【作者】 刘洁；

【导师】 陈程；

【作者基本信息】 中国地质大学（北京） ， 矿产普查与勘探， 2010， 硕士

【摘要】 储层非均质性是影响油气渗流和驱替过程中最直接的因素之一,它对剩余油的分布有较大的影响。Palogue油田位于苏丹3/7区Melut盆地的北部,目前正处于油田评价阶段。前人的研究表明该油田储层主要是以辫状河为主的陆相沉积地层,砂体发育,物性较好,孔渗较高。本文围绕非均质性评价这一核心目的,综合运用了沉积学、石油地质学、开发地质学、储层三维地质建模等理论与技术方法,对Palogue油田Yabus砂组储层的层间非均质性、层内非均质性、平面非均质性以及微观非均质性进行了研究,并在基础地质研究的基础上,应用随机模拟的方法,建立了该区的非均质概念模型,准确、真实、客观的反映了研究区储层的非均质特征。研究表明,储层的孔隙度和渗透率均较高,物性较好,分层系数低,分层性差,各个砂组之间的层间非均质性较弱,砂组内的单砂层间不会产生层间干扰,而在整个含油层系规模内单砂层间非均质性则比较严重;在层内,由于交错层理的复杂性和层内随机分布的夹层,影响了渗透率的各向异性,研究表明其层内非均质性以中等为主;在平面上,研究区主力单砂层的渗透率很高,特别是沿着北西-南东方向,变化幅度小,非均质性较弱,而在北东-南西方向渗透率的变异程度高、非均质性强,沉积微相是控制储层非均质性的重要因素,沉积微相的平面展布与储层参数的平面分布有较好的相关性;通过对Yabus砂组储层的岩石类型、结构特征、孔隙与喉道的类型、孔喉分布特征的分析,认为Yabus组储层总体上具有特高孔、特高渗、中细孔喉、孔喉分选差的特征,储层的微观非均质性整体上比较严重。根据研究区的特征和所有资料的情况,选取FAL-1断块为重点研究区块,运用Petrel 2007建模软件,建立了Palogue油田非均质概念模型,包括沉积微相模型、流动单元模型、属性模型(包括孔隙度模型和渗透率模型),准确的反映了研究区储层非均质性的特点,模拟结果与地质认识相符。基于以上的研究,综合评价了Palogue油田辫状河储层的非均质性,对油田开发有重要的意义。更多还原

【Abstract】 Reservoir heterogeneity is the major factor to influence on the seepage flow and driving of petroleum, which plays an important role in the distribution of remaining oil. Palogue oilfield locating in the north of Melut Basin in 3/7 area of Sudan, which is still under the stage of field evaluation. Results of regional research show that the reservoir of Palogue oilfield belongs to continental facies sedimentary strata predominated by braided rivers. The reservoir has the typical characteristics of good development of sand body , high porosity, high permeability, and the reservoir physical property is good.The paper focuses on the evaluation of heterogeneity, using different theories and techniques of many subjects including sedimentary, petroleum geology, development geology, modeling of geology and so on, to do the research about reservoir in-layer heterogeneity, interlayer heterogeneity, plane heterogeneity and microscopic heterogeneity. On the base of basic geological study, it builds the heterogeneity conceptual model by using reservoir stochastic simulation technology. The model shows the characteristics of reservoir heterogeneity objectively, correctly and externally.Research shows that the reservoir of Palogue oilfield is characterized by high porosity and permeability. The reservoir interlayer heterogeneity research observes that the stratification is weak according to low stratification coefficient, interlayer heterogeneity between the various sand groups is weak, and it does not produce interlayer interference in sand group. But the heterogeneity between the single sand is quite serious in the scale of entire oil-bearing series. In the layer, the complexity of cross beddings and interlayers affect the permeability anisotropy, research shows that the in-layer heterogeneity is medium. In the plane, the main study area has high permeability of the single sands. The reservoir is characterized by great plane discrepant distribution of permeability, especially along the direction of northeast-southwest, the permeability variance is the most remarkable. Sedimentary microfacies is the most important factor to impact reservoir heterogeneity, the horizontal distribution of reservoir parameters is fairly well correlated with the planar distribution of the microfacies. On the base of research on reservoir micro-characteristic, such as lithologic property, types of pore and throat, pore throat distribution and so on, reservoir microscopic heterogeneity is introduced. Reservoir of Yabus Group is characterized by coarse pores, fine throat, weak separation of pore and throat, which indicates that the micro heterogeneity is serious.According to the results of reservoir heterogeneity research, with the software of Petrel 2007,established the heterogeneity conceptual model of braided river reservoirs in Palogue oilfield, which include sedimentary facies model, flow unit model, porosity model and permeability model. The simulation results accord with the geological knowledge, and reflect the heterogeneity of Palogue oilfield exactly.Based on the above researchs, the paper gets a comprehensive evaluation for the heterogeneity of the braided river reservoirs in Palogue oilfield, and has the great significance to oilfield development.更多还原