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广安地区是四川盆地中部上三叠统须家河组天然气最具勘探潜力的区块之一,其复杂的气水关系一直制约着气藏的高效开发,弄清气水分布情况成为当前气藏开发过程中的首要任务。运用气水分异理论、水蒸气含量计算、试气试采分析等研究手段,分析了气藏的气水分布情况以及产水特征。研究表明,广安气藏气水分布特征仍遵循上气下水特征,气水过渡带纵向范围较宽;通过经验公式确定地层条件下天然气水蒸气含量为0.0521～0.0927m3/104m3,如果生产中水气比大于该值,气井很可能产地层水;试气试采分析认为:产水量较高的井主要集中在须六段气藏A区构造北北东部和B区,以及须四段气藏部分区域。
The Guang’an area is one of the most probable gas exploration potentials of the Upper Triassic Xujiahe Formation in the central Sichuan Basin. Its complex gas-water relationship has restricted the efficient development of gas reservoirs and clarified the distribution of gas and water to become the current gas reservoir The top priority in the development process. The gas and water distribution and gas production characteristics of gas reservoirs are analyzed with the research methods of gas and water differentiation theory, water vapor content calculation and test gas test and production analysis. The results show that the gas and water distribution characteristics of Guang’an gas reservoir still follow the features of upper gas and water and the vertical range of gas-water transitional zone is wide. The water vapor content of natural gas is 0.0521 ~ 0.0927m3 / 104m3 under the formation conditions through empirical formula. The gas wells are more likely to produce formation water than that of the gas wells. According to the analysis of test gas production and test, the wells with higher water production are mainly concentrated in the NE North and B zones in the A zone of the Xuerju Member gas reservoirs, area.