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中上奥陶统海相源岩是塔里木盆地的主要油源岩, 高有机质丰度生油岩发育在台缘-坡灰泥丘相之中. 中等成熟的(等效镜质体反射率0.8%-1.3%)这类油源岩中明显存在两类生烃母质, 表现为两类不同光性有机显微组分. 一是具明显黄色和褐黄色荧光的富氢组分, 主要为结构藻类体、 层状藻类体、 碎屑类脂体, 主要来源于浮游藻类和疑源类; 二是不具荧光的, 光性上类似于镜质体的相对贫氢组分, 显微镜下其形态多呈条带状. 宏观化石和显微有机组分对比分析表明, 镜状体来源于底栖叶状体植物(如较贫氢的褐藻类). 对更多的元古界和下古生界宏观藻化石的有机岩石学分析揭示原始贫氢的有机质在前泥盆系海相源岩中广泛存在, 这是一些浅水碳酸盐岩有机质类型较差(IIB型和III型)的主要原因.
The middle-upper Ordovician marine source rocks are the main source rocks in the Tarim Basin, and the high-organic abundance source rocks are developed in the platform margin-slope plaster facies. The moderately mature (equivalent vitrinite reflectance of 0.8% 1.3%) There are obviously two types of hydrocarbon-generating parent materials in these oil source rocks, which are characterized by two types of different photochemical organic components: one is the hydrogen-rich component with obvious yellow and brown fluorescence, mainly composed of structural algae , Layered algae, debris lipids, mainly from the phytoplankton and suspected sources; the second is non-fluorescent, optically similar to the relatively plastid hydrogen-depleted components, microscopic morphology of the most of the article Banding.Comparison of macro-fossils and microscopic organic components showed that the lenticular bodies originated from the benthic leaf-shaped plants (such as the more dilute hydrogen-rich brown algae) .For more of the Proterozoic and Lower Paleozoic macro algal fossils The organic petrological analysis reveals that the original hydrogen-depleted organic matter is widespread in pre-Devonian marine source rocks, which is responsible for some of the poor organic matter types (type IIB and type III) in shallow-water carbonate rocks.