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大汶口盆地位于山东西南部。大汶口组为一套由泥岩、油页岩、泥灰岩、白云岩及石膏等所组成的湖相沉积。前人认为汶口盒地的“大汶口组”与蒙阴盒地的“官庄组”相当,其时代属始新世—渐新世。大汶口组所含藻类及孢粉化石丰富,根据孢粉组合特征可分为上下两段:下段组合,以麻黄粉属、杉粉属、松粉属发育和栎粉属较多为其特征,菌藻含量很少,其时代为晚始新世—早渐新世;上段孢粉组合,其特征是小亨氏栎粉及污脏棒球藻十分发育,时代属早渐新世。本文初步探讨了根据孢粉颜色判断石油成熟度的问题,将大汶口组孢粉的颜色分为五级,其中以2级桔色及3级棕色占优势,说明有机物已充分受热,达到了生成石油的成熟度,因此可以确定大汶口组是良好的生油层,这对在鲁西南找油提供了依据。
Dawenkou basin is located in southwest Shandong. Dawenkou Formation is a set of lacustrine sediments composed of mudstone, oil shale, marl, dolomite and gypsum. The predecessors thought that the “Dawenkou Formation” in Wenkou Boxe was equivalent to the “Guanzhuang Formation” in the Mengyun box. Its epoch was Eocene-Oligocene. The Dawenkou Formation contains abundant algae and sporopollen fossils. According to the characteristics of sporopollen assemblage, it can be divided into two parts: the lower part is characterized by the development of ephedra, cedar, , The bacteria and algae content is very small, the age of late Eocene - Early Oligocene; the upper sporopollen assemblage, characterized by small Heterodendron and foul dirty algae are well developed, the age is Early Oligocene. In this paper, we first discussed the problem of oil maturity according to the color of sporopollen. The color of sporopollen in Dawenkou Formation was divided into five grades, of which two grades of orange and three grades of brown dominated, indicating that the organics had been fully heated and reached Generate oil maturity, so you can determine the Dawenkou Formation is a good raw oil layer, which provides a basis for oil in the southwest.