Application of high density resistivity method to exploring buried faults in Xigazê region of Xizang

This paper introduces the application of high density resistivity method in detail to the exploration of buried faults in Xigazê region of Xizang for the first time. The resistivity imaging from the survey lines across the Xietongmen-Qingdu fault show that the resistivity anomalies of the faults are clear and the fault up-breakpoint may reach 20--30 meters which is more shallow than the result that the up-break point reaches 50 meters from seismic reflection survey. Combined with the strata age data, the latest active time of the faults is deduced to be Early-Middle Pleistocene. In addition, the extension of the fault in shallow loose bed is displayed clearly in resistivity imaging, and thus the high density resistivity method is suitable for detecting of buried faults in Xigazê region. Comparing with shallow seismic exploration, the high density resistivity method has an advantage in exploration of shallow loose deposits and displays more effectively fault up-breakpoint on some conditions. However, it is necessary to fully aware of influence of hydrogeololgy and stratigraphic development on exploration in surveyed area.