摘要：

济阳坳陷孤东油田七区西馆陶组上段为典型的曲流河沉积，其中Ng522单层发育2个大型点坝砂体，在系统的点坝砂体构型表征的基础上，探索了储集层构型界面的几何建模方法，将构型界面模型嵌入到基于三维结构化网格体的相模型中，建立了研究区26-295井区真正意义上的、更符合地下实际的三维储集层构型模型，再现了成因微相内部构型单元及界面的空间分布特征，满足了三维油藏数值模拟的需要。点坝内部的侧积层向废弃河道方向倾斜，延伸到距点坝顶三分之二的位置，点坝砂体表现为“半连通体”特征。建立了点坝内部剩余油分布模式，并指出挖潜措施。该方法在研究区应用效果较好，并可以推广到其他相似油田，这对丰富储集层地质学理论及提高油田开发效率均具有重要意义。

关键词: 济阳坳陷, 孤东油田, 储集层构型, 剩余油, 储集层建模, 点坝

Abstract:

The Upper Guantao Formation in west 7th Block of the Gudong Oilfield，Jiyang Depression，is dominated by meandering fluvial deposits， among which two large point bar sandbodies were developed in the layer Ng522. Based on the systematic characterization of subsurface reservoir architecture of point bar reservoir， the geometry modeling method of architectural bounding surface is investigated here， and the architectural bounding surface model is embedded into the facies model based on the 3D structured grid mesh. The 3D reservoir architectural modeling of well 26-295 area is established， and it is more accordant to the practical formational conditions in a real meaning. The spatial distribution characteristics of architecture element and bounding surface within the microfacies are reconstitued excellently， which meets the requirements of 3D numerical reservoir simulation. The results show that lateral accretion beds in the point bar are inclined to the abandoned channel and extend to the position of  2/3  to the top of point bar which is presented as “semicommunicated sandbody”. The remaining oil distribution patterns within point bar sandbodies are established and the potential exploitation measures are proposed. The application effects of the reservoir architecture characterization and modeling in the study area are good and can be applied to other similar oilfields. It has important significance both in enriching reservoir geology theory and enhancing exploitation efficiency of reservoirs.

Key words: Jiyang Depression, Gudong Oilfield, reservoir architecture, remaining oil, reservoir modeling, point bar