overflow reservoir meaning in English

溢流式水库

Though matrix material from basalt is better than trachyte , the pore throats of trachyte reservoirs are better developed than basalt in respect of pore structures ; the overflow reservoirs have the best petrophysical conditions in trachyte and then the expulsion facies is the next
但从孔隙结构特征看，粗面岩储层孔喉较玄武岩发育程度好，粗面岩中以溢流相储层物性条件最佳，喷发相次之。