【作者】 康立明；

【导师】 任战利；

【作者基本信息】 西北大学 ， 地球探测与信息技术， 2008， 博士

【摘要】 本论文以鄂尔多斯盆地韩渠-张天渠油田生产层位延长组和延安组储层为研究对象,综合运用地质、开发、沉积学、测井、油藏工程、现代油水井测试和室内实验等多学科、多视角的研究为一体,动态与静态相结合,对研究区沉积相、微构造、储层、流动单元及剩余油分布规律做了详细、深入研究,完善与发展了一套针对鄂尔多斯盆地构造-岩性油藏剩余油分布及油藏描述研究的技术思路和方法,并将为同类油藏开展油藏描述提供较好的借鉴。取得的主要认识与结论:1.研究区以前归个人开发,资料不全,地层划分标准不统一,本次克服各种困难,首次详细地将本区延安组和延长组地层应用统一标准划分为延8、延9¹、延9²、延10¹、延10²、长1、长2^1-1、长2^1-2、长2^1-3、长2²、长2³共计11个小层,建立了全区详细的地层格架;2.首次对本区延安组和延长组各个小层微构造进行了详细深入系统的研究,提出了储层受沉积后的差异压实作用和构造应力作用形成了不同的微构造类型,精细刻画出了微构造平面和剖面上的变化规律,并对微构造对油气富集和对剩余油分布的机理进行了研究;3.对本区储层沉积特征、岩石学特征、古生物特征、测井地质学特征、砂体几何学特征进行了系统的分析,认为延安组是河流相沉积,延长组是三角洲平原沉积,这与以往的认识有所不同,以前认为该区延安组也是三角洲平原沉积。对每个小层沉积微相类型、展布特征进行了精细描述,并研究了不同沉积体的岩电特征,总结出本区四种基本测井相模式;4.首次对本区储层岩石学特征、孔喉结构特征、成岩作用、非均质性、含油性、电性特征、相渗特征、水驱油特征、润湿性等进行了综合研究,在此基础上深入、全面、细致地刻画了韩渠-张天渠储层延安组和延长组层内、层间和平面非均质性、含油饱和度及流动单元在平面和剖面上展布特征及变化规律,并对其影响因素也作出了分析。在储层综合研究的基础上制定了本区储层分类标准,将本区储层分为三类,并对每个小层类别进行了划分。认为韩渠—张天渠延9、长1和长2油层组储层以Ⅲ类差储层为主,延10油层组储层以Ⅱ类中等储层为主。为开发方案的制定及调整奠定了基础,对今后油田滚动勘探及注水开发有重要的指导意义;5.对储层流动单元进行了深入的分析,在前人研究的基础上,将地质、工程与开发,静态与动态相结合,用多参数聚类分析的新方法定量地对流动单元进行划分,使划分标准更加合理,将本区流动单元划分了四种类型,并分析了不同流动单元与沉积微相、剩余油分布及开发间的关系;6.对油藏圈闭类型及驱动类型进行了系统分析。认为延安组和延长组圈闭类型主要为构造—岩性圈闭和岩性圈闭,驱动类型延安组以边底水驱动为主、延长组以弹性—溶解气驱动为主;7.对本区剩余油分布类型和特征进行了系统研究,提出了剩余油的形成主要因素包括两部分,一是油藏非均质性,二是开采的非均质性。指出剩余油分布主要受沉积微相控制:平面上剩余油主要分布在河道边缘或河道间的薄砂层中;长2^1-1、长2²开采时间较晚,开采程度低,剩余油在平面上主要分布在有利的相带上,即主要分布在砂体较厚的主河道上;剖面上延安组和延长组都是正旋回沉积,下部孔、渗均好于上部,这样在注水的过程中,下部水洗程度就较高,造成上部剩余油分布较多。更多还原

【Abstract】 Yanan group and Yanchang group of Han-zhang Oil Field in Ordos Basin was taken as the study object in this thesis.Multi-discipline such as reservoir geology,development, sedimentology,logging,reservoir engineering,modern oil well testing and indoor experiments were integrated,performance and static state were united to deeply research sedimentary facies,microtectonics,reservoir,flow unit and oil remaining,and to develop a set of research ideas and technologies on the remaining oil distribution and reservoir description in the structure-lithology reservoir in Ordos Basin,which will offer reference to the similar research..The main understanding and conclusions are as follows:1.Not sufficient datum and disrelation of criterion of stratigraphic classification was offered in Region of interest because of individual development a few years ago.After various difficulties were overcomed,according to unified criterion,layer of Yanan group and Yanchang group were firstly divided into 11 layers such as Y8,Y9¹,Y9²,Y10¹,Y10²,C1,C2^1-1,C2^1-2,C2^1-3,C2²,C2³,and builded formation detailed framework of whole region;2.Microtectonics of each subzone of Yanan group and Yanchang group were firstly researched systematiely and deeply,different types of microtectonics were formed by affect of differential compaction and tectonic stress,variable regular pattern of plane and section were described finely,meanwhile mechanism of gas-oil inrichment and oil remaining distribution was studied;3.The reservoir characteristic of deposition,petrology,paleontology,logging geology, and the geometry of the sand body were analyzed systematically,of which indicate that Yanan group is river facies deposition,which different from previous deltaic plain,and Yanchang group is deltaic plain;meanwhile,The reservoir depositional microfacies,the rock-electrical characteristic of different sedimentary body are researched.Four electrofacies models were summarized;Y9,C1 and C2 were belonged to type ofⅢand Y10 to type oⅡ;4.The reservoir characteristic of petrology,composition of pore throat,diagenic metamorphism,heterogeneity,oil character,electric nature,relative permeability curve, water displacing oil,wettability were firstly studied synthetically,based on these, distribution characteristic and variable regular pattern of plane and section of the heterogeneity of the layer-in,interformation and horizontal,oil saturation and flow unit and their influential factors were described deeply,generally and finely.The criterion of reservoir delineation was made and types of its were divided by three types and types of each member were classified according to this criterion.5.Based on previous study,reservoir flow units were closely analyzed and include the development and dynamic testing data into the classification criteria and the new method of multiparameter clustering eanalysis was adopted,of which made the criteria more reasonable.Four types of flow units in the study area were identified,furthermore,the relationship among depositional microfacies,oil remaining distribution and flow units are discussed;6.Types of structure trap and drive of were analyzed systematicly,of which indicate that The traps of Yanan group and Yanchang group both are mainly structure-lithology trap and lithologic trap,drive type of Yanan group is mainly edge- bottom drive types and which of Yanchang group is elasticity- dissolved-gas drive;7.Based on the research of the types and characteristic of oil remaining distribution, proposed that the main factor of remaining oil forming include reservoir and development no-balance.Distribution of remaining oil is controlled by depositional microfacies,which is mainly in thin sand of edge river and interchannel in plane and in the upper of direct cyclic deposition in section because of higher water flushed degree.Distribution of remaining oil of C2^1-1and C2^1-2is mainly in thick sand of main stream channel because of late development.更多还原