鄂尔多斯盆地伊陕斜坡中部长6油层组沉积微相及其含油性研究  

Study on Sedimentary Microfacies and Its Oil-Bearing Properties in Chang 6 Member in the Middle Part of Yi-Shan Slope in Ordos Basin

作　　者：马强[1] 屈红军[1] 严耀祖[2] 胡春花[1] 白国娟[1] 

机构地区：[1]西北大学大陆动力学国家重点实验室西北大学地质学系,西安710069 [2]中国石油勘探开发研究院西北分院,兰州730020

出　　处：《沉积学报》2009年第3期443-451,共9页Acta Sedimentologica Sinica

摘　　要：研究区位于鄂尔多斯盆地伊陕斜坡中部,延长组长6油层是研究区主要目的油层,因此了解其沉积相类型及平面展布,探讨沉积微相与油气分布的关系,对勘探开发有指导意义。以岩芯及野外剖面观察为基础,通过岩石相、测井相、粒度和薄片鉴定资料的综合分析,揭示出研究区长6油层为三角洲前缘亚相,并可以细分为水下分流河道、河口坝、水下分流间湾、席状砂、水下决口扇和水下天然堤6个沉积微相,分析了各小层沉积微相的平面展布规律;在此基础上,首次将定量统计学方法应用于含油砂体沉积微相的分析,研究表明,长6油层的油气主要赋存在水下分流河道砂体及水下分流河道与河口坝组合砂体中,在层位上又以长61为主,是下一步主要勘探目标。The studied area is located in the middle part of Yi-shan slope in Ordos basin, and Chang 6 is the main target oil-layer. Understanding the sedimentary microfacies and the relationship between sedimentary microfacies and oil-gas distribution is of guiding importance to oil and gas exploration and development. By analyzing the data of drilling cores, logging, image granularities as well as casting thin sections, it can be concluded that delta front subfacies is the main sedimentary subfacies of Chang 6, which includes 6 kinds of microfacies including underwater distributary channel, river mouth bar, interdistributary bay, sheet sandstones, underwater burst fan and natural levee. The distribution of sedimentary microfacies is analysed also. Furthermore, quantitative statistics was used in the analysis of it~ oil-beating properties of sedimentary microfacies in oil-beating bodies. The study shows that the oil in Chang 6 mainly developed in the underwater distributary channel sand and combined sand from the underwater distributary channel and fiver mouth bar, and Chang 61is the main oil-bearing layer, which is the main target of oil and gas exploration.

关 键 词：伊陕斜坡中部 延长组 长6油层 沉积微相 含油砂体 

分 类 号：TE122.2[石油与天然气工程—油气勘探] P512.2[天文地球—地质学]