摘要
川中充西气田须四气藏储层非均质性强、气水关系复杂、气井产水量大,严重影响了气藏开发效果,开展气水分布规律研究已成为提出合理治水对策、提高气藏开发效果的基础。通过对地层水化学分析、气水层识别、气井产水特征及气水分布规律综合研究后表明:充西须四段地层水水型为封闭、还原的水文地球化学环境下的CaCl2型;气藏边水呈过渡带性质,无统一的气水界面;气水分异作用明显,为上气下水的常规气藏;断层末端及背斜曲率比较大的部位,裂缝相对发育,气井产水量较高。
Xujiahe 4 Member in Chongxi gasfield,central Sichuan Basin,is characterized by strong heterogeneity,complex gas-water contact and large water production,which seriously affect a development effect.A study on gas and water distribution law has become the foundation of proposing sound water treatment countermeasures and enhancing development effect.Comprehensive studies have been conducted on hydrogeochemical analysis of formation water,identification of gas and water formations,water-producing characteristics,and distribution law of gas and water.Results show that:(1) the formation water is CaCl 2-type in a closed and reduced hydrogeochemical environment;(2) the edge water shows the characteristics of transitional zone,without an uniform gas and water contact;(3) water-gas differentiation is obvious,and it is a conventional reservoir with upper gas and lower water;and(4) fractures are developed at fault terminal and some anticlines with big curvature,in which there are high water production.
出处
《天然气勘探与开发》
2012年第1期43-49,82,共7页
Natural Gas Exploration and Development
关键词
川中
充西气田
地层水
气水识别
多元判别
气水分布
central Sichuan,Chongxi gasfield,formation water,gas and water identification,multivariate discrimination,gas and water distribution
