湖北省黄陵断穹南东缘地下热水赋存条件与特征及其成矿模式研究

Study on Occurrence Conditions,Characteristics and Metallogenic Model of Geothermal Water in the Southeastern Margin of Huangling Fault,Hubei Province

黄陵断穹南东缘地下热水主要赋存于寒武系,次为奥陶系地层中,上覆盖层为志留系及白垩系砂页岩。热储有两种类型,即一是带状热储,成矿模式为大气降水和地表水垂直入渗补给-深部热源加温-热循环对流供热;另一种为层状热储,成矿模式为大气降水及地表水入渗补给-侧向径流-大地热流传导供热。两种热储大多共生产出,因所处地段不同而主次有异,北部以带状热储为主,层状热储次之;中部以层状热储为主,带状热储次之。区内长江左岸-雾渡河断裂之间,探采结合井单井抽水量为500~1200 m^3/d,北部水化学类型为SO4、HCO3-Ca、Mg型,中部为SO4、CL-Ca、Mg、Na型。水质均达到中国现行理疗热矿水的水质标准,具有广阔的开发利用前景。

The underground hot water in the southeastern margin of Huangling fault is mainly found in the Cambrian strata,followed by the Ordovician strata,and the upper cover is the Silurian and Cretaceous.There are two types of heat storage.One is strip heat storage.The metallogenic model is atmospheric precipitation and vertical infiltration replenishment of surface water-deep heat source heating-heat cycle convection heating;the other is layered heat storage.Metallogenic model is atmospheric precipitation and surface water infiltration recharge-lateral runoff-geothermal flow conduction heating.Most of the two types of heat storage are produced together,and the primary and secondary are different depending on the location:the northern part is mainly composed of strip-shaped heat storage,and the layered heat storage is the second;the middle part is dominated by layered heat storage,and the strip is stored in heat.Between the left bank of the Yangtze River and the Wuduhe fault,the combined extraction and single well pumping capacity is 500~1200 m^3/d,the northern water chemical type is SO4,HCO3-Ca,Mg type,and the central part is SO4,CL-Ca,Mg,Na type.The water quality has reached the water quality standard of the current physiotherapy hot mineral water in China,and has broad prospects for development and utilization.