基于GIS信息量模型的地热潜力区评价研究——以云南腾冲地区为例  

GIS BASED INFORMATION MODEL FOR ASSESSMENT OF GEOTHERMAL POTENTIAL:CASE STUDY OF TENGCHONG COUNTY,SOUTHWEST CHINA

作　　者：李建明[1] 张延军[1] LI Jianming ;ZHANG Yanjun(College of Construction Engineering,Jilin University,Changchun 130026)

机构地区：[1]吉林大学建设工程学院,长春130026

出　　处：《工程地质学报》2018年第2期540-550,共11页Journal of Engineering Geology

基　　金：国家高技术研究发展计划(2012AA052801);中国国家自然科学基金会(41372239);高等学校博士学科点专项科研基金(20110061110055)资助

摘　　要：一个准确的地热潜力评价模型有助于降低开发风险和减少投入。基于GIS平台,文章通过量化地热分布与周围控制因素的空间关系,构建信息量模型对云南腾冲地热潜力区进行评价。应用的公开数据包括地震震中数据、断层分布、布格重力数据、Landsat7 ETM+影像、航磁数据和SRTM高程影像;分别转换为古登堡-李斯特"b"值图、到断层距离图、到主地堑距离图、地表温度图、磁异常图和水系分布图。在构建数学预测过程中,提出结合信息量值的因子分析法检验影响因子独立性问题,保证评价可靠性。指数分析和面积比分析结果表明,信息量模型能够很好地应用于地热潜力区评价。预测出尚未开发且面积较大的地热潜在区4处,分布于龙川江流域、南底河流域和怒江流域;统计出未开发地热田总面积为1835.6 km2,占整个研究区的6.72%。本研究可以为缺乏调查信息区域初步确定地热潜力区,降低经济风险。An accurate assessment model for geothermal potential regions can help to lower the risk of the development and to reduce the investment.Based on the platforms of GIS,the promising geothermal areas are identified through the information value model according to the relationship between geothermal occurrences and their controlling factors in Tengchong county,China.Publicly available databases for this analysis include epicenters,distribution of faults,Bouguer gravity,Landsat7 Enhanced Thematic Mapper Plus(ETM+)images,the magnetic data,and digital elevation model(DEM)data.They are extracted as the b-value map,distance to faults map,distance to main grabens map,LST(land surface temperature)map,magnetic anomaly map,and distance to rivers map respectively.To ensure the model is suitable to evaluate the geothermal potential sites within the region,the method of factor analysis based on information values is applied to test the conditional independence.The results of index analysis and area ratio analysis indicate that the information value model can be applied well in the evaluation of geothermal potential regions.Four potential areas in final map,of which have not been explored or exploited,are located in Longchuan River,Nandi River and Nu River.Furthermore,the total area of unexplored geothermal potential field is 1835.6 km 2,accounting for 6.72%of study area.It is expected that the study can guide further preliminary investigations performed for large areas having limited information and can lower the risk in economy.

关 键 词：地热异常 信息量模型 因子分析 

分 类 号：P314.9[天文地球—固体地球物理学]