本文選題：鄂爾多斯盆地 + 城華地區(qū)　； 參考：《成都理工大學(xué)》2017年碩士論文

【摘要】：本學(xué)位論文以鄂爾多斯盆地城華地區(qū)延長組長3油層組為研究對象,以當(dāng)前沉積學(xué)和石油地質(zhì)學(xué)領(lǐng)域先進(jìn)的理論方法和技術(shù)手段為指導(dǎo),充分利用鉆井巖心觀察資料、薄片鑒定、掃描電鏡等測試分析手段,對該區(qū)沉積相特征、儲(chǔ)層特征及成巖作用進(jìn)行了深入分析。研究分析認(rèn)為研究區(qū)長3沉積物源來自東北和西南的古河流,東北方向的河流三角洲發(fā)育明顯,主要發(fā)育三角洲的前緣沉積。普遍認(rèn)為前緣砂體發(fā)育的有利相帶主要是水下分流河道與河口壩,砂體沉積厚度受沉積相帶的控制,即三角洲前緣的水下分流河道砂體為研究區(qū)主要儲(chǔ)層砂體,呈明顯的疊置分布。鏡下薄片觀察表明,儲(chǔ)層中巖屑長石砂巖和長石巖屑砂巖是最主要的巖石組分,以細(xì)砂巖為主,分選較好,主要的孔隙類型是原生粒間孔,長石溶孔和巖屑溶孔普遍存在。對研究區(qū)的成巖作用進(jìn)行了精細(xì)的研究,長期而穩(wěn)定存在的壓實(shí)(壓溶)作用、膠結(jié)作用,局部地區(qū)存在溶蝕作用和交代作用。在孔隙演化的過程中,壓實(shí)作用和碳酸鹽巖的膠結(jié)作用使孔隙度降低,降低了儲(chǔ)層的儲(chǔ)集能力。盡管溶蝕作用能使砂巖孔隙度有所增大,增強(qiáng)了砂巖的孔滲性,但因?yàn)樘妓猁}發(fā)育有限,所以溶蝕作用不足以增強(qiáng)儲(chǔ)集能力。研究區(qū)成巖階段的劃分表明該區(qū)整體上處于中成巖階段A-B期�？诐B數(shù)據(jù)分析表明,研究區(qū)儲(chǔ)層主要是低孔低滲儲(chǔ)層�？紫抖冉橛�10%~12%之間,滲透率介于0.1×10-3μm2~0.5×10-3μm2之間,孔連通性中等。壓汞實(shí)驗(yàn)曲線表明,長3的壓汞特征為高斜率,近似平臺(tái)型,作為低孔低滲儲(chǔ)層,前景比較好。在上述研究基礎(chǔ)上,對儲(chǔ)層進(jìn)行了綜合評價(jià)。長33主要發(fā)育Ⅰ、Ⅱ類儲(chǔ)層儲(chǔ)層,長32、長31主要發(fā)育Ⅱ類和Ⅲ類儲(chǔ)層,說明長33儲(chǔ)層品質(zhì)整體高于長32、長31。為該區(qū)下一步油氣勘探開發(fā)的提供了有利目標(biāo)。
[Abstract]:This dissertation takes Yanchang formation No. 3 in Chenghua area, Ordos Basin, as the research object, and takes the advanced theoretical methods and technical means in the field of sedimentology and petroleum geology as the guidance to make full use of drilling core observation data. The characteristics of sedimentary facies, reservoir and diagenesis in this area are analyzed by means of thin slice identification and scanning electron microscope. It is considered that the source of Chang 3 sediment in the study area is from the ancient rivers in the northeast and southwest, and the river delta in the northeast direction is obviously developed, and the delta front sediments are mainly developed. It is generally considered that the favorable facies zones for the development of the front sand bodies are mainly underwater distributary channels and estuarine dams, and the thickness of the sand bodies is controlled by the sedimentary facies belts, that is, the underwater distributary channel sandbodies in the delta front are the main reservoir sandbodies in the study area. There is obvious overlay distribution. The microscopic observation shows that lithic feldspathic sandstone and feldspar lithic sandstone are the most important rock components in the reservoir, with fine sandstone as the main component and good separation. The main pore types are primary intergranular pores, feldspar dissolution pores and lithic dissolution pores are common. The diagenesis in the study area is studied in detail. The long-term and stable compaction (pressure solution), cementation, and local dissolution and metasomatism are studied. In the process of pore evolution, compaction and cementation of carbonate rock decrease porosity and decrease reservoir capacity. Although the dissolution can increase the porosity of sandstone and enhance the porosity and permeability of sandstone the dissolution is not sufficient to enhance the reservoir capacity because of the limited development of carbonate. The division of diagenetic stage in the study area indicates that the area is in the A-B stage of the middle diagenetic stage. The analysis of pore and permeability data shows that the reservoir in the study area is mainly low porosity and low permeability. The porosity is between 10% and 12%, the permeability is between 0.1 脳 10-3 渭 m ~ (-2) and 0.5 脳 10 ~ (-3) 渭 m ~ (2), and the porosity is moderate. The experimental curves of mercury injection show that the mercury injection of Chang 3 is characterized by high slope and is similar to platform type. As a low porosity and low permeability reservoir, it has a good prospect. On the basis of the above research, a comprehensive evaluation of the reservoir is carried out. Chang33 mainly developed 鈪，

本文編號(hào)：2046530