A Novel Biomarker Detected in Sediments and Condensates and Its Geochemical Significance
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摘要: 在莺┐琼盆地沉积物和凝析油中首次检出了一种未知化合物(标记为“E”),该化合物很可能是新生物标志物,指示热带海洋水生低等生物的输入,同时还可能作为判别海相有机质成熟度的一个指标。Abstract: A new unknow n compound(arbitrarily labelled”E here) was detected out in sediments and conden-sates from the Ying-Qing Basin, South China Sea. The component is in significantly high abundance in certain samples, and it elutes after 17β(H)一22, 29, 30-trinorhopane in m /z 191 fragmentogram and justafter C28 5α(H),17α(H),21α(H) sterane(22S) in m/z,218 fragmentogram. The spectrum of ompound”E”indicated that compound E is a C29 tetracyclic compound. GC/M S/M S analysis demonstrated thatfragment ions at m /z 191, 218 and 273 do belong to the compound”E".To the best of our knowledge,the compound E is first reported too ccur in sedimentary records. The presence of the compound E is in-ferred to be related to marine organic matter input, which may be a product of specific algal precursorsin a trophic marine depositional environment. In addition to environment significance, the relative con-centration of the compound E in rock extracts was observed to be dependent on the maturity of rocks.
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Key words:
- Ying-Qing basin /
- new marker /
- aquatic organism /
- geochemical significance
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[1] 1 李可为.潘贤庄.南海北部陆架西区油气成因和烃源岩类型.中国海上油气(地质).1990, 4(1): 33-42.
2 张启明等编.莺歌海盆地石油地质论文集.北京:地震出版社.1993, 144.
3 van Aarssen B G K et al. An unusual distribution of bicadtnanes tricadinanes and oligocadinanes in sediments from theYacheng gasfield China. Org Geochem 1992, 18 805-812
4 Chen P H et al. Sequence stratigraghy and continential margindevelopment of the Northwestern 9ielf of South China SeaAAPGRulletin. 1993.77: 842-862 -

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