湖北省干热岩地热资源赋存条件及远景分析

Analysis on the Occurrence Condition and Prospect of Hot Dry Rock Geothermal Resources in Hubei Province

“缺煤、少油、乏气”是湖北省能源的基本特点,能源供需压力较为紧张。干热岩作为地热资源的重要组成部分,具有清洁、稳定、可再生的能源优势。但湖北省干热岩研究较为滞后,研究基础薄弱。基于湖北省区域地温场特征、热源条件、热传导通道以及储盖特征的分析,初步认为湖北省东部大别山罗田地区和江汉盆地沔阳凹陷东南部嘉鱼地区具有干热岩成藏条件,并通过对区内大地热流特征、地表地热显示、地温梯度异常、莫霍面和居里面埋深、断裂构造、(隐伏)酸性岩体以及盖层分布等干热岩赋存条件的综合分析,结合已有元素地球化学、水化学以及物探资料,提出了湖北省罗田地区和嘉鱼地区分别具有高放射性产热型和沉积盆地型干热岩成因模式,可作为干热岩远景区,为下一步开展干热岩地热资源调查与评价提供依据。

“Lack of coal,less oil,and lack of gas”are the basic characteristics of Hubei’s energy resources,and the pressure on energy supply and demand is relatively tight.As an important part of geothermal resources,Hot Dry Rock(HDR)resources have advantages of being clean,stable and renewable.However,the research on HDR in Hubei Province is lagging behind,and the research foundation is weak.Based on the analysis of the characteristics of regional geothermal field,heat resource condition,heat conduction channel and reservoir and seal characteristics in Hubei Province,it is preliminarily considered that there are HDR reservoir forming conditions in Luotian area of eastern Dabie and Jiayu area of southeast Mianyang depression of Jianghan Basin.Based on the comprehensive analysis of terrestrial heat flow characteristics,surface geothermal manifestation,geothermal gradient anomaly,Moho surface and Curie surface,fault structure,distribution of(concealed)acidic rock mass and caprock,and other HDR occurrence conditions,combined with the existing element geochemistry,hydrochemistry and geophysical prospecting data,this paper proposes that Luotian area and Jiayu area respectively have the genetic model of high radioactive heat production type and sedimentary basin type of HDR,which can be used as HDR prospect areas and provide reference and basis for the future investigation and evaluation of hot dry rock geothermal resources.