海拉尔盆地乌尔逊凹陷下白垩统层序构成样式分析及油气藏预测  

Analysis on the sequence components and forecast of hydrocarbon reservoirs of Early Cretaceous of Wuerxun depression in Hailar Basin

作　　者：刘赫[1,2] 李军辉[2] 张祥国[3] 

机构地区：[1]东北石油大学地球科学学院,黑龙江大庆163318 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [3]大庆油田有限责任公司海拉尔勘探开发指挥部黑龙江大庆163712

出　　处：《地质科学》2011年第4期983-993,共11页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目(编号:2008E-1209)资助

摘　　要：乌尔逊凹陷是海拉尔盆地主要油气勘探和开发区之一。对乌尔逊凹陷下白垩统层序构成样式和沉积充填的综合研究表明,盆地的充填序列受构造演化的控制,具有明显的阶段性。在盆地幕式断陷活动和同沉积断裂差异断陷活动等构造作用下,形成了断控陡坡型、缓坡断阶型和洼槽型3种层序构成样式,它们制约了沉积物的分散过程和砂体堆积,对乌尔逊凹陷层序样式和沉积体系形成分布起到重要的控制作用。结果表明,不同的构造单元具有各自特征的层序构成样式和沉积体系域构成模式,不同类型层序构成样式也决定了不同的构造单元具有不同的油气藏类型。在断控陡坡带主要发育断鼻和断层—岩性型油气藏,在缓坡断阶带发育地层、断块和断层—岩性型油气藏,在洼槽带主要发育自生自储型的透镜体油气藏,此外,洼槽边缘可发育断层—岩性型油气藏。Wuerxun depression is one of the main oil and gas exploration and development zones in Hailar Basin.Comprehensive research on sequence architecture and depositional filling of Early Cretaceous shows that filling sequences are controlled by tectonic evolution and have distinct phases.Under the tectonism of the episodic faultdepressing activities and the different activities of synsedimentary fracture etc,the sequence configuration can be divided into three types：steepslope type,faultedterrace type and sag type,which control the sediment dispersion process and sand accumulation and play an important role for the sequence architecture and formation and distribution of sedimentary system of Wuerxun depression.Results show that different tectonic units have respective characteristic of the sequence style and depositional system,different types of the sequence pattern also determine different tectonic units with different kinds of reservoirs.The fault controlled steepslope area mainly develops faultnose and faultslithologic reservoirs,faultedterrace belt in gentle slope area develops fault blocks and faultslithologic reservoirs,sag belt mainly develops sand lens reservoirs,in addition,the margin of sag belt probably develops faultlithologic reservoirs.

关 键 词：乌尔逊凹陷 下白垩统 层序构成样式 沉积充填 油气藏 

分 类 号：P618.13[天文地球—矿床学] TE121[天文地球—地质学]