基于遥感技术的腾冲地热异常区识别

Application of remote sensing technique to the identification of geothermal anomaly in Tengchong area,southwest China

重点探讨用遥感技术识别腾冲火山地热区的地表热异常。考察地表温度的概率分布,提出了基于统计方法来识别地表温度异常区的思路。同时,采用按高程信息来分区识别地表温度异常区,以减小腾冲地区高程对地表温度分布的影响,并结合遥感地质构造解译和蚀变岩体遥感填图结果,圈定腾冲地区地热异常区的空间分布情况。共发现8处地热异常区,其中3处是本次研究识别出来的。与有关地热田、热泉、火山的分布资料的对比分析,结果显示所圈定的地热异常区是较合理的。腾冲地热异常区的空间分布明显受到区内地质构造控制,并跟地表高温异常和岩体蚀变等遥感反演信息有密切的联系。

Geothermal anomaly in the Tengchong volcanic-geothermal area of southwest China is studied by means of remote sensing technique with application of probability distribution theories to the identification of land surface temperature （LST） anomaly. The LST anomaly in the areas is delineated with the help of elevation information and the spatial distribution of geothermal anomaly is determined according to the combined information of LST anomaly, geologic structure, and hydrothermally altered rocks. A total of eight geothermal anomalies are recognized, in which three of them are identified by this study. Assessments show that the final results are rational in comparison with other geothermal fields, hot springs, and volcanoes documented in references. It suggests that the spatial distribution of geothermal anomaly in Tengchong area is controlled by geological structures, and related closely to remote sensing retrieval information of the surface high temperature anomalies and the surrounding alterated rocks.