大地电磁测深方法在商丘南部隐伏断裂探测中的应用

Application of the magnetotelluric sounding method in the detection of concealed faults in the south of Shangqiu

为查明商丘市南部发育的2条断层——路河断层与商丘南断层的深部构造背景,在商丘市南部路河附近布设一条大地电磁测深测线,采用远参考数据观测与处理技术,获得地下电性结构,并对探测剖面深度5.5 km以上的电性剖面与地质剖面进行分析。结果表明,商丘南部的2条断层为倾向相对的正断层,南支规模较小,北支略大,均错断太古界,有向深部汇聚到主断裂的趋势,在太康隆起北部形成小型地堑。本研究结果可为商丘南部地震构造背景的相关研究提供参考。

In order to find out the deep structural background of the Luhe fault and south Shangqiu fault in the south of Shangqiu City,a magnetotelluric sounding profile is set up near Luhe in the south of Shangqiu City.By using remote reference data observation and processing technology,the underground electrical structure is obtained,and the electrical profile and geological profile above 5.5 km are analyzed.The results show that the two faults in the south of Shangqiu are two normal faults with relative tendency.The south Branch is smaller and the north branch is slightly larger,both of which are faulted in the Archean.The two faults tend to converge to the main fault in deep,forming a small graben in the north of Taikang uplift.The research results provide a basis for the seismic tectonic background in the south of Shangqiu.