东营凹陷博兴油田沙四上亚段滩坝砂岩油气富集特征及成藏主控因素  

Hydrocarbon accumulation features and main controlling factors of beach bar sandstone in upper Es_4 formation in Boxing Oilfield,Dongying depression

作　　者：谭丽娟[1] 郭松[1] 

机构地区：[1]中国石油大学地球资源与信息学院,山东青岛266555

出　　处：《中国石油大学学报（自然科学版）》2011年第2期25-31,共7页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家科技重大专项课题(20095009-003)

摘　　要：依据隐蔽油气藏成藏机制,在总结油气富集特征的基础上对东营凹陷博兴油田沙四上亚段滩坝砂岩油气成藏主控因素进行研究。结果表明:沙四上亚段滩坝砂岩油气分布具有严重不均一性,油气主要集中在断裂带以及沉积砂体较厚的坝主体和坝边缘相带;主要存在断层-岩性(物性)复合型油气藏、物性封闭油气藏、岩性上倾尖灭油气藏、断层遮挡油气藏4种油气藏样式;在油源及构造背景相似的前提下,储层物性与非均质程度成为控制该区滩坝砂油气成藏差异性的最主要因素;油气运移基本通道为储层连通孔隙、微层理面与层间界面,存在基本通道侧向输导、基本通道复合微裂隙输导和基本通道复合断裂阶梯状输导3种样式的油气输导体系,砂体展布、构造轮廓以及断裂体系的空间配置决定了油气区域输导指向和油气可能富集的空间位置;成藏动力与成藏阻力的配置对于本区油气成藏差异性分布有一定的控制作用。Guided by the formation mechanism of subtle pools,the controlling factors of hydrocarbon accumulation were discussed in beach bar sandstone from upper Es4 formation in Boxing Oilfield,Dongying depression.The results show that the hydrocarbon distribution was extremely heterogeneous.Hydrocarbon mainly concentrated in the fault belt,the main body and the edge of beach bar which had thick sand.There developed four kinds of oil and gas pools.They are fault-lithologic reservoir,physical sealing reservoir,lithologic pinch-out reservoir and fault reservoir,respectively.On the premise of similar oil source and tectonic setting,physical feature and heterogeneity of the reservoir were the most important factors for controlling hydrocarbon accumulation.Basic migration pathways included interconnected pores,microbedding planes and layer interfaces.In the study area,three kinds of migration systems were lateral migration in basic pathway,migration in basic pathway and microcracks,step-shaped migration in basic pathway and faults.The sand body distribution,structure configuration and space allocation of fault system controlled the regional migration direction and hydrocarbon accumulation location.Moreover,the accumulation dynamics and resistance have some influence on the discrepancy of hydrocarbon occurrence.

关 键 词：东营凹陷 博兴油田 沙四上亚段 滩坝砂岩 油气富集特征 成藏主控因素 

分 类 号：TE122.12[石油与天然气工程—油气勘探]