济阳坳陷古近纪咸化层段甲藻甾烷和C31甾烷特征

Characteristic of Dinosterane and C_(31) Sterane in Paleocene Saline Formation of Jiyang Depression

通过对济阳坳陷古近纪咸化层段源岩的饱和烃色谱质谱分析发现,沙河街组一段、沙三段和沙四段上亚段源岩中发育了可以指示海侵发生的甲藻甾烷和C31甾烷分子化石,并且C31甾烷通常出现在水体盐度更高、海侵程度更大的环境中,从而推测三个层段的咸化与海相关。

The study on chromatography mass analysis of saturated hydrocarbons in Paleogene saline formation of Jiyang Depression shows that dinosterane and C31 sterane developed in source rocks of the 1 s, member（ Es, ）, the 3^rd member（ Es3 ） and upper the 4＇h member（ Es^U ） of Shahejie Formation, these molecular fossils are marks of marine transgression, moreover C3, sterane denotes that the formation is influenced more by sea water, therefore salinity of 3 members related to marine transgression.