含有夹层的薄盐层中盐穴储气库运行压力的确定  

DETERMINATION OF OPERATING PRESSURE FOR GAS STORAGE WITH SALT CAVES IN THIN SALT BEDS WITH INTER-BEDS

作　　者：刘飞[1] 宋桂华[1] 李国韬[1] 温庆和[1] 

机构地区：[1]CNPC大港油田集团钻采工艺研究院

出　　处：《天然气工业》2004年第9期133-135,共3页Natural Gas Industry

摘　　要：建设地下盐穴的盐矿主要有两种 :盐丘和薄盐层。薄盐层中经常含有平面上连续分布的夹层和散布的杂质。这些夹层和杂质主要有石膏、泥页岩、白云石和石灰石。我国江苏金坛盐矿即属于该类含有夹层和杂质的薄盐层 ,与盐丘相比 ,含有夹层和杂质的薄盐层以下特点 :①不同岩性的夹层造成盐腔剖面上岩性的变化 ;②盐层几何尺寸横向大 ,纵向小。文章主要介绍了国外运用解析方法和数值分析的方法确定含有夹层的薄盐层中盐穴储库运行压力的方法 ,主要认识是 :①最大运行压力与盐层和夹层的破裂压力有关 ;②最小运行压力要保证盖层不发生坍塌 ,盐腔体积不发生大幅度减小 ;③周期性变化的运行压力会引起地应力的变化 ,导致不同岩性层位形变不同 ,甚至发生整体滑移。There are 2 kinds of salt mines to build underground salt caverns. They are salt dome and thin salt beds. Usually, inter-beds that spread horizontally and continuously and distributed impurities exist in the thin salt beds. The inter-beds and impurities consist of gypsum, shale, dolomite and limestone mainly. Jingtan salt mine in China right belongs this kind of thin salt beds with inter-beds and impurities. Comparing with salt dome, the thin salt beds with inter-beds and impurities have the following characteristics: (1) The litho-logy changes along the profile of salt chamber since the inter-beds with different litho-logy exist; (2) The geometric size of the salt beds appears large at horizontal direction and small at longitudinal direction. The article introduces the decision-making method of operating pressure for gas storage with salt caves in thin salt beds with inter-beds abroad by analytical method and numeral analysis method. The main opinions are: (1) The maximum operating pressure is related with the cracking pressure of the salt bed and inter-beds; (2) The minimum operating pressure is to guarantee the cap-rock not collapsing and the volume of salt chambers not greatly reducing; (3) The operating pressure with cyclic change will cause change of the earth stress, and different deformation of different litho-logic beds, even whole sliding.

关 键 词：盐层 盐穴 夹层 储气库 破裂压力 泥页岩 岩性 盐丘 盖层 层位 

分 类 号：TE972[石油与天然气工程—石油机械设备]