物探与化探2025，Vol.49Issue(3)：559-568,10.DOI:10.11720/wtyht.2025.1501
基于大地电磁的南宫地热田地热资源赋存特征
Exploring the occurrence characteristics of geothermal resources in the Nangong geothermal field based on the magnetotelluric method
摘要
Abstract
To clarify the occurrence characteristics of geothermal resources in the Nangong geothermal field,this study revealed the sub-surface strata and structures in the geothermal field using the magnetotelluric(MT)method in combination with drilling and geologic da-ta.Furthermore,this study systematically analyzed the distributions of shallow and deep geothermal resources and elucidated the heat source mechanisms.Finally,this study constructed the geological model of the Nangong geothermal field.The results show that within a depth of 4000 m,the strata in the Nangong geothermal field comprise the Quaternary,Neogene,Paleogene,Permian,Carboniferous,Or-dovician,and Cambrian strata from top to bottom.On the east side of the urban area of Nangong City,there are two concealed NE-tren-ding normal faults(i.e.,F1 and F2),exhibiting a NW dip direction and steep dip angles.The fault-affected zone displays well-devel-oped tectonic fractures and high water abundance.The Nangong geothermal field presents a dual geothermal reservoir system,comprising shallow porous sandstone reservoirs in the Neogene Minghuazhen(lower portion)and Guantao formations,and deep fissured-karstic bed-rock reservoirs in the Paleozoic Cambrian-Ordovician strata.These reservoirs host significant geothermal resources in the Nangong area.The Nangong geothermal field belongs to a heat conduction-type geothermal system within a sedimentary basin.Specifically,the heat of shallow geothermal reservoirs(temperatures:30℃to 63℃)is sourced from the vertical conduction of regionally high terrestrial heat flow,whereas the heat of deep geothermal reservoirs(temperatures:60℃to 78℃)originates primarily from hydrothermal convection ascending through tectonic fractures along F1 and F2,and heat transfer from surrounding rocks.The geological model for geothermal res-ervoirs constructed in this study demonstrates that the deep fissured-karstic bedrock reservoirs in the Nangong geothermal field are char-acterized by high connectivity,deep circulation,considerable thickness,extensive karst fissure development,and high permeability.Therefore,deep geothermal reservoirs in the karst fissure zone along F2 are recommended for prioritized exploitation.关键词
南宫地热田/大地电磁法/热储/地质模型Key words
Nangong geothermal field/magnetotelluric method/geothermal reservoir/geological model分类
天文与地球科学引用本文复制引用
卢星辰,邢倩,许勇,吕国森,陈祥忠,王瑞兴,黄申硕..基于大地电磁的南宫地热田地热资源赋存特征[J].物探与化探,2025,49(3):559-568,10.基金项目
中国石化集团新星石油有限责任公司项目"南宫地区地热资源赋存特征及地热成因研究"(10500000-24-ZC0607-0001) （10500000-24-ZC0607-0001）
国家青年科学基金项目"雄安新区容城地热田深部热流体循环与演变机制"(41902310) （41902310）
矿冶科技集团有限公司"揭榜挂帅"科研基金项目(JTKY202427822) （JTKY202427822）
