摘要
阜平县太古界变质岩经历了多期变质深熔作用,以揉塑性片麻岩为主,地层致密柔韧,富水性差,找水难度较大。在地质调查、物探勘探及钻探验证相结合的基础上,较系统地分析了变质岩区构造裂隙水、风化壳裂隙-孔隙水、层状裂隙水和接触型基岩裂隙水四种地下水类型的赋存规律及电性特征。结果表明:构造裂隙水主要赋存在构造破碎带内;风化壳裂隙-孔隙水分布普遍,水量小,一般沟谷风化壳与断裂叠加带富水性较大;层状裂隙水和接触型基岩裂隙水主要赋存在硬脆-软塑岩性组合的接触带(面)上。在视电阻率等值线断面上,构造裂隙水呈现为陡降低阻带曲线;与构造复合的风化壳裂隙-孔隙水,呈现为凹型低阻曲线;层状裂隙水面状分布,呈现为水平低阻曲线;岩脉接触型基岩裂隙水,呈现为条带状高阻+类断层低阻反映。
The Archean metamorphic rock in Fuping County has undergone multiple stages of metamorphosed deep-melting,mainly composed of plutonium-rich gneiss.The stratum is dense and flexible,and it is very difficult to find water because it contains a small amount of groundwater.Based on the combination of geological survey,geophysical exploration and drilling verification,this work systematically analyzed the regularity and electrical characteristics of the four types of groundwater,including structural fissure water in the metamorphic rock area,fissures in the weathering crust,pore water,layered fissure water,and contact-type bedrock fissure water.The results show that the structural fissure water was mainly distributed in the structural fracture zone.The fissure-porosity water in the weathering crust was widely distributed but the water volume was small.The water richness of the weathered crust and fracture zone in the valley was generally larger,the layered fissure water and the contact bedrock Fracture water was predominantly present on the contact zone of a hard brittle-soft rock combination.In the apparent resistivity section,the structural fissure water presented a steep reduction stopband,and the composite weathercock fissure-porosity water presented a concave low-resistance curve.Layered fissure water surface distribution showing a horizontal low resistance curve.Bedrock fissure water contacted with the veins presented as strip-shaped high resistance+type fault low resistance reflection.
作者
刘伟朋
卢放
韩振
孟顺祥
龚冀丛
LIU Weipeng;LU Fang;HAN Zhen;MENG Shunxiang;GONG Jicong(Center for Hydrogeology and Environmental Geology Survey,Baoding 071051,China)
出处
《南水北调与水利科技》
CAS
北大核心
2019年第6期170-177,共8页
South-to-North Water Transfers and Water Science & Technology
基金
自然资源部地质大调查项目(DD20160232
DD20160240)~~
关键词
变质岩
地下水类型
赋存规律
电性特征
metamorphic rock
types of groundwater
storage rules
electrical characteristics
