陕北斜坡东部三叠系油气富集规律研究  

Regularity of Triassic petroleum accumulation and distribution in the east part of North Shaanxi Slope

作　　者：赵靖舟[1] 武富礼[1] 闫世可 顾根深[2] 郭德运[3] 杨县超[3] 

机构地区：[1]西安石油大学油气资源学院,陕西西安710065 [2]延长石油集团公司,陕西延川717208 [3]西北大学,陕西西安710069

出　　处：《石油学报》2006年第5期24-27,34,共5页Acta Petrolei Sinica

基　　金：教育部"新世纪优秀人才支持计划"资助(NCET-05-0876)

摘　　要：陕北斜坡东部三叠系构造简单,为平缓的西倾单斜,断裂褶皱均不发育,因此该区三叠系油藏的形成和分布一直被认为主要受沉积相控制,油藏类型主要为岩性油藏。研究结果表明,陕北斜坡三叠系油藏的形成与富集实际上受沉积相带、鼻状隆起背景、运移通道、水动力等多重因素控制。鼻状隆起背景的存在是中生界油气藏形成和富集的一个重要条件,大中型油田的形成均与一定规模的鼻状隆起背景有关。对延长组上部长1-长2-长3成藏组合以及侏罗系成藏组合而言,断裂及裂缝等垂向运移通道对其油气藏形成和分布具有重要控制作用,水动力则是三叠系油藏形成的一个重要圈闭因素。因此,陕北斜坡东部三叠系油藏的类型复杂多样,除岩性油藏外,构造-岩性、构造-水动力等复合油藏是该区三叠系油藏的主要类型。The Triassic structure in the east part of North Shaanxi Slope of Ordos Basin is a large smooth westward monocline and characterized by simple structure without folds and faults. Accordingly, the Triassic petroleum accumulation and distribution in the North Shaanxi Slope has been regarded as mainly being controlled by sedimentary facies, and therefore the types of the reservoir are lithologic, on which the structural and other factors are believed to have no important effect. Nevertheless; the present study shows that the formation and enrichment of the Triassic reservoir in North Shaanxi Slope of Ordos Basin are actually controlled by multiple factors, such as sedimentary facies, background of nose-shaped uplift, migration pathway, regional cap-rocks and hydrodynamics. Especially, the background of nose-shaped uplift is an important condition for the formation and enrichment of the Mesozoic reservoir. The formation of the mid-large oil fields has close relations with such a structural background. For the accumulation combination of Chang 1 ,Chang 2 and Chang 3 of Yanchang Formation and Jurassic,the faults especially fractures as migration pathways have significant effects on the formation and distribution of the Mesozoic reservoir. Hydrodynamics is an important trap factor for the Triassic reservoir. Consequently, the types of the Triassic reservoir are complicated and variable. In addition, the structural-lithologic and structural-hydrodynamic composite reservoirs are possibly the main types of the Triassic reservoir in the North Shaanxi Slope of Ordos Basin.

关 键 词：鄂尔多斯盆地 陕北斜坡 三叠系油藏 油气分布规律 油藏类型 

分 类 号：TE112.33[石油与天然气工程—油气勘探]