伽马能谱测量和米测温在地热调查中的应用

介绍了伽马射性脉冲计数和米测温的工作原理,总结了已知温泉附近伽马射性脉冲计数和米测温特点:张性断层上方具有较高的伽马射线脉冲计数;在脉冲计数最大测点做伽马能谱测量得出该地铀元素含量较高;米温结果显示该地具有较高的热背景值.依据上述特征,在同一断层的另一泉水出露地区,开展了伽马射线脉冲计数和米测温工作,但伽马射线脉冲计数较小,米测温没有发现有利的地热背景值.泉水化学分析表明,未知区泉水来自浅地表水.地表露头也显示该处断裂后期改造强烈,且形成长达300 m的压性断裂带,不宜形成储热构造.

THE APPLICATION OF GAMMA-RAY SPECTRUM AND ONE-METER GROUND TEMPERATURE SURVEY TO GEOTHERMAL SURVEY

The study of characteristics of gamma-ray counts and one-meter ground temperature survey over the known hot-springs aimed to search for new hot-springs in unknown areas. The principles of gamma-ray count survey and one-meter ground temperature survey are dealt with in this paper. Some conclusions have been reached. Over the extensional fault, the gamma-ray counts are relatively high and the gamma-ray spectrum contains abundant uranium element. The data of one-meter ground temperature survey shows relatively high geothermal background value over the known hot-spring. Therefore, detailed field survey was conducted near the unknown area belonging to the same geo-structure. Nevertheless, the gamma-ray count is lower and the geothermal background value is well-balanced too. Chemical analyses reveal the spring water roots in shallow ground water. The fault zone has been strongly rebuilt, with a length of about 300 m at the outcrop, and this area is not suitable for the formation of heat reservoir structure.