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广安地区须家河组有水气藏开发早期气水关系复杂,气井普遍产水。根据低渗有水气藏生产动态及渗流特征,分析利用储层地质方法、压力与埋深关系和区块内部地层压力场分布变化关系确定其压力系统情况;根据低孔低渗储层气水分异原理,通过储层物性对所需最小圈闭高度的控制分析认为,随着孔喉半径减小,毛细管力增大,对应区域含水饱和度高,气水过渡带高度增大,当气藏的闭合高度小于气水过渡带高度时,则形成气水同层气藏;储层的非均质性导致不同区域气水过渡带高度存在差异,是地层水控制压力系统划分的主要原因。分析结论为有水气藏的压力系统划分及其控制原因分析提供依据,对有水气藏的开发具有重要意义。
There is a complex relationship between gas and water in early Xujiahe Formation water-gas reservoir development in Guang’an area, and water production generally occurs in gas wells. According to the production dynamic and seepage characteristics of the low permeability water gas reservoir, the paper analyzes the relationship between the pressure system and the reservoir using the method of reservoir geology, the relationship between pressure and burial depth and the distribution of pressure field in the inner layer of the reservoir. According to the principle of heterogeneity, the control analysis of the minimum trap height required by the reservoir properties shows that with the reduction of the pore throat radius, the capillary force increases, the water saturation in the corresponding area is high and the height of the gas-water transition zone increases. When the closure height is less than the height of gas-water transition zone, gas-water reservoirs are formed. The heterogeneity of reservoirs leads to differences in the height of gas-water transition zones in different regions, which is the main reason for the division of pressure control system in formation water. The conclusion of the analysis provides the basis for the division of pressure system and the analysis of control reasons for the reservoirs, and is of great significance to the development of the reservoirs with water.