关键词: 储层特征描述, 　三维地质建模, 　数值模拟

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