马岭油田北三区延10储层微观地质特征及其对剩余油分布的影响

发布时间：2018-03-28 14:29

  本文选题：微观地质特征　切入点：渗流区间　出处：《西北大学》2015年硕士论文

【摘要】：马岭油田北三区延10储层目前已处于典型的中—高含水开发后期阶段,开发过程中注水沿高渗带突进,水驱动用程度低,导致其地质储量采出程度低。本文从微观地质特征与油水运动规律的关系,微观剩余油分布控制因素等方面对该问题深入剖析。综合高压压汞、油水相渗、恒速压汞、核磁共振等实验探究储层微观孔隙结构和渗流特征,进行储层物性下限和渗流区间的限定和划分,对微观剩余油的形成和分布进行实验模拟,探讨目前注水开发条件下微观剩余油形成机理和分布控制因素。主要研究成果有：(1)储层孔隙分布较为集中(120μm～140μm),属于较大孔隙—大孔隙；喉道半径平均值6.33μm,分布差异极大,微细喉道、细—中喉道、粗喉道三者均分,造成储层渗透率非均质性高、渗流差异明显。粗孔喉对渗流影响大,决定了渗透率贡献主值。(2)孔隙组合类型可划分为粒间孔型(27%)、溶孔—粒间孔型(52%)和微孔型(21%)三种,总体可动流体饱和度分均值偏高(83.94%),但在油水相渗中出现差异性,溶孔—粒间孔型样品含水率增加缓慢,采收率下降慢。注水在水驱油实验中均匀推进；粒间孔型样品油相和水相能力的互换迅速,渗流空间不大,水驱油实验中注水指—网状推进,易形成优势通道。微孔型样品在含水率上升的情况下油相渗透率递减迅速,产油能力衰减很快,水驱实验驱替条件高。(3)沉积成岩作用对微观孔隙结构的改造,岩石润湿性和流体性质在油水渗流过程中的干扰,再加上温度、压力、注水方式等各种开发因素的影响,共同控制着研究区储层驱油效率、微观剩余油类型和分布的复杂变化。(4)储层不可动孔喉半径下限0.280μm；无效渗流区间0.280μm～0.741μm,受弯曲,狭小的喉道控制；正常渗流区间0.741μm～4.571μm,由孔隙和喉道共同控制,渗透率贡献率较低；主流渗流区间4.571μm,总进汞量高,渗流能力强,其中7.968μm是研究区储层易发生水窜的优势渗流通道孔喉半径平均值。(5)储层综合分类与生产相结合：Ⅰ类(粒间孔型)储层孔喉半径非均质性强,初期产油量高,但目前大部分已被水淹；Ⅱ类(溶孔—粒间孔型)储层低含水稳产周期长,平面分布面积大、微观分布均匀,是进一步的有利开发目标；Ⅲ类(微孔型)储层微细喉道发育,孔隙结构相对较差,驱替条件相对较高,为劣势储层。
[Abstract]:At present, Yan10 reservoir in North third area of Maling Oilfield is in the late stage of typical medium-high water cut development. During the development process, water flooding along the high permeability zone and low water driving degree are necessary. In this paper, the relationship between microcosmic geological characteristics and oil-water movement law, microcosmic remaining oil distribution control factors and other aspects are analyzed in depth. Comprehensive high pressure mercury injection, oil-water phase infiltration, constant velocity mercury injection, etc. The microscopic pore structure and percolation characteristics of the reservoir are investigated by nuclear magnetic resonance (NMR) experiments, the lower limit of reservoir physical properties and the interval of percolation are defined and divided, and the formation and distribution of microscopic residual oil are simulated experimentally. The formation mechanism and distribution control factors of micro residual oil under the condition of water injection development at present are discussed. The main research results are as follows: the pore distribution of the reservoir is more concentrated at 120 渭 m or 140 渭 m, which belongs to the larger porosity and macropore, the average throat radius is 6.33 渭 m, and the distribution is very different. The permeability heterogeneity of reservoir is high, the difference of percolation is obvious, and the influence of coarse pore throat on percolation is great. It is determined that the pore assemblage types can be divided into three types: intergranular pore type (27), solution-intergranular pore type (522)) and micropore type (21). The total movable fluid saturation is higher than 83.94%, but there are differences in oil-water phase permeability. The water cut increases slowly and the oil recovery decreases slowly. The water injection is promoted uniformly in the water drive experiment. The intergranular pore sample has a rapid exchange of oil phase and water phase, and the percolation space is not large. In the experiment of water flooding, the water injection finger-net propelling is easy to form the dominant channel. When the water cut increases, the oil phase permeability decreases rapidly, and the oil production ability decays rapidly. The experimental displacement condition of water flooding is high. Xi 3) the transformation of sedimentary diagenesis to micro pore structure, the interference of rock wettability and fluid properties in the process of oil and water seepage, and the influence of various development factors such as temperature, pressure, water injection mode, etc. The reservoir displacement efficiency, the complex variation of microcosmic remaining oil type and distribution, the lower limit of the inmovable pore throat radius 0.280 渭 m, the invalid percolation interval 0.280 渭 m, are controlled by the curved and narrow throat channel, the reservoir displacement efficiency in the study area is controlled jointly. The normal percolation interval is 0.741 渭 m and 4.571 渭 m, controlled by pore and throat, the permeability contribution rate is low, the mainstream percolation interval is 4.571 渭 m, the total mercury content is high, the percolation ability is strong, Among them, 7.968 渭 m is the average value of pore throat radius of percolation channel, which is prone to water channeling in the study area. The combination of reservoir comprehensive classification and production is as follows: class I (intergranular pore type) reservoir has strong heterogeneity of pore throat radius and high initial oil production. But at present, most of them have been flooded, the low water cut and stable production period of type 鈪，

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