东海陆架盆地西湖、瓯江凹陷下第三系源岩有机显微组份研究

STUDY OF ORGANIC MACERALS IN EOGENE SOURCE ROCKS IN XIHU AND OUJIANG DEPRESSIONS OF EAST CHINA SEA SHELF BASIN

本文采用反射光、反射荧光研究了西湖、瓯江凹陷下第三系源岩有机显微组份。指出生源物主要来自陆生高等植物,其中木质素、纤维素成分占绝对优势。泥岩干酪根样中无定形木质素,纤维素降解物是本区的特征性组份。西湖凹陷平湖地区平湖组的煤样,类脂组含量较高,为不可低估的油气源岩。另外,依据组份特征,对该区的源岩干酪根类型进行划分,并探讨与油气的关系。

The organic macerals from Eogene source rocks in Xihu and Oujiang Depressions are studied in the paper, using reflected light and reflected flourescent light, and it is suggested that the source materials dominated by lignin and cellulose in the area mainly derived from terrestrial higher plants .The degradation products of amorphous lignin and cellulose in kerogen of mudstone are the characteristic compositions of the area. The coal samples containing higher lipitinite from Pinghu Formation of Xihu depression are of source rocks that should not be underestimated. Futhermore, the classifications of sourc rocks for the study area are made according to the characteristics of macerals, and the relation to hydrocarbons is approached.