| 王辉,赵冠华,李活英,周立坚,韦红,卢安康.广西煤盆地隐伏地热成因模型及找矿靶区圈定[J].地质找矿论丛,2025,40(2):150-157 |
| 广西煤盆地隐伏地热成因模型及找矿靶区圈定 |
| Genetic model of concealed geothermal resources and the prospecting target delineation in Guangxi coal basins |
| 投稿时间：2025-03-03 修订日期：2025-04-23 |
| DOI：10.6053/j.issn.1001-1412.2025.02.002 |
| 中文关键词: 隐伏地热 成因模型 找矿靶区圈定 广西煤盆地 |
| 英文关键词:concealed geothermal resources genetic model delineation of geothermal prospecting target coal basins in Guangxi Zhuang Autonomous Region |
| 基金项目:广西自然科学基金面上项目(编号:2022GXNSFA035576、2024GXNSFAA999213)和中国煤炭地质总局重大科技专项"揭榜挂帅"项目(编号:ZMKJ-2023-JBGS02-03)联合资助。 |
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| 中文摘要: |
| 为了系统地总结广西煤盆地隐伏地热成矿模型,圈定找矿靶区,基于资料收集与研究分析,运用地热赋存理论,综合探讨广西煤盆地隐伏地热的生、储、盖、运、聚等条件,提出广西煤盆地隐伏地热成因模型为:传导型地热热源主要是上地幔生热及地壳深部放射性生热,对流型地热热源为全新世孕震构造产生的摩擦生热与深部导热;水源主要来自于大气降水,广西煤盆地汇水面积大,易接受周边山区降水补给;热储以砂岩、砂砾岩孔隙型热储和以灰岩岩溶裂隙型热储为主,具有导水能力的断裂破碎带也具备良好储层条件;热储盖层一般为泥岩、泥页岩、泥灰岩等,有利于热量保存;热流体运移有断裂构造通道和地层层间孔裂隙两种类型及叠加混合,热流体聚集主要发育于向斜构造。其地热成矿模型为:以地质构造分析为基础,区域NW向断裂为主导热构造,NE、NNE向断裂为次要导热构造,两组构造交汇区域为地热形成有利靶区,断陷、坳陷盆地内砂岩、砂砾岩和灰岩为有利储层。 |
| 英文摘要: |
| Based on data collected and analysis,according to the geothermal occurrence theory,the data genetic model and delineation of concealed geothermal resources in coal basins in Guangxi Zhuang Autonomous Region are summarized,and conditions of generation,storage,migration,cover and accumulation are comprehensively discussed.A conclusion about the genetic model is drawn that heat of conductive geothermal water is derived from the mantle and radioactive heat from the deep crust,while that of convective geothermal water comes from friction of Holocene seismogenic structural movement.Water of the geothermal fluid is mainly derived from meteoric water.The basins generally have large catchment area and tend to receive precipitation from the surroundings.Geothermal reservoirs occur mainly in sandstone,porous sandy conglomerate,and karst fractured limestone.The cataclastic fracture zone is a condition of heat reservoir.Mudstone,mudy shale and marl are the cover rocks.Geothermal fluid migrate along fractures and interformational porous fractures,and conduit of overprint of the two fractures.The heat fluid is mainly accumulated in synclines.In addition to the above geological analysis shows that NW fracture is the main heat conductive structure,followed by the NE and NNE fractures.Intersections of the two sets of fractures are the favorite targets.Sandstone,sandy conglomerate and limestone in fault basin and depression basin are the favorite reservoirs. |
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