冀东燕山中段地热地质条件分析与资源潜力评价

Analysis of geothermal conditions and resource potential in the middle segment of Yanshan Mountains,eastern Hebei Province

该文综合了地质路线调查、机民井(地热井)地温测量、水化学分析、物探剖面测量等工作成果,对冀东燕山中段的地热地质条件进行了分析,对区内地热资源潜力进行了初步评价,并对下一步工作提出了建议。冀东燕山中段地热异常区主要分布在肖营子岩体边部,地热流体的分布、运移和储存受断裂控制;热储岩性为片麻岩或花岗岩,基本无盖层。热储深度3000~3200 m,温度105~110℃,热水形成时间12.3~27.8a。地下流体化学成分主要受肖营子岩体影响。热量来自于地壳深部。活动性深大断裂及其次级构造交汇部位、背斜核部、高热导率且具有一定延深的岩体或隐伏岩体与低热导率地层接触带附近、区域地下水排泄区等为山区地热形成有利地段。通过估算,研究区内各地热异常区地下热水总可开采量为207.03×104m3/a,其产生的能量为21.59×1010kJ/a,相当于7367.59 t标煤或5156.29 t石油产生的能量。为今后研究区内地热能勘查、开发利用规划、采矿权设置等提供了技术支持。

This paper analyzes the geothermal geological conditions,the potential of geothermal resources in the area is prelimi⁃narily evaluated and suggestions for further work are put forward in the middle segment of Yanshan Mountains by synthesizing the results of geological route survey,domestic water well(geothermal well)ground temperature measurement,hydrochemical analysis,and geo⁃physical profile measurement.According to this study:the geothermal anomaly zone in the middle segment of Yanshan Mountains is mainly distributed on the edge of the Xiaoyingzi rock mass,and the distribution,migration and storage of geothermal fluids are con⁃trolled by the fault structure.Thermal storage lithology is gneiss or granite,basically without cap rock.The depth of thermal storage is 3000 to 3200 m,the temperature is 105 to 110℃,and the hot fluid formation time is 12.3 to 27.8 annual.The chemical composition of the underground fluid is mainly affected by the Xiaoyingzi rock mass and the heat came from the deep crust.Active deep faults and their secondary structural intersections,anticline cores,high thermal conductivity and some depth of rock or hidden rock masses and low thermal conductivity strata contact zone,regional groundwater discharge area,etc.are themountain geothermal favorable location.By estimation,the total recoverable amount of underground hot water in the thermal anomaly areas in the study area is 207.03×104 m3/a,and the energy generated is 21.59×1010kJ/a,which is equivalent to the energy generated by 7367.59t standard coal or 5156.29t pe⁃troleum.It provides favorable technical support for geothermal energy exploration,development and utilization planning and mining right setting in the future.