通过对保山盆地气源岩有机质饱和烃色谱、三环萜烷、四环萜烷、五环三萜烷及甾烷分布特征的研究,发现气源岩有机质碳数分布存在比较明显的奇碳优势,结合R.数据,认为该区气源岩成熟度很低;可溶有机质生物标志化合物中的三环萜烷、四环萜烷含量低,五环三萜烷中有含量十分丰富的生物藿烷,表明源岩成熟度低;还检测出与细菌作用有关的C<,30>-藿烯,并通过C<,30>-藿烯的含量初步确定研究区1.2 km左右深度为细菌活动的死亡深度;C<,27>、C<,28>、C<,39>规则甾烷具有C<,29>＞C<,27>＞C<,28>的分布特征,为不对称"V"字形与反"L"字形,表现了陆源有机质输入为主的特征;甾/萜比值小,表明细菌对有机质的改造比较强烈.%The investigation on the organic saturated hydrocarbon chromatograph, the pattern of tricyclic terpane, tetracyclic terpane, pentacyclic triterpane and gonane in Baoshan basin shows that the distribution of the organic carbon numbers of source rocks apparently displays an odd carbon number predominance, and the organic matter is on the stage of immature. The content of the tricyclic terpane and tetracyclic terpane of biomarker in structureless organic matter is low, and the pentacyclic triterpane is rich in biogonane. This indicates that the source rock maturity is low. The C30-hopene which has something to do with bacteriological process is also detected. It is preliminarily ascertained that the death depth of bacterial activity in the region of interest is about 1100 m. C27,C28 and C29 regulated gonane has a pattern of C29＞C27＞C28, asymmetric “V” type and reverse “L” type showing that the terrestrial organic matter is mainly characterised by import. The ratio of gonane/terpane is small, manifesting that bacteria reform the organic matter intensely.
展开▼
