Abstract: In recent years, low permeability reservoirs have accounted for 70% of China's new oil reserves, among which the Ordos basin accounts for more than half, with considerable development potential. Therefore, the efficient development of low permeability reservoir is urgent.. In order to fully understand the properties of reservoir before development, using core observation, rock thin section and other test data, this paper focused on the research of reservoir petrology characteristics, reservoir sedimentary microfacies and sand body distribution, reservoir physical characteristics and heterogeneity of Chang 4+522 formation in Wuqi oilfield in Ordos basin. Then, based on these research results, 3D geological model of reservoir was established. The results show that Chang 4+522 formation has the rock type of fine⁃grained feldspar sandstone; mainly develops subaqueous distributary channel sedimentary microfacies and large thickness, wide distributed and good continuity sand body; belongs to low porosity, low permeability heterogeneous reservoir. On the basis of comprehensive geological studies, the structural model, phase model, porosity and permeability model of Chang 4+522 reservoir in Wuqi oilfield established are accurate and reliable. Studies on reservoir physical characteristics plays a good constraint role in the modeling process. The established 3D static model of the reservoir will serve as the foundation for dynamic flow simulation in the next step. The research approach can also provide reference for the preliminary research of the similar project.

Key words: Reservoir characterization, 3D reservoir modeling, Numerical simulation

摘要： 近年来，我国石油新增储量中低渗透油藏储量占比达70%，其中鄂尔多斯盆地占一半以上，开发潜力可观。因此，低渗透油藏的高效开发是当务之急。为了在开发前充分了解低渗透层位的储层特征，以岩心观察、岩石薄片为基础，对鄂尔多斯盆地吴起低渗透油田延长组长4+522储层的岩石学特征、储层沉积微相及砂体展布、储层物性特征、非均质性等进行了详细研究。在此基础上，利用测井数据建立了研究区的储层三维地质模型。结果表明，吴起油田长4+522油层组岩石类型主要为细粒长石砂岩，主要发育水下分流河道沉积微相，砂体厚度较大，分布面积较广且连续性较好，属低孔特低渗的非均质性储层；在综合地质研究基础上建立的长4+522层的构造模型、相模型、孔隙度、渗透率模型准确可靠，前期的研究结果在建模过程中起到了很好的约束作用，所建立的储层三维静态模型为油藏数值模拟及下一步开发部署提供了良好的基础，研究思路也可以为后续低渗透油藏开发的前期研究提供借鉴。

关键词: 储层特征描述, 　三维地质建模, 　数值模拟