermodynamic stability has an advantage position. The data analyses indicate that the coal-forming parent material is mainly from terrestrial higher plants, accompanied by the contribution of marine phytoplankton. The coal sample has higher maturity. The relative higher contents of fluorenes and benzonaphthothiophenes indicate that coal seams were mainly formed in reducing environment. |
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