物化探方法在隐伏活动断裂探测中综合研究——以安宁河秧财沟断裂为例

Comprehensive study of geophysical and geochemical methods in detecting buried active faults:taking the Yangcaigou fault in Anning River as an example

利用地球物理方法寻找隐伏活动断裂,是解决工程地质问题的重要方法手段之一.本文在综合分析、研究了隐伏活动断层物化探技术方法的基础上,优选高密度电阻率法、大地电磁测深和氡气测量等3种综合物化探方法技术组合,结合地质、钻探资料进行综合处理与解释,准确地对安宁河东支秧财沟隐伏活动断裂进行定位.物化探方法技术组合综合解释推断的结果与钻孔实际情况基本吻合,证明该方法组合能经济、快速、有效地确定隐伏活动断裂位置、深度和产状,为后期工程地质勘察提供技术支撑.本文首次提出安宁河东支断裂的地球物理勘探模式,为后期开展相关工作提供技术支撑.

It is one of the important methods to solve engineering geological problems to find buried active faults by geophysical methods.In this paper,Based on the comprehensive analysis and study of the geophysical and geochemical methods of concealed active faults,Three comprehensive geophysical and geochemical exploration methods,including high density resistivity method,magnetotelluric sounding and radon measurement,are optimized.Combined with geological and drilling data,the buried active fault of Yangcaigou in the East Branch of Anning River is located accurately.The results of comprehensive interpretation and inference of geophysical and geochemical methods are basically consistent with the actual situation of boreholes,which proves that the combination of geophysical and geochemical methods can determine the location,depth and occurrence of buried active faults economically,rapidly and effectively,and provide technical support for later engineering geological investigation.In this paper,the geophysical exploration model of the East branch fault of the Anning River is put forward for the first time,which provides technical support for the later work.