华庆地区长63储层内部建筑结构模式分析

储层内部建筑结构是评价油气藏、改善水驱开发效果、提高油气采收率的基础和关键。因此,文章以华庆地区长6₃层水下分流河道为例,利用野外露头照片和连井剖面等资料,应用petrel软件,系统建立了华庆地区长6₃储层构造模型和储层参数(孔隙度、渗透率和泥质含量)模型。研究结果表明,三角洲前缘水下分流河道构型界面可划分为5级:其中5级为同期水下分流河道复合砂体的界面,4级为水下分流河道单一砂体的沉积界面,3级为水下分流河道单一砂体内部增生体的界面,2级为增生体内部简单的层系组界面,1级为增生体内部单个交错层系的界面。研究区砂体内部存在侧积夹层、前积夹层和垂积夹层3种类型的夹层。建立的研究区长6₃构造模型总体趋势为西低东高。从孔隙度、渗透率和砂泥岩分布模型图可以看出研究区属于低孔特低渗储层。结构解析结果客观的反映了长6₃储层内部基本单元的展布形态,真实再现了研究区内部砂体的空间形态分布模型图。

The Internal Structure Pattern Analysis of Chang 63 Reservoir of Huaqing Area

Reservoir architecture is the basis and the key that evaluating oil and gas accumulation, improving the water flood development efficiency and hydrocarbon recovery for maturing field. Therefore, this article does a research about underwater distributary channel of Chang 6₃ reservoir of Huaqing area. It uses the outcrop pictures and data of the well profile and PETREL software to establish the structural pattern and reservoir parameters (porosity, permeability and shale content) model of Chang 6₃ reservoir in Huaqing area. The results show that the architecture interface of the underwater distributary channel can be divided into five hierarchies: 5th hierarchy is the interface for composite sandbody; 4th hierarchy is the interface for the single sandbody; 3rd hierarchy is the interface for the hyperplasia of single sandbody; 2nd hierarchy is the interface for the layer system group; 1st hierarchy is the interface for the single staggered formation. The interlining of sandbody exist three types: Lateral interlining, Progradation interlining and vertical interlining. The overall trend of Chang 6₃ structure model is high in the east and low in the west, it can be seen that the study area belongs to low porosity and low permeability reservoir from the porosity, permeability and sand shale distribution model. This paper objectively reflects the internal distribution shape of basic unit of Chang 6₃ reservoir layers, and reproduced the space form distribution model of sandbody.