摘要
岩石圈热结构是了解大陆岩石圈构造变形及演化等大陆动力学问题的重要基础,更是地热田热源机理研究的核心问题,尤其对于深部地热资源开发具有重要的科学指导意义.沧县隆起中部地热资源丰富,地热地质条件较好,但该地区岩石圈热结构尚不明确,制约着区域地热资源勘查开发.本文以沧县隆起中部献县地热田为研究区,开展了4000 m深井测温、精细的岩土热物性测试,查明了该区大地热流特征及热结构特征,填补了大地热流测量空白区,建立了研究区岩石圈热结构概念模型,估算了其深部温度及岩石圈厚度.结果表明,献县地热田大地热流值为70.58 mW/m^(2),居里面埋深约为24 km,莫霍面温度约为749℃,热岩石圈厚度约为85~96 km.
Understanding the lithospheric thermal structure is an important basis for understanding the continental dynamics(i.e.,tectonic deformation and evolution)of the continental lithosphere.It is also the core of studies on the thermal source mechanisms of geothermal fields.Most importantly,it can provide scientific guidance for the exploration and development of deep geothermal resources.The Cangxian uplift enjoys rich geothermal resources and favorable geothermal geological conditions.However,its lithospheric thermal structure is still unclear,which restricts the exploration and development of regional geothermal resources.Focusing on the Xianxian geothermal field in the middle part of the Cangxian uplift through the temperature measurement of a 4000 m deep well and fine tests of geotechnical thermophysical properties,this study has ascertained the characteristics of the terrestrial heat flow and lithospheric thermal structure in the study area,thus filling the gap in terrestrial heat flow measurement.Moreover,this study has established a conceptual model of the lithospheric thermal structure of the study area and estimated the deep temperature and lithospheric thickness in the study area.The results show that the Xianxian geothermal field has a heat flow of 70.58 mW/m^(2),a burial depth of the Curie surface of about 24 km,a Moho temperature of about 749℃,and a lithospheric thickness of about 85-96 km.
作者
段和肖
刘彦广
王贵玲
边凯
牛小军
牛飞
胡静
Duan Hexiao;Liu Yanguang;Wang Guiling;Bian Kai;Niu Xiaojun;Niu Fei;Hu Jing(School of Earth Sciences and Engineering,Hebei University of Engineering,Handan 056000,China;Technology Innovation Center for Geothermal&Hot Dry Rock Exploration and Development,Ministry of Natural Resources,Shijiazhuang 050061,China;Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang 050061,China;Hydrogeological Team,Hebei Coalfield Geology Bureau,Handan 056000,China;School of Civil Engineering and Architecture,Jiangsu University of Science and Technology,Zhenjiang 212100,China)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2023年第3期988-1001,共14页
Earth Science
基金
河北省重点研发计划项目(No.20374201D)
自然资源部地热与干热岩勘查开发技术创新中心开放基金项目(No.SK202104)。
关键词
沧县隆起
献县地热田
大地热流
岩石圈热结构
地热能
Cangxian uplift
Xianxian geothermal field
terrestrial heat flow
lithospheric thermal structure
geothermal energy
作者简介
段和肖(1996-),男,硕士研究生,主要从事地热地质研究.ORCID:0000-0002-9030-5355.E-mail:1415282112@qq.com;通讯作者:刘彦广,E-mail:gaoyuanzhixing@163.com。
