摘要
阳原盆地是我国地热资源的重要富集区之一,具备良好的开发利用前景。但阳原以往的地热地质研究多以区域性地质调查为主,探测深度有限,缺乏对地热系统的综合认识,导致地热系统刻画不清,从而制约了该区地热资源的高效开发与利用。为研究阳原地热区地热系统的精细化分布及其成因模式,本文在研究区布设7条大地电磁测线,共采集74个测点数据,维性分析结果显示出研究区深部地质结构具有三维电性特征,依据三维反演结果构建了研究区“浅部低阻—中部高阻—深部低阻”的三维电性结构模型,结合地热地质资料及测井数据确定了阳原地热区地热系统类型为对流型地热系统。地热系统的深部热源为岩浆活动引起的深部地幔热流物质上涌,区内断裂构造为热流体迁移提供了有利通道,第四系松散沉积层作为盖层具有良好的封闭保温作用,热储类型主要为蓟县—长城系岩溶裂隙热储。
The Yangyuan Basin is one of the key geothermal resource enrichment zones in China,with substantial potential forgeothermal exploitation.However,previous geothermal geological investigations in the region have primarily focused on regional-scale surveys with limited exploration depth,lacking a systematic understanding of the geothermal system.This has led touncertainties in delineating the geothermal system,thereby constraining the efficient development and utilization of local resources.To address these challenges,seven magnetotelluric(MT)profiles were deployed across the study area,and data from 74 soundingsites were collected.Dimensionality analysis indicated that the subsurface geological structure exhibits three-dimensional(3D)electrical anisotropy.Based on the 3D inversion results,a resistivity model of"shallow low-resistivity-intermediate high-resistivity-deep low-resistivity"was constructed.Integrating geothermal geological and well-logging data,the geothermal system inthe Yangyuan Basin was identified as a convective geothermal system.The deep-seated heat source is attributed to the upwelling ofmantle-derived thermal fluids associated with magmatic activity.Fault zones within the basin serve as favorable channels for thermalfluid migration,while the overlying Quaternary unconsolidated sediments act as an effective thermal caprock.The primary thermalreservoir is hosted within the karst-fracture system of the Jixian-Changcheng dolomitic carbonate formations.
作者
杨云涛
甄彦敏
周文龙
刘俊佟
胡祥云
YANG Yuntao;ZHEN Yanmin;ZHOU Wenlong;LIU Juntong;HU Xiangyun(School of Sustainable Energy,China University of Geosciences(Wuhan),Wuhan 430078,China;Hebei Geological andMineral Group Co.,Ltd.,Shijiazhuang 050020,China;Tianjin-Hebei Resource and Environmental Carrying CapacityEvaluation and Ecological Restoration Technologies Innovation Center,Shijiazhuang 050000,China;Key Laboratory ofCarrying Capacity Assessment and Planning for Resource and Environment,Beijing 101100,China;Center for Science inGeotechnical Engineering Infrastructure,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;School of Geophysics and Geomatics,China University of Geosciences(Wuhan),Wuhan 430074,China)
出处
《沉积与特提斯地质》
北大核心
2025年第4期806-818,共13页
Sedimentary Geology and Tethyan Geology
基金
国家自然科学基金项目(42220104002)。
关键词
地热资源
大地电磁法
三维反演
电性结构
阳原
geothermal resources
magnetotelluric method
3D inversion
electrical resistivity structure
Yangyuan Basin
