苏北盆地泰州组原油有机地球化学特征及成因

苏北盆地泰州组现今仍是一个新的勘探领域，根据苏北盆地海安凹陷泰州组原油的饱和烃和芳烃的馏分组成、分子地球化学参数等油源分析，显示泰州组原油来自泰二段烃源岩，系统阐述了泰州组原油的地球化学特征，并对其沉积环境、成油母质类型、热演化程度及油源进行了讨论。两者具有相似的地球化学特征，甾烷相对丰富，萜烷以藿烷为主，甾烷以规则甾烷占绝对优势。泰州组原油的生油母质主要来源于菌藻类的低等生物，而高等植物则较少；有机质沉积环境整体为咸化、还原环境，但又有所差异，以富安断层为界，断层西北侧盐度高，还原性强，而断层东南侧盐度低，还原性弱；原油成熟度低，处于低熟-未熟阶段。

GEOCHEMISTRY AND GENESIS OF CRUDE OIL OF TAIZHOU FORMATION IN NORTHERN JIANGSU BASIN

Taizhou Formation in Northern Jiangsu Basin is still a new petroleum exploration area now. By analyzing the fractional composition of saturate hydrocarbon and aromatic hydrocarbon and the geochemical parameter of the crude oil, the geochemical characteristics of the crude oil are studied and the sedimentary environment, parent substance, the maturity and the source of the oil are investigated. The geochemistry of the crude oil is similar, the sterane is rich, the main terpane is the hopane and the regular sterane is the main sterane type. It is concluded that the oilforming sources are mainly fungus and algae, not higher plants; the crude oils were formed in reducing and salt water environments, the salinity was higher and the reducibility was stronger in the northwest of Fudong Fault than in the southeast; the crude oil is immature.