广东阳江盆地遥感数据地温反演及地热异常靶区圈定

Inversion of ground temperature from remote sensing data and delineation of geothermal anomaly targets in Yangjiang Basin,Guangdong Province

地热能是一种安全、清洁、稳定的可再生能源,广东阳江地区的地热资源开发潜力巨大,但研究程度较低。热红外遥感技术能够高效地圈定地热异常区并对隐伏断裂进行预测,笔者等选取研究区landsat8遥感数据,通过分析地表温度、地热异常点及人类活动的关系,利用大气校正方法对该区潜在的地热异常进行了预测。在排除人为热影响下得到高温地热异常区9处,排除湖泊水域以及海拔的影响下得到低温地热异常区4处。在此基础上,利用地表温度与归一化植被指数计算研究区的温度植被干旱指数值(TVDI),预测可能存在的隐伏断裂23处。最后结合岩性、断裂构造有效地圈定了5处地热靶区,主要分布在研究区西南区域和新洲镇附近。研究结果有助于预测阳江地区具有开发前景的地热异常区、识别圈定具有勘探意义的靶区以及预测隐伏断裂,对该区后续地热资源的进一步研究具有重要的意义。

Geothermal energy is a safe,clean and stable source of renewable energy.The Yangjiang area of Guangdong Province has great potential for the exploitation of geothermal resources,but the related study is not sufficient..Thermal infrared remote sensing technology can effectively delineate geothermal anomaly areas and predict buried faults.In this paper,based on Landsat 8 remote sensing data,we analyzed the relationship between ground temperature,geothermal anomalies and human activities.Meanwhile,atmospheric correction method was used to predict potential geothermal anomalies in the study area.As a result,9 high-temperature geothermal anomaly areas are obtained without the influence of anthropogenic heat,and 4 low-temperature geothermal anomaly areas are obtained without the influence of lake water and altitude.On this basis,the temperature and vegetation drought index of the study area was calculated by using land surface temperature normalized vegetation index,and23 potential buried faults were predicted.Finally,combined with lithology and fault structure,five geothermal target areas were effectively delineated,which were mainly distributed in the southwest of the study area and near Xinzhou Town.The research results are helpful for predicting geothermal anomaly areas of development prospects,identifying and delineating target areas and predicting concealed faults in Yangjiang area,which is very significance for the further study of geothermal resources in this area.