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我国的西气东输工程从新疆塔里木油田到上海，管线长度达4000公里，为确保对长江三角洲地区安全稳定的供气，就必须在长江三角洲地区建设地下储气库，从而保证在管线故障期间应急供气，同时利用地下储气库调节冬季和夏季用气量的差异，保证长输管线的高效、平稳运行。在长江三角洲地区经地库址选择，目前准备将常州盆地的金坛盐矿用以建设地下储气库。盐穴地下储气库主要选择在盐层或盐兵上，利用水溶方式形成地下溶腔进行储气，选择合适的建库地址要结合地质、水、工程等诸多因素，造腔过程中需要采取一系列控制技术，在造腔过程中还要及时采取声纳测井技术进行跟踪监测，造腔过程的检测及腔体完成后的密封安全性检测是气库能否投入运行的关键。

Underground Gas Storage in Salt Caverns

The West-East Gas Transmission Pipeline goes from Tarim to Shanghai in China.The length of the pipeline is more than 4 000 km.The underground gas storage must be set up in Yangtze River deltaic area to guarantee safe and stable gas delivery in the area.The storage can guarantee gas delivery during pipeline emergency.Also,it can balance the season related demand difference to guarantee efficient and smooth operation of the long pipeline.Jintan Salt Mine of Changzhou Basin is chosen to set up the underground gas storage in Yangtze River deltaic area.Underground gas storages in salt caverns are usually established in salt beds or salt domes.The caverns formed by water solution are used for gas storing.The appropriate position to establish the storage is decided by many factors such as geological,hydrological,engineering conditions,etc.Several control techniques will be taken during the cave building process.The sonar well log also will be conducted timely for trace monitoring during the cave building process.It is the key to inspect the security and airproof of the storage after the cave building process is completed to see if the storing can be put into operation.