【作者】 闫百泉；

【导师】 马世忠；

【作者基本信息】 大庆石油学院 ， 油气田地质工程， 2007， 博士

【摘要】 目前,我国许多油田已进入高含水期,特别是大庆油田,已进入特高含水期开发阶段,剩余油空间上分布零散,挖潜困难,如何挖潜这些剩余油已成为目前提高采收率的重大难题。在剩余油分布的储层中,曲流点坝储层占了很大的比例,其内部渗流场分布特征、剩余油的形成与分布机制、挖潜手段的选择等一些列问题,是目前开发地质工作者面临的重大课题。尽管国内外大批学者从野外露头和现代河流沉积及地下单砂体精细解剖等方面进行了探索,但尚未完全从机理上揭示曲流点坝内部建筑结构对渗流场的控制作用及其如何影响剩余油的形成与分布,无法进一步给出相应的挖潜措施。本文通过对国内外相关文献和研究成果的广泛调研,针对大庆油田南部杏六区葡Ⅰ33曲流河沉积储层,借助于水平井及高密度井网资料,对其可分性进行了充分论证,将该单元进一步划分成葡Ⅰ33a、葡Ⅰ33b两个河流期沉积单元,并对葡Ⅰ33a单砂体内部建筑结构进行了精细解剖,建立了曲流点坝三维属性模型。参考经典理论模式,结合已得到的研究区曲流点坝内部建筑结构模式,基于沉积动力学研制两种物理实验模型并进行了相关驱替实验研究。系统分析了内部建筑结构对储层非均质性的控制作用,提出了渗流场三维分布模式。科学的论证总结了剩余油形成与分布的4种控制模式,并针对具体模式提出了各种挖潜方案。自主创新成果主要包括:基于水平井资料的曲流点坝识别方法及相应参数提取技术;基于沉积动力学研制并构建两种实验模型及相关驱替实验方法;注入剂波及高度为储层的1.3/3,平行侧积方向呈阶梯状;地下曲流点坝精细解剖与实验结果相结合,系统论证了曲流点坝储层在开发过程中的渗流场分布特征,提出了曲流点坝内渗流场三维分布模式;提出了曲流点坝内部建筑结构控制剩余油形成与分布模式。本文的研究成果表明,单砂体内部建筑结构对储层的非均质性具有重要的控制作用,剩余油受侧积夹层空间建筑结构及单一侧积体内部渗透率空间变化、3级界面阻流等影响,主要分布在储层的中上部。研究成果为曲流点坝储层挖潜提供了充分的地质依据,对挖潜措施的选择具有地质导向作用。同时,本文的研究成果对进一步进行曲流点坝储层数值模拟提供了科学的地质模型,具有重要的指导意义。更多还原

【Abstract】 Now many oil fields have went into high water-cut period. Especially the Daqing oil field has went into later development stage of extra-high water-cut period. The distribution of remaining oil in space is highly scattered. How remaining oil was produced has become a great difficult problem of increasing recovery efficiency. The point bar of meandering stream channel accounted for a substantial proportion of reservoirs with containing remaining oil. Many problems, including distribution of internal filtration field, distribution mechanism of remaining oil and producing approaches, are great topics of development geologist. Although many experts domestic and abroad have carried out relevant study from outcrop, modern fluvial sediment and fine dissecting underground monosandstone, but, they haven’t completely revealed control of internal architecture of the point bar to field of filtration and how distribution mechanism of remaining oil was affected so far.On the basis of domestic and abroad research and technical literature and results of study, considering of PⅠ3 3 meandering stream sedimentary reservoirs in Xing6 areas of southern of Daqing oilfield, applying horizontal well and logging information of close-space-wells, the divisibility of PⅠ33 was demonstrated and further subdivided two sedimentary units(PⅠ33a, PⅠ3 3b ). At the same time, internal architecture of the point bar in PⅠ33a was fine dissected and 3D property modeling of the point bar sand was built. Referred to classic theoretic model, combined internal architecture model of the point bar in the study area, and based on sedimentary dynamics, two physical models and relevant methods of displacement experiment were developed. the internal architecture of point bar in meandering stream channel and its control to the heterogeneity of reservoirs was systematically analyzed. Then 3D distribution model of filtration field was proposed.Four control models about formation and distribution of remaining oil were scientific demonstrated and summarized, and its producing approaches were proposed. The self-innovative technologies mainly are: the recognized methods of single point bar of meandering stream channel and extracted technologies of its relevant parameters; Based on sedimentary dynamics, development of two physical models and relevant methods of displacement experiment; swept height of injecting material is 1.3/3 of reservoirs, it parallel to lateral direction and is step-shaped; combined fine dissection of internal architecture of the point bar in with experimental results, systematically demonstrated distribution characteristics of filtration field in development in the point bar, and 3D distribution model of filtration field in the point bar was proposed; the proposal of internal architecture of the point bar controlling formation and distribution model of remaining oil.The outcomes of this text demonstrated it, which internal architecture of monosandstone have important controlling action to the heterogeneity of reservoirs, and remaining oil mainly distribute the middle and upper of reservoirs, because of the architecture of internal interlayer in space, the steric change of permeability in single lateral bedding, the choking of 3-level interface and so on. The outcome of this text provided full geological references for exploration of remaining oil in the point bar of meandering stream channel and had geological direction to selection of producing methods. At the same time, the outcome of this text can play an important role for further study of numerical simulation of the point bar reservoirs.更多还原