本文關(guān)鍵詞： 鎮(zhèn)北油田 儲(chǔ)層特征 成巖作用 膠結(jié)作用 主控因素　出處：《西安石油大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：鄂爾多斯盆地鎮(zhèn)北油田長(zhǎng)3油層組油氣豐富,建產(chǎn)區(qū)塊較多,但砂體變化快,建產(chǎn)區(qū)塊小,儲(chǔ)層展布不夠清晰,且儲(chǔ)層儲(chǔ)集性能的主控因素等方面的研究相對(duì)薄弱。因此,有必要開展長(zhǎng)3儲(chǔ)層特征及主控因素研究,為下一步勘探開發(fā)提供地質(zhì)依據(jù)。本文以沉積學(xué)、儲(chǔ)層沉積學(xué)及石油地質(zhì)理論為指導(dǎo),利用巖心觀察、鑄體薄片鑒定、X-衍射分析、掃描電鏡、壓汞測(cè)試等多種測(cè)試分析手段,對(duì)鎮(zhèn)北地區(qū)長(zhǎng)3油層組的儲(chǔ)層巖石學(xué)特征、微觀孔隙結(jié)構(gòu)特征、成巖作用、物性特征等方面進(jìn)行了綜合研究,并得到以下結(jié)論。本區(qū)長(zhǎng)3儲(chǔ)層的結(jié)構(gòu)成熟度中等,以灰色或淺灰色中細(xì)粒巖屑長(zhǎng)石砂巖為主,填隙物分布不均,以硅質(zhì)含量為主,其次為水云母。長(zhǎng)3主要孔隙類型主要為剩余粒間孔,其次為長(zhǎng)石溶孔。儲(chǔ)層經(jīng)歷的成巖作用類型主要有:壓實(shí)作用、膠結(jié)作用和溶解作用。膠結(jié)作用中主要為硅質(zhì)膠結(jié),其次水云母膠結(jié)。溶蝕作用是形成次生孔隙的主要作用。成巖相劃分為I類中粗砂巖弱壓實(shí)相、II類高嶺石膠結(jié)溶蝕孔相、III類中細(xì)砂巖殘余粒間孔相和Ⅳ類致密膠結(jié)相四類成巖相。成巖演化階段主要處于晚成巖階段的A期。本區(qū)物性特征研究表明:其中長(zhǎng)31、長(zhǎng)32和長(zhǎng)33儲(chǔ)層的平均滲透率分別為3.05×10~(-3)μm~2、3.21×10~(-3)μm~2、3.15×10~(-3)μm~2,儲(chǔ)層的平均孔隙度分別為12.95%、12.84%、12.42%。滲透率主要是由于各小層之間的孔隙結(jié)構(gòu)不同,長(zhǎng)32的喉道半徑最大。長(zhǎng)3儲(chǔ)層屬于中低孔—超低滲類儲(chǔ)層。從整體上來講,本區(qū)長(zhǎng)3儲(chǔ)層主要受沉積相的控制,其次是成巖相。沉積相從宏觀上控制著儲(chǔ)層物性的分布,而且三角洲平原的物性好于三角洲前緣,整體上表現(xiàn)為分支河道和水下分流河道物性較好;分流河道中主要發(fā)育中粗砂巖弱壓實(shí)相(水云母4,碳酸鹽4,沉積相帶粗)且物性最好,分布在Z291—Z299—Z448—Z231的西部。其次是水下分流河道中發(fā)育高嶺石膠結(jié)溶蝕孔相(溶蝕孔相對(duì)含量40%)的儲(chǔ)層物性,主要分布在桐川附近。
[Abstract]:Chang 3 reservoir formation of Zhenbei Oilfield in Ordos Basin is rich in oil and gas, and there are many blocks in the built-up area, but the sand body changes rapidly, the block is small, and the reservoir distribution is not clear enough. Therefore, it is necessary to study the characteristics and main control factors of Chang 3 reservoir to provide geological basis for further exploration and development. Under the guidance of reservoir sedimentology and petroleum geology theory, using core observation, casting thin section identification, X-ray diffraction analysis, scanning electron microscope, mercury injection test and other means of testing and analysis. The petrological characteristics, microscopic pore structure, diagenesis and physical properties of Chang 3 formation in Zhenbei area were studied. The results are as follows: the structure maturity of Chang3 reservoir in this area is moderate, mainly of gray or light gray medium fine grained lithic feldspathic sandstone, uneven distribution of interstitial material, and mainly siliceous content. The main pore types of Chang 3 are residual intergranular pores, followed by feldspar dissolution pores. The diagenesis types of reservoirs are mainly compaction. Cementation and dissolution. The cementation is mainly siliceous cementation, followed by hydromica cementation. Dissolution is the main role of forming secondary pores. Diagenetic facies can be divided into class I medium coarse sandstone weak compaction facies. Type II kaolinite cementation solution pore facies. There are four types of diagenetic facies: residual intergranular pore facies of III type and dense cementation facies of type 鈪，

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