| 摘要: |
| 样品于1992年采自山东广饶盐场，用气相色谱和气质联用等方法对样品进行有机分析。结果表明，盐田表层上（包括藻席）中存在大量的烷烃和芳烃类生物标志物，低Pr／Ph比值（＜0.25）反映植烷存在于姥鲛烷之前，大量不饱和化合物的存在显示了有机质演化的初始状态，也反映了表层土的氧化还原性质。不同层位样品中烷烃和芳烃的含量变化很大，同一剖面烷烃含量最大变幅为：1.73×10-5（表层藻垫）至4.10×10-5（表层下3.5－8.5cm土样），说明有机质在常温常压下即开始了演化过程。大量常见生物标志物的存在，说明生物有机质的最初演化是比较容易的。研究生物有机质在常压常温条件下的演化，也许对生物标志物的研究和油气的地质成因有重要意义。 |
| 关键词: 藻垫 生物标志物 有机地球化学 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目，39490015号 |
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| PRELIMINARY STUDY ON ORGANIC GEOCHEMISTRY OF SALTPOND IN GUANGRAO |
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Wu Shengcai1, Liu Zhili2
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1.Biology Department of Yancheng Teacher’s College, Yancheng 224002;2.Biology Department of Nanjing University, Nanjing 210008
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| Abstract: |
| Samples were collected in 1992 from the Guangrao Saltwork of Shandong Province were analyzed by GC and GC-MS to investigate the composition and precursory evolution of deposited organic matter in the surface layer soil in saltponds. GC-MS analysis data revealed the composition and organization characteristics of alkane and arene in the surface layer of soil (including mat). The low Pr/Ph ratio (< 0.25, Pr could not be detected in some samples) reflected that phytane existed before the pristane appeared. A great amount of unsaturated compounds not only characterized the initial state of organism evolution, but also showed the redox characteristics in the surface layer soil. The variation of concentration of alkane (from 12.5×10-6 in surface soil to 29.4×10-5 in the soil 3.5-8.5cm under the surface) and arene showed that organisms evolution began under normal temperature and pressure. The presence of a great quantity of biomarkers (Ph, Pr, alkane, arene) indicated the organisms evolution was easy in the first stage. The study on the natural evolution of organic matter in normal environment may be significant for research on the biomarkers and geologic origin of oil and gas. |
| Key words: Algal mat, Biomarkers, Organic geochemistry |
