三塘湖盆地牛圈湖地区西山窑组不同成岩相孔喉特征及生产动态分析

发布时间：2018-05-29 12:53

  本文选题：三塘湖盆地 + 西山窑组　； 参考：《西北大学》2017年硕士论文

【摘要】：三塘湖盆地牛圈湖地区西山窑组储层微观孔隙结构复杂,非均质性强,本文利用铸体薄片、扫描电镜、X衍射、高压压汞实验、恒速压汞实验、核磁共振实验等多种测试手段,从成岩相角度出发,分析不同成岩相储层的岩石学特征、微观孔隙结构、可动流体赋存特征及生产动态特征。取得以下主要认识:(1)研究区X2段岩性主要为细-中粒长石岩屑砂岩,储层物性整体较差,孔隙度平均为12.4%,渗透率平均为3.24×10-3μm2,整体而言,油层在成分、结构成熟度、填隙物含量以及物性方面都最好,其次为差油层,油干层最差。(2)研究区X2段成岩作用类型多样,成岩阶段为中成岩A期。依据胶结类型、孔隙类型以及面孔率,研究区西山窑组可划分为6个成岩相类型,优势成岩相主要为:高岭石+伊利石胶结一粒间孔+长石溶孔相、高岭石+绿泥石胶结一粒间孔+凝灰质溶孔相、高岭石+伊利石胶结一粒间孔+凝灰质溶孔相。(3)不同成岩相储层微观孔隙结构存在明显差异,特别体现在喉道上:高岭石+伊利石胶结一粒间孔+长石溶孔相主流喉道半径最大(平均为6.68μm),配位数最高;高岭石+碳酸盐岩胶结一长石溶孔+凝灰质溶孔相主流喉道半径最小(平均为0.63μm)且配位数最低。(4)不同成岩相储层可动流体饱和度不同,核磁共振实验结果表明:高岭石+伊利石胶结一粒间孔+长石溶孔相孔喉连通性好,可动流体饱和度最高(平均50.96%);高岭石+碳酸盐岩胶结—长石溶孔+凝灰质溶孔相孔喉连通性差,可动流体饱和度最低(平均36.83%)。(5)物性是影响不同成岩相可动流体饱和度的重要因素之一,其中渗透率与可动流体饱和度相关性(R2为0.5314)相比孔隙度(R2为0.4043)较大。微观孔喉结构是储层物性的重要控制因素,而主流喉道半径、有效孔喉体积和孔喉半径比的差异是导致微观孔隙结构内部差异的决定性因素。(6)不同成岩相储层生产动态特征存在差异。其中高岭石+绿泥石胶结—粒间孔+凝灰质溶孔相日产油和日产液最高,含水率上升较快,稳产周期较长,其次为高岭石+伊利石胶结—粒间孔+长石溶孔相,高岭石+伊利石胶结—粒间孔+凝灰质溶孔相最差。
[Abstract]:The microcosmic pore structure of Xishanyao formation reservoir in Niuquanhu area of Santanghu Basin is complex and heterogeneous. In this paper, various testing methods, such as casting thin slice, scanning electron microscope X diffraction, high pressure mercury injection experiment, constant speed mercury pressure experiment, nuclear magnetic resonance test, etc, are used. From the diagenetic facies point of view, the petrological characteristics, micro-pore structure, movable fluid occurrence and production dynamic characteristics of different diagenetic facies reservoirs are analyzed. The main understanding is as follows: (1) the lithology of X2 member in the study area is mainly fine to medium grained feldspathic sandstone, the overall physical property of the reservoir is poor, the average porosity is 12.4 and the average permeability is 3.24 脳 10 ~ (-3) 渭 m ~ (2). On the whole, the reservoir is in composition and structural maturity. The content of interstitial matter and physical properties are the best, followed by the poor reservoir and the worst reservoir. The diagenesis types of X2 member in the study area are various, and the diagenetic stage is middle diagenetic stage A. According to the cementation type, pore type and porosity, the Xishanyao formation in the study area can be divided into 6 diagenetic facies. The dominant diagenetic facies are kaolinite Illite cementation and intergranular feldspar dissolution pore facies. Kaolinite chlorite cementation one intergranular pore tuff dissolved pore facies, kaolinite Illite cementation and intergranular pore tuff dissolution pore facies. 3) the micropore structure of different diagenetic facies reservoirs is obviously different from that of kaolinite chlorite cementation and kaolinite Illite cementation. Especially in the throat: kaolinite Illite cemented the intergranular feldspar dissolution pore in the mainstream throat radius is the largest (mean 6.68 渭 m ~ (-1), coordination number is the highest; Kaolinite carbonate rock cementation-feldspar dissolved pore tuff has the smallest main throat radius (average 0.63 渭 m) and the lowest coordination number. The results of nuclear magnetic resonance (NMR) showed that kaolinite and Illite cemented one intergranular feldspar with good pore throat connectivity. The saturation of movable fluid is the highest (mean 50.96), the connectivity of pore throat of kaolinite carbonate rock cementation and feldspar dissolved pore tuff is poor, The lowest movable fluid saturation (average 36.83%) is one of the important factors affecting the movable fluid saturation of different diagenetic facies, and the correlation between permeability and movable fluid saturation is 0.5314, which is larger than that of porosity (R ~ 2 = 0.4043). Microcosmic pore throat structure is an important controlling factor of reservoir physical properties, and the mainstream throat radius, The difference of effective pore throat volume and pore throat radius ratio is the decisive factor leading to the internal difference of microscopic pore structure. Among them, kaolinite chlorite cemented with intergranular pore tuffaceous dissolved pore phase produces the highest daily oil and liquid, the water content rises rapidly, and the stable production period is longer, followed by kaolinite Illite cementation and intergranular pore feldspar dissolution pore phase. Kaolinite Illite cemented-intergranular pore tuff dissolved pore phase is the worst.
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE311
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本文编号：1950949