延长油田河庄区长2储层特征研究

发布时间：2018-03-09 22:09

  本文选题：鄂尔多斯盆地　切入点：长1储层　出处：《西安石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文运用油气沉积学?储层地质学?矿物岩石学及储层评价等理论和方法技术,对鄂尔多斯盆地河庄开发区的地层、构造、沉积、物性特征、岩石学及成岩作用、非均质特征以及综合评价等进行了深入的研究,取得了一些相关成果。河庄开发区位于延安市宝塔区境内,处于鄂尔多斯盆地伊陕斜坡中段,研究区主力油层组为长2,共划分为长21、长22和长23三个油层亚组。本次把目前南泥湾采油厂认识的长2顶部油层划分到了长1油层组,因此长1和长2合并作为本次研究的主要目的层系,在此基础上通过建立长1、长2构造框架,认为研究区构造背景为平缓的西倾单斜,发育有规模不等的鼻状隆起,研究区目前发现的长1油藏均位于鼻状隆起发育区。通过对区域沉积背景,和各种沉积相标志的研究,识别出本区目的层(延长组长1~长2)主要发育曲流河和辫状河等几种沉积模式。并通过编制砂岩等厚图和以砂地比图为背景的沉积相图对长1油层组和长21、长22、长23亚组砂体平面展布规律及沉积微相进行了分析。研究区长2储层作为主力油层,通过岩心观察描述、薄片鉴定,岩性以细粒长石砂岩为主,目前该储层已处于中成岩阶段的A期,孔隙类型为粒间溶孔和剩余粒间孔。该区储层物性较差,属于低孔、特低渗储层。该储层宏观非均值性较强;将储层归类为:Ⅲb、Ⅳa、Ⅳb和Ⅴ类,其中Ⅲb类、Ⅳa类分别为研究区长2储层中的好、较好储层,Ⅳb类为差储层,Ⅴ类为致密层。
[Abstract]:Oil and gas sedimentology is used in this paper. Reservoir geology? The theories and methods of mineral petrology and reservoir evaluation are used to study the stratigraphy, structure, sedimentation, physical properties, petrology and diagenesis, heterogeneity and comprehensive evaluation of the Hezhuang Development Zone, Ordos Basin. It is located in Baota District, Yan'an City, in the middle of the Yishan slope of the Ordos Basin. The main reservoir formation in the study area is Chang2, which is divided into three subgroups: Chang21, Chang22 and Chang23. This time, the top layer of Chang2 recognized by Nanniwan Oil production Plant has been divided into Chang1 formation. Therefore, the combination of Chang 1 and Chang 2 is the main target series of this study. On this basis, by establishing the Chang 1 and Chang 2 structural frameworks, it is considered that the tectonic setting of the study area is a gentle western-dip monocline with various scales of nasal uplift. The Chang 1 reservoirs found at present in the study area are located in the nasal uplift development area. Through the study of the regional sedimentary background and various sedimentary facies markers, Several sedimentary models, such as meandering river and braided river, are mainly developed in the target layer (Yanchang 1 ~ Chang2) in this area. By compiling the sandstone isothickness map and sedimentary facies diagram with sand / land ratio map as the background, Chang 1 reservoir formation and Chang 21, Chang 22, and so on, are studied. The horizontal distribution of sand bodies and sedimentary microfacies of Chang 23 subgroup are analyzed. Chang2 reservoir is the main reservoir in the study area. The lithology of the reservoir is mainly fine feldspathic sandstone through core observation and description. At present, the reservoir is in stage A of the middle diagenetic stage. The pore types are intergranular dissolved pore and residual intergranular pore. The reservoir physical properties in this area are poor and belong to low porosity. The reservoir is classified as: 鈪，

本文编号：1590473