马岭油田北三区延10储层非均质性研究

发布时间：2018-04-11 13:49

  本文选题：马岭北三区 + 延10储层　； 参考：《西北大学》2017年硕士论文

【摘要】：马岭油田北三区延10储层经过十余年的开采,目前已处于中高含水阶段,水淹程度复杂,剩余油分布零散且难以预测,对下一步的开发提出了难题。本文在对研究区小层精细划分,沉积微相划分,局部构造特征辨别的基础上,开展对研究区非均质性研究,从宏观和微观两个角度,通过扫描电镜、铸体薄片、高压压汞、恒速压汞、油水相渗以及真实砂岩水驱油实验等实验手段,对非均质性进行表征,并简析了研究区非均质性的影响因素,主要取得以下结论认识:1、研究区延10储层属于从下到上由辫状河亚相向曲流河亚相过渡的河流相沉积体系,河道砂体在平面上连续性较好,纵向上互相叠加,整体构造较为平缓,局部发育微构造。2、研究区延10储层宏观上平面非均质性较强,主要受沉积微相分布控制;各小层层内非均质性较弱,但从上到下依次变强;层间非均质性较弱。3、研究区储层孔隙类型有粒间孔、溶孔以及晶间孔,孔隙组合类型有粒间孔型、粒间孔-溶孔型以及粒间孔-晶间孔型,其微观非均质性依次增强。通过高压压汞和恒速压汞实验,研究区微观非均质性整体较弱,其中微观孔隙非均质性较弱,而微观喉道的非均质性较强。4、不同孔隙结构具有不同的渗流特征,影响驱油效率的因素有孔渗参数、非均质程度、水驱倍数、驱替压力以及润湿性,其中最主要因素是孔隙结构的非均质程度。5、沉积作用控制了砂体展布,影响了储层平面上以及层内的非均质性,产生了微构造;成岩作用的不均衡性导致了储层微观非均质性;由于注水开发导致储层内水洗程度不同,从而导致非均质性的加剧。
[Abstract]:After more than ten years of exploitation, Y10 reservoir in North third area of Maling Oilfield has been in the middle and high water-cut stage, the degree of water flooding is complex, the distribution of remaining oil is scattered and difficult to predict, and a difficult problem is put forward for the next development.On the basis of fine division of sublayer, division of sedimentary microfacies and discrimination of local structural characteristics, the heterogeneity of the study area was studied in this paper. From the macro and micro perspectives, the study was carried out through scanning electron microscopy, thin sheet casting, high pressure mercury injection.The heterogeneity was characterized by means of constant velocity mercury injection, oil-water phase permeation and real sandstone water flooding experiments, and the influencing factors of heterogeneity in the study area were briefly analyzed.The main conclusions are as follows: the Yan10 reservoir in the study area belongs to fluvial facies sedimentary system from braided river subfacies to meandering river subfacies. The river channel sand body has good continuity on the plane and superimposed on each other longitudinally.The whole structure is relatively smooth, the microstructure is developed locally, and the macroscopic plane heterogeneity of Yan 10 reservoir is strong, which is mainly controlled by the distribution of sedimentary microfacies, the heterogeneity in each small layer is weak, but it becomes stronger from top to bottom.The reservoir pore types in the study area are intergranular pore, dissolved pore and intergranular pore. The pore assemblage types include intergranular pore type, intergranular pore dissolution type and intergranular pore-intergranular pore type, and the microscopic heterogeneity increases in turn.Through the experiments of high pressure mercury injection and constant velocity mercury injection, the microcosmic heterogeneity of the studied area is relatively weak, in which the microscopic pore heterogeneity is weak, and the microscopic throat channel heterogeneity is stronger. 4. Different pore structures have different percolation characteristics.The influencing factors of oil displacement efficiency are porosity and permeability parameter, heterogeneity degree, water drive multiple, displacement pressure and wettability. The most important factor is the heterogeneity degree of pore structure .5.Sedimentary action controls the distribution of sand body.It affects the heterogeneity in the reservoir plane and in the formation, and produces microstructures; the uneven diagenesis leads to the microscopic heterogeneity of reservoir; the water flooding development leads to the different degree of water washing in the reservoir, which leads to the aggravation of the heterogeneity.
【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】：P618.13
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本文编号：1736263