發(fā)布時間：2018-02-12 02:08

  本文關(guān)鍵詞： 沉積相特征 儲層綜合評價 長8油層組 馬嶺地區(qū) 鄂爾多斯盆地　出處：《成都理工大學》2015年碩士論文　論文類型：學位論文

【摘要】：馬嶺地區(qū)是長慶油田近年來于鄂爾多斯盆地西南部中生界發(fā)現(xiàn)的一個油田,區(qū)域上位于鄂爾多斯盆地伊陜斜坡的西南部,三疊系延長組長8油層組作為主力產(chǎn)層。本文以眾多前人研究成果為基礎(chǔ),通過現(xiàn)場調(diào)查、巖芯觀察和測井資料、測試分析資料相結(jié)合,宏觀分析與微觀研究相結(jié)合,理論應(yīng)用于生產(chǎn)實際相結(jié)合,在對馬嶺地區(qū)長8段油層組地層、沉積相及砂體展布研究的基礎(chǔ)上,對儲層特征等進行重點的研究,探討儲層發(fā)育主控因素以及對研究區(qū)建立儲層綜合評價。通過上述研究過程,本文在以下方面取的了一些研究成果和認識:在長慶油田延長組長8油層組地層劃分方案基礎(chǔ)上,綜合分析研究區(qū)典型鉆井長8油層組不同層段沉積相、微相特征,并進行井間沉積相對比研究。認為長8油層組沉積時,研究區(qū)主要受控于西部物源;通過三角洲發(fā)育背景及相標志分析,認為研究區(qū)主要發(fā)育淺水三角洲沉積體系。通過對研究區(qū)的儲集砂體展布特征及成因類型分析,認為儲集砂體橫向擺動大、平面上呈條帶狀、網(wǎng)狀沿南西~北東向、近西~東向展布,連片性較好。其中,水下分流河道砂體及河口壩砂體是油氣賦存的最有利儲集砂體類型。結(jié)合薄片、巖心等分析化驗資料表明,馬嶺地區(qū)長8儲層巖性特征表現(xiàn)為以巖屑長石砂巖、長石巖屑砂巖為主,巖屑、長石含量較高,成分成熟度、結(jié)構(gòu)成熟度均較低;成巖作用主要包括壓實作用、膠結(jié)作用和溶蝕作用;從巖心物性分析統(tǒng)計結(jié)果得知,研究區(qū)大面積低滲背景上,發(fā)育了高滲高產(chǎn)區(qū)(甜點)。長8儲層總體表現(xiàn)為相對低孔低滲,在整體低滲的背景下,局部存在相對高滲區(qū)。研究區(qū)長8儲層發(fā)育的控制因素主要為三個方面:沉積相帶、巖性特征、成巖作用。其中沉積相帶的影響體現(xiàn)在長8砂體隨湖岸線遷移幅度較大,不同其次砂體變化迅速,導(dǎo)致形成淺水三角洲坨狀砂體局部較厚,儲層物性變化較快的特征。根據(jù)石油行業(yè)延長組儲層評價標準,結(jié)合前面對沉積相和砂體以及儲層的巖石學特征、孔隙類型、孔隙結(jié)構(gòu)、物性特征研究等,建立本區(qū)的儲層分類評價標準,并對儲層進行了分類評價,以Ⅰ、Ⅱ類儲層為主。
[Abstract]:The Maling area is an oil field discovered in the Mesozoic in the southwest of Ordos Basin in recent years in Changqing Oilfield. It is located in the southwest of the Yishan slope in the Ordos Basin. Yanchang formation 8 of the Triassic Yanchang formation is the main reservoir. Based on many previous research results, this paper combines the field investigation, core observation and logging data, test and analysis data, macro analysis and micro research. On the basis of the study of formation, sedimentary facies and sand body distribution of Chang 8 formation in Maling area, the reservoir characteristics are mainly studied. The main controlling factors of reservoir development and the establishment of comprehensive evaluation of reservoir in the study area are discussed. Through the above research process, some research results and understandings are obtained in the following aspects: on the basis of the stratigraphic division scheme of Chang 8 formation in Changqing Oilfield, Yanchang formation, Changqing Oilfield. The sedimentary facies and microfacies of different formations of typical Chang 8 oil formation in the study area are comprehensively analyzed, and the cross-well sedimentary facies are compared. It is considered that the study area is mainly controlled by the western provenance when the Chang 8 oil formation is deposited. Based on the analysis of the development background and facies marker of the delta, it is considered that the shallow water delta sedimentary system is mainly developed in the study area. By analyzing the distribution characteristics and genetic types of the reservoir sand bodies, it is concluded that the lateral swinging of the reservoir sand bodies is large. On the plane, it is striped, the mesh is distributed in the direction of NW to NE, the near west to east, and the continuity is good. Among them, the underwater distributary channel sand body and the estuarine bar sand body are the most favorable reservoir sand bodies for oil and gas accumulation. The core analysis data show that the lithologic characteristics of Chang 8 reservoir in Maling area are characterized by lithic feldspar sandstone, feldspathic sandstone, high lithic and feldspar content, low compositional maturity and low structural maturity. Diagenesis mainly includes compaction, cementation and dissolution. Under the background of overall low permeability, there is a relatively high permeability area. The main factors controlling the development of Chang 8 reservoir in the study area are three aspects: sedimentary facies zone, lithologic characteristics, Diagenesis. The influence of sedimentary facies zone is reflected in the large migration range of Chang 8 sand body with the lacustrine line, and the rapid change of different secondary sand bodies, which results in the formation of shallow water deltaic lump sand bodies with thicker parts. According to the reservoir evaluation criteria of Yanchang formation in petroleum industry, combined with previous studies on petrological characteristics, pore types, pore structure, physical properties of sedimentary facies, sand bodies and reservoirs, The criteria of reservoir classification and evaluation in this area are established, and the classification and evaluation of reservoirs are carried out, mainly in class 鈪，

本文編號：1504542