【作者】 秦学杰；

【导师】 徐守余； 隋淑玲；

【作者基本信息】 中国石油大学 ， 地质工程， 2008， 硕士

【摘要】 孤岛油田中一区Ng3-6单元经过了近40年的开发,目前已进入到三次采油提高采收率开发阶段,但由于该单元缺乏精细的油藏模型,严重制约了稳油控水等工艺措施的进行。对该油田开展高含水期精细油藏模型研究,可以解决多年来油藏地质等方面存在的问题,为注聚开发油田的挖潜提供可靠的依据。本文以多学科综合研究为基础,以现代油藏描述、流体流动特征研究及油藏模拟为途径,强调以地质研究为主体,以储集层的精细划分与对比、砂体几何形态描述、储层属性特征研究和开发动态分析为主线,采用动静态结合的研究方法,对油藏进行了一体化研究,建立了孤岛油田中一区Ng3-6单元动态数字化油藏模型。根据孤岛油田地层特征,应用河流相沉积理论,进行了精细地层对比,将研究目的层Ng3-6分为4个砂层组19个小层。依据砂体韵律性、电性组合及砂体间隔、夹层分布,以时间单元为单位进行了层位细分,将8个主力小层细分为19个时间单元。在储层沉积特征研究、砂体沉积相带分析基础上,描述了储层展布;应用统计学和储层多参数定量评价方法对层间非均质性进行了定量评价,并详细分析了影响储层宏观非均质性的主要因素,认为Ng3-6单元各小层的储层物性受沉积相带的控制,从河床亚相向边缘亚相,储层物性逐渐变差,非均质程度逐渐增高。在上述研究的基础上,利用petrel随机建模技术,建立了油藏(构造模型、砂层厚度模型、有效厚度模型、孔隙度模型、渗透率模型)三维地质模型,精细刻画了工区在三维空间上的地质及流体属性。在储层特征研究基础上,基于流体的渗流特征受控于岩性的变化这一原理,分析了流体渗流规律,提出和建立了油藏渗流特征模型,使流体和油藏动态模型更能客观地描述油藏开发的动态特征,为动态分析和提高油藏采收率措施的研究奠定了坚实的基础。更多还原

【Abstract】 The Ng3-6 unit of I area in mid Gudao oil field has been exploited for nearly forty years and comes into development phase with the tertiary oil recovery to enhanced oil recovery. But because that there is no fine reservoir model, the technologic measures of keeping oil production rate and controlling water cut is restricted badly. The research for fine reservoir model with high water cut of this unit can deal with problems such as reservoir engineering and reservoir geology, and provide dependable reference for injecting polymer to exploit oil field.Based on the multidisciplinary comprehensive research, emphasized that the geology research is principal part and the fine partition and compare of formation, description of sand body, research of formation characters and analysis of exploitation performance is the masterstroke, the reservoir is researched integratively, and the dynamic and digitized reservoir model of Ng3-6 unit of I area in mid Gudao oil field is built by the way with modern reservoir description, research of fluid percolation characters and reservoir simulation. According to the formation characters of Gudao oil field and applying the theory of fluvial facies sediment, the formation is finely compared and the intended zone Ng3-6 is classified four sand groups and nineteen layers. According to the rhythmicity of sand body, electric property group, sand body interval and distributing of interbed, the formation is divided by units with time unit, and the eight main layers are divided into nineteen time units. The distribution of layers is described by the analysis of sedimentary facies of sand body and research of reservoir deposition characteristics. Anisotropy of layers is evaluated quantitatively by applying statistics and evaluated method of several reservoir parameters, and detailedly analyzed the main factors of affect macro anisotropy. The formation characters of layers of Ng3-6 unit are controlled by the sedimentary facies belt, the characters become worse gradually and degree of aeolotropism heightened gradually. Based on the above research, the 3D reservoir geological model including structure geometry model, thickness model, effective thickness model, porosity model and permeability model is built by using the random modeling of petrel software, and the geology and fluid property of work area is finely depicted in the 3D space. Based on the theory that fluid percolation character is controlled by the change of reservoir physical property and the research of reservoir character, fluid percolation rule is analyzed and reservoir percolation character model is presented and built. The fluid and dynamic reservoir model can impersonally describe the dynamic characters of reservoir exploitation, and establish the stability foundation for dynamic analysis and research of EOR.更多还原