【作者】 王玉环；

【导师】 冯乔；

【作者基本信息】 西北大学 ， 矿物学、岩石学、矿床学， 2006， 硕士

【摘要】 本文以“鄂尔多斯盆地西部前陆地区古生界储层评价研究”项目为依托,以沉积学理论、陆相储集层研究以及国际油气田勘探的新成果和新认识为指导思想,以区域地质、分析化验、岩芯观察、测井资料等资料为基础,“整体、动态、综合”地研究鄂尔多斯盆地上古生界沉积—储层特征。 通过对鄂尔多斯盆地西缘前陆地区上古生界碎屑岩储层构造特征、沉积微相、储层特征、成岩作用等方面的综合研究认为,研究区受多物源控制,物源方向主要来自北部,北部物源影响至惠安堡—定边以及韦州以南地区;西南部祁连—北秦岭源区为石板沟—平凉等地区提供物源;北秦岭为盆地南部提供物源。并首次提出了南北物源存在差异,由此控制了砂体的展布。目的储集层山西组是一套以曲流河、河控三角洲和湖泊为主的沉积体系。下石盒子组是一套以曲流河、辫状河、辫状河三角洲和湖泊为主的沉积体系。根据大量的岩芯观察描述、化验分析认为该储集砂岩为成分成熟度高和结构成熟度较低的砂岩类型,孔隙类型主要以粒间孔、溶蚀粒间孔为主,属于低孔低渗储层。区内主要的成岩作用有压实压溶作用、胶结作用、溶蚀蚀变作用、粘土矿物转化等作用。明确提出了沉积作用是影响储层物性好坏的基础,压实压溶作用、胶结作用、溶蚀作用是控制区内砂岩储层原生孔隙保存和次生孔隙发育的主要因素。 经过综合分析和评价,区内主要发育三类储层,其中Ⅰ类为有利储层,Ⅱ类、Ⅲ类为较有利储层,Ⅳ类为较差储层。更多还原

【Abstract】 This thesis is relied on the subject "Research of Reservoir characteristics On the Paleozoic of Western foreland Area in Ordos Basin" and it’s guiding ideology is the sedimentology theory, the study of non-marine reservoir, the new achievements and the new understandings of the international exploration of oil and gas fields, and based on areal geology, rock-core, well logging data, experimental data etc. and studies the Sedimentary & Reservoir characteristics On the upper Paleozoic of Western foreland Area in Ordos Basin with "Integrated, Dynamic, Comprehensive".On the base of the studied results of structural feature 、 sedimentary microfacies、 Reservoir Characteristics 、 diagenesis. It’s suggested that several provenances controlled the region of interest, the provenance come from Yinshan paleo-land in the north, Alashan paleo-land in the north-west, Liupanshan Paleo-land in south-west, And Qinlian-Qinling paleo-land in the south. All these point out that the different proposes is one of the control factors to the sand distribution. The major depositional systems of Shanxi formation include meandering stream、 river dominated delta and lacus, and Xiashihezi formation include meandering stream braided stream、 braided delta and lacus. After a large number of core description, observing, and experimental data, it indicated that the high mineral and low textural maturity for the reservoir sand-bodies near the source area. The main diagenesis in the studied area included the compaction & pressolution、 cementation、 infilling 、 dissolution and clay mineral transform, it brings forward that the sedimentation is the important factor of influencing reservoir property, meanwhile, they are the key factors to control the preservation of original pores and the development of secondary pores in sandstone reservoir.There are three types of reservoir formation in this area and the types of I is the favorable ones by the comprehensive research and evaluation. II and III are the better, and the IV is the objectionable .更多还原