大张坨地下储气库地质动态及运行效果分析

GEOLOGICAL PERFORMANCE OF DAZHANGTUO UNDERGROUND GAS STORAGE AND ITS OPERATION EFFICIENCY ANALYSIS

大张坨储气库地处我国天津市大港区南 5公里的独流碱河的滞洪区内 ,构造位置处于大港油田板桥油气田构造带的西部 ,是一个在正进行循环注气开发的凝析气藏———大港油田板桥油气田B5 2气藏———的基础上改建而成的地下储气库 ,目的层为沙河街组沙一下段板二油组的砂岩储层。该气藏 1994年投入循环注气开发 ,2 0 0 0年改建为我国第一个天然气地下储气库 ,并于 2 0 0 0年 12月投入冬季调峰生产 ,已完成了二个冬季调峰采气、一个注气周期的生产 ,目前正进行注气生产。通过对大张坨储气库运行资料的分析 ,系统总结了有水气藏改建储气库的生产运行特点和动态规律 。

Dazhangtuo underground gas storage is located in the stagnantly flooded area of the Duliujianhe River five kilometers south of the Dagang District,Tianjin.Storage structure is situated in the western part of the Banqiao field structural belt of Dagang Oil Field and the underground gas storage was set up through reforming on the basis of the B52 gas reservoir in Banqiao field of Dagang Oil Field.This reservoir is a condensate gas reservoir in which a recycle gas injection development is carrying out,its objective formation being the sandstone reservoir of Ban-2 oil bearing layers belonging to the lower interval of the first member of Shahejie Formation.The recycle gas injection development was adopted in 1994 for this gas reservoir which was reconstructed as the first underground gas storage in China in 2000 and put into winter peak shaving production in December 2000.Up to now,two winter peak shaving gas production and one gas injection cycle production have been finished and the 2002 gas injection production year is carrying out at present.Through analyzing the operation data on Dazhangtuo underground gas storage,the production operation characteristics and performance rules of the gas storage reconstructed from a water carrying gas reservoir are summarized in the paper,which is of a guiding role in the construction,operation and management of the other gas storages in China.