本文選題：鄂爾多斯盆地　切入點：長1儲層　出處：《西安石油大學》2015年碩士論文　論文類型：學位論文

【摘要】：本文運用油氣沉積學?儲層地質(zhì)學?礦物巖石學及儲層評價等理論和方法技術,對鄂爾多斯盆地河莊開發(fā)區(qū)的地層、構造、沉積、物性特征、巖石學及成巖作用、非均質(zhì)特征以及綜合評價等進行了深入的研究,取得了一些相關成果。河莊開發(fā)區(qū)位于延安市寶塔區(qū)境內(nèi),處于鄂爾多斯盆地伊陜斜坡中段,研究區(qū)主力油層組為長2,共劃分為長21、長22和長23三個油層亞組。本次把目前南泥灣采油廠認識的長2頂部油層劃分到了長1油層組,因此長1和長2合并作為本次研究的主要目的層系,在此基礎上通過建立長1、長2構造框架,認為研究區(qū)構造背景為平緩的西傾單斜,發(fā)育有規(guī)模不等的鼻狀隆起,研究區(qū)目前發(fā)現(xiàn)的長1油藏均位于鼻狀隆起發(fā)育區(qū)。通過對區(qū)域沉積背景,和各種沉積相標志的研究,識別出本區(qū)目的層(延長組長1~長2)主要發(fā)育曲流河和辮狀河等幾種沉積模式。并通過編制砂巖等厚圖和以砂地比圖為背景的沉積相圖對長1油層組和長21、長22、長23亞組砂體平面展布規(guī)律及沉積微相進行了分析。研究區(qū)長2儲層作為主力油層,通過巖心觀察描述、薄片鑒定,巖性以細粒長石砂巖為主,目前該儲層已處于中成巖階段的A期,孔隙類型為粒間溶孔和剩余粒間孔。該區(qū)儲層物性較差,屬于低孔、特低滲儲層。該儲層宏觀非均值性較強;將儲層歸類為:Ⅲb、Ⅳa、Ⅳb和Ⅴ類,其中Ⅲb類、Ⅳa類分別為研究區(qū)長2儲層中的好、較好儲層,Ⅳb類為差儲層,Ⅴ類為致密層。
[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，

本文編號：1590473