Study on Formation Water Distribution Law in Tight Sandstone Gas Reservoir of Su X Block in West Area of Sulige, Ordos Basin, China
详细信息
- 责任者：Wang Jiping (State Key Laboratory of Continent Dynamics ; Northwest University ; Xi’an 710069 ; China) ; Li Yuegang
- 刊名：Journal of Chengdu University of Technology
- 出版年：2013
- 卷期：40(4)
- 关键词：砂岩油气藏 ; sandstone reservoir ; 油田水 ; oil field water ; 鄂尔多斯盆地 ; Ordos Basin
- 页码：p.387-393
- 图表：6 illus., 16 refs.
- 分类号：1003
- issnNo：ISSN1671-9727
- isbnNo：CN51-1634/N
摘要
The pore structure of a tight sandstone gas reservoir is complicated,the production of the gas wells is low and the development is easily affected by the formation water.Taking the Sulige gas field of Ordos Basin as example,by using the data of geology,well logging,testing and production dynamics and combined with the researches of hydrocarbon-generating intensity,diagenesis,structure and heterogeneity,this paper analyzes the main controlling factors of the gas field formation water and divides the formation water into three types: lower water of retention(Type Ⅰ),tight lentoid water of retention(Type Ⅱ) and isolated lens water of retention(Type Ⅲ),according to the genesis.Through the fine analysis of the east part of Su X Block where the well network is dense,this paper summarizes the distribution rule of different types of formation water and the production characteristics.The differentiation of the gas and water in the lower water of retention is obvious in the reservoir.The interpretation of logging indicates that the lower water of retention is usually the water reservoir or gas-bearing water reservoir,the thickness of the water body is thick,and the formation water is active.The tight lentoid water of retention is lens-shaped and spreads over the gas-bearing reservoir.The characteristic of the logging curves indicating that the reservoir contains water is not obvious and is difficult to identify.Although the interpretation of logging partly demonstrates that the tight lentoid water of retention is the gas-bearing reservoir or gas-and water-bearing reservoir,the trial pits show that there occurs water in this reservoir.The isolated lens water mainly spreads over the horizons above the gas-bearing reservoir and is easily identified.The interpretation of logging indicates that it is primarily the water-bearing reservoir.