辽河油田东部凹陷中段火山岩油气藏成藏特征

Hydrocarbon accumulation characteristics of volcanic rock reservoir in middle segment of Eastern sag of Liaohe oilfield

在对辽河油田东部凹陷油源条件、储层条件、盖层条件、运移条件、圈闭条件及储盖组合等油气藏成藏条件系统分析的基础上,建立了该地区火山岩油气藏的成藏模式。认为火山岩形成早、临近油源、火山活动时间短及断裂活动强是火山岩油气藏形成的独特条件。研究区火山岩油气藏成藏模式主要有以垂向运移为主、侧向运移为辅的中央断裂背斜带的构造—岩性油气藏模式和以侧向运移为主、垂向运移为辅的驾掌寺断层以东的岩性油气藏模式。

Based on systemic analysis of essential factors of hydrocarbon accumulation such as source rock, reservoir, cap rock, hydrocarbon migration, trap and reservoir-seal relationship in Eastern sag, the accumulation models of volcanic rock reservoir of this area was established. It shows that volcanic rock has the characteristics of being formed early, adjacent to source rock, short time of volcanic activity and strong faulting activities, which are special conditions for hydrocarbon accumulation of volcanic rock reservoir. Two main hydrocarbon accumulation models of volcanic rock reservoir in the study area are structural-lithologic reservoir model and lithologic reservoir model. The former is located in the anticlinal zone of median fault belt and dominantly characterized by vertical migration, the later is in the east of Jiazhangsi Fault and dominantly characterized by lateral migration.