Identification of C19C29 Steranes and 25norhopanes in Source Rock and Geological Significance
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摘要: 沉积有机质中通常可检测到C21(孕甾烷)、C22(升孕甾烷)和C27~C29甾烷,但C19、C20和C23~C26甾烷并不常见。在三塘湖盆地芦草沟组黑色页岩中检出了完整的C19~C29甾烷系列和25降藿烷系列。如此完整且丰度较高的此类化合物,尚无文献报道。这一新的资料可能蕴含着丰富的油气地球化学信息。初步认为这2个系列的化合物指示:其古环境为干旱和咸化水体环境;有机质以藻类和浮游生物等低等水生生物来源为主,在沉积初期遭受强烈的生物降解作用;原始有机质与细菌降解的产物共存,成为生烃先质。
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关键词:
- 三塘湖盆地 /
- 烃源岩 /
- C19~C29甾烷 /
- 25降藿烷 /
- 生物降解
Abstract: Sterane series compounds such as C21,C22 and C27~C29 can be usually detected in sediments, however, C19,C20,C23~C26 steranes rarely occur in above geologic body. The C19~C29 sterane series and C26~C29 25norhopanes are detected of high abundance in blackshale sample from Lucaogou Fomation, Santanghu Basin. Such abundant compounds contain much information in oilgas geochemistry research, but until now, few research works have been carried out in the world. Based on our detail studies, a conclusion has been reached that the two series compounds can indicate arid and salinelake environment, and the low hydrobiont of algae and plankton are well developed. The organic matters in sediments suffer severe biodegradation, and then the products of biodegradation and the original organic matter are preserved well and become into the precursor of hydrocarbons.-
Key words:
- Santanghu Basin /
- source rock /
- C19~C29 steranes /
- 25norhopanes /
- biodegradation
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