济阳坳陷上古生界烃源岩二次生烃特征

渤海湾盆地济阳坳陷上古生界自形成以来,由于经历了印支期、燕山期和喜马拉雅期复杂的构造运动，其烃源岩的生烃演化具有不连续性和多期性。结合济阳坳陷构造沉积演化史和受热史,运用现代油气地质理论对该坳陷上古生界烃源岩做了研究，认为其具有明显的二次生烃特征,初次生烃发生在中三叠世末,最重要的二次生烃期发生在早第三纪末,此时烃源岩处于高成熟-过成熟阶段,而且二次生烃演化有4种类型,即“中、新生代持续深埋型”、“中生代浅埋、新生代深埋型”、“中生代深埋、新生代浅埋型”和“中、新生代持续浅埋型”。

Secondary Hydrocarbon-Generation Characteristics ofUpper Paleozoic Source Rock in Jiyang Depression

The upper Paleozoic underwent complicated tectonic movement after the Indo-Chinese epoch in the Jiyang depression. The characteristics of the hydrocarbon generating evolution of the upper Paleozoic source rock are inconsecutive and multiphasic. Combining the tectonic-sediment evolution history and heated history, this paper researches the upper Paleozoic source rock in the Jiyang depression by contemporary petroleum geological theory. The upper Paleozoic source rock has obvious secondary hydrocarbon-generation characteristics. The first hydrocarbon generating period is late Middle Triassic, and the most important hydrocarbon generating period is late Early Teriary in which the source rock are highly and over mature. At the same time, four types of secondary hydrocarbon-generation models are concluded.