准噶尔盆地东部阜北地区侏罗系三工河组储层特征及主控因素分析

发布时间：2018-10-18 20:17

【摘要】：本文以准噶尔盆地东部阜北地区下侏罗统三工河组砂岩储层作为研究目标,结合前人研究成果,通过野外剖面测量、岩心观察描述为基础,结合铸体薄片、X衍射、扫描电镜、物性、核磁共振、恒速压汞等储层微观实验分析,深入研究储层微观岩矿组构及微观孔隙结构特征,研究成岩作用方式和成岩序列,明确优质储层主控因素,综合研究得出如下结论:(1)研究区下侏罗统三工河组储集砂岩类型以长石砂岩为主、其次为岩屑砂岩,中-粗粒长石砂岩、岩屑砂岩物性更好;储集空间主要为残余粒间孔为主,其次为粒间溶孔和粒内溶孔,微观孔喉结构属于小孔细喉-微喉;储层物性整体中等偏差,其中三工河组一段物性和孔隙结构相比三二段和三三段更好。(2)三工河组属于辫状河三角洲前缘亚相沉积,三角洲前缘水下分流河道微相水动力最强,储层泥质杂基含量最低,易形成“干净”的砂体,为形成优质储层奠定了基础。(3)压实作用是储层物性最主要的破坏性成岩作用,造成了储层物性不可逆的降低,中成岩阶段的叶片状绿泥石、方解石、石英、高岭石等胶结物堵塞孔喉,可导致储层物性变差。(4)早成岩阶段环边状绿泥石胶结和地层超压均有利于原生粒间孔的保存,中成岩阶段溶蚀作用形成有利储层发育的次生溶孔带,进一步改善了储层物性。上述研究成果将为丰富准噶尔盆地阜康东环带三工河组地质认识和下步油气勘探提供重要依据。
[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.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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