垦西-罗家油区稠油成因

ORIGIN OF HEAVY OILS IN KENXI-LUOJIA OIL REGION

陈建渝 李水福 田波 魏世平 杨晓敏

Chen Jianyu Li Shuifu Tian Bo Wei Shiping Yang Xiaomin

水洗和生物降解作用是稠油形成的最重要和最普遍的原因,其强弱主要取决于盆地形成后断裂和不整合面的分布、盆地后期的抬升程度及底水活跃情况。垦西油区的第一类稠油主要因盆地后期抬升,原生油藏接近地表而风化所致,具有高密度、高粘度、高含硫及高凝固点之特征;第二类稠油主要因底水活跃,生物降解作用强烈而形成,具有高密度、高粘度、高含硫和低凝固点特点。

Water flushing and biodegradation are the most important and most common cause of the formation of heavy oils.The degrees of water flushing and biodegradation mainly depend on the distribution of fractures and unconformities within a basin,the degree of the basin's post stage uplift and bottom water activifies.The first kind of heavy oil in Kenxi oil region,resulted from basin uplift and primary oil pool weathering,is characterized by high density,high viscosity,high content of sulphur and high solidifying point;the second kind of heavy oil,resulted from active bottom water and biodegradation,is characterized by high density,high viscosity,high content of sulphur and low solidifying point.

10.11743/ogg19980314