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

Key words: 
• Huaqing area /
• Chang 6₃ /
• reservoir internal structure /
• delta-front /
• underwater distributary channel

Abstract: 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: 5^th hierarchy is the interface for composite sandbody; 4^th hierarchy is the interface for the single sandbody; 3^rd hierarchy is the interface for the hyperplasia of single sandbody; 2^nd hierarchy is the interface for the layer system group; 1^st 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.