發(fā)布時間：2018-05-09 14:02

  本文選題：直羅油田 + 延長組　； 參考：《西安石油大學(xué)》2017年碩士論文

【摘要】：直羅油田直羅探區(qū)位于陜西省富縣境內(nèi),研究區(qū)面積1168.7km~2,構(gòu)造位置屬于鄂爾多斯盆地陜北斜坡東南部。目前該區(qū)已開發(fā)的長2開發(fā)區(qū)塊,勘探開發(fā)程度不均勻,且已進(jìn)入高含水時期,生產(chǎn)矛盾日益突出,自然遞減達(dá)20%以上。為了保證該區(qū)油田的穩(wěn)產(chǎn)增產(chǎn),找出已開發(fā)區(qū)塊外的長2層有利區(qū),迫在眉睫。本文運用沉積學(xué)、層序地層學(xué)、石油地質(zhì)學(xué)、儲層地質(zhì)學(xué)、地球物理學(xué),地球化學(xué)等理論對該區(qū)進(jìn)行整體地質(zhì)認(rèn)識,在區(qū)域認(rèn)識的基礎(chǔ)上,從沉積相和砂體展布研究入手,著重分析主力目的層的構(gòu)造、儲層特征及油氣成藏控制因素,生儲蓋的配置關(guān)系,從而弄清研究區(qū)油氣富集地質(zhì)條件,預(yù)測有利油藏分布區(qū),為油田勘探開發(fā)提供目標(biāo)。研究區(qū)長2地層構(gòu)造平緩,在西傾單斜背景下發(fā)育的近東西向低緩鼻狀隆起;長2沉積期,研究區(qū)主要發(fā)育三角洲前緣亞相;由巖心觀察、鑄體薄片、掃描電鏡分析,儲層的巖石類型主要為細(xì)粒巖屑長石砂巖和長石砂巖,分選較好,次棱角狀磨圓,孔隙類型以殘余粒間孔為主,儲層物性較差,屬于低、特低孔-超低滲儲層;鑄體薄片、掃描電鏡、X衍射等微觀實驗結(jié)果表明,研究區(qū)長2儲層成巖作用類型主要為機(jī)械壓實作用、膠結(jié)作用、交代作用和溶蝕作用,且儲層砂巖已進(jìn)入中成巖階段A期。三角洲前緣水下分流河道砂體是主要的儲集砂巖,在沉積作用的基礎(chǔ)上,各種成巖作用對儲層砂巖的物性起著建設(shè)或破壞性的影響,使儲層性能復(fù)雜化。結(jié)合各類測試資料及研究分析,得出烴源巖分布、沉積作用、儲層物性、構(gòu)造作用、是控制含油性的主要因素,綜合該區(qū)含油性控制因素和試油資料,對主力層長2~1、長2~2進(jìn)行了有利區(qū)篩選,預(yù)測Ⅱ類勘探目標(biāo)有利區(qū)3個,Ⅲ類勘探目標(biāo)有利區(qū)4個,為研究區(qū)后續(xù)勘探開發(fā)工作提供了可靠的地質(zhì)依據(jù)。
[Abstract]:The Zhiluo exploration area of Zhiluo Oilfield is located in the rich county of Shaanxi Province with an area of 1168.7 km2 and the structural position belongs to the southeastern slope of northern Shaanxi in the Ordos Basin. At present, the exploration and development degree of Chang2 development block in this area is not even, and it has entered into high water cut period, the production contradiction is more and more prominent, the natural decline is more than 20%. In order to ensure stable production and increase production in this area, it is urgent to find the favorable area of 2 layers outside the developed block. Based on the theories of sedimentology, sequence stratigraphy, petroleum geology, reservoir geology, geophysics, geochemistry, and so on, this paper studies the distribution of sedimentary facies and sand bodies on the basis of regional understanding. The structure of the main target layer, reservoir characteristics, controlling factors of oil and gas accumulation, and the distribution of source, reservoir and cap are analyzed in order to make clear the geological conditions of oil and gas enrichment in the study area, to predict the favorable reservoir distribution area, and to provide the target for oil field exploration and development. The Chang-2 stratigraphic structure in the study area is flat, the near east-west low slow nose uplift developed in the background of the westward inclination monoclinal, the delta front subfacies mainly developed in the Chang 2 sedimentary period, the core observation, the casting thin section, the scanning electron microscope analysis, The rock types of reservoir are mainly fine lithic feldspathic sandstone and feldspar sandstone with good sorting, sub-angle-shaped grinding circle, pore type of residual intergranular pore, poor physical property of reservoir, ultra-low porosity and ultra-low permeability reservoir; The results of SEM and XRD show that the diagenesis types of Chang 2 reservoir are mainly mechanical compaction, cementation, metasomatism and dissolution, and the sandstone has entered stage A of middle diagenesis. The delta front underwater distributary channel sand body is the main reservoir sandstone. On the basis of sedimentary process, various diagenesis has a construction or destructive effect on the physical properties of reservoir sandstone, which complicates the reservoir performance. Combined with all kinds of test data and research and analysis, it is concluded that hydrocarbon source rock distribution, sedimentation, reservoir physical property and tectonism are the main factors controlling oil bearing, and synthesizing the oil-bearing control factors and oil testing data in this area. In this paper, the favorable zones of the main formation are screened, and three favorable areas for class 鈪，

本文編號：1866300