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For the geological disposal of high level radioactive waste, the repository boundary of fault zone may be an important channel for radionuclide migration to the biosphere. However, there are many problems in the field, such as the large area, complex geological body and limited drilling arrangement. In order to confirm the reasonable delineation of key exploration areas and the suitability of the disposal area, this paper is aimed at the influence of boundary faults on the footwall of the key preselected area, two lines are arranged in parallel and perpendicular to the fault respectively in Xichang block, try to use electrical resistivity tomography to detect F31 fault zone by reverse modeling, through preliminary interpretation of apparent resistivity, there is a large low resistivity zone along the fault zone, which shows that the larger rock mass is more broken, it may be caused by the thrust of the north to the south, experience weathering in the later stage, etc. can be used as the key point of drilling, the vertical line of the fault zone can reflect the fault core and the geophysical prospecting information of influence zone better, the detection information shows that the fault tendency is about 70 degrees and the thickness of fault core is about 1m, the width of the shattered zone of the fault footwall is no more than 100m, corresponding to the results of geological exploration, comprehensive analysis of combined with other geophysical prospecting methods. It is proved that the method is of guiding significance for the subsequent drilling of the fault zone and the selection of the excavation position in the laboratory.

Fault Zone Preliminary Identification Study in Xinchang Block Based on Electrical Resistivity Tomography