鄂尔多斯盆地西北部盒8气藏气水分布规律研究

Law of Gas and Water Distribution in He8 Gas Reservoirs of Northwestern Ordos Basin

从鄂尔多斯盆地西北部地区上古生界二叠系下石盒子组盒8段气藏气水平面分布规律入手．从目的层段地层水性质、气藏压力、压实作用与流体单元、沉积特征与砂体连通性及气层的纵向分布特征等方面分析了气水分布的控制因素。研究表明该区气藏存在多个流体单元，同一流体单元内连通砂体上倾方向含气，下倾方向舍水，不同流体单元具有相对独立的气水界面。

Water and gas distribution control factors were analyzed by proceeding from analysis of the horizontal distribution of Gas-water in Permian Lower Shihezi Formation He8 Member reservoirs of the Upper Paleozoic, the northwestern Ordos Basin, and from the aspects of the formation water nature in the objective interval, gas reservoir pressure, Compaction and fluid unit, sedimentary characteristics and sand connectivity and the vertical distribution features of gas reservoirs, and so on. Research shows that： there are multiple units in the gas reservoirs of the area. In the same fluid unit, the connected sands contain gas on the updip direction and water on downdip. The different fluid units have a relatively independent air-water interface.