【摘要】：本文以準噶爾盆地東部阜北地區(qū)下侏羅統(tǒng)三工河組砂巖儲層作為研究目標,結合前人研究成果,通過野外剖面測量、巖心觀察描述為基礎,結合鑄體薄片、X衍射、掃描電鏡、物性、核磁共振、恒速壓汞等儲層微觀實驗分析,深入研究儲層微觀巖礦組構及微觀孔隙結構特征,研究成巖作用方式和成巖序列,明確優(yōu)質儲層主控因素,綜合研究得出如下結論:(1)研究區(qū)下侏羅統(tǒng)三工河組儲集砂巖類型以長石砂巖為主、其次為巖屑砂巖,中-粗粒長石砂巖、巖屑砂巖物性更好;儲集空間主要為殘余粒間孔為主,其次為粒間溶孔和粒內(nèi)溶孔,微觀孔喉結構屬于小孔細喉-微喉;儲層物性整體中等偏差,其中三工河組一段物性和孔隙結構相比三二段和三三段更好。(2)三工河組屬于辮狀河三角洲前緣亞相沉積,三角洲前緣水下分流河道微相水動力最強,儲層泥質雜基含量最低,易形成“干凈”的砂體,為形成優(yōu)質儲層奠定了基礎。(3)壓實作用是儲層物性最主要的破壞性成巖作用,造成了儲層物性不可逆的降低,中成巖階段的葉片狀綠泥石、方解石、石英、高嶺石等膠結物堵塞孔喉,可導致儲層物性變差。(4)早成巖階段環(huán)邊狀綠泥石膠結和地層超壓均有利于原生粒間孔的保存,中成巖階段溶蝕作用形成有利儲層發(fā)育的次生溶孔帶,進一步改善了儲層物性。上述研究成果將為豐富準噶爾盆地阜康東環(huán)帶三工河組地質認識和下步油氣勘探提供重要依據(jù)。
[Abstract]:In this paper, the sandstone reservoir of the Lower Jurassic Sangonghe formation in the Fubei area of eastern Junggar Basin is taken as the research goal, combined with the previous research results, the field profile survey, the core observation description as the foundation, the casting thin section, the X ray diffraction, the scanning electron microscope, Physical properties, nuclear magnetic resonance (NMR), constant velocity mercury pressure and other microscopic experimental analysis of reservoirs, in-depth study of reservoir microscopic rock and ore fabric and microscopic pore structure characteristics, diagenesis and diagenesis patterns and diagenesis sequence, determine the main control factors of high-quality reservoir, The conclusions are as follows: (1) the reservoir sandstone types of Lower Jurassic Sangonghe formation in the study area are mainly feldspathic sandstone, followed by lithic sandstone, medium-coarse feldspathic sandstone, and lithic sandstone with better physical properties, and the reservoir space is mainly composed of residual intergranular pores. Secondly, intergranular dissolved pore and intragranular dissolved pore, micropore throat structure belong to micropore, fine throat and microlarynx, the overall physical property of reservoir is moderate deviation, The physical properties and pore structure of the first member of the Sangonghe formation are better than those of the second and third member. (2) the Sangonghe formation belongs to the braided river delta front subfacies, the delta front underwater distributary channel has the strongest hydrodynamic force, and the reservoir muddy heterogeneity is the lowest. It is easy to form "clean" sand bodies, which lays the foundation for the formation of high-quality reservoirs. (3) compaction is the most important destructive diagenesis of reservoir physical properties, which results in the irreversible reduction of reservoir physical properties, and the vane-like chlorite and calcite in the middle diagenetic stage. Quartz, kaolinite and other cementing materials can block the pore throat, which can lead to the deterioration of reservoir physical properties. (4) the annular chlorite cementation and formation overpressure in early diagenetic stage are beneficial to the preservation of primary intergranular pore. In the middle diagenesis stage, the dissolution formed a favorable secondary solution pore zone, which further improved the reservoir physical properties. The above research results will provide an important basis for rich geological understanding and next step oil and gas exploration of the Sangonghe formation in the eastern ring belt of Fukang in Junggar Basin.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P618.13

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