土壤氡测量技术在新疆塔什库尔干县地热资源勘查中的应用

土壤氡测量技术是地热地质勘查的一种有效方法,目的是确定隐伏断层和地热流体富集部位。本次笔者在研究区进行了点状网度控制和剖面线状追索两种方法的土壤氡测量工作,野外共采集1904组数据。根据松散堆积地层物质来源的不同,对数据采用了分区和分段处理方法,发现区内不同地层土壤氡值背景有很大差异:变质岩碎屑堆积背景值为392.1 Bq/m3,花岗岩碎屑堆积为1930.2 Bq/m3,正长岩和花岗岩混杂堆积为1571.1 Bq/m3。统计了数据的离散程度,确定了异常下限判断标准,在此基础上分析了区内土壤氡分布特征。研究表明:土壤氡高值分布对隐伏断裂位置和地热异常具有较好的指示意义。

The application of soil radon measurement technology to geothermal exploration in Taxkorgan county,Xinjiang

Soil radon measurement technology is an effective means for geothermal exploration, and its purpose is to determine the bur-ied faults and the geothermal fluid accumulation area. 1 904 groups of data were collected through measuring soil radon in the study area and by means of point-network control and profile-linear tracing. According to the sources of different loose layers, the authors ana-lyzed the data using the partition and piecewise methods, and discovered significant difference in soil radon in different layers. The soil radon background value is 392.1 Bq/m3 in the metamorphic clastic accumulation, 1 930.2 Bq/m3 in the granite debris, and 1 571.1 Bq/m3 in the syenite and granite melange. The dispersion degree of the data was calculated and the anomaly threshold was determined. And on such a basis, the characteristics of soil radon distribution were analyzed. It is shown that the high value anomaly of soil radon can better indicate the locations of buried faults and geothermal anomalous zones.