岩石分类方法在油藏数值模拟中的应用

摘要

以海外某油田前期研究方案为例,系统阐述了基于岩石分类的油藏精细描述和数值模拟方法.根据岩心、物性、薄片、扫描电镜以及毛管压力等数据的分析,将储层岩石细分为4类,并分别建立了4种岩石类型的渗透率解释模型和相对渗透率曲线,在此基础上利用三维地质建模和数值模拟技术完成对油田的整体开发指标预测.研究结果表明,精细划分岩石类型不仅能够大幅提高非均质储层渗透率的解释精度,而且可以满足前期研究阶段对不同类型储层下渗流规律的精确表征,使分类后的开发指标预测更加合理.%Taking an oversea oilfield as an example, a set of fine reservoir description and numerical simulation method with classified rock type is proposed in this paper.Four rock types are classified according to the analysis result of core,physical properties,thin section,scanning electron microscope and capillary pressure.And four per-meability interpretation models and relative permeability curves can be classified respectively based on rock types. Finally the 3D quantitative characterization can be built by geological modeling and numerical simulation for the whole oilfield production prediction.The result shows that this method can not only improve the interpretation accu-racy of heterogeneous reservoir permeability,but also meet the requirements of accurate description for oil flow laws in different types of rock.Only in this way,can we get more reasonable development index forecast.