大安油田扶余油层沉积特征研究

发布时间：2018-08-14 14:20

【摘要】：大安油田区域构造位置位于松辽盆地南部中央坳陷区大安红岗阶地的二级构造带中,研究区主要发育河控三角洲沉积体系,储层类型属于超低渗—致密砂岩储层。该区地层变化复杂,既存在区域性的地层厚度变化,也存在同生断层及同生地堑的局部厚度突变,而且研究区岩性变化快,存在河流下切和侧切作用形成的大型切叠复合砂体。因此对该区开展详细、系统的沉积特征研究对油田下一步勘探开发具有重要的指导意义。本文针对研究区超低渗致密砂岩储层发育的复杂性,在前人对扶余油层地质研究的基础上,综合利用岩芯、测井、地震和分析测试等资料,建立了大安油田扶余油层高分辨率层序地层格架以及1相—2亚相—13微相的测井相模式,绘制了扶余油层各个时间单元的沉积微相图,总结了沉积相带的宏观展布规律并对每个时间单元进行了单砂体精细解剖分析,建立了大安油田扶余油层物性分布模式,同时绘制了不同尺度的微相控物性及砂体规律展布图。研究揭示了该区的沉积特征:大安油田扶余油层是西北物源控制下发育的河控三角洲沉积体系,砂体大部分呈西北~南东向展布,主要发育大面积条带状的分流河道以及河口坝、溢岸薄层砂、天然堤等微相,分流河道以小—中型河道为主,部分层位发育大型—特大型主体河道,河口坝微相具有河控性,单支呈条带状、具有多支性。在以上工作的基础上,确定了有效储层的物性下限,建立了超低渗储层分类评价标准,并用灰色关联分析法对影响储层评价的四种指标(渗透率、有效厚度、含油饱和度、微相类型)进行了权重分析,确定了四种评价指标的相关序,最后绘制了大安油田扶余油层优质储层平面预测图并对有利井区进行优选,提供了6口建议井位。
[Abstract]:The regional tectonic location of Da'an oilfield is located in the secondary structural belt of the Da'an Honggang terrace in the central depression of the southern Songliao Basin. The river controlled delta sedimentary system is mainly developed in the study area, and the reservoir type belongs to ultra-low permeability tight sandstone reservoir. The stratigraphic changes in this area are complex, there are not only regional changes in formation thickness, but also local thickness abrupt changes of syngenic faults and syngenic graben. Moreover, the lithology of the study area changes rapidly, and there is a large tangential composite sand body formed by river undercutting and lateral shear. Therefore, the detailed and systematic study of sedimentary characteristics in this area is of great significance to the further exploration and development of oil fields. In view of the complexity of the development of ultra-low permeability tight sandstone reservoir in the study area, based on the geological study of Fuyu reservoir by predecessors, the core, well logging, seismic and analytical testing data are comprehensively used in this paper. The high resolution sequence stratigraphic framework of Fuyu reservoir and the logging facies model of 1 phase -2 subfacies -13 microfacies in Fuyu reservoir of Da'an Oilfield are established. The sedimentary microfacies diagrams of each time unit of Fuyu oil layer are drawn. The macroscopical distribution law of sedimentary facies zone is summarized and the fine anatomy of single sand body for each time unit is carried out. The physical property distribution model of Fuyu reservoir in Da'an oilfield is established. At the same time, the microfacies controlled physical properties and sand body regularity of different scales are plotted. The study reveals the sedimentary characteristics of the area: the Fuyu oil layer in Da'an Oilfield is a fluvial delta sedimentary system developed under the control of the northwest provenance, and most of the sandbodies are distributed in the north-west to south-east direction. The distributary channel is mainly developed in a large area of strip distributary channel and estuarine dam, thin-layer sand, natural embankment and other microfacies. The distributary channel mainly consists of small and medium-sized channel, and some layers develop large and super large main channel, and the microfacies of estuarine and dam have river control. The single branch is striped and has multiple branches. On the basis of the above work, the lower limit of physical properties of effective reservoir is determined, the classification and evaluation standard of ultra-low permeability reservoir is established, and the four indexes (permeability, effective thickness, oil saturation) that affect reservoir evaluation are analyzed by grey correlation analysis. Based on the weight analysis, the correlation order of four evaluation indexes is determined. Finally, the plane prediction map of Fuyu reservoir high quality reservoir in Da'an oilfield is drawn, and the favorable well area is optimized, and six suggested well locations are provided.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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