盐岩地下储气库泥岩夹层分布与组构特性研究

以江苏金坛地下盐岩储气库为例，在区域地质与场地工程地质条件分析的基础上，通过盐岩及夹层分布与岩性分析、泥岩夹层全岩X光衍射试验、黏土矿物X光衍射试验及定量分析、泥岩夹层的粒度试验、崩解试验及水理试验研究表明，金坛地下储气库岩盐层夹层主要为层间夹层与层内夹层，盐岩层间夹层分布稳定，厚度较大，不溶物含量高；盐岩层内夹层层数多，厚度薄，分布不均，不溶物含量低。盐岩层间泥岩夹层的主要矿物为黏土矿物，黏土矿物的主要存在形式为伊利石/蒙脱石混成矿物；泥岩夹层主要为细粒颗粒；泥岩夹层沿层理面崩解，层状开裂软化，具有微膨胀性。对于储库水溶建腔速度、成腔形状与运营期的腔体蠕变具有重要影响。

Distribution and structural fabric features of mudstone interlayer of rock salt in underground gas storage

Taking the Jintan rock salt gas storage in Jiangsu Province of China for example, regional tectonic and engineering geologic setting are analyzed. The mineral form, fine composing and hydrophilicity of mudstone interlayer between rock salt are studied by XRD test, granularity test and slaking test. The results are as follows. Mudstone interlayer are composed by interbedded mudstone and inter mudstone of rock salt. Interbedded mudstone of rock salt is thick with connected distribution. Inter mudstone of rock salt is thin with disconnected distribution. Clay is the main mineral of interbedded mudstone of rock salt. The illites/smectite mixed-layer mineral is the main formation of clay in interbedded mudstone. Granule particle is main in interbedded mudstone. Interbedded mudstone slakes by stratification bedding and little expansion. The character of interbedded mudstone affect the safety and running of Jintan gas storage.