关键词: 东濮凹陷, 早第三纪, 微古生物学, 孢粉, 沟鞭藻纲, 化石, 丰度, 干酪根类型, 生油岩评价, 油气藏形成

Abstract: This article summarizes the total abundance of six phyla of sporopollen,dinoflagellate fossils etc.in the vertical section,presents a detailed study on the distribution of dinoflagellates and green algae in horizontal direction,and shows that microbiota summit pe-riods corresponds to two sets of reservoir beds in Dongpu Depression respectively.In accordance with 500 samples of source rocks in different areas and series,the author sums up the kerogen types and abundance of the organic matter in the source rock,and come to a conclusion,i.e,type Ⅰ or Ⅱ₁ will occur in case that source rock contains abundant dinoflagellate and green algae.In a formation composed of an alternatively deposited sand and shale layers,oil and gas reservoirs can be found provided that these organisms are ma-tured and favorable trapping condition exists.