Application of thermal infrared remote sensing technology in geothermal resource survey in Jinzhai County, Anhui Province
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摘要:
利用热红外遥感技术进行地热异常信息的提取可以为地热资源调查提供重要的依据.在充分掌握金寨县区域地质背景的基础上, 采用Landsat 8热红外TIRS10波段数据通过大气校正法进行地表温度反演, 采用高分一号和高分二号数据进行线环构造遥感解译, 再将遥感反演的地表温度、解译的线环构造和其他地质条件、已知地热资料进行综合分析, 建立地热异常区圈定依据, 圈定地热异常区, 并结合相关判定因子剔除假异常.最终在研究区共圈定7个潜在地热异常区, 为下一步地热资源实地调查提供先导支持.
Abstract:The extraction of geothermal anomaly information with thermal infrared remote sensing technology can provide important basis for geothermal resource survey. Based on the regional geological background of Jinzhai County, the Landsat 8 TIRS10 band data are adopted for surface temperature inversion by atmospheric correction method, and the GF-1 and GF-2 data for remote sensing interpretation of linear and ring structures. Then, the surface temperature obtained from remote sensing inversion, interpreted linear and ring structures, and other geological conditions as well as the known geothermal data are comprehensively analyzed to delineate geothermal anomaly areas and eliminate false anomalies in combination with relevant judgment factors. Finally, a total of 7 potential geothermal anomaly areas are recognized in the study area, providing a guiding support for the next field survey of geothermal resources.
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表 1 遥感数据源信息
Table 1. Information of remote sensing data source
产品名称 空间分辨率/m 获取时间 云量/% 主要用途 Landsat 8 15 2015-01-03 0.91 地表温度反演 GF-1 2 2020-04—2020-10 < 2 线环构造解译 GF-2 0.8 2020-01—2020-09 < 1 线环构造解译 
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表 2 研究区地表温度热异常区判定表
Table 2. Determination of surface thermal anomaly areas in the study area
编号 范围 判定结果 特征 Q1 白塔畈与梅山镇交界部位 地热异常区 地表温度异常明显，范围较大，为非城镇区域，异常分布均匀，不受地形影响，且构造发育密集 Q 2 汤家汇镇北部尧铁冲乡西北部 地热异常区 地表温度异常明显，分布较广，局部受地形影响阴阳坡温度差异较大，其余部分分布较均匀，且处于金寨断裂与金刚台断裂的交汇处 Q 3 桃岭乡西北部 地热异常区 地表温度异常明显，分布均匀，临近金寨大断裂，且各方向小断裂发育 Q 4 汤家汇镇南侧及关庙乡北侧 地热异常区 地表温度异常分布不均，范围较大，金刚台断裂穿插其中，影像上局部线性构造明显，且两侧都有异常分布 Q 5 吴家店镇东部及花石乡西侧，果子园东侧小部分地区 地热异常区 地表温度异常明显，局部分布不均，阳坡和阴坡都存在异常，断裂构造呈格状发育，局部发生位移，区域内有西庄温泉一处 Q 6 燕子河镇西部 伪地热异常区 阳坡地温异常分布范围明显比阴坡大，且温度差异较大，线性构造发育不明显，认为地温异常为太阳辐射造成的 Q 7 燕子河东部分布最广，其次为天堂寨和长岭乡北部 地热异常区 断裂构造较为发育，延伸较长，地温异常分布多数不受地形影响，阴阳坡均有高温异常，也较为集中
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