【作者】 郑勇；

【导师】 李文厚；

【作者基本信息】 西北大学 ， 矿物学、岩石学、矿床学， 2009， 硕士

【摘要】 惠民凹陷是渤海湾盆地内重要的含油气单元,本文主要是对位于惠民凹陷南斜坡上的曲堤油田西区古近系沙河街组沉积相及砂体展布规律进行研究。经过多年的勘探与研究,曲堤油田已发现一批以构造油气藏为主的油气田。但近年来随着岩性油气藏、古潜山油气藏等隐蔽油气藏的相继发现,认为研究区仍有很大的勘探潜力,这对于曲堤油田的增储上产具有重要意义。在系统研究了曲堤地垒带的基本特征、形成及演化的基础上,以岩心资料、测井资料为主,结合地震资料,根据不同断块的特征各自建立标准井,并以标准井为中心,结合邻井进行追踪和对比,将该区200余口井的目标层位进行了系统的地层划分与对比,将沙河街组自上而下划分为沙一段、沙二段、沙三段、沙四上、中、下亚段。通过对该区沉积岩的矿物组成、沉积构造、古生物学特征以及地球物理特征等沉积相标志的综合研究判断,认为研本区沙河街组主要发育冲积扇、河流、三角洲、湖泊四种沉积体系。识别出研究区沙四下亚段主要发育扇中—扇端亚相;沙四上、中亚段主要发育曲流河亚相,局部受断层控制而发育小型冲积扇;沙三、沙二段主要发育三角洲前缘亚相;沙一段主要发育浅湖亚相。利用阴极发光、轻重矿物分析、岩屑分析、砂砾岩百分含量分析等方法确定了研究区物源主要来自于东南方向鲁西隆起的前寒武纪片麻岩和古、中生代以及新生代的花岗岩。并在此基础上,以石油地质学、沉积学等理论为指导,结合单井、连井沉积学分析,利用单优势相作图的方法,编制沙一至沙四段(包括沙四上、中、下亚段)的岩相古地理图,并结合沉积相联井剖面对比图详细研究了各层段的沉积相与砂体展布特征。更多还原

【Abstract】 Huimin depression is important oil and gas bearing basin in Bohai Bay Basin. Sedimentary facies and distribution of sand bodies of the Shahejie formation in the west Qudi oil field, that is located in the south slope of Huimin depression, were systematieally studied. After many years of exploration and research, many oil and gas fields based on structural reservoir have been diseovered. In recent years, with many sequent discoveriesof elusive reservoir, such as stratigraphic reservoir and ancient buried hill hydrocarbon reservoir, we believe there is still much potential for exploration in Qudi oil field, and these discoveries will exert a profound enfluence on the output of reserves.Based on the comprehensive research of basic characteristics, formation and evolution in Qudi oil field, from studying some data of well drilling, logging and seismic, the typical well depending on the characteristics of fault-block has been set up, and 200 wells’ stratum in the study area have been divided and compared. Shahejie formation has been divided into Es1, Es2, Es3 Es4S, Es4Z, Es4X.Based on the study of facies indicators of sedimentary structure, Biological characteristics and geophysical signature, 4 depositional system including alluvial fan , fluvial, delta, lacustrine developed in Shahejie formation, and the mid-fan,end-fan, mainly developed during the depositional Period of Es4X, meandering river- Miniature alluvial fan mainly developed during the depositional Period of Es4S- Es4Z,delta front developed during the depositional Period of Es3- Es2, shallow lake mainly developed during the depositional Period of Es1.From analyses of cathodeluminescence, light mineral, heavy mineral and cuttings, the provenance system that mainly comes from west Shandong uplift and mainly direction is south-east trending has been comfirmed. On the basis of provenance system, under the guidance of Petroleum Geology and Sedimentology theory, according to the sand content chorisopleth and the distribution of sand thickness, lithofacies paleogeography maps of Es1-Es4(including ESsS,Es4Z,Es4X) have been drawn, and sedimentary facies, unfold characters of sandstones have been detailly study.更多还原