【作者】 朱静；

【导师】 李文厚；

【作者基本信息】 西北大学 ， 油气田地质与开发， 2013， 博士

【摘要】 本文以鄂尔多斯盆地三叠系延长组下部层系长10、长9油层组为研究对象,运用沉积学、测井地质学、储层地质学等地质理论,进行了物源分析、沉积微相划分、沉积相分布、砂体展布、储层特征和高渗储层分布规律研究。首次将长10三分和长10.三分绘制了全盆地沉积相和砂体展布图,恢复了盆地长10—长9期古地理演化过程；首次对全盆地长1011储层开展研究,对不同地区长1011-长9储层特征进行分类、总结。从古流向、岩矿、阴极发光、微量元素等的分布特征及砂体的平面展布形态,明确提出盆地长10—长9期物源可划分为东北部、西北部、西南部和南部四个体系。依据露头观察、岩心描述和测井相分析,判定长10、长9主要有湖泊、三角洲、河流和冲积扇四种沉积体系,识别出5种沉积相、13种亚相。明确提出盆地长10期以发育河流—三角洲—滨浅湖相沉积为特色,长9期以发育“多三角洲环湖”的沉积格局为特色。延长组下部长10一长9期共发育11个规模较大的湖泊三角洲砂体,形成了一系列多水系、多物源的河流及环带状三角洲裙体,不同于延长组上部沉积体系,辫状河三角洲砂体较曲流河三角洲砂体更为发育。结合分析化验、试油资料开展长1011、长9储层岩石学、孔隙类型结构、物性特征及成岩作用研究,结果表明：储层砂岩以岩屑长石砂岩和长石砂岩为主,填隙物总含量高(均大于10%),长9绿泥石含量高,长1011浊沸石含量高；粒度分布长9以细—中砂为主、长1011中砂含量高；孔隙类型以粒间孔为主,长石溶孔、浊沸石溶孔次之；孔隙结构长9以小孔微细喉、中孔微细喉型为主,长1011以小孔微细喉、中孔细喉型为主；建设性成岩作用为绿泥石膜胶结作用和溶蚀作用。沉积环境和成岩作用是影响高渗储层分布的主要因素,沉积相是先天基础,成岩作用是后天建设。更多还原

【Abstract】 Based on the theories of sedimentary, logging geology and reservoir geology, sediment source, sedimentary facies and distributions, sand-body distribution, reservoir characteristics and distribution regularity of high-penetration reservoir about the lower of Yanchang formation of Chang9and Chang10oil layer group in Triassic system of Ordos Basin are researched. Chang10oil layer group is firstly divided into three parts, and Chang10|oil layer group is firstly divided into three parts too. Sedimentary facies and sandbodies distribution maps of the each part about the whole basin are protracted. Meanwhile, paleogeographic evolution of Chang9to Chang10of Ordos Basin was reconstructed. Reservoir of Chang1011oil layer group about in the whole Ordos Basin is researched firstly. Reservoir characteristics of Chang9and Chang1011in the indifferent region is classified and summarized firstly.Provenance of Chang9and Chang10which are comes from four systems including northeast, northwest, southwest and south is clearly put forward by study on paleocurrent direction, rock and mineral analysis, distribution of cathodoluminescencede, minor elements and sandbodies. Sedimentary system of Chang9and Chang10can be divided into four kinds of sedimentary systems such as lakes, deltas, rivers and alluvial fans which contain five kinds of sedimentary facies and thirteen kind of sedimentary subfacies by analysis of outcrop observation, core description and log facies. The conclusion that the main characteristics sedimentary facies about Chang10is rivers-deltas-shore shallow lake facie, but the sedimentary facies of Chang9has the features of "many of deltas around lake" has been drawn clearly. There are eleven relatively large scale deltas stone bodies of lake which form a series of water system, multi-source river and zonal pattern deltas in the period of Chang10to Chang9. Sedimentary system of Chang9and Chang10are different from the upper of Yanchang formation for the sand bodies of braided channel delta are more development than meandering river delta.Combining the laboratory data and oil production test data, the petrologic characteristics, pore types and structure, physical property characteristic and diagenesis of Chang9and Chang1011are studied. The results show that the sandstone is mainly composed by lithical arkose and arkose, interstitial material content is high (more than10%), chlorite is higher in the Chang9reservoir and laumontite is higher in Chang1011reservoir. It is mainly consist by fine-medium sand in Chang9reservoir, but medium sand in Chang1011reservoir. Porosity types of Chang9and Chang1011reservoir are mainly composed by predominantly intergranular pore, the secondly is solution pores of feldspar and laumontite. The main pore-throat type of Chang9is small pore and tiny throat, medium pore and tiny throat. The main pore-throat type of Chang1011is small pore and tiny throat, medium pore and fine throat. Constructive diagenesis includes chlorite cementation and solution. High-permeability reservoirs are mainly controlled by sedimentation environment and diagenesis. Sedimentary facies is the innate basis and diagenesis play important roles later.更多还原