常温下不同浓度盐溶液中石膏细观结构衍化研究

Micro-structure Development Research of Gypsum Salt Rock Soaked in Different Concentrations of Brine at Normal Temperature

为了研究层状盐岩矿床水溶开采及其中油气储库建造过程中、盐溶液对石膏夹层溶蚀破坏的影响,以及了解不同浓度盐溶液作用下石膏的细观结构变化,本文使用扫描电子显微镜(SEM),对常温下不同浓度盐溶液溶浸作用下的石膏试件进行了细观结构衍化及其特征分析。研究发现:在不同浓度盐溶液中,由于晶体溶浸水化、吸水膨胀以及饱和溶液中晶体析出等作用影响,石膏晶体结构与尺寸会发生不同程度的变化。在不同浓度盐溶液中石膏晶体细观结构的变化,严重影响石膏夹层的物理力学特性,开展不同环境(温度、浓度、压力等)条件下石膏及相关盐岩夹层物理力学特性研究有重要理论意义与应用价值。

To investigate the influence of brine on the dissolution and the destruction of gyp- sum salt rock during the solution mining and the construction of oil and gas storage cavern in salt mine and to learn about the micro-structure development of gypsum in different concentrations of brine, the micro-structure of gypsum infiltrated in different concentration brines at normal tern perature was analyzed by usingSEM. Studies show that at different concentrations, the structure and size of crystals were different for the combined action of the dissolution and hydration of crys- tal, water swelling, crystal precipitation and so on. Because the development of micro-structure of gypsum crystal in different concentration brines would affect the physical and mechanical prop- erties of gypsum sandwich greatly, the research of physical and mechanical properties of gypsum and related salt rocks under different conditions （temperature, concentration, pressure and so on） has important theoretical significance and applications.