沉积与特提斯地质2025，Vol.45Issue(4)：806-818,13.DOI:10.19826/j.cnki.1009-3850.2025.11009
阳原地热区三维电性结构及热成因模式研究
Three-dimensional electrical structure and thermal genesis model of the Yangyuan geothermal area:Insights from magnetotelluric geophysical investigations
摘要
Abstract
The Yangyuan Basin is one of the key geothermal resource enrichment zones in China,with substantial potential for geothermal 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 to uncertainties 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 sounding sites 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 in the Yangyuan Basin was identified as a convective geothermal system.The deep-seated heat source is attributed to the upwelling of mantle-derived thermal fluids associated with magmatic activity.Fault zones within the basin serve as favorable channels for thermal fluid migration,while the overlying Quaternary unconsolidated sediments act as an effective thermal caprock.The primary thermal reservoir is hosted within the karst-fracture system of the Jixian–Changcheng dolomitic carbonate formations.关键词
地热资源/大地电磁法/三维反演/电性结构/阳原Key words
geothermal resources/magnetotelluric method/3D inversion/electrical resistivity structure/Yangyuan Basin分类
天文与地球科学引用本文复制引用
杨云涛,甄彦敏,周文龙,刘俊佟,胡祥云..阳原地热区三维电性结构及热成因模式研究[J].沉积与特提斯地质,2025,45(4):806-818,13.基金项目
国家自然科学基金项目(42220104002) （42220104002）
