论我国东部第三纪含油气盆地是否存在海侵海漫海啸

Discussions on the presence or absence of seawater encroachment, flooding and tsunami in the Tertiary oil bearing basins in eastern China

本文以沟鞭藻生态为基础，结合我国东部第三纪盆地的地球化学、古生物、岩相古地理、区域地质和全球海平面变化，论证东部含油气盆地在第三纪时不存在海水侵进。出现有“海相”沟鞭藻、有孔虫和钙质超微化石是由于当时湖泊咸化及富养料造成的。同时认为沟鞭藻是广盐性生物，其最适应于半咸水环境。

The integration of geochemistry, palaeontology, sedimentary facies and palaeogeography, regional geology and global sea-level fluctuations shows that seawater encroachments did not occur in the oil-bearing basins in eastern China during Tertiary time. The presence of the 'marine' Dinophyceae,foraminifera and calcareous ultramicrofossils are attributed to the salinized lakes and abundant nutrients. Dinophyceae is a kind of euryhaline organisms,and thus ubiquitous in ponds,lakes,rivers and seas,especially in brackish environments. This implies that caution should be exercised in the application of Dinophyceae as a facies fossil.