长白山玄武岩区地热异常区遥感识别

利用Landsat TM5遥感影像多光谱和热红外数据,对长白山玄武岩区地表温度场进行了反演。在此基础上,综合分析了研究区地表温度场、温泉和地热井分布特征、布格重力场及磁场4个因子,采用判别分析方法建立并验证了判别函数,对研究区地热异常区进行了识别。研究结果表明:研究区地表温度异常区主要分布在长白山天池火山口周围,此外,在区内3个中生代沉积盆地(抚松盆地、松江盆地和长白盆地)也有孤立状的高温区域分布,地表温度异常像素所占比例为2.993%;研究区潜在地热资源异常区可分为环长白山天池火山口区域、松江河—抚松县及二道白河—松江镇一带的抚松盆地和松江盆区、仙人桥地区以及长白县—十四道沟一带的长白盆地区,其中环长白山天池火山口区域地热潜在概率值均大于0.9,最大值达到1.0。该研究为地热异常区的识别提供了一条新的思路。

Potential Geothermal Fields Remote Sensing Identification in Changbai Mountain Basalt Area

The surface temperature of Changbai Mountain basalt area was interpreted by using Landsat TM5 multispectral and infrared data,and the potential geothermal fields were identified by using discrimination analysis on the surface temperature,hot springs and geothermal well distribution,gravity,and magnetic fields.The results show that the surface temperature abnormal areas are mainly distributed around the Tianchi volcano area on Changbai Mountain and the three Mesozoic sedimentary basins (Fusong,Songjiang,and Changbai basins).The proportion of abnormal pixel in surface temperature is 2.993％.The potential geothermal fields in the study area are divided into four regions,including the area around Changbai Mountain Tianchi volcano,Songjianghe-Fusong County,Erdaobaihe-Songjiang Country (Fusong and Songjiang basins),and Xianrenqiao-Changbai County-Shisidaogou(Changbai basin).The probability of potential geothermal resources is greater than 0.9,and the maximum value is 1.0 in Changbai Mountain Tianchi volcano region.The study provides a new approach for potential geothermal field identification.