摘要
蔚县盆地属于断陷盆地型层状热储低温地热田。中元古界长城系—蓟县系为热储层,上地幔传导热为主要热源。盖层主要由第四系和侏罗系构成,寒武系—奥陶系也起到了盖层的作用。以阳原南山断层和蔚县南山断层为南、北边界的蔚县地块呈一总体倾向SE的单斜构造,蓟县系等地层埋藏深度由北西向南东逐渐加深。盆地北部山区出露的长城系—蓟县系接受大气降水后,顺层向深部运移,运移过程中不断有沿破碎带、裂隙垂直下渗的相邻含水层水补给。蔚县南山断层阻断地下水继续向南运移的路径。经过深循环并被上地幔传导热加热后的地下水封闭或半封闭于长城系—蓟县系中形成层状热储。热储层埋藏深度较大的壶流河以南地区,特别是大型断层附近,以及松枝口—右所堡等张性大断层与阳原南山断层、蔚县南山断层等NE向阻水大断层的交汇部位,如三马坊、北洗冀、麦子疃东等地带,次级断裂构造较发育,岩石破碎,利于地热流体的存储和运移,应作为今后地热资源勘查和开发利用的重点区域。
The geothermal field in Yuxian area belongs to the type of faulted basin, which is a low-temperature geothermal field that is dominated by layered thermal reservoir. The heat source mainly comes from the heat transfer of upper mantle. The thermal reservoir is in the Mesoproterozoic Jixian System—Changcheng System, and the cap rock is mainly composed of Quaternary and Jurassic system. The Cambrian—Ordovician System also plays a role of cap rock. The Yuxian block, with Yangyuan Nanshan fault and Yuxian Nanshan fault as the south and north boundaries, presents a monoclinic structure with a general trend of southeast, and the burial depth of the Jixian System and the Changcheng System gradually deepens from north to south. The Changcheng System and Jixian System exposed in the northern mountain area of the basin received the atmospheric precipitation, and the water migrated to the deep along the layer. In the process of migration, there is water supply from the adjacent aquifers which infiltrate vertically along the fracture zone and fracture. The Yuxian Nanshan fault blocked the further migration path of groundwater to the south. With the increase of buried depth, the groundwater is heated by the natural heating of the upper mantle heat source, and the groundwater is sealed or semi-sealed in the Changcheng System and the Jixian System to form conductive geothermal system. There are many secondary faults and fractures in the deep buried large faults and in the intersection of large faults which is conducive to the storage and migration of geothermal fluids. The south area of Huliuhe River, Sanmafang, Beixiji, the east area of Maimaituan,etc. have the above conditions and should be regarded as key areas for future exploration and development of geothermal resources.
作者
李泓泉
张树胜
谢明忠
周江
周建飞
贾立新
郝星波
任建帅
刘永平
于丹丹
LI Hongquan;ZHANG Shusheng;XIE Mingzhong;ZHOU Jiang;ZHOU Jianfei;JIA Lixin;HAO Xingbo;REN Jianshuai;LIU Yongping;YU Dandan(The Fourth Geological Team,Hebei Provincial Bureau of Coal Geology,Xuanhua,Hebei,075100;Environmental Gelolgical Survey Institute,Hebei Provincial Bureau of Coal Geology,Shijiazhuang,050085)
出处
《地质论评》
CAS
CSCD
北大核心
2020年第4期919-932,共14页
Geological Review
关键词
中元古界长城系-蓟县系
层状热储
低温地热田
蔚县盆地
Changcheng System
Jixian System
conductive geothermal system
low-temperature geothermal field
Yuxian Basin
