玄武岩盆地供水前景研究——以云南马树盆地为例

A Study of Water Supply Prospect of a Basalt Basin——By the Example of the Mashu Basalt Basin,Yunnan

本文以云南马树盆地为例,通过水文地质调查、物探、钻探、抽水试验、水质分析测试等手段,查明了马树盆地自上而下的三层水文地质结构:上层(0~9.0m)主要为湖积砂砾及粘土层,富水性差,不具供水意义;中层(9.0~28.5m)为节理裂隙发育的二叠系峨眉山组玄武岩(P3em),富水性好,单井推算最大涌水量可达504.4m^3/d,受上覆含砾粘土层的阻隔,水质优良(Ⅰ类),可作为当地居民的饮用水源;下层(28.5~60.0m)峨眉山组玄武岩节理裂隙不发育,为相对隔水底板。本研究对于玄武岩区找水工作具有借鉴意义。

The Mashu basalt basin in Yunnan has such three-layer hydrogeological structure as upper layer(0-9 m)composed of lacustrine gravel and clay bed poor in water-abundance without supply water capacity,middle layer(9-28.5 m)composed of the Permian Emeishan basalt rich in joint and water with calculated maximum single well water yield of 504.4m^3/d,and lower layer(28.5-60 m)consisting of the Permian massive basalt on the basis of geological survey,drilling,geophysical exploration,pumping test and water quality analysis.Underground water in the middle layer is a high quality drinking water.