毕节市金沙县安底热矿水赋存特征及成因分析

On Occurrence and Genesis of Hot Mineral Water in Andi, Jinsha, Bijie, Guizhou

毕节市金沙县安底镇位于安底穹隆轴部,在收集区域地质、水文地质、地球物理勘探及地热井资料基础上,通过综合研究,分析了金沙县安底地区地热资源的形成背景、热储构造、赋存特征及热矿水成因。区内热储构造为安底穹隆,导热构造为龙井坝断层,属典型的"褶皱隆起断裂对流型"地热系统,大气降水沿北西、南东侧安底穹隆背斜翼部碳酸盐岩分布区断裂、构造裂隙,由北西、南东向背斜轴部进行深循环,地下水向深部下渗赋存于震旦系灯影组白云岩中,不断与地壳地温梯度场热的交换,形成热矿水。

Andi Town,Jinsha County,Bijie City is located at the axis of the Andi dome.The distribution of geothermal resources in Andi Town is controlled by the dome structure.This paper deals with geological background,thermal reservoir structure,occurrence and origin of hot ore water in Andi Town on the basis of data on regional geology,hydrogeology,geophysical exploration and geothermal wells.The thermal reservoir aquifer is dolomitite of the Sinian Dengying Formation.The thermal reservoir structure is the Andi dome and thermal conductivity structure is Longjingba fault.It is a typical"fold uplift and fracture convection type"geothermal system.The meteoric water permeating into deep dolomitite of the Sinian Dengying Formation along the fault becomes hot mineral water by means of heat exchange with crustal temperature gradient field.