摘要
四川盆地南缘分布的红层区,相比盆地内部具有地貌类型众多、地形坡度大、构造发育,地层倾角大的特点,对其咸水发育规律的研究鲜有报道。通过水文地质调查、水文地质钻探、取样分析测试等方法,发现咸水发育主要受地层岩性和地下水循环条件控制。红层砂泥岩中含可溶盐是咸水发育的物质基础,含泥岩地层中更易发育咸水。地下水类型、斜坡结构、深度及断层主要影响了地下水的循环交替条件,循环交替强烈发育淡水,循环交替滞缓则会发育咸水。断裂带深部成分复杂的咸水会因浅部地下水的开采而上涌,造成浅部地下水咸化。四川盆地南缘红层咸水发育规律的研究,对该区找水过程中避开咸水层具有借鉴意义。
Compared with the center of Sichuan Basin,the red beds distributed in the southern margin of it are characterized by many geomorphological types,large topographic slopes,well-developed structures and steep dipping,and there are few reports on the development regularity of the saline water in the red beds.Through investigation,hydrogeological drilling,sampling analysis and testing,it is found that the development of salt water is mainly controlled by lithology and groundwater circulation.Soluble salt in red sandstone and mudstone is the material basis for the development of salt water.Salt water is more likely to develop in mudstone-bearing strata.Groundwater type,slope structure,depth and fault mainly affect the cycling conditions of groundwater.Fresh water is strongly developed in cycling alternation,while salt water is developed in slow cycling alternation.Salt water with complex composition in the deep part of the fault zone will well up due to exploitation of shallow groundwater,resulting in salinization of shallow groundwater.The study result has reference significance for avoiding saline water layer in the process of water exploration in red beds in the southern margin of Sichuan Basin.
作者
董建兴
孙东
魏良帅
张志鹏
黄瑞
杨海军
DONG Jianxing;SUN Dong;WEI Liangshuai;ZHANG Zhipeng;HUANG Rui;YANG Haijun(Chengdu Hydrogeology Survey&Engineering Geology Survey Center,Geology&Mineral Resources Exploration&Development Bureau of Sichuan Province,Chengdu 610081,Sichuan,China;Sichuan Huadi Environmental Science and Technology Co.,Ltd,Chengdu 610081,Sichuan,China;Institute of Exploration Technology,Chinese Academy of Geological Sciences,Chengdu 611734,Sichuan,China;Emergency Management Bureau of Rongxian,Rongxian 643100,Sichuan,China)
出处
《地质通报》
CAS
CSCD
北大核心
2021年第8期1394-1401,共8页
Geological Bulletin of China
基金
中国地质调查局项目《乌蒙山连片贫困缺水区15万水文地质调查项目(中国地质科学院探矿工艺研究所)》(编号:DD20160287)。
